锂渣粉对混凝土气体渗透性能的影响

发布时间：2018-04-12 20:23

本文选题：混凝土 + 锂渣粉　；参考：《混凝土》2017年04期

【摘要】：混凝土的耐久性能与孔结构特征有着密切的联系,锂渣粉作为矿物掺合料能有效的改善混凝土的微观结构减轻有害介质的侵入。利用AUTOCLAM渗透性测试仪测试不同龄期的混凝土气体渗透系数的变化,研究水化进程和矿物掺合料对混凝土气体渗透系数的影响。试验研究了水灰比分别为0.62、0.45、0.38,纯水泥、锂渣粉取代水泥10%、20%、30%的3、7、14、28 d的各龄期混凝土的强度和气体渗透系数。结果表明锂渣混凝土的气体渗透系数受水灰比和锂渣掺量的影响,当水灰比为0.62时,气体渗透系数随着锂渣掺量的增加而明显增大,锂渣的掺入降低了混凝土的渗透性能,但在20%掺量时有最大的水化速率;水灰比为0.45时,20%掺量能改善混凝土的气体渗透性能,且胶凝材料水化速度更快;对于水灰比0.38的混凝土,锂渣掺量30%混凝土的气体渗透系数略高于空白组混凝土,但有更快的水化速度。
[Abstract]:The durability of concrete is closely related to the characteristics of pore structure. Lithium slag powder as mineral admixture can effectively improve the microstructure of concrete and reduce the invasion of harmful media.The change of gas permeability coefficient of concrete at different ages was measured by AUTOCLAM permeability tester, and the effect of hydration process and mineral admixture on permeability coefficient of concrete was studied.The strength and gas permeability of concrete with water cement ratio of 0.62 ~ 0.45 ~ 0.38, pure cement and lithium slag powder replacing 10 ~ (20)% (30%) of concrete of 3 ~ 7 ~ 14 ~ (14) ~ (28) days were studied.The results show that the gas permeability coefficient of lithium slag concrete is affected by the ratio of water to cement and the content of lithium slag. When the ratio of water to cement is 0.62, the gas permeability coefficient increases obviously with the increase of lithium slag content, and the permeability of concrete decreases with the addition of lithium slag.However, the maximum hydration rate was obtained at 20% of the cement content, and the gas permeability of concrete was improved when the water-cement ratio was 0.45, and the hydration rate of the cementing material was faster. For the concrete with water-cement ratio 0.38,The gas permeability coefficient of 30% lithium slag concrete is slightly higher than that of blank concrete, but the hydration rate is faster.
【作者单位】：新疆大学建筑工程学院;
【基金】：国家自然科学基金(51268055)
【分类号】：TU528.041

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