Accelerated Test for Measuring Sulfate Resistance of Calcium Sulfoaluminate, Calcium Aluminate, and Portland Cements
Accelerated Test for Measuring Sulfate Resistance of Calcium Sulfoaluminate, Calcium Aluminate, and Portland Cements
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DOI：
10.1061/(asce)0899-1561(2001)13:3(216
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发表时间：
2001-06
影响因子：
3.2
通讯作者：
K. Kurtis;K. Shomglin;P. Monteiro;J. Harvey;J. Roesler
中科院分区：
文献类型：
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作者：
K. Kurtis;K. Shomglin;P. Monteiro;J. Harvey;J. Roesler
已知土壤、地下水、海水、腐烂有机物和工业废水中存在的硫酸根离子会对混凝土的长期耐久性产生不利影响。然而，美国测试与材料协会 (ASTM) 用于预测硫酸盐抗性的测试方法因未能充分预测现场性能而受到批评。在本次调查中，通过加速测试方法对水泥浆进行了测试，其中 pH 值和硫酸盐浓度保持恒定，这些条件更能代表现场条件。总共测试了八种水泥：三种波特兰水泥（I/II 型、III 型和 V 型）；一种铝酸钙水泥（CA1）；两种硫铝酸钙水泥（CSA1 和 CSA2）；以及两种含有铝酸钙、硬石膏和波特兰水泥的混合物（CAPC1 和 CAPC2）。暴露于 pH 值保持在 7.2 的 4% Na2SO4 溶液中 63 天后，水泥的抗硫酸盐性能可描述为： CA1 = CSA2 = Type I/II > Type V > Type III > CAPC2 > CAPC1 > CSA1。
Sulfate ions present in soil, ground water, seawater, decaying organic matter, and industrial effluents are known to have an adverse effect on long-term durability of concrete. However, American Society for Testing and Materials (ASTM) test methods for predicting sulfate resistance have been criticized for failing to adequately predict field performance. In this investigation, cement pastes were tested by an accelerated test method where pH and sulfate concentration remained constant, conditions that are more representative of field conditions. A total of eight cements were tested: three portland cements (Type I/II, Type III, and Type V); one calcium aluminate cement (CA1); two calcium sulfoaluminate cements (CSA1 and CSA2); and two blends containing calcium aluminate, anhydrite, and portland cement (CAPC1 and CAPC2). After 63 days of exposure to a 4% Na₂SO₄ solution where the pH was maintained at 7.2, sulfate resistance of the cements can be described by: CA1 = CSA2 = Type I/II > Type V > Type III > CAPC2 > CAPC1 > CSA1.