张 戈1,安明喆1,王 月1,王 靖2,黄良贤1,刘俊元2
张戈,安明喆,王月,等.隧道湿喷高性能喷射混凝土配合比试验研究[J].混凝土与水泥制品,2021(12):12-15,28.
ZHANG G,AN M Z,WANG Y,et al.Experimental Study on Mix Proportion of High Performance Wet-mix Shotcrete in Tunnel[J].China Concrete and Cement Products,2021(12):12-15,28.
隧道湿喷高性能喷射混凝土配合比试验研究
张 戈1,安明喆1,王 月1,王 靖2,黄良贤1,刘俊元2
张戈,安明喆,王月,等.隧道湿喷高性能喷射混凝土配合比试验研究[J].混凝土与水泥制品,2021(12):12-15,28.
ZHANG G,AN M Z,WANG Y,et al.Experimental Study on Mix Proportion of High Performance Wet-mix Shotcrete in Tunnel[J].China Concrete and Cement Products,2021(12):12-15,28.
摘 要:基于回弹率、强度和耐久性的要求,进行了胶凝材料用量、水胶比及砂率对喷射混凝土性能影响的试验研究。结果表明:水胶比影响着喷射混凝土的内聚力和黏附力,是影响回弹率的最主要因素;受工作性和施工工艺的影响,胶凝材料用量是影响喷射混凝土1 d和28 d抗压强度的主要因素;当胶凝材料用量为540 kg/m3、水胶比为0.38、砂率为50%、硅灰掺量为15%时,可制备出回弹率为8.2%,28 d抗压强度为71.2 MPa,电通量为133 C,抗冻等级大于F300,28 d碳化深度为2 mm的高性能喷射混凝土。
Abstract: Based on the requirements of rebound rate, strength and durability, the experimental study on the influence of the content of cementitious materials, water-binder ratio and sand ratio on the performance of shotcrete was carried out. The results show that the water-binder ratio affects the cohesion and adhesion of shotcrete, which is the most important factor affecting the rebound rate. Affected by workability and construction technology, the content of cementitious materials is the main factor affecting the compressive strength of shotcrete at 1 d and 28 d. The high-performance shotcrete with dosage of cementitious material is 540 kg/m3, water-binder ratio is 0.38, sand ratio is 50% and silica fume content is 15% has excellent properties. Its rebound rate is 8.2%, the 28 d compressive strength is 71.2 MPa, the electric flux is 133 C, and the frost resistance level is greater than F300, and the 28 d carbonation depth is 2 mm.
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