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    • 1  Preparation of Powder Polycarboxylate Superplasticizer
    麻秀星 ,  钱觉时 ,  李苑 ,  邓成 ,  方云辉
    2011(6):829-833. DOI: 10.3969/j.issn.10079629.2011.06.021
    [Abstract](3904) [HTML](0) [PDF 1.07 M](6269)
    Abstract:
    The preparation of powder polycarboxylate superplasticizer by centrifugal spray drying process was discussed. The powder solid content(by mass) of the product can reach 99%. Through infrared spectroscopy the carbonyl group has been shown to be partly decomposed during the drying process which has only limited influence on the performance of the powder with the result that its performance is at the same level compared to the liquid superplasticizer. Based on single factor experiments, the major parameters affecting the drying process were discussed and the appropriate process conditions were obtained, e.g. the import air temperature of drying chamber must be controlled at 180220℃；the spraydrying feed temperature controlled at 2040℃, and solid content of polycarboxylate superplasticizer fed is in the range of 20% to 60%.
    2  Comparative Study on Anti-aging Performance of Asphalt Based on Dynamic Aging Process
    ji xiao ping ,  hou yue qin ,  xu hui ,  zheng nan xiang ,  tan xue zhang
    2013(2).
    [Abstract](3220) [HTML](0) [PDF 0.00 Byte](5498)
    Abstract:
    The purpose of this paper is to use dynamic characterization model to evaluate the dynamic process of asphalt aging and compare the pros and cons of different asphalt. First, the RTFOT aging tests at different aging time for four kinds of asphalt are carried out and the aging test data are fitted with dynamic characterization model. As a result, the aging parameters and aging equation of penetration, ductility, softening point and viscosity of different asphalt are determined. Then, grey relational evaluation method is used to evaluate the anti-aging performance of different asphalt, which setting the aging parameters L and r of penetration, ductility, softening point and viscosity as the evaluation indexes. The results show that: the aging rate of penetration, softening point, ductility of asphalt reaches the peak at the beginning and becomes smaller as the variation of aging time and balances at last; The aging process of asphalt can be described accurately by dynamic characterization mode and parameters L and r can be a good characterization of aging degree and aging rate; The sort of anti-aging properties of the four asphalt is determined as following: the indoor modified asphalt is better than matrix 90 asphalt and better than SBS modified asphalt and better than matrix 70 asphalt.
    3  Mix Design of Manufactured Aggregate Concrete According to Performance Requirements
    WU Chaoming ,  LI Chunjin ,  HU Kun ,  WU Chenghang ,  REN Qiang
    2024, 27(8):667-674. DOI: 10.3969/j.issn.1007-9629.2024.08.001
    [Abstract](415) [HTML](107) [PDF 0.00 Byte](5391)
    Abstract:
    The mix design of manufactured aggregate was proposed based on the Dinger-Funk grading model. The mass relationship between binder and water for concrete with manufactured aggregate was determined by modifying the Bolomey’s formula. The paste thickness was introduced to establish the volume relationship between aggregate and paste. In addition， the stone powder in manufactured sand was considered as a component of the paste. Finally， the mix design method of concrete with manufactured sand was proposed and verified with concrete of different strength grades. The results show that the workability of concrete can be regulated by the paste thickness. The compressive strength of concrete and the diffusion coefficient of chloride have no obvious correlation with the paste thickness， with the water to binder ratio being the main factor regulating the hardened performance of concrete. The proposed mix design method can be used to quantitatively design concrete with manufactured aggregate for various performance requirements.
    4  Development of Shrinkage and Internal Moisture in Cement Paste, Mortar and Concrete at Early Age
    Zhang Jun ,  Chen Hao-Yu ,  Hou Dong-Wei
    2011(3):287-292.
    [Abstract](3873) [HTML](0) [PDF 1.47 M](5384)
    Abstract:
    The development of free deformation and internal moisture in cement paste, mortar and concrete were experimentally investigated. The results show that the deformations of cement paste, mortar and concrete at early age all exhibit plastic swelling at initial several hours after casting and then shrinking with a gradually reduced rate. The end point of swelling may be corresponding to the transformation point of plastic state to solid state and this point can be defined as setting time of the cement based materials. The development of shrinkage starting from setting point of the three kinds of cementitious materials exhibits at first a fast developing stage(stage Ⅰ) and is followed by a relatively slow developing stage(stage Ⅱ). The restraint effect of aggregates on shrinkage is significant only in the stage Ⅱ. In stage Ⅰ a similar shrinkage values are observed on the three kinds of materials. The development of moisture inside cement paste, mortar and concrete can be described as a vapor saturated stage with saturated moisture followed by a stage in that internal moisture is gradually reduced. The shrinkage developed within stage Ⅱ can well correlate to the reduction of internal moisture.
