INFLUENCE OF BINDERS, MIX PROPORTIONS, AND FABRICATION METHOD ON THE CHARACTERISTICS OF FLY ASH AGGREGATE

IF 0.8 Q4 ENGINEERING, CIVIL

Advances in Civil and Architectural Engineering Pub Date : 2023-10-18 DOI:10.13167/2023.27.5

Subhakanta Dash, Piyush Gupta, Syed Mohammed Mustakim, Itishree Mohanty

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Abstract

In this paper, two types of lightweight fly ash (FA) aggregates: cold bonded fly ash (CFA) and sintered fly ash (SFA) aggregates were prepared through the cold bonding and sintering method. During the pelletization process, different ratios of binders to fly ash were used, i.e., 10:90, 15:85, 17:83, and 20:80 with a set amount of water. Cement, metakaolin, sodium silicate, urea-formaldehyde resin, bentonite powder, and phenol-formaldehyde resin were employed as binders. A comparative study on physicochemical, mechanical, phase identification, microstructure, and optical analysis of CFA and SFA was performed. The results showed that CFA (an alkali binder) had a higher water absorption (WA) value of 9,50 % with a crushing strength (CS) value of 6,30 MPa than SFA (sodium silicate binder) with a CS value of 5,80 MPa and a WA value of 10,28 %. Experimental observations also demonstrated that the leaching ability of SFA was considerably lower than that of CFA. Most notably, SFA can be used as a substitute for construction material and structural applications along with solving FA waste disposal and related problems to a considerable extent.

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粘结剂、配合比和制备方法对粉煤灰骨料性能的影响

本文采用冷粘接烧结法制备了两种轻质粉煤灰(FA)骨料:冷粘接粉煤灰(CFA)和烧结粉煤灰(SFA)骨料。在成球过程中，采用不同的粘结剂与粉煤灰的比例，即10:90、15:85、17:83和20:80，并添加一定量的水。以水泥、偏高岭土、水玻璃、脲醛树脂、膨润土粉、酚醛树脂为粘结剂。对CFA和SFA的理化、力学、物相鉴定、微观结构和光学分析进行了比较研究。结果表明，碱粘结剂CFA的吸水率为9.50%，破碎强度为6.30 MPa，而水玻璃粘结剂SFA的吸水率为5.80 MPa，破碎强度为10.28%。实验观察还表明，SFA的浸出能力明显低于CFA。最值得注意的是，SFA可以作为建筑材料和结构应用的替代品，并在很大程度上解决FA废物处理和相关问题。

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Advances in Civil and Architectural Engineering

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