配合比和养护条件对矿渣混凝土某些工程性能的影响

介绍了国外在矿渣混凝土制备方面的试验和研究的成果,为表面系数较低的矿渣取代水泥50%～65%的混凝土(其28d的抗压强度为50MPa)提出了一个简单的配比方法。本方法可使3d后的矿渣混凝土强度能同普通的硅酸盐混凝土相媲美。矿渣取代量较高的混凝土之膨胀应变较大,说明这种混凝土需要较长时间的湿养护。结果着重指出,对于矿渣取代量较高的混凝土,即便是7d湿养护也是不够的。而对于养护不足的矿渣混凝土,如果连续暴露在干燥的环境中,对其之长期耐久性具有不利的影响。

Some engineering properties of slag concrete as Influenced by mix proportioning and curing

Some trial and research results of slag concrete abroad are introduced. This paper presents a simple method to obtain a 50MPa 28 day strength concrete having 50 and 65% by weight cement replacements with slag having a rehtively low specific surface. The method produces slag concrete with strength comparable to ordinary Portland cement concrete from 3days onward. High swelling straim at high slag replacement levels show the need for longer wet curing for such concrete. The results emphasize that even 7-day wet curing was inadequate for high levels of slag replacement, and that continued exposure to a drying environment can have adverse effects on longterm durability of inadequately cured slag concrete.