【摘要】 对比试验结果显示，大掺量粉煤灰混凝土孔隙液相碱度（ｐＨ值）与普通混凝土相比７天后降低明显，２００天接近１１．５的临界值，通过外掺适量石灰和硫酸钠，在强度不降低甚至有所提高的情况下，可显著提高粉煤灰混凝土的液相碱度。更多还原

【Abstract】 It is shown that the alkalinity of pore fluid of high addition flyash concrete decreases more greatly than that of normal concrete after 7 days,closing to the threshold value of 11.5.Having added 10%lime and 1.5%Na2SO4 in flyash concrete,the alkalinity increased evidently without reducing its strength.更多还原