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- 저자 : J. Alexandre Bogas (검색결과 1 건)
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J. Alexandre Bogas,Rita Nogueira 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
In this paper the tensile strength of Lightweight Aggregate Concrete (LWAC) produced with different types of expanded clayaggregates is characterized. A comprehensive experimental study was carried out on different concrete compositions with meancompressive strengths from 30 to 70 MPa and density classes from D1.6 to D2.0. The influence on the splitting tensile strength andmodulus of rupture of the curing conditions and initial wetting of lightweight aggregate is studied. For concretes of equivalentcompressive strength, the tensile strength is almost independent of the type of lightweight aggregate. The tensile strength of LWACwas about 0.8-0.85 of that of Normal Weight Concrete (NWC) of equal strength, decreasing to about 0.7 in LWAC with lightweightsand. Contrary to compressive strength, the LWAC with less porous aggregates has lower tensile structural efficiency than NWC. Butthe tensile structural efficiency of moist-cured concrete is little affected by the volume and wetting conditions of aggregate. There is areduction in the splitting strength of air-cured concrete that is not predicted in the normalization and it is greater for NWC than forLWAC. However, the modulus of rupture of air-cured LWAC can only be about 0.5-0.8 of that of NWC of equal strength.
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