C40特细砂混凝土和易性和抗压强度研究

利用邯郸当地的原材料制备C40特细砂混凝土，采用正交设计方法，试验研究了水胶比、粉煤灰取代率、砂率对特细砂混凝土28d抗压强度及和易性的影响。结果表明，粉煤灰取代率是影响混凝土28d抗压强度的最主要因素，砂率是影响混凝土和易性的最主要因素；适当的粉煤灰取代率能提高混凝土28d抗压强度；随着砂率的增加，塌落度大幅下降而强度略有降低；水胶比为0．45，粉煤灰取代率为10％，砂率为30％，通过添加1．2％的高效减水剂可配制出28d强度达59．1MPa、塌落度为60ram的混凝土。

Study on the workability and compressive strength of CdO superfine sand concrete

The C40 super fine sand concrete is produced by using Handan local material and the influ- ence of water - binder ratio, fly ash replacement rate, and sand ratio on the 28 d compressive strength and workability are studied in orthogonal experiment design. The results show that fly ash replacement is the most primary factor effecting on 28 d compressive strength and sand ratio is the most primary factor effecting on workability. Appropriate fly ash replacement can improve the 28 d compressive strength, With the increase of sand ratio, slumps decrease sharply and strength decreases slightly. It calls for using the 0.45 as water - binder ratio, 10% as fly ash replacement and 30% as sand ratio to make reasonable design of mix proportions, we can obtain the super fine concrete strength that its 28 d compressive strength reaches to 59.1MPa , for 60mm of slump.