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首页> 外文会议>The 5th International Symposium on Cement and Concrete Vol.2 Oct 28-Nov 1, 2002 Shanghai, China >INVESTIGATIONS INTO THE EFFECTS OF CONCRETE ADDITIVE AGENTS AND MINERAL ADMIXTURES ON SULFURIC ACID AND SULFATES ATTACKS AND THE TEST METHOD
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INVESTIGATIONS INTO THE EFFECTS OF CONCRETE ADDITIVE AGENTS AND MINERAL ADMIXTURES ON SULFURIC ACID AND SULFATES ATTACKS AND THE TEST METHOD

机译：混凝土添加剂和矿物质添加剂对硫酸和硫酸盐攻击的影响及试验方法

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摘要

To investigate the effects of concrete additive agents and mineral admixtures on sulfuric acid and sulfate attacks, a series of mortar bar immersion test was carried out respectively in sulfuric acid and sulfates solutions for more than two years. Some concrete additive agents and mineral admixtures used in common such as expanding agent, high-range water-reducer, condensed silica fume, pulverized fly ash, and so on, were employed with different replacement level in different series of mortar bar spec-imens prepared for the test. A modified test method based on Chinese standard GB2420-81 and GB749-65, in which the deterioration resistant coefficient defined by a ratio of flexure strength was as the crite rion of concrete deterioration resistant, was used in this work. The results showed that all the above mentioned concrete additive agent and mineral admixtures had remarkable effects on sulfuric acid and sulfates attacks expect high-range water-reducer which had effects just in early stage. The deterioraton resistant coefficient K' could evaluate objectively the sulfates resistance of cement and concrete and their admixtures when the datum strength was the flexural strength F_w' of mortars made from OPC cured in water for 28d.
机译：为了研究混凝土添加剂和矿物掺合料对硫酸和硫酸盐侵蚀的影响，分别在硫酸和硫酸盐溶液中进行了两年以上的灰浆杆浸没试验。在配制的不同系列的砂浆棒料中，使用了一些常用的混凝土添加剂和矿物掺合料，如膨胀剂，高水减水剂，浓缩硅粉，粉煤灰等，并以不同的取代水平使用。进行测试。在这项工作中，使用了基于中国标准GB2420-81和GB749-65的改进试验方法，其中以抗弯强度比定义的抗劣化系数作为混凝土抗劣化的标准。结果表明，以上提到的所有混凝土添加剂和矿物掺合料对硫酸和硫酸盐的侵蚀都有显着影响，预计高范围减水剂将在早期发挥作用。当基准强度为在水中固化28d的OPC制成的砂浆的抗折强度F_w'时，抗劣化性系数K'可以客观地评估水泥和混凝土及其掺合料的抗硫酸盐性。

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