10℃下不同水灰比水泥基材料抗硫酸盐侵蚀性能试验研究

Sulfate Resistance of Cement Based Material with Different Water-Cement Ratio at 10 ℃

研究了不同水灰比对水泥砂浆试件在10℃下抗硫酸盐侵蚀的性能的影响,采用0.36与0.5两种水灰比的普通硅酸盐水泥、中抗硫水泥以及加入矿粉与硅灰的水泥砂浆试件,测试各试样在(10±1)℃的3%Na_2SO_4溶液中浸泡后的强度变化情况,综合考虑强度与抗蚀系数对砂浆抗硫酸盐侵蚀性能进行评价。结果表明:在10℃下0.36水灰比试件强度高于0.5水灰比试件,抗硫酸盐侵蚀性能随着水灰比的降低而提高;加入矿物掺合料明显改善了水泥砂浆抗硫酸盐侵蚀性能,并且硅灰的含量越高效果越明显。砂浆抗硫酸盐侵蚀性能15%矿粉+3%硅灰>15%矿粉+1%硅灰>中抗硫水泥>普通硅酸盐水泥。

The effects of different water-cement ratio cement mortar samples against sulfate attack at 10 Tl were studied. Ordinary portland cement, medium sulfur-resistant cement and slag with silica fume cement mortar samples were prepared with cement ratio of 0. 36 and 0. 5. Mortar samples were stored in 3 % Na2S04 sulfate solution at （10 ± 1 ） T l,and their strength developments were measured. Sulfate resistance of mortar samples was evaluated by considering the mortar strength and corrosion resistance.The results show that, at 10 Tl , the strength of 0. 36 water-cement ratio mortar is higher than 0. 5 water- cement ratio, and the sulfate resistance increases with the decrease of water-cement ratio. The addition of mineral admixture improves the sulfate resistance, and the better the sulfate resistance, the more the addition of silica fume. The mortar resistance to sulfate attack is 15% slag ＋ 3 % silica fume 〉 1 5 % slag ＋ 1 % silica fume 〉 medium sulfur-resistant cement 〉 ordinary portland cement.