EFFECT OF WATER ABSORPTION, POROSITY AND SORPTIVITY ON DURABILITY OF GEOPOLYMER MORTARS
EFFECT OF WATER ABSORPTION, POROSITY AND SORPTIVITY ON DURABILITY OF GEOPOLYMER MORTARS
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Thokchom;P. Ghosh;Somnath Ghosh
中科院分区：
文献类型：
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作者：
S. Thokchom;P. Ghosh;Somnath Ghosh
通过试验研究了吸水率、表观孔隙率和吸水率对粉煤灰基土聚合物砂浆试件在硫酸溶液中耐久性的影响。用含5%~8%Na2O的NaOH和Na2SiO_3的混合物激发低钙F级飞灰，水灰比为0.33。根据土工聚合物砂浆试件在10%硫酸溶液中暴露24周的抗压强度下降来评价其耐久性。碱含量较低的样品具有较高的显气孔率、吸水率和吸水率。在硫酸溶液中浸泡24周后，试件仍有29.4%~54.8%的剩余抗压强度。吸水率、孔隙率和吸水率较高的试件比相应值较小的试件损失更多的强度。试验结果表明，土聚砂浆试件的孔隙率、吸水率和吸水率影响土聚砂浆在硫酸中的耐久性。
An experimental program was carried out to study the effect of water absorption, apparent porosity and sorptivity on durability of fly ash based geopolymer mortar specimens in sulphuric acid solution. Low calcium Class F fly ash was activated by a mixture of NaOH and Na2SiO3 containing 5% to 8% Na2O with water to fly ash ratio of 0.33.The durability of geopolymer mortar specimens was evaluated on the basis of reduction in compressive strength when exposed in 10% Sulphuric acid solution for 24 weeks. Specimens containing lesser alkali were found to possess higher apparent porosity, water absorption and water sorptivity. After 24 weeks in sulphuric acid solution, specimens still had substantial residual compressive strength ranging from 29.4% to 54.8%. Specimens with higher water absorption, porosity and water sorptivity lost more strength than those with lesser corresponding values. Results obtained in the experimental program indicate that porosity, sorptivity and water absorption of geopolymer mortar specimens influences the durability of geopolymer mortars in sulphuric acid.