矿粉对纳米SiO2-OPC-CSA体系耐盐渍土侵蚀性影响

Effect of Slag on Salinized Soil Erosion Resistance of Nano SiO2-OPC-CSA System

研究了矿粉对纳米Si O2-普通硅酸盐水泥-硫铝酸盐水泥(纳米Si O2-OPC-CSA)复合体系抗硫酸盐侵蚀能力的影响规律,以试件表观形貌、质量、相对动弹性模量及抗压耐蚀系数的变化表征试件的损伤程度;采用X射线衍射(XRD)仪分析了硫酸盐-干湿循环作用下试样的水化产物,研究矿粉对纳米Si O2-OPC-CSA复合体系耐硫酸盐侵蚀性能的影响机理。结果表明,在硫酸盐-干湿循环作用下,水泥砂浆受到化学侵蚀和物理侵蚀的综合作用,其中物理侵蚀破坏更为严重;当矿粉掺量为10%时,消耗了体系中的氢氧化钙,提高了结构密实度,从而使复合体系的抗硫酸盐侵蚀能力最佳。

The influence of granulated blast furnace slag on the sulfate resistance on nano SiO2-ordinary Portland cement-sulphoaluminate cement(nano SiO2-OPC-CSA)composite system was studied.The damage degree was characterized by the change of appearance,quality,relative dynamic elastic modulus and compressive strength.The hydration product of the sample after sulfate dry-wet cycle corrosion was analyzed by XRD,the influence mechanism of mineral powder on sulfate resistance of nano-SiO2-OPC-CSA composite system was studied.The results show that:under the action of sulfate dry-wet cycles,the cement mortars was affected by chemical erosion and physical erosion,of which physical erosion was more serious;when the slag content was 10%,the calcium hydroxide in the system was consumed,the structure density was improved,so that the composite system showed the best resistance to sulfate attack.