    5  Rheological Characteristics of Sodium Silicate Solution and Its Effects on the Performance of Geopolymer Slurry
    文梓芸 ,  晏锦 ,  殷素红
    2011(6):723-729. DOI: 10.3969/j.issn.10079629.2011.06.001
    [Abstract](3634) [HTML](0) [PDF 1.83 M](5361)
    Abstract:
    The effect of modulus, mass fraction and temperature of sodium silicate solution(SS) on the rheological characteristics of SS and geopolymer slurry(GS) were analyzed by means of viscometer and rheometer. Meanwhile, the effect of SS modified by ultrasonic on the workability of GS was studied. The results show that the viscosity of SS for 2.2 modulus get the minimum value in ambient temperature(1825℃), but the effect of modulus on viscosity of SS is gradually weaker with the raise of temperature. When SS is in the true solution(highionized) zone(modulus<1.8), the difference of GS viscosity of different SS modulus is little, while in the water glass(SiO2polymerized) zone(modulus>2.2), the viscosity of GS increases sharply with the increase of modulus of SS. With increasing of the mass fraction of SS, both viscosity of GS and SS are all increased.The viscosity of GS gets the minimum value at 30℃ in different SS modulus. The SS modified by ultrasonic could improve the fluidity of GS and increase the compressive strength of geopolymer.
    6  Damage Evolution of Ancient Building Blue Bricks under Freeze-Thaw Cycle Based on DIC
    HAO Yunhong ,  GAO Jiong ,  WU Rigen ,  XUAN Jiaoyu ,  HE Xiaoyan
    2024, 27(8):764-772. DOI: 10.3969/j.issn.1007-9629.2024.08.012
    [Abstract](226) [HTML](54) [PDF 0.00 Byte](5313)
    Abstract:
    Taking the ancient building wall of Longshengzhuang in Inner Mongolia as the research object， the damage and failure law of ancient building blue bricks under freeze-thaw cycles were investigated by digital image correlation（DIC） technology. Two-factor—damage degree factor and damage localization factor were used to characterize the uniaxial compression damage process of ancient building blue bricks. Based on the two-factor damage evolution curve， a damage evolution model was established under different freeze-thaw cycles. The results show that the failure process of ancient building blue bricks under uniaxial compression can be divided into four stages—initial damage closure stage， linear elastic damage stage， elastic-plastic damage stage and plastic damage stage. With the increase of freeze-thaw cycles， the strain concentration on the surface of blue brick increases， resulting in a decrease in bearing capacity. Freeze-thaw cycles will shorten the linear elastic stage in the two-factor curve. At the same time， the damage evolution model established by the two-factor can effectively reflect the damage evolution process of the ancient building blue brick material under the action of freeze-thaw cycles.
    7  Freeze-Thaw Damage of Ancient Architectural Blue Bricks Based on Fractal Theory
    WU Anli ,  LIU Kun ,  HAO Yunhong ,  WU Rigen ,  XUAN Jiaoyu
    2024, 27(8):701-710. DOI: 10.3969/j.issn.1007-9629.2024.08.005
    [Abstract](238) [HTML](72) [PDF 0.00 Byte](5310)
    Abstract:
    The apparent morphology， mass loss rate， relative dynamic elastic modulus， compressive strength and pore structure of blue bricks after freeze-thaw cycle were studied. The relationship between fractal dimension and compressive strength， porosity and frost resistance was established based on fractal theory. The results show that with the increase of freeze-thaw cycles， the small pores on the surface of the blue brick deteriorate into large pores and gradually extend into cracks， resulting in an increase in the mass loss rate， and a decrease in the relative dynamic elastic modulus and compressive strength. After freeze-thaw cycle， the internal pores of the blue brick have obvious fractal characteristics， and the fractal dimension is distributed between 2.964 2 and 2.982 7. The fractal dimension of blue brick after freeze-thaw cycle is positively correlated to compressive strength and negatively correlated to porosity， and its fractal dimension is also highly correlated with frost resistance. The fractal dimension can be used to evaluate the microscopic pore structure change of the blue brick， and can also reflect the influence of the complexity of the pore structure on the macroscopic properties of the blue brick after freeze-thaw cycle. The research results provide a basis for the protection and durability damage of ancient architectural blue bricks in cold regions.
