Early shrinkage characteristics of high performance geopolymer concrete
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摘要: 为研究高性能地聚物混凝土的早期收缩性能，进行系列试验研究与分析。研究表明：在试验掺量变量范围内，硅灰掺量及水玻璃模数对高性能地聚物混凝土早期干燥收缩影响一致，均先减小后增大；硅灰掺量及钢纤维掺量对高性能地聚物混凝土早期自收缩影响一致，均先增大后减小，之后再增大。在水玻璃模数范围内，水玻璃模数对高性能地聚物混凝土早期自收缩均为负面影响，增大水玻璃模数，高性能地聚物混凝土早期自收缩均依次增大。在试验钢纤维掺量范围内，钢纤维掺量对高性能地聚物混凝土早期干燥收缩均为正面影响，增加钢纤维掺量，高性能地聚物混凝土早期干燥收缩均依次降低。高性能地聚物混凝土试件早期干燥收缩均在1411×10−6~4387×10−6之间，早期自收缩均在856×10−6~1188×10−6之间。随龄期增长，高性能地聚物混凝土干燥收缩初期增长较快，自收缩先略微减小后快速增长，之后均逐渐趋于平缓，并可将早期收缩曲线分为3个阶段(快速增长段、缓慢增长段和稳定段)。基于早期干燥收缩实测值，验证了GL2000模型对高性能地聚物混凝土早期干燥收缩曲线的适用性。Abstract: In order to study the early shrinkage performance of high performance geopolymer concrete, a series of experimental research and analysis were carried out. The results show that the influence of silica fume content and water glass modulus on the early drying shrinkage of high performance geopolymer concrete is consistent within the range of test content, which decreases first and then increases. The influence of silica fume content and steel fiber content on the early autogenous shrinkage of high performance geopolymer concrete is consistent, which increases first and then decreases, and then increases. In the range of water glass modulus, the water glass modulus has a negative effect on the early autogenous shrinkage of high performance geopolymer concrete. Increasing the water glass modulus, the early autogenous shrinkage of high performance geopolymer concrete increases in turn. In the range of steel fiber content in the test, the steel fiber content has a positive effect on the early drying shrinkage of high performance geopolymer concrete. With the increase of steel fiber content, the early drying shrinkage of high performance geopolymer concrete decreases in turn. The early drying shrinkage of high performance geopolymer concrete specimens is between 1411×10−6-4387×10−6, and the early autogenous shrinkage is between 856×10−6-1188×10−6. With the increase of age, the drying shrinkage of high performance geopolymer concrete increases rapidly in the early stage, and the autogenous shrinkage decreases slightly first and then increases rapidly, and then gradually tends to be gentle. The early shrinkage curve can be divided into three stages (rapid growth stage, slow growth stage and stable stage). Based on the measured values of early drying shrinkage, the applicability of GL2000 model to the early drying shrinkage curve of high performance geopolymer concrete was verified.
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Key words:
- high performance /
- geopolymer concrete /
- silica fume /
- water glass modulus /
- steel fiber /
- drying shrinkage /
- self-shrinkage
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图 3 硅灰掺量对高性能地聚物混凝土早期收缩性能的影响
Figure 3. Effect of silica fume content on early shrinkage of high performance geopolymer concrete
图 4 水玻璃模数对高性能地聚物混凝土早期收缩性能的影响
Figure 4. Effect of water glass modulus on early shrinkage of high performance geopolymer concrete
图 5 钢纤维掺量对高性能地聚物混凝土早期收缩性能的影响
Figure 5. Effect of steel fiber content on early shrinkage of high performance geopolymer concrete
图 6 高性能地聚物混凝土早期干燥收缩试验曲线
Figure 6. Early drying shrinkage test curves of high performance geopolymer concrete
图 7 高性能地聚物混凝土早期干燥收缩速率曲线
Figure 7. Early drying shrinkage rate curves of high performance geopolymer concrete
图 8 高性能地聚物混凝土早期自收缩试验曲线
Figure 8. Early autogenous shrinkage test curves of high performance geopolymer concrete
图 9 高性能地聚物混凝土早期自收缩速率曲线
Figure 9. Early autogenous shrinkage rate curves of high performance geopolymer concrete
图 10 GL2000模型高性能地聚物混凝土早期干燥收缩预测曲线和试验曲线对比
Figure 10. Comparison of GL2000 model early drying shrinkage prediction curves and test curves of high performance geopolymer concrete
图 11 不同水泥品种对混凝土收缩影响系数K
Figure 11. Influence coefficient K of different cement varieties on concrete shrinkage
图 12 中国建筑科学研究院(CABR)收缩模型高性能地聚物混凝土早期干燥收缩预测曲线和试验曲线对比
Figure 12. Comparison of early drying shrinkage prediction curves and test curves of shrinkage model of China Academy of Building Research (CABR) for high performance geopolymer concrete
表 1 钢纤维各项性能指标
Table 1. Performance indicators of steel fiber
Length/mm Diameter/μm Elastic modulus/GPa Tensile strength/MPa Elongation/% Density/(g·cm−3) 13 200 220 3000 3-5 7.5 
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表 2 水玻璃成分及性能指标
Table 2. Composition and performance index of water glass
SiO2/(kg·m−3) Na2O/(kg·m−3) H2O/(kg·m−3) °Bé Modulus Density/(g·cm−3) 26.8 8.5 64.7 40 3.22 1.38 Note: °Bé—Baume degree.
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表 3 高性能地聚物混凝土配合比 (kg·m−3)
Table 3. Mix proportion of high performance geopolymer concrete (kg·m−3)
Slag Fly ash Silica fume Steel fiber Sand NaOH Na2O·nSiO2 Water 688 172 45 156 905 56 314 87
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表 4 早期收缩性能试验配合比 (kg·m−3)
Table 4. Early shrinkage performance test mix proportion (kg·m−3)
Packet number Slag Fly ash Silica fume Steel fiber Sand NaOH Na2O·nSiO2 Water G-1 688 172 45 (5wt%) 150 (2vol%) 905 56 (1.4) 314 87 G-2 652 163 90 (10wt%) 150 905 56 314 87 G-3 616 154 135 (15wt%) 150 905 56 314 87 G-4 580 145 180 (20wt%) 150 905 56 314 87 G-5 688 172 45 150 905 72.53 (1.2) 314 87 G-6 688 172 45 150 905 43.65 (1.6) 314 87 G-7 688 172 45 0 (0vol%) 905 56 314 87 G-8 688 172 45 75 (1vol%) 905 56 314 87 G-9 688 172 45 225 (3vol%) 905 56 314 87
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表 5 高性能地聚物混凝土28天龄期立方体抗压强度$ {f}_{\mathrm{c}\mathrm{m}28} $值 (MPa)
Table 5. Measured value of 28 days compressive strength ($ {f}_{\mathrm{c}\mathrm{m}28} $) of high performance geopolymer concrete (MPa)
Packet number ${f}_{\mathrm{c}\mathrm{m}28} $ G-1 104.3 G-2 110.0 G-3 109.9 G-4 114.4 G-5 106.0 G-6 91.7 G-7 77.1 G-8 86.5 G-9 94.9
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