Creep property prediction of alkali-activated fly ash-slag concrete
Article Text (Baidu Translation)
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摘要: 为探讨碱激发粉煤灰-矿渣混凝土的徐变预测方法，开展了不同应力强度比、强度、加载龄期的碱激发粉煤灰-矿渣混凝土的徐变试验，探讨了碱激发混凝土的基本徐变和干燥徐变与水泥混凝土的相似性与差异性；结合既有徐变数据，提出了基于欧洲混凝土协会（CEB-FIP）的徐变模式的修正预测方法。结果表明：碱激发混凝土的线性徐变临界点在应力强度比为0.6~0.8；碱激发混凝土的基本徐变大于同等强度的水泥混凝土，而干燥徐变在加载前期发展较慢；碱激发混凝土的徐变系数随强度、加载龄期的变化规律与水泥混凝土类似，CEB-FIP徐变模式中双曲幂函数依然可用于碱激发混凝土的徐变预测；参数分析表明，影响名义徐变系数的内部相对湿度参数需修正，用以匹配碱激发混凝土基本徐变较大的情况，此外徐变随时间发展系数也需围绕内部相对湿度加以修正。建立的徐变预测模型可为碱激发混凝土结构的徐变性能研究提供有效途径。Abstract: To discuss the creep prediction method for alkali-activated fly ash-slag concrete, creep tests on alkali-activated fly ash-slag concrete under varying stress-strength ratios, strength levels, and loading ages were carried out. The similarities and differences between alkali-activated concrete and cement concrete in the basic creep and drying creep were explored. Based on the existing creep data, a modified prediction method based on the creep model of the European Concrete Committee (CEB-FIP) was proposed. The results reveal that the critical point for linear creep in alkali-activated concrete occurs at a stress-strength ratio of 0.6-0.8. Additionally, the basic creep of alkali-activated concrete exceeds that of cement concrete with equivalent strength, while its drying creep develops more slowly during the early loading stage. The variation patterns of the creep coefficient with strength and loading age resemble those of cement concrete. The hyperbolic power function from the CEB-FIP creep model remains applicable for predicting the creep of alkali-activated concrete. According to the parameter analysis, the internal relative humidity term affecting the notional creep coefficient needs adjustment so as to match the higher basic creep of alkali-activated concrete. In addition, the coefficient describing the time development of creep should also be modified with respect to internal relative humidity. The established creep prediction model offers a viable approach for investigating the creep property of alkali-activated concrete structures.
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Key words:
- bridge engineering /
- alkali-activated concrete /
- creep test /
- prediction model /
- basic creep /
- drying creep /
- creep development
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图 2 不同应力强度比下的基本徐变系数
Figure 2. Basic creep coefficients with various stress-strength ratios
表 1 基于质量百分比的原料的化学组成
Table 1. Chemical composition of raw materials based on weight percentage
% 组成物质 CaO SiO2 Al2O3 MgO SO3 TiO2 K2O Fe2O3 其他 高炉矿渣 44.06 30.23 13.72 5.58 3.16 1.79 0.50 0.41 0.55 粉煤灰 3.05 56.90 31.24 0.54 0.61 1.34 2.06 3.80 0.46 
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表 2 碱激发粉煤灰-矿渣混凝土的配合比
Table 2. Mixed ratios of alkali-activated concrete
编号 粉煤灰与矿渣的质量比 水胶比 碱当量/% 模数 浆骨比 砂率 28 d立方体标准抗压强度/MPa AAC-40 5：5 0.43 4.2 1.2 1：4 0.375 40.20 AAC-45 5：5 0.41 4.0 1.2 1：4 0.375 48.67 AAC-50 7：3 0.41 5.0 0.8 1：4 0.375 52.16 AAC-55 7：3 0.40 5.0 0.8 1：4 0.375 56.40
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表 3 徐变系数的测试值与模型计算对比
Table 3. Comparison between tested and calculated value creep coefficients
参数 基本徐变系数 干燥徐变系数 AAC-55 AAC-50 AAC-45 AAC-40 11 d加载 7 d加载 14 d加载 28 d加载 14 d加载 持载30 d 持载90 d 持载15 d 持载30 d 持载180 d 测试值 0.478 0.553 1.151 0.870 0.706 1.077 1.364 2.278 计算值 0.403 0.419 0.662 0.581 0.511 1.234 1.499 2.299 变化率/% 18.6 32.0 73.9 49.7 38.2 -12.7 -9.0 -0.9
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