PENETRATION RESISTANCE OF CHLORIDE ION OF ULTRA HIGH STRENGTH CONCRETE WITH ROOF TILE WASTE AGGREGATE

Abstract eng:
Use of ultra high strength concrete (UHSC) is effective in improving durability of concrete structures which should lead to establishment of sustainable society. However, significant autogenous shrinkage develops in UHSC which results in higher risk of cracking. Authors reported that combination use of roof tile waste - coarse aggregate (PCCA) as an internal curing material, expansive additive (EX) and shrinkage reducing agent (SRA) is significantly effective in reducing autogenous shrinkage and resultant shrinkage stress as well as improving compressive strength of concrete. The present study aims at investigating the penetration of chloride ion into UHSC with water to binder ratio (W/B) of 0.15. The UHSC was made of low heat Portland cement premixed with silica fume by 10 %. In addition to conventional concrete (NC) with W/B of 0.35, three types of UHSC containing PCCA+EX+SRA, EX+SRA and no admixtures were prepared, in which coarse aggregate was replaced with PCCA by 20 % in volume. Non-steady penetration test was carried out by using the electrophoresis method and its result showed that the penetration rate of chloride ion of UHSC was 1/14 of NC and the diffusion coefficient of the former was 1/20 of the latter.

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