Offshore sand for reinforced concrete
Offshore sand for reinforced concrete
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DOI：
10.1016/j.conbuildmat.2007.04.006
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发表时间：
2008-07
影响因子：
7.4
通讯作者：
W. Dias;G. Seneviratne;S. Nanayakkara
中科院分区：
文献类型：
--
作者：
W. Dias;G. Seneviratne;S. Nanayakkara
对于OPC基钢筋混凝土，海上砂中允许的Cl −离子含量的安全限值为砂重量的0.075%。制作了一个2m高的砂柱，用于检查自然排水和模拟降雨对近海砂中氯化物水平的影响，发现即使是80mm的降雨也会将Cl −含量降低到可接受的水平以下。20级混凝土（即最关键的结构等级）的加速腐蚀性能是令人满意的，与无氯对照混合物相似;另一方面，与海水饱和砂（0.3%Cl −）的混合物显示出明显的高腐蚀性。
A figure of 0.075% by weight of sand was arrived at as a safe limit for allowable Cl−ion content in offshore sand for OPC based reinforced concrete. A 2m high sand column was fabricated for checking the effects of natural drainage and simulated rain on the chloride levels in offshore sand, and the action of even 80mm of rain was found to reduce Cl−contents to below acceptable levels. The accelerated corrosion performance of grade 20 concrete (i.e. the most critical structural grade) with the allowable Cl−content in the sand was satisfactory and similar to a chloride free control mix; on the other hand, a mix with seawater saturated sand (0.3% Cl−) showed clear evidence of high corrosion.