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按ASTM C1202测试了粉煤灰、矿渣、硅灰等掺合料以及石粉和石屑掺量对再生混凝土抗压强度及抗氯离子渗透性能的影响。结果表明,矿物掺合料可显著改善再生混凝土抗氯离子渗透性能,尤其粉煤灰和硅灰复掺能改善再生混凝土的抗压强度和抗氯离子渗透性能;随着石粉掺量的增大,再生混凝土的抗压强度逐渐降低,抗氯离子渗透性能先增强后减弱,表明适量的石粉能在不影响强度的情况下,显著改善其抗氯离子渗透性能,石粉的最佳掺量为水泥质量的5%;石屑取代率增加虽然能改善混凝土的强度,但过量的石屑会降低再生混凝土抗氯离子渗透性能,试验表明,石屑取代率不宜超过20%。
According to ASTM C1202 tested fly ash, slag, silica fume and other admixtures, as well as stone powder and stone powder content of recycled concrete compressive strength and resistance to chloride ion permeability. The results show that the mineral admixture can significantly improve the resistance to chloride ion permeation of recycled concrete, especially fly ash and silica fume complex can improve the compressive strength and resistance to chloride ion permeability of recycled concrete. As the content of stone powder increases , The compressive strength of recycled concrete is gradually reduced, and the resistance to chloride ion permeability first increases and then decreases, indicating that the appropriate amount of stone powder can significantly improve its resistance to chloride ion penetration without affecting the strength. The optimal content of stone powder is cement Mass of 5%; stone chip replacement rate increase although it can improve the strength of concrete, but excess stone chips will reduce the resistance to chloride ion permeability of recycled concrete, tests show that stone chip replacement rate should not exceed 20%.