Experimental study on the prediction model of carbonization depth in high Ti-bearing blast furnace slag concrete
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摘要: 混凝土碳化造成钢筋锈蚀是混凝土结构耐久性失效的主要原因。为研究攀枝花高钛型高炉渣混凝土抗碳化性能，对不同强度高钛型高炉渣混凝土进行不同碳化时间的室内加速碳化试验，结果表明：高钛型高炉渣混凝土强度越低，越容易被二氧化碳侵蚀；碳化时间越长，碳化现象越明显。基于Fick第一定律，根据高钛型高炉渣混凝土强度、碳化时间，建立了高钛型高炉渣混凝土碳化深度预测模型。经与试验结果对比，吻合度高，验证了预测模型准确度。Abstract: Reinforcement corrosion caused by concrete carbonation is the main reason of durability failure of concrete structures. In order to study the carbonation resistance of Panzhihua high-titanium blast furnace slag concrete, we herein carried out the indoor accelerated carbonation test of high-titanium blast furnace slag concrete with different strength at different carbonation time. The results show that the lower the strength of high-titanium blast furnace slag concrete, the easier it is to be corroded by carbon dioxide. The longer the carbonation time, the more obvious the carbonation phenomenon. Based on Fick’s first law, a model for predicting the carbonation depth of high-titanium blast furnace slag concrete is established according to the strength and carbonation time of high-titanium blast furnace slag concrete. By comparing with the experimental results, the accuracy of the prediction model is verified.
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Key words:
- high-titanium blast furnace slag /
- concrete /
- carbonation depth /
- prediction model
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图 1 混凝土标准环境加速碳化试验
Figure 1. Accelerated carbonation test of concrete in standard environment
图 3 混凝土碳化深度与混凝土强度关系曲线
Figure 3. Relationship between concrete carbonation depth and concrete strength
图 5 混凝土抗压强度值与碳化强度影响系数关系曲线
Figure 5. Influence coefficient curve of concrete compressive strength and carbonization strength
表 1 全高钛型高炉渣集料混凝土（泵送）配合比
Table 1. Blend ratio of full high-titanium furnace slag aggregate concrete (pumping)
kg/m3 强度等级 42.5
水泥粉煤
灰高钛型高
炉渣砂高钛型高
炉渣碎石用水
量胶结
料C20泵送 239
(32.5 R)117 1139 760 255 356 C25泵送 264 108 1098 795 250 372 C30泵送 285 105 1030 890 220 390 C35泵送 341 92 1000 852 240 433 C40泵送 373 88 920 930 230 461 C45泵送 416 77 898 899 230 493 C50泵送 453 72 830 950 230 525 
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表 2 混凝土碳化深度及强度值
Table 2. Carbonation depth and strength of concrete
强度
等级碳化深度（标准碳化）X/mm fcuk
/MPa3 d 7 d 14 d 28 d C20 14 16 22.5 25 25.96 C25 7 9 13 14 35.66 C30 6 8 8 8 42.29 C35 4 6 6.5 7.5 48.90 C40 2 2.5 4 4 53.12 C45 0 0 0.5 1.5 62.01 C50 0 0 0 0 64.85
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