Experimental study on special strength curve of rebound method for concrete evaluation of high-titanium slag concrete
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摘要: 在“碳达峰、碳中和”背景下，攀枝花地区推广应用高钛型高炉渣作为粗、细骨料制备混凝土。为提高回弹法检测高钛型高炉渣混凝土强度的准确度，运用高钛型高炉渣粗、细骨料制备强度等级为C20、C25、C30、C35、C40、C45、C50、C55、C60、C65、C70，边长为150 mm的高钛型高炉渣混凝土立方体试块，饱水养护7 d后自然养护21 d，再将其放入室内加速碳化箱加速碳化0、3、7、14、28 d，进行回弹—抗压—碳化深度测定试验。根据《回弹法检测混凝土抗压强度技术规程》（JGJ/T23-2011）推定混凝土强度值与实际抗压强度对比，分析回弹值、碳化深度与实际抗压强度值之间的关系，研究表明：直接运用《规程》测定混凝土回弹强度值普遍低于实际抗压强度值，差值较大，结果过于保守；在《规程》测定值基础上加10 MPa快速判定高钛型高炉渣混凝土回弹强度，精度高于《规范》推定値；基于回弹值、实际强度关系，结合碳化程度修正，运用最小二乘法拟合建立了精度更高的回弹法测定攀西地区高钛型高炉渣混凝土抗压强度的地区测强曲线
$ f_{cu,i}^c = {\text{0}}{\text{.380 3}}R_{\text{m}}^{{\text{1}}{\text{.362 7}}} \cdot {\text{1}}{{\text{0}}^{{{( - 0}}{\text{.008 3}}{{{d}}_{\text{m}}}{\text{)}}}} $ 。Abstract: Under the background of “achieving peak carbon dioxide emission and carbon neutrality,” high-titanium furnace slag is widely used as coarse and fine aggregate to prepare concrete in Panzhihua city of China. The purpose of this paper is to improve the accuracy of strength detection of high titanium slag concrete by springback method. Coarse and fine aggregates of high-titanium blast furnace slag are used to make high-titanium blast furnace slag concrete cubic blocks with strength grade of C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70 and side length of 150 mm. Saturated with water for 7 days and then naturally cured for 21 days, then these test blocks were put into the indoor accelerated carbonization box to accelerate carbonization for 0 days, 3 days, 7 days, 14 days and 28 days, respectively, and the rebound-compression-carbonization depth tests are carried out. According to “Technical Specification for Inspecting of Concrete Compressive Strength by Rebound Method” (JGJ/T23-2011), this paper compares the presumed concrete strength value and the actual compressive strength to analyze the relationship between the rebound value, carbonation depth and the actual compressive strength value, the rebound strength of concrete measured by direct use of the “Rules” is generally lower than the actual compressive strength, the difference is large, the result is too conservative. On the basis of the values measured in the above-mentioned “Specification,” 10 MPa is added for the rapid determination of the springback strength of high-titanium furnace slag concrete with a precision higher than that of the “Specification.” In this paper, based on the relationship between rebound value, actual strength and carbonization degree correction, we established the regional strength curve of high-titanium blast furnace slag concrete compressive strength of Panxi area with higher accuracy by using the least square method fitting$f_{cu,i}^c = {\text{0}}{\text{.380 3}}R_{\text{m}}^{{\text{1}}{\text{.362 7}}} \cdot {\text{1}}{{\text{0}}^{-{\text{( 0}}{\text{.008 3}}{{{d}}_{\text{m}}}{\text{)}}}}$ . -
图 1 高钛型高炉渣SEM微观形貌
Figure 1. SEM microstructure of high-titanium oxide blast furnace slag
图 3 标准环境加速碳化试验
Figure 3. Accelerated carbonation test of concrete in stand-ard environment
图 4 回弹值与实际抗压强度的关系
Figure 4. The relationship between rebound value and actual compressive strength
图 5 《规程》推定强度值、《规程》推定强度值+10 MPa 与实际抗压强度之间的关系
Figure 5. Relationship between the presumed strength value of the “Specification,” the presumed strength value of the Specification value+10 MPa and the actual compressive strength value
图 6 实际抗压强度值、拟合强度值与《规程》推定强度值对比
Figure 6. Comparison diagram of the actual compressive strength, the fitting strength and the presumed strength of the “Specification”
表 1 高钛型高炉渣成分及含量
Table 1. Composition and content of high-titanium blast furnace slag
% F Na2O MgO Al2O3 SiO2 SO3 K2O CaO TiO2 V2O5 MnO Fe2O3 其他 0.1 0.8 10 12 22 0.5 0.5 28 20 0.6 0.9 1.3 3.3 
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