ABSTRACT

Concrete-based construction provides enormous advantages by utilizing waste materials and by-products from various sources such as industries, power plants, etc. One of the significant waste materials from the coal-based power plants, pond ash (PA), is highly dumped into landfills, causing critical environmental issues. This study examined the strength, morphological and durability characteristics of coal pond ash concrete. In this investigation, the cement was replaced with 10% of coal pond ash by weight of cement and water – binder ratio of 0.44 was used in all mix proportions. Strength properties were evaluated by using modulus of elasticity test. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) were also performed to evaluate its morphological characteristics. Durability properties such as rapid chloride penetration test, weathering resistance test, acid resistance test and chloride resistance test were conducted. The test results confirmed the efficiency of adding ash to cement material. Ten percent of coal pond ash in concrete had significant resistance against chloride penetration, weathering action, chloride and acid attack. SEM and EDAX analysis confirmed the presence of a higher amount of CSH gels at the increase in age, which promotes more – denser, less porous and compacted microstructure in concrete.

摘要

混凝土建筑通过利用工业、发电厂等各种来源的废料和副产品提供了巨大的优势。煤基发电厂的重要废料之一，池灰 (PA)，被大量倾倒进入垃圾填埋场，造成严重的环境问题。本研究检验了煤塘灰混凝土的强度、形态和耐久性特性。在本次调查中，用水泥和水重量的 10% 的煤塘灰代替水泥——在所有混合比例中使用 0.44 的粘合剂比。通过使用弹性模量测试来评估强度性能。还进行了扫描电子显微镜 (SEM) 和能量色散 X 射线分析 (EDAX) 以评估其形态特征。进行了快速氯化物渗透试验、耐候性试验、耐酸性试验和耐氯化物试验等耐久性能。测试结果证实了向水泥材料中添加灰分的效率。混凝土中 10% 的煤池灰对氯化物渗透、风化作用、氯化物和酸侵蚀具有显着的抵抗力。SEM 和 EDAX 分析证实，随着年龄的增长，存在更多的 CSH 凝胶，这促进了混凝土中更致密、更少孔隙和压实的微观结构。氯化物和酸侵蚀。SEM 和 EDAX 分析证实，随着年龄的增长，存在更多的 CSH 凝胶，这促进了混凝土中更致密、更少孔隙和压实的微观结构。氯化物和酸侵蚀。SEM 和 EDAX 分析证实，随着年龄的增长，存在更多的 CSH 凝胶，这促进了混凝土中更致密、更少孔隙和压实的微观结构。