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结合赣南区域稀土开采残留硫酸铵的环境问题,在后期土地开发的背景下,通过对粉煤灰混凝土、矿渣混凝土、双掺混凝土受硫酸铵腐蚀的试验,测定受腐蚀混凝土的力学性能,分析受腐蚀混凝土强度劣化的规律,并运用灰色关联分析理论对不同掺量矿物掺合料混凝土强度进行关联度分析。结果表明:混凝土中掺入粉煤灰和矿渣等量替换水泥能显著提高混凝土抗硫酸铵腐蚀性能;大掺量矿物掺合料的混凝土强度增长较慢,但抗硫酸铵腐蚀能力较好;矿物掺合料对受腐蚀混凝土的抗压强度衰减有较好延缓效果,但对抗折强度的延缓衰减的效果较差;通过灰色相关理论得粉煤灰掺量10%,矿渣掺量40%和50%腐蚀混凝土的总体强度与未腐蚀混凝土强度关联度达到80%,抗硫酸铵腐蚀效果最佳,与试验结果一致。
Combining with the environmental problems of residue ammonium sulfate in the south of Jiangxi province, the mechanical properties of concrete under corrosion were measured by the test of the corrosion of fly ash concrete, slag concrete and double-mixed concrete by ammonium sulfate in the later stage of land development. Corroded concrete strength by the deterioration of the law and the use of gray relational analysis theory for different content of mineral admixture concrete strength correlation analysis. The results show that the substitution of cement with fly ash and slag can significantly improve the corrosion resistance of concrete against ammonium sulfate. The strength of concrete with high content of mineral admixture increases slowly but the corrosion resistance to ammonium sulfate is better. Admixture has a better effect on the reduction of compressive strength of corroded concrete, but has less effect on the delay and attenuation of the flexural strength. Through the gray theory, the content of fly ash is 10%, the content of slag is 40% and 50 The correlation between the overall strength of% corroded concrete and the strength of non-corroded concrete reaches 80%, and the anti-ammonium sulfate corrode effect is the best, which is consistent with the test results.