电解二氧化锰渣替代粉煤灰制备净浆及其抗硫酸盐侵蚀研究

采用不同掺量的电解二氧化锰渣替代粉煤灰制备净浆,并就其力学性能和抗硫酸盐侵蚀性能进行研究,结果表明:水泥净浆的28d抗压、抗折强度和被硫酸盐侵蚀180d后的抗压、抗折强度均随着电解二氧化锰渣的掺入量增加而增加,折压比随着硫酸盐浸泡龄期的增加而出现先增加后降低的过程,电解二氧化锰渣的掺入明显提高了水泥净浆的力学性能和抗硫酸盐侵蚀性能,并改善了试件硫酸盐侵蚀后的脆性;大量膨胀性的AFt水化产物的形成是导致掺粉煤灰净浆在硫酸盐侵蚀下其强度损失严重的主要原因,而大量CH的存在是掺入电解二氧化锰渣后水泥净浆具有比较强的抗硫酸盐侵蚀能力的主要原因。

Different dosage of Electrolytic Manganese Dioxide Residue(EMDR)used to replace fly ash to prepare cement paste,and the strength,anti-sulfate corrosion performance of cement paste were studied,the results show that the 28d compressive strength,28d flexural strength of cement paste were improve after adding EMDR,and the compressive strength,flexural strength of cement paste after 180d immersion test was increase with the addition of EMDR increasing;ratio of bending-compressive strength first increased,then decreased with the increase of the immersion ages;the mechanical properties,brittleness and anti-sulfate corrosion performance of cement paste significant improve by adding EMDR;AFt is the leading cause of loss of strength of cement paste with fly ash,and CH was a major cause of stronger anti-sulfate corrosion of cement paste with EMDR.