高钙粉煤灰掺量配比对不同建筑材料的性能影响研究

Study on the effect of high calcium fly ash content ratio on the properties of different building materials

为推动高钙粉煤灰的资源化利用,利用矸石电厂高钙粉煤灰+水泥+砂子+水制备一种高强建材,并对其进行力学性能和耐久性能试验。结果表明,随着高钙粉煤灰占比增加,建材的强度逐渐降低;水泥占比一定的情况下,随着砂子占比增加,建材的抗压强度逐渐增大,当水泥和砂子占比各为20%时,强度可达C30;当砂子占比一定时,水泥占比为20%的强度高于占比为10%的强度;掺入水泥和砂子均可以有效降低建材的吸水性,同时增强抗冻性能,当高钙粉煤灰∶水泥∶砂子=6∶2∶2,水固比为0.27时,建材中的原生裂隙孔隙较少,密实度更高,更有利于建材后期性能的提升。

In order to promote the resource utilization of high calcium fly ash,a high-strength building material was prepared using high calcium fly ash from gangue power plants,together with cement,sand,and water,and its mechanical and durability properties were tested.The results showed that as the proportion of high calcium fly ash increased,the strength of building materials gradually decreased.When the proportion of cement was constant,as the proportion of sand increased,the compressive strength of building materials gradually increased.When the pro⁃portion of cement and sand was 20%each,the strength could reach C30.When the proportion of sand was con⁃stant,the strength of cement with a proportion of 20%was higher than that with a proportion of 10%.Mixing ce⁃ment and sand could effectively reduce the water absorption of building materials and enhance their frost resistance.When high calcium fly ash∶cement∶sand=6∶2∶2,and the water solid ratio was 0.27,the original crack pores in the building materials were less,the density was higher,and it was more conducive to the improvement of the later per⁃formance of the building materials.