    8  Strength Characteristics and Deformation Mechanism of Modified Sand by Using Polymers and Fibers
    HUANG Tingwei ,  LIU Jin ,  ZHU Xufen ,  CHE Wenyue ,  SUN Mengya
    2024, 27(8):744-756. DOI: 10.3969/j.issn.1007-9629.2024.08.010
    [Abstract](225) [HTML](76) [PDF 0.00 Byte](5277)
    Abstract:
    To improve the unfavorable engineering performance of sand and make it applicable for riverbank slopes， foundation， and road reinforcement， a method for modifying sand using polymers and fibers is proposed. Through unconfined compressive strength tests and numerical simulations， the strength characteristics and deformation failure modes of the modified sand are analyzed. The results indicate that the combined use of polymers and fibers can effectively enhance the compressive strength of sand， and the compressive strength of the modified sand increases with the dosage of polymers and fibers. The maximum compressive strength of the modified sand is 414.53 kPa， with the optimal recommended dosages of fibers and polymers being 0.6% and 4.0%， respectively. The addition of fibers forms a force chain network in the sand， thereby increasing the stress transmission paths and effectively delaying the development of micro-cracks within the sand. The incorporation of polymers creates a membranous substance that intertwines with the fibers， forming a new network structure， which significantly improves the deformation resistance of the sand.
    9  Effect of Molar Ratio on Mechanical Properties and Deformation Behavior of Modified Magnesium Oxysulfate Cement and Its Mechanism
    BA Mingfang ,  MA Zheyang ,  JI Luxin ,  CUI Jiaming ,  LIU Junzhe
    2024, 27(8):733-743. DOI: 10.3969/j.issn.1007-9629.2024.08.009
    [Abstract](217) [HTML](51) [PDF 0.00 Byte](5247)
    Abstract:
    The effect of the molar ratio（n（MgO）∶n（MgSO4）∶n（H2O）） in the raw materials on the mechanical properties and deformation characteristics of modified magnesium oxysulfide（MMOS） cement was studied， and the mechanism was analyzed by testing techniques， such as X-ray diffraction（XRD）， scanning electron microscope（SEM）， Fourier transform infrared spectroscopy（FTIR） and thermogravimetric analysis（TG）. The results show that the compressive strength and flexural strength of MMOS cement matrix shows an increasing trend with the increase of water-sulfur ratio and oxygen-sulfur ratio. The specimen with a molar ratio of 10∶1∶12 has the highest compressive and flexural strength. The deformation of MMOS cement specimens with different molar ratios during the period from completion of pouring to 56 days of curing is mainly expansion deformation. The total deformation of MMOS cement specimens shows a decreasing trend with the increase of water-sulfur ratio and oxygen-sulfur ratio， while the autogenous deformation shows a decreasing trend with the increase of water-sulfur ratio and a first increasing and then decreasing trend with the increase of oxygen-sulfur ratio. The MMOS cement specimens with different molar ratios exhibit differences in expansion deformation， mainly due to the different contents of hydration products Mg（OH）2， 5·1·7 phase （5Mg（OH）2·MgSO4·7H2O） and unreacted MgO phase in the hardened matrix. When the content of Mg（OH）2 decreases and the content of 5·1·7 phase increases， the expansion deformation phenomenon of MMOS cement specimens weakens， while their flexural strength and compressive strength are improved.
    10  Research on Roughness Parameters of High Strength Steel and Weld Joint in Marine Environment
    WEI Huanhuan ,  TANG Yiqun ,  ZHANG Guangcai ,  CHEN Chen
    2024, 27(8):727-732. DOI: 10.3969/j.issn.1007-9629.2024.08.008
    [Abstract](242) [HTML](55) [PDF 0.00 Byte](5241)
    Abstract:
    The surface roughness parameters of Q690 high strength steel and weld joint specimens were assessed through microscopic scanning tests to investigate the dynamic changes in corrosion morphology characteristics of high strength steel（HSS） within the ocean splash zone corrosive environment. These investigations encompassed the analysis of parameters such as the maximum height of surface peaks Sp， the maximum depth of surface valleys Sv， the skewness of surface profiles Ssk， and the kurtosis of surface profiles Sku over varying periods of corrosion. Power function regression analyses and comparative assessments were conducted for each of these parameters. The results indicate that considering the differences in the scanning area of base material and weld joint of Q690 high strength steel， the corrosion degrees and characteristics can be accurately determined by analyzing the variation process of roughness parameters with corrosion time， so as to provide a new approach for damage assessment of domestically produced high strength steel in marine environments.
