应用无接触电阻率法研究矿渣水泥的早期水化

通过电阻率变化探讨水泥水化早期阶段的特性.结果表明:在波特兰水泥中加入矿渣,电阻率先随矿渣掺量的增加而增加,水化1d后电阻率随掺量的增加而降低;当加入NaOH时电阻率先逐渐降到最小值,当水化进入到凝结硬化阶段,电阻率快速增加并超过波特兰水泥;当加入NaSO4时电阻率发展早期比较平缓,后期有迅速的增加.对各试样的孔结构参数进行了测试,结果表明孔结构与电阻率有一定的对应关系.

Study on Slag Cement at Early Hydration Stage by Contactless Resistivity Instrument

The hydration characters of cements in early stage were studied by means of testing resistivity change.The results indicate that when adding slag to Portland cement,at first the resistivity increased with the augment of mixed slag amount,however after hydration for 1d,the resistivity decreased with the increase of mixed slag amount.When NaOH was added,resistivity first fell to the minimum,then increased rapidly and exceeded that of Portland cement at hardening stage.When NaSO_4 was added, resistivity changed slowly at first and then rose rapidly.The pore structure parameters were determined and the results illuminated that there was some corresponding relation between pore parameters and resistivity.