Experimental Study on Working and Mechanical Properties of Geopolymer Modified Clay

In order to promote the implementation of China's "carbon peak in 2030, carbon neutrality in 2060" strategic goals and promote the construction industry towards the direction of low-carbon, energy saving and environmental protection, it is urgent to develop green energy saving and ecological environmental protection curing agent that can effectively replace cement/lime for residue treatment. Geopolymers are considered to be ideal substitutes for traditional curing agents. In order to study the work and mechanical properties of geopolymer modified clay, the slump and initial setting time of geopolymer modified clay were studied, and the effect of geopolymer content on the mechanical properties of geopolymer modified clay was studied. The results show that: (1) When the water content is 12.5%, slump performance is the best; (2) When the content of retarder is 2.3%, the initial setting time of the material meets the requirements, and when the content of retarder is more than 2.3%, the retarding effect is not significantly enhanced after increasing the content of retarder. (3) Geopolymer can significantly improve the compressive strength of clay. When the content of geopolymer in clay is 50%, the compressive strength of geopolymer modified clay is the best. The compressive strength of geopolymer clay was higher in the early stage and decreased slightly in the later stage. The research results in this paper can provide a theoretical basis for the application of geopolymer modified clay.