高钛重矿渣隧道喷射混凝土力学性能试验研究

Experimental study on mechanical properties of high-titanium heavy slag tunnel shotcrete

利用高钛重矿渣作为骨料制作高钛重矿渣隧道喷射混凝土。试验表明,在粉煤灰、钢纤维掺量一定的情况下,0.34~0.4的水胶比范围内,高钛重矿渣隧道喷射混凝土的适宜水胶比为0.38。掺加波浪型钢纤维可以增强高钛重矿渣隧道喷射混凝土的力学性能,降低高钛重矿渣隧道喷射混凝土回弹率。高钛重矿渣隧道喷射混凝土水化产物主要为C-S-H凝胶和钙矾石,C-S-H凝胶和钙矾石填充在高钛重矿渣碎石和高钛重矿渣砂之间的缝隙,将钢纤维包裹形成较为密实的整体,提高了高钛重矿渣隧道喷射混凝土抗折强度和劈裂强度,降低了高钛重矿渣隧道喷射混凝土的回弹率。

Using high-titanium heavy slag as aggregate to make high-titanium heavy slag tunnel shotcrete.Experiments show that when the content of fly ash and steel fiber is constant,within the range of water-binder ratio of 0.34 to 0.4,the suitable water-binder ratio of high titanium heavy slag tunnel shotcrete is 0.38.The addition of wave-shaped steel fibers can enhance the mechanical properties of the high-titanium heavy slag tunnel shotcrete and reduce the rebound rate of the high-titanium heavy slag tunnel shotcrete.High-titanium heavy slag tunnel sprayed concrete spray products are mainly C-S-H gel and ettringite.C-S-H gel and ettringite fill the gap between high-titanium heavy slag crushed stone and high-titanium heavy slag sand,and wrap steel fibers to form The denser whole improves the flexural strength and splitting strength of the high-titanium heavy slag tunnel shotcrete,and reduces the rebound rate of the high-titanium heavy slag tunnel shotcrete.