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Processed bottom ash for replacing fine aggregate in making high-volume fly ash concrete

机译：加工的底灰可替代高掺量粉煤灰混凝土中的细骨料

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Bottom ash is a coal plant by-product that is abundant and underutilized. There is the potential use of bottom ash as a fine aggregate replacement in concrete mixtures; however, the problems of water absorption and uniformity of quality of the material need to be overcome first. In this study, bottom ash was treated by sieve separation and pounding to smaller particle size for use as a sand substitute. The physical and chemical characteristics of bottom ash were tested after treatment including water absorption, sieve analysis, and fineness modulus. Highvolume fly ash (HVFA) mortar specimens were made and the compressive strength and flowability test using bottom ash after treatment are compared with that of the sand specimen. Low water to cementitious ratio was used to ensure higher strength from the cementitious paste and superplasticizer demand was determined for each treatment. The result showed that bottom ash can be used as fine aggregate replacement material. Sieve separation of the bottom ash could produce 75% of the compressive strength compared with the control sand specimen, whereas pounded bottom ash could have up to 96% of the compressive strength of the control specimen. A 28-day compressive strength of 45 MPa was achievable with 100% replacement of fine aggregate with bottom ash.
机译：底灰是丰富且未充分利用的燃煤厂副产品。底灰可作为混凝土混合物中细骨料的替代品;然而，首先需要克服吸水率和材料质量均匀性的问题。在这项研究中，通过筛分分离和捣碎至较小的粒径来处理底灰，以用作砂的替代品。处理后测试底灰的物理和化学特性，包括吸水率，筛分分析和细度模量。制备了高体积粉煤灰（HVFA）砂浆样品，并将处理后使用底灰的抗压强度和流动性测试与砂样品进行了比较。使用低的水对水泥的比率以确保水泥糊具有更高的强度，并确定每种处理的减水剂需求。结果表明，底灰可作为细骨料的替代材料。与对照砂样相比，筛分底灰的筛分可产生抗压强度的75％，而捣碎的底灰可筛分高达对照样的抗压强度的96％。通过用底灰100％替代细骨料，可实现28天的45 MPa抗压强度。

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