为了研制环保节能喷射混凝土，在喷射混凝土胶凝材料中掺入尽可能多的工业废料粉煤灰代替普通硅酸盐水泥，开展粉煤灰掺量对喷射混凝土耐久性的影响试验研究。通过研究得到以下结论： 粉煤灰对喷射混凝土的早期抗压强度影响较大，对其后期抗压强度影响相对较小；在喷射混凝土胶凝材料中掺入20%以下的粉煤灰等量代替普通硅酸盐水泥，可保证喷射混凝土基本力学性能，并能够有效提高其耐久性能，降低工程造价；电通量能够综合反映喷射混凝土的密实性，可作为喷射混凝土的一个综合耐久性指标。

The Portland cement is replaced by fly ash as much as possible in cementing material of shotcrete so as to develop a kind of environmental protection and energy saving shotcrete. The influence of fly ash content on durability of shotcrete is studied. Some conclusions are drawn as follows: 1) The fly ash has a significant influence on early compressive strength of shotcrete, but has little influence on its late compressive strength. 2) The content of fly ash of less than 20% in cementing material can guarantee the basic mechanical properties of shotcrete, improve the durability of shotcrete and reduce the construction cost. 3) The electric flux which can reflect the compactness of the shotcretre comprehensively can be a assessment index of durability of shotcrete.