Study on the Influence of Chlorite in Aggregate Parent Rock on the Performance of Hydraulic Concrete
The influence of clay mineral chlorite in aggregate parent rock on the performance of concrete can not be ig-nored.Five kinds of parent rock with different chlorite content were crushed into aggregate concrete,and the influence of chlorite content on the working performance,mechanical properties,durability and volume deformation of concrete was studied.The results show that with the increase of chlorite content,the slump of concrete decreases and the time loss in-creases.Chlorite has a significant effect on the content of polycarboxylate superplasticizer.When the content exceeds 6.3%,the content of superplasticizer increases greatly.The compressive strength,axial tensile strength and static pres-sure elastic modulus of concrete decrease with the increase of chlorite content,and the higher the chlorite content is,the greater the decrease.The decrease of axial tensile strength of concrete in the same group is greater than that of compres-sive strength,and the decrease of early strength is greater than that of later strength.The frost resistance and impermea-bility of concrete decrease with the increase of chlorite content.When the content exceeds 9.8%,the frost resistance of concrete deteriorates obviously.With the increase of chlorite content,the dry shrinkage/wet expansion deformation and compressive creep of concrete increase,and the higher the content is,the greater the increases.The research results can provide reference for the design of hydraulic concrete mix proportion.
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维普
