Application of alkali-activated slag concrete in railway sleepers
Application of alkali-activated slag concrete in railway sleepers
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DOI：
10.1016/j.matdes.2014.12.051
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发表时间：
2015-03-15
影响因子：
8.4
通讯作者：
Mohebi, Reza
中科院分区：
文献类型：
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作者：
Shojaei, Mohammad;Behfarnia, Kiachehr;Mohebi, Reza
本文对碱矿渣混凝土在预应力混凝土轨枕中的应用进行了试验研究。今天，水泥工业排放的二氧化碳占大气排放总量的6%至7%。因此，必须寻求替代粘合剂以提供环境友好的材料。一种可能的替代方案是应用碱活化粘合剂，例如碱活化矿渣混凝土。研究了其混合料的优化设计。通过考虑氢氧化钠溶液浓度、氢氧化钠与水玻璃的比例、碱与矿渣的比例和骨料含量等4个影响因素，采用田口设计试验方法确定了最佳混合料设计方案，使混合料的抗压强度达到最大。根据欧洲标准EN 13230的要求，制造并测试了B70预应力混凝土轨枕。结果表明，碱矿渣混凝土制成的预应力混凝土轨枕满足铁路标准要求。此外，通过生态力学指标对AAS与普通波特兰水泥（OPC）混凝土的性能进行了对比，结果表明AAS混合料的生态力学性能优于普通混凝土。(C)2015爱思唯尔有限公司版权所有。
In this research work, the application of alkali-activated slag (AAS) concrete in manufacturing prestressed concrete railway sleepers was experimentally studied. Today, the cement industry is responsible for emitting between 6% and 7% of all the CO2 emission into the atmosphere. Therefore, it is essential to seek alternative binders to provide environmentally friendly materials. One possible alternative is the application of alkali activated binders such as alkali activated slag concrete. The optimal design of its mixture was studied in this investigation. By considering four influential factors including the concentration of sodium hydroxide (NaOH) solution, sodium hydroxide to sodium silicate ratio, alkaline solution to slag ratio, and aggregate content, the optimal mixture design that provided the maximum compressive strength was identified by the Taguchi design of the experiment method. B70 prestressed concrete sleepers were made and tested based on the requirements of the European standard EN 13230. The results showed that prestressed concrete sleepers made by alkali activated slag concrete could meet the requirements of railway standards. In addition, comparison between AAS and Ordinary Portland Cement (OPC) concrete efficiency by means of eco-mechanical indicator showed that the eco-mechanical performance of AAS mixture is better than that of ordinary concrete used for railway sleepers. (C) 2015 Elsevier Ltd. All rights reserved.