Abstract
Worldwide use of ordinary cement concrete (OCC) faced with permeability problems causing significantly negative influence on construction and infrastructure, shortening the lifespan and increasing the related maintenance fee. To overcome these weaknesses, this paper focused on the improvement of OCC impermeability by combining a newly designed compound admixture consisting of four kinds of chemical admixtures including filling agent (F), water reducing agent (WR), fluorosilicate based agent (FB), and expansion agent (E) into the fresh concrete. Subsequent impermeable investigations showed that as adding average 3.75% compound admixture into C30 and C40 OCC, the external hydraulic water intrusion results decreased 30% and 18% respectively, chloride ion invasion number decreased 27% and 38% separately, the maximum water absorption decreased 57% and 55% meanwhile reaching saturated status obviously earlier. With evident impermeability improvement effect and partially strength loss, well-predesigned strength offsetting and appropriate fly ash combining dosage are suggested to generate remarkable workability in practical application.
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