境外铁路项目恶劣环境下混凝土配合比试配研究-《高速铁路技术》

文章信息/Info

Title:: Experimental Study on Mix Proportion of Concrete in Severe Environment in Overseas Railway Project

Author(s):: YU Xiaozhou; China State Railway Group Co., Ltd., Beijing 100038, China

Keywords:: overseas project|chloride environment|optimization design|strength|mix proportion

摘要:: 本文依托中老铁路的项目，探讨境外铁路项目混凝土原材料性能不同于国内的情况下，铁路隧道二衬混凝土的配合比试配。本项目处于氯盐环境、盐类结晶破坏环境、化学侵蚀环境等复杂、恶劣的地域环境下，环境对混凝土耐久性及工作性能要求更为严苛，因此对配合比设计时采用的水胶比、胶凝材料用量、矿物掺合料的选择范围更加严格。本文通过对原材料配用量优化及外加剂的选择调整，进行了多次试验、分析、对比，优化配合比设计，得到了最佳方案，满足了混凝土性能，有效降低了成本，确保了工程质量。

Abstract:: Based on the construction of China-Laos railway, this paper mainly discusses the experimental mix proportion of the secondary lining concrete of the tunnel in overseas railway project on the condition that the performance of raw material is different from that in China. The project is located in complicated and harsh environmental conditions such as chloride environment, salt crystal destruction environment and chemical corrosion environment, which is more stringent for concrete durability and working performance. Therefore, the water-binder ratio, amount of cementitious material and selection range of mineral admixtures are required to be stricter in mix proportion design. Through dosing optimization of the raw material and the selection and adjustment of admixtures and according to many tests, analysis, comparison and optimization of mix proportion design, the best scheme is obtained, which meets the concrete performance, effectively reduces the cost and ensures the project quality.