不同胶凝材料对纳米凹凸棒混凝土耐久性能的影响

Effect of Different Cementitious Materials on Durability of Nano-attapulgite Concrete

本文将不同的矿物掺合理料与纳米凹凸棒相混合,以研究其对纳米凹凸棒混凝土耐久性能的影响。结果表明:矿物掺合料的加入降低了纳米凹凸棒混凝土的早期强度,致其后期强度有所增加。90 d时掺粉煤灰和硅粉的试件抗压强度比基准试件提高6.0%;同时矿物掺合料降低了试件的电通量数值,其中复掺硅粉和矿粉的试件的抗氯离子效果最佳,双掺试件的电通量在28 d时与基准试件相比减少了56.84%。矿物掺合料的掺入有效降低了试件的碳化性能。在碳化初期,与基准试件相比碳化速率加快,随着碳化龄期的增加,碳化速度有所减缓。

This paper blended different mineral materials with nano-attapulgite concrete to study on the effect of them on the concrete durability. Results showed that the addition of mineral admixtures reduced the early strength of nano-attapulgite concrete and then increased. The test-piece mixed fly ash and silica fume increased by 6.0% than the benchmark specimen for 90 d. At the same time, the mineral admixtures reduced the electric flux value of test-piece, if silicon powder was added in them, the resistance to chloride ion effect was best and its electric flux decreased by 56.84% than the benchmark specimen for 28 d. The addition of mineral admixtures effectively reduced the carbonation of test-piece. At the beginning, carbonation speed was quicker and then slower with carbonation time increase compared with the benchmark specimen.