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针对盐类及冻融循环耦合作用环境,选择混凝土单面盐冻试验方式,研究矿物掺合料及引气剂对混凝土抗冻剥蚀性能的改善作用。结果表明:与基准混凝土相比,在混凝土中掺加活性矿物掺合料和引气剂能够减小混凝土的剥蚀量和相对动弹性模量损失率,提高混凝土的抗盐冻剥蚀性能;掺加磨细矿渣的混凝土抗盐冻剥蚀性能优于粉煤灰混凝土,与其他配合比混凝土相比,复掺粉煤灰、硅灰和引气剂的混凝土,抗盐冻剥蚀性能最好。因此,在盐类存在的冻融环境应提倡矿物掺合料复掺技术。单面盐冻后,混凝土的表面剥蚀量都较大,但混凝土的相对动弹性模量损失率相对较小,因此在单面盐冻过程中混凝土的破坏形式以表面剥蚀为主。
Aiming at the coupling environment of salt and freeze-thaw cycles, the single-side salt-freezing test mode of concrete was chosen to study the effect of mineral admixtures and air-entraining agents on the anti-freezing and denudation properties of concrete. The results show that compared with the benchmark concrete, the addition of active mineral admixtures and air entraining agents to concrete can reduce the denudation of concrete and relative dynamic elastic modulus loss rate, and improve the anti-freezing and anti-freezing properties of concrete. The anti-freezing and denudation performance of the ground slag concrete is better than that of the fly ash concrete. Compared with other mix concrete, the concrete mixed with fly ash, silica fume and air entraining agent has the best anti-freezing and denudation performance. Therefore, in the presence of salt freezing and thawing environment should be promoted mineral admixture compound technology. The surface denudation of concrete is larger after one-side salt frost, but the relative dynamic elastic modulus loss rate of concrete is relatively small. Therefore, the destruction of concrete in the process of single-side salt frost is dominated by surface erosion.