改性微生物泡沫剂及其在泡沫混凝土中的应用

Modification of Microbial Foam Agent and Their Application in Foam Concrete

摘要:

针对微生物泡沫剂发泡倍数低、泡沫尺寸不均匀及泡沫稳定性差等问题，采用阳离子型表面活性剂（十六烷基三甲基溴化铵，CTMAB）、阴离子型表面活性剂（十二烷基磺酸钠，CAS）和两性离子型表面活性剂（椰油酰胺基丙基甜菜碱，CAB）对其进行改性，探究表面活性剂类型及掺量对微生物泡沫剂发泡倍数和泡沫性质的影响，并研究了所制备的A06泡沫混凝土的物理力学性能及微观孔隙结构.结果表明：CAB对微生物泡沫剂性能的改善效果最佳，在最佳掺量5.0%下，微生物泡沫剂发泡倍数达32、泡沫1 h沉降距为5 mm、1 h泌水率为62.96%，泡沫尺寸小且均匀；所制备的A06泡沫混凝土28 d抗压强度达到3.45 MPa，高于行业标准要求.

Abstract:

To address challenges related to the low foaming ratio， uneven foam size， and poor foam stability of microbial foam agents， cationic surfactant （cetyltrimethylammonium bromide， CTMAB）， anionic surfactant （sodium dodecylsulfonate， CAS）， and zwitterionic surfactant （coconut amidopropyl betaine， CAB） were used to modify the microbial foaming agent. The objective was to investigate the impact of surfactant type and dosage on the foaming ratio and foam properties of the microbial foam agent， as well as explore the influence of zwitterionic surfactant-modified microbial foam agent on the physical， mechanical properties， and micro pore structure of A06 foam concrete. The results show that the surfactant CAB exhibites the most significant enhancement in the performance of the foam agent compares to the other two surfactants， with the optimal dosage identifies as 5%. At this concentration， the foaming ratio of the microbial foam agent is 32. Moreover， the 1 h sedimentation of foam is 5 mm， and 1 h bleeding rate of the foam is 62.96%， respectively. The resulting foam exhibites small and uniform size. The compressive strength of the prepared A06 foam concrete reaches 3.45 MPa， surpassing industrial standard requirements.