Experimental study on mechanical properties of high-titanium heavy slag tunnel shotcrete
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摘要: 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。Abstract: 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.
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Key words:
- high titanium heavy slag /
- tunnel shotcrete /
- mechanical properties /
- rebound rate
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图 1 不同水胶比下高钛重矿渣隧道喷射混凝土：(a)抗压、抗折强度;(b)抗拉强度
Figure 1. High-titanium heavy slag tunnel shotcrete under different water–binder ratios: (a) compressive and flexural strength; (b) Tensile strength
图 2 不同水胶比下高钛重矿渣隧道喷射混凝土回弹率
Figure 2. Rebound ratio of spraying in high-titanium heavy slag tunnel shotcrete with different water-binder ratios
图 3 钢纤维对高钛重矿渣隧道喷射混凝土力学性能的影响
Figure 3. Effect of steel fibers on mechanical properties of high-titanium heavy slag tunnel shotcrete
图 4 高钛重矿渣隧道喷射混凝土试块SEM形貌
Figure 4. SEM images of the high-titanium heavy slag tunnel shotcrete test block
图 5 高钛重矿渣隧道喷射混凝土试块XRD
Figure 5. XRD patterns of the high-titanium heavy slag tunnel shotcrete
表 1 高钛重矿渣化学组成
Table 1. Chemical composition of high titanium heavy slag
% SiO2 CaO TiO2 Al2O3 MgO Fe2O3 MnO SO3 TFe 23.3 25.6 21.3 12.7 8.1 1.9 0.5 1.4 5.2 
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表 2 高钛重矿渣物理性能指标
Table 2. Physical performance index of high-titanium heavy slag
指标 堆积密度/
（kg·m−3）表观密度/
（kg·m−3）压碎指标
值/%吸水率/% 高钛重矿渣 1370 2740 8 6.2 高钛重矿渣砂 1680 3140 7 7.1
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表 3 水泥各项品质指标
Table 3. Various quality indexes of cement
抗压强度/MPa 抗折强度/MPa 凝结时间/min 烧失量/% 比表面积/
(m2·kg−1)3 d 28 d 3 d 28 d 初凝 终凝 28.8 45.6 5.4 7.6 185 285 1.93 360
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