    11  Anisotropy of Hardened Properties of 3D Printing Concrete and Its Dependence on Resting Time
    LI Chunjin ,  REN Qiang ,  ZHANG Yi ,  YANG Zhendong ,  JIANG Zhengwu
    2024, 27(8):675-684. DOI: 10.3969/j.issn.1007-9629.2024.08.002
    [Abstract](249) [HTML](85) [PDF 0.00 Byte](5236)
    Abstract:
    By comparing the strength and durability differences between 3D printing concrete（3DPC） and casting concrete in different test directions， the anisotropic characteristics of the hardened properties of 3DPC and its dependence on the resting time were explored. The results show that the hardened properties of 3DPC have certain anisotropy， and the mechanical properties and impermeability in the vertical direction are higher. The anisotropy of hardened properties is related to the weak bonding interface between printing layers and the distribution of pores and defects in the concrete matrix. The bonding property of interlayer interface is obviously weakened when resting time is prolonged. The durability of different printing layers of 3DPC is different， the density of the upper layer of concrete is lower， and the diffusion rate of the aggressive medium is faster.
    12  Influence and Mechanism of NO2-LDH on Effect of Superplasticizer
    JING Xue ,  SONG Xuefeng
    2024, 27(8):685-690. DOI: 10.3969/j.issn.1007-9629.2024.08.003
    [Abstract](242) [HTML](66) [PDF 0.00 Byte](5231)
    Abstract:
    Nitrite intercalation hydrotalcite（NO2-LDH） was prepared by roasting and reduction method， and its effect on adsorption， dispersion and enhancement of superplasticizer were studied. The results show that the layer spacing and crystallinity of the NO2-LDH are slightly lower than that of protocarbonate type Mg-Al hydrotalcite. There is anion exchange between NO2-LDH and superplasticizer， which reduces the adsorption and dispersion effect of superplasticizer. The decreasing degree of dispersion effect of superplasticizer increases with the increase of NO2-LDH content. NO2-LDH has no obvious effect on the flexural strength of mortar mixed with superplasticizer， but the compressive strength is slightly increased. The effect of NO2-LDH on the dispersion of naphthalene superplasticizer is greater than that of polycarboxylic acid superplasticizer.
    13  Analysis of Microstructure and Pyrolysis Process of Vulcanized Eucommia Ulmoides Gum Modified Asphalt
    CUI Shichao ,  GUO Naisheng ,  ZHANG Jun ,  CHU Zhaoyang
    2024, 27(8):720-726. DOI: 10.3969/j.issn.1007-9629.2024.08.007
    [Abstract](232) [HTML](53) [PDF 0.00 Byte](5229)
    Abstract:
    Vulcanized eucommia ulmoides gum modified asphalt（VEUGMA） was prepared by natural plant-based eucommia ulmoides gum（EUG）， and the microstructure and pyrolysis process of VEUGMA were studied. The results show that VEUGMA is of lower penetration， higher softening point， larger ductility and viscosity， better deformation resistance at high temperature and cracking resistance at low temperature than matrix asphalt. Compared to matrix asphalt， VEUGMA has larger number and smaller size of honeycomb structures， lower root mean square roughness， greater adhesion， higher pyrolysis temperature， and less CO2 and CO release. The modification effect is the best when 6% EUG and 3.5% sulfur （calculated by EUG quality） are added to the matrix asphalt.
    14  Tensile and Compressive Fatigue Characteristics and Viscoelastic Characterization of Reclaimed Asphalt Mixture
    LI Hao ,  WANG Xuancang ,  ZENG Guodong ,  FANG Yang ,  LONG Guoxin
    2024, 27(8):711-719. DOI: 10.3969/j.issn.1007-9629.2024.08.006
    [Abstract](232) [HTML](54) [PDF 0.00 Byte](5226)
    Abstract:
    Based on the mathematical characteristic analysis of the dynamic modulus principal curve of asphalt mixture， the viscoelastic evaluation system of reclaimed asphalt mixture was established， and the physical parameters of viscoelastic behavior were also proposed. The viscoelastic difference between tensile and compressive directions was compared， the fatigue characteristics of reclaimed asphalt mixture in tensile and compressive direction were studied， and the relationship between fatigue properties and viscoelastic physical properties was established. The results show that， compared with the new asphalt mixture， the reclaimed asphalt mixture is elastic rather that viscoelastic， but it is effective viscoelastic enough under compression mode， and elastic rather that viscoelastic under tensile mode. Under the same loading mode （whether compressive or tensile）， only the viscoelastic physical property parameter Reve has a high linear correlation with fatigue life Nf. When the loading mode is different， the linear relationship between Reve and Nf can not be established.
