Evaluation of Sulfate Resistance of Portland Cement Mortars Containing Low-Carbon Rice Husk Ash
Evaluation of Sulfate Resistance of Portland Cement Mortars Containing Low-Carbon Rice Husk Ash
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DOI：
10.1061/(asce)mt.1943-5533.0000868
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发表时间：
2014-04
影响因子：
3.2
通讯作者：
Harish Kizhakkumodom Venkatanarayanan;P. Rangaraju
中科院分区：
文献类型：
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作者：
Harish Kizhakkumodom Venkatanarayanan;P. Rangaraju
本研究以低碳稻壳灰（RHA）作为水泥砂浆的补充胶凝材料，考察其在硫酸钠和硫酸镁溶液中的抗硫酸盐性。用标准试验方法测定了这些混合物在膨胀和抗压强度损失方面的抗硫酸盐性。砂浆中水胶比（w/cm）为0.40 ~ 0.57，RHA掺量为0 ~ 15%（质量比）。结果表明，当w/cm比为0.40时，砂浆的劣化程度较低，具有较高的抗硫酸盐性。w/cm比分别为0.48和0.57时，对照砂浆比RHA砂浆劣化程度更严重。在任意w/cm比下，砂浆的抗硫酸盐性能随RHA用量的增加而降低。硫酸钠和硫酸镁均会引起试件的显著劣化，但硫酸钠会导致试件膨胀增大，硫酸镁会导致试件抗压强度的显著损失。RHA砂浆的抗硫酸盐性能与硅灰砂浆相当。
In this study, a low-carbon rice husk ash (RHA) was used as a supplementary cementing material in cement mortars to evaluate its sulfate resistance in sodium and magnesium sulfate solutions. The sulfate resistance of these mixtures in terms of expansion and loss of compressive strength was determined using the standard test method.. The water to cementitious material (w/cm) ratio and RHA dosage in the mortars was varied from 0.40 to 0.57 and 0 to 15% (by mass), respectively. The results from this investigation suggest that all mortars with a w/cm ratio of 0.40 showed little deterioration, indicating their high sulfate resistance. For mortars with a w/cm ratio of 0.48 and 0.57, the control mortars showed more deterioration than those with RHA. For mortars at any given w/cm ratio, the sulfate resistance decreased with an increase in the RHA dosage. Though both sodium and magnesium sulfates caused significant deterioration in the specimens, the former caused increased expansions in the test specimens while the latter caused significant loss in compressive strength. The sulfate resistance of RHA mortars was comparable with that of silica fume mortars.