影响道路水泥干缩率的几个因素

Some Factors,That Influence on Shrinkage of Pavemental Cement

试验研究了道路水泥中各矿物组成以及掺加不同的混合材(如矿渣、粉煤灰、煤矸石、石膏等)对其干缩率的影响。结果表明,干缩率并不只是随C3A含量的增大而增大,它还与其他矿物含量有关,是各矿物共同作用的结果;在本文实验条件下,掺不同混合材的水泥干缩率不同,掺粉煤灰优于掺矿渣,而掺矿渣则又优于掺煤矸石。掺适量石膏可以补偿水泥的体积收缩,但石膏掺量过多又会影响水泥的安定性。

For cement used in pavement construction the influences of chamical compositions, and additives, such as slag, fly ash, coal gangue and gypsum, are experimentally studied. The rezuhs show that the shrinkage rate is not only enlarged as increase of C3A content, but also is related to contents of other mineral compositions, that is the shrinkage rate is a sythesized function of each compounds. And there is a different shrinkage rate as adding different kind of additives, i.e. it＇s better for adding fly ash than slag and better for adding slag than coal gangue. Besides, it is able to compensate the volume contraction of cement when adding appropriate content of gypsum, however the soundness of cement will be influenced by excessive gypsum.