混凝土流动性能影响因素试验研究

Experimental Study on Influencing Factors of Concrete Fluidity

混凝土流动性是其和易性的一个重要因素,由坍落度和扩展度测定。本文通过C40大流动性混凝土配制过程,进行了不添加矿物材料、单掺粉煤灰、双掺粉煤灰和矿渣以及双掺粉煤灰和硅灰等试验,结果表明:矿渣掺量达到25%时,混凝土流动效果更好;相同掺量下,硅灰更有利于提高混凝土的流动性;在不添加外加剂的情况下,可以调高砂率改善混凝土流动性。减水剂对混凝土流动性影响最大,其次是粗骨料级配和水胶比,影响最小的是砂率和拌和方式。

The fluidity of concrete is an important factor in its workability, which is determined by slump and expansion. In this paper, through the preparation process of C40 high fluidity concrete, tests are carried out, such as adding no mineral materials, adding only fly ash, adding both fly ash and slag, and adding both fly ash and Silica fume;with the same content of Silica fume, the fluidity of concrete can be improved, and the sand ratio can be increased without the addition of additives. Water-reducing agent has the greatest influence on the fluidity of concrete, followed by coarse aggregate gradation and water-binder ratio, and the least influence is sand ratio and mixing method.