含掺合料混凝土氯盐侵蚀后孔结构特征试验研究

摘要

对氯盐侵蚀后不同掺合料混凝土进行了压汞试验，从细观角度研究了掺合料对混凝土孔结构特征的影响。结果表明：单掺粉煤灰20%、35%和50%以及单掺矿粉35%和50%，均有效降低了混凝土的总孔隙率，单掺50%矿粉时总孔隙率最小；单掺粉煤灰20%、35%以及单掺矿粉35%和50%，均有效降低了混凝土的总孔面积，单掺50%矿粉时总孔面积最小；单掺粉煤灰20%、35%和50%以及单掺矿粉35%和65%，均有效降低了混凝土的平均孔径，且单掺65%矿粉时平均孔径最小；单掺粉煤灰35%和50%及单掺矿粉65%时，最可几孔径较基准混凝土明显减小，混凝土孔径得到细化；单掺粉煤灰35%和50%以及单掺矿粉35%和65%均使多害孔、有害孔比例减小，且粉煤灰掺量在50%左右，有害孔比例最小，混凝土抗渗性能最好。%The pore structure feature of concrete mixed with mineral admixture after chloride corrosion was studied through MIP.The results showed that fly ash(20%,35%,50%) and slag(35%,50%) reduced the porosity,and the porosity was the least when the SG's per-centage was 50%.Fly ash(20%,35%) and slag(35%,50%) reduced the total pore area,and the total pore area has a minimum value when the SG's percentage was 50%.Fly ash(20%,35%,50%) and slag(35%,65%) reduced the average pore size,and the value became lowest when the SG's percentage was 65%.Fly ash(35%.50%) and slag(65%) reduced the most probable aperture.Fly ash(20%,35%,50%) and slag (35%,65%) reduced the percentage of much harm pore and the harmful pore.When the dosage of fly ash was around 50%,the pore structure and anti-penetrability performance of concrete became best because the percentage of harmful pore was the lowest.