Effect of Double Blending of SAP and Polypropylene Fibres on the Compressive Strength and Impermeability of Concrete
Leakage of concrete main structure of underground projects such as tunnels is a common quality problem,which seriously affects the safety,normal use of the structure and durability,so the seepage resistance of concrete has become the focus of research in the construction industry.Double mixing SAP and polypropylene fibers to improve the seepage resistance of concrete,in the concrete were mixed into the mass ratio of 0.1%,0.3%,0.5%of the SAP cementitious materials,and at the same time,respectively,1,2,3kg/m3 of polypropylene fibers,compression and seepage resistance test.The results show that:single mixing SAP 0.1%～0.3%almost does not affect the compressive strength of concrete,but the mixing amount of 0.5%,the compressive strength will be significantly reduced;double mixing SAP 0.1%and polypropylene fibers 0～2kg/m3 can slightly improve the compressive strength,and significantly improve its impermeability;after comparison,mixing SAP 0.1%～0.3%and polypropylene fibers 0～2kg/m3,can ensure the compressive strength of concrete,and can ensure the compressive strength of concrete.can ensure the compressive strength of concrete,improve the impermeability performance,and effectively reduce the risk of water seepage of concrete.
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