生物基减水剂对水泥水化进程影响及减水机理

Influence of the Novel Bio superplasticizer on Cement Hydration Processand Its Water Reducing Mechanism

关键词:  玉米化工醇釜残物  生物基减水剂  水化进程  作用机理

Key words:  corn polyols residue(CPR)  bio superplasticizer  hydration process  function mechanism

摘要:

将玉米化工醇釜残物开发为新型的生物基减水剂，采用傅里叶变换红外光谱（FTIR）对其进行表征.结合X射线衍射（XRD）图谱分析和扫描电镜（SEM）研究生物基减水剂对水泥水化产物生成和微观形貌的影响，进一步从ζ 电位、减水率、凝结时间和抗压强度分析

Abstract:

A novel bio superplasticizer with corn polyols residue(CPR) was proposed and characterized by Fourier transform infrared spectroscopy(FTIR). Combined with X ray diffraction intensity(XRD) analysis and scanning electron microscope(SEM), the effects of bio superplasticizer on development and morphology of cement hydration products were investigated, and further the hydration process and regulation mechanism were analyzed. Moreover, function mechanism of bio superplasticizer was discussed. The result indicates that the early hydration of cement is retarded by bio superplasticizer where ether bond and sulfonic acid groups are introduced, however,the late cement hydration can be promoted, and the dispersion ability of corn polyols residue based plasticizer(CPRP) in cement paste is better. In addition, the initial setting and final set time of cement paste admixed with bio superplasticizer extends for 92 and 110 min, respectively as compared to the control; the water reducing ratio of cement attained to 24.3%(by mass), but it does not affect the development of compressive strength of the hardened cement paste, compressive strength of 28d is 42.7 MPa. Bio superplasticizer improves the mechanical properties and durability of hardening cement paste.