摘要
The pozzolanic activity of coal gangue, which is calcining at 500 to 1 000 ℃, differs distinctly. The simplex-centroid design with upper and lower bounds of component proportion is adopted to study the compressive strength of mortars made with ternary blends of cement, activated coal gangue and fly ash. Based on the results of a minimum of seven design points, three special cubic polynomial models are used to establish the strength predicating equations at different ages for mortars. Five experimental checkpoints were also designed to verify the precision of the equations. The most frequent errors of the predicted values are within 3%. A simple and practical way is provided for determining the optimal proportion of two admixtures when they are used in concrete.
煤矸石经不同的温度（500-1000℃）热活化后，其辅助胶凝性能相差很大．为了研究双掺活化煤矸石与粉煤灰对水泥强度性能的影响，运用单纯形中心设计方法，并确立各组分的上下限，通过7组砂浆实验，得出活化煤矸石粉、粉煤灰多元复合水泥不同龄期强度数学模型。并利用5组砂浆实验，对强度预测方程的精确性进行了研究．实验结果表明方程的计算值与实验测量值相差很小．误薯范围在3％以下．为配制多种混合材的盆合水泥最优配比耀供了一个简单实用的方法．
基金
The National Basic Research Program of China (973Program)(No2000CB610703)
