Effects and mechanism of SAP on the basic properties of prefabricated building grout
Aiming at the problem that the prefabricated building grout cannot be cured after grouting due to the closed working environment,SAP is used as the internal curing agent of the grouting material.The influence of SAP content on the fluidity and mechanical properties of the grouting material under different water-binder ratios is studied,and the pore structure and micro morphology of the grouting material are analyzed,and the influence mechanism of SAP on the workability and mechanical properties of the grouting material is discussed.The feasibility of using SAP as curing agent in grout material is analyzed.The results show that:at the same water-binder ratio,the fluidity of grouting material decreases linearly with the increase of SAP content.and the smaller water-binder ratio is,the greater the reduction is;In standard curing condition,the peak compressive strength of grout decreases with the increase of SAP content,in the outdoor curing condition,SAP can play the role of internal curing more fully;The results of MIP test show that SAP can reduce the most probable pore size,increase the number of harmless pores,while the numbers of harmful and multiple harmful pores also increase;The SEM results show that SAP reduce the cracks in the grout microstructure,but left pores in the matrix.In general,SAP can improve the uniformity of grouting material by absorbing excess mixing water,and gradually release water to promote cement hydration and improve the strength of grouting material.It is a good curing material in prefabricated building grout.
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