    15  Experimental Study on Solidification/Stabilization of Leachate Sludge by Cement and MSWI Fly Ash
    LIANG Shihua ,  WANG Jie ,  WANG Yuxin ,  FENG Deluan
    2024, 27(8):691-700. DOI: 10.3969/j.issn.1007-9629.2024.08.004
    [Abstract](244) [HTML](52) [PDF 0.00 Byte](5204)
    Abstract:
    Leachate sludge was solidified by using sulphoaluminate cement（SAC） and municipal solid waste incineration fly ash as cementitious materials. The composite curing effect and curing mechanism of cement and fly ash were explored through an unconfined compressive strength test， leaching toxicity analysis and microscopic test. The results show that when the cement content is not less than 20%， 28 d unconfined compressive strength of the cement solidified sample meets the landfill strength requirements. Fly ash is an excellent auxiliary curing agent for cement solidified leachate sludge， and its enhancement effect on the unconfined compressive strength of cement solidified samples has an optimal dosage. 10% fly ash can replace 10% cement to achieve a better curing effect. The samples with 30% or 40% cement + 15% fly ash can meet the requirements of landfill strength and leaching toxicity at the same time.
    16  Influence of Eextreme Wet-Heat Environment on Adhesive Bonding Performance of CFRP/steel Interfaces
    LI Chuanxi ,  SIDU Yinghu ,  GAO Youwei
    2024, 27(8):757-763. DOI: 10.3969/j.issn.1007-9629.2024.08.011
    [Abstract](212) [HTML](57) [PDF 0.00 Byte](5202)
    Abstract:
    To understand the deterioration mechanism of CFRP/steel interface properties under extreme hot and humid environment， 12 of CFRP/steel double lap specimens using Sika-30 adhesive were prepared. These specimens were immersed in simulated seawater at 70 ℃ for different time for tensile shear test. The results show that the failure mode of these specimens were less affected by the soaking time. The average shear strength of the CFRP/steel interfaces increased first and then decreased with the soaking time. After soaking for 90 days， the average shear strength of the CFRP/steel interfaces decreased by 35.6% compared with that of unsoaked specimen.
    17  Preparation of Sulphoaluminate Cement from Municipal Solid Waste Incineration Fly Ash and Its Hydration Properties
    施惠生 ,  吴凯 ,  郭晓潞 ,  邓恺 ,  R.TRETTIN ,  张震
    2011(6):730-736. DOI: 10.3969/j.issn.10079629.2011.06.002
    [Abstract](3954) [HTML](0) [PDF 1.19 M](4830)
    Abstract:
    Municipal solid waste incinerator(MSWI) fly ash was successfully used as a raw material in sintering sulphoaluminate cement clinker in the laboratory. The clinkerization process, morphology and compositions of the clinker were investigated. The hydration properties of sulphoaluminate cement and the toxicity leaching characteristics of heavy metals were also studied. The results show that the good quality clinkers in which C4A3S and C2S are presented as major phases can be sintered by using the MSWI fly ash as raw material, and the optimal amount of MSWI fly ash in the raw mix is about 30%. Microstructure of produced clinker was loose and lacunary and it appeared to be irregulartiny crystal. The sulphoaluminate cement with reasonable strength can be prepared by grinding the clinker with appropriate amount of gypsum. Porosity and mean pore diameter of harden cement paste decrease with the curing age. The results also indicate that the concentrations of all the investigated elements in the leachates are far below the regulatory limit up to 28 d, and the produced cements would not present a leaching hazard to environment.
