Study Of High-performance Hybrid Cement Concrete

High Performance Concrete is the main development direction of concrete. It is very important to define the conception of "high performance" and to study how to enhance the properties of high performance concrete for us. Two kinds of new hybrid addition materials are introduced here, one is metakaolin,a newly artificial pozzolanic mineral, and, the other is styrene-butadiene latex, a kind of polymer material. Both of the two kinds of hybrid cement concrete realized the conception of "high performance". The main research contents and the result of the study in this article are generalized as the following:First, calcining temperature is studied by the method of comparing the compressive strength of hybrid cement mortar and the comparative sample. The calcining temperature producing the active state is in 750℃ as the result of the test. And the metakaolin used in all test was calcined in 750℃.And then,by means of two advanced test methods, XRD and SEM, microstructure of the hybrid cement paste and the aggregate-paste interfacial zone are researched. Test shows that the microstructure of the hybrid cement paste and the aggregate-paste interfacial zone are improved in different extent. The result of this part is also a foundation of the following researches.Later on, part of the properties of hybrid cement concrete are researched. It shows that metakaolin hybrid cement concrete can improve durability, increase mechanical strength, especially compressive strength. While compressive strength is reduced in styrene-butadiene latex hybrid cement concrete,but the durability,toughness and workability are greatly improved then.Each of the two kinds of hybrid cement concrete has its superiority, and each of them can be used to fulfill the different requirements, and them will have the extensive engineering application perspective.