    18  Effect of Basalt Fiber Surface Modification on Mechanical Properties of Concrete
    DU Changbo ,  ZHU Minghao ,  YI Fu ,  TAO Han ,  SUN Di
    2024, 27(7):573-579. DOI: 10.3969/j.issn.1007-9629.2024.07.001
    [Abstract](350) [HTML](72) [PDF 0.00 Byte](4709)
    Abstract:
    Basalt fiber（BF） was modified by coupling agent（KH550） and nano-SiO2， and the effect of BF surface modification on the mechanical properties of basalt fiber reinforced concrete（BFRC） was studied. The results show that after modification with KH550 and nano-SiO2， the surface of BF forms C—H bonds， and the vibration peak corresponding to Si—O—Si bonds becomes stronger. When the amount of nano-SiO2 is 3% of the mass of BF， the morphology of BF changes most significantly， and the mechanical strength and crack resistance of modified BFRC are significantly higher than those of ordinary BFRC. Under the bridging effect of KH550， nano-SiO2 can effectively enhance the bonding strength between fibers and the concrete matrix， thereby improving the mechanical strength and crack resistance of BFRC
    19  Effect of Composite Expansive Agent on Early-Age Expansion Properties of Cementitious Grouting Material for Wind Power Project
    HAN Yudong ,  XIE Yue ,  YUE Qingrui ,  YANG Feng ,  DING Zhenyue
    2024, 27(7):611-619. DOI: 10.3969/j.issn.1007-9629.2024.07.006
    [Abstract](219) [HTML](48) [PDF 0.00 Byte](4594)
    Abstract:
    Based on an improved vertical expansion rate（εv） testing method， the development of εv of high-strength cementitious grouting material for wind power project within 0-24 hours and 1-7 days was obtained. The effects of the proportions of mineral admixtures as well as expansive agents on εv， fluidity and mechanical strength of grouting material were experimentally investigated. Results show that a typical developing characteristic with “four stages” is observed in the curves of εv-time of grouting material during 0-24 hours. With the increase of silica fume percentage in the range of 0%-20%， the fluidity of grouting material decreases gradually， and the peak value of εv firstly increases and then decreases from casting to 24 hours. Plastic expansive agent（PEA） dominants the development of εv within 24 hours. Furthermore， calcium sulphoaluminate-calcium oxide expansive agent（HP-CSA） is added， the peak value of εv decreases， the 24 h-value decreases， and the 3 h-value increases， which is beneficial to the control of the difference between the 24 h-value and 3 h-value. During the age of 1-7 days， the expansive efficiency of HP-CSA can well be promoted by PEA with addition of 0.03%. And the vertical autogenous shrinkage can generally be “compensated” by HP-CSA with the addition percentage not less than 6%， resulting in a grouting material with a net expansion during the period either 0-24 hours or 1-7 days. Relay effect in time and synergistic effect in outcome on expansion regulation for the grouting material are observed when PEA and HP-CSA composite are used， and if an appropriate dosage is found， a fine regulation on εv is well achieved in stages within 7 days. In addition， with the increase of the composite expansive agent， the initial and 30 mins values of fluidity of the grouting material shows little change， and the compressive strength at 28 days first increases and then decreases. Within the scope of this study， PEA at 0.06% and HP-CSA at 6% is comprehensively the optimal dosage composite.
    20  Effect of Chemical Modification on High-Temperature Properties of Mineral Adsorbents
    ZHU Huimei ,  SUN Xiao ,  MA Yuqing ,  LI Hui
    2024, 27(7):604-610. DOI: 10.3969/j.issn.1007-9629.2024.07.005
    [Abstract](196) [HTML](53) [PDF 0.00 Byte](4573)
    Abstract:
    Modified mineral adsorbents were prepared by changing the content of silicon oxide， alumina oxide， and calcium oxide in kaolin. The mass， morphology and phase transformation of the modified mineral absorbents were analyzed at 900-1 450 ℃. The results show that amorphous aluminosilicates are the main component of mineral adsorbents at 900 ℃. At 1 200 ℃， amorphous aluminosilicates transform into mullite and cristobalite. Increasing silicon oxide content inhibits this transformation， while increasing alumina content decomposes into corundum phase and improves the chemical stability of the adsorbent. Calcium oxide reacts with active silicon aluminum to form calcium feldspar. When the temperature exceeds 1 200 ℃， an appropriate increase in silicon oxide content can reduce the melting sintering of mineral adsorbents and reduce the release of Pb. However， increasing alumina oxide and calcium oxide contents eliminate and intensify the melting sintering of mineral adsorbents， and has little effect on the release of Pb. The research can provide guidance for improving the solidification of heavy metals in the collaborative disposal of cement kilns.

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