PERFORMANCE OF TERNARY CEMENT MORTAR USING STEEL SLAG, FLY ASH, AND METAKAOLIN

Q4 Earth and Planetary Sciences

ASEAN Engineering Journal Pub Date : 2023-05-31 DOI:10.11113/aej.v13.18989

Ola T. Kader, Eethar T. Dawood

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Abstract

Green mortar is a mortar that is environmentally friendly and that uses waste materials or by-products to reduce CO2 emissions that are produced during cement production. This study aims to produce a new type of green mortar by using ternary cement mixes with acceptable fresh and hardened properties. The materials used were metakaolin (10-20%), slag (15-30%), and fly ash (10-20%). The experimental work was divided into two steps. Firstly, metakaolin was replaced with various percentages of 10%, 15%, and 20%, and then the optimum percentage having the highest compressive strength was chosen to use in ternary mixes. Secondly, cement was replaced with a ternary mix (slag, fly ash, and metakaolin) with a replacement ratio of 40% and 50%. Properties were studied flowability, compressive strength, flexural strength, water absorption, dry density, ultra-sonic plus velocity test, The results show that using metakaolin as a partial replacement for cement decreased flowability and increased superplasticizer dosage. From the results can conclude the use of ternary mixes decreased the workability of mixes and increased the dosage of superplasticizers to 1.8% at 50% replacement of cement. The results of compressive strength showed an increase of 50.6% after replacing 10% metakaolin at 7 days and 17.35% after replacing ternary mixes with 15% slag, 15% fly ash, and 10% metakaolin, while flexural strength increased by 26.47% after replacing the same percent of metakaolin and by 10.4% after replacing a ternary mix with the same percent of materials. The results show that using 10% metakaolin decreased water absorption by 28.75% while increasing slag increased water absorption in ternary mixes. The results for dry density slightly decreased or increased with the increased replacement of ternary cement mixes from 1.2% to 0.33% compared with the control mix. The UPV test result increased by 5.4% in ternary cement mixes, and when replacing metakaolin with 10% and 15%, it increased UPV by 5.7% and 5.2%, respectively, at 28 days.

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钢渣、粉煤灰、偏高岭土三元水泥砂浆性能研究

绿色砂浆是一种环境友好型砂浆，它使用废料或副产品来减少水泥生产过程中产生的二氧化碳排放。本研究旨在通过使用具有可接受的新鲜和硬化性能的三元水泥混合物来生产一种新型绿色砂浆。所用材料为偏高岭土(10-20%)、矿渣(15-30%)、粉煤灰(10-20%)。实验工作分为两个步骤。首先用10%、15%、20%的不同比例替代偏高岭土，然后选择抗压强度最高的最佳比例用于三元混合料中。其次，用矿渣、粉煤灰和偏高岭土三元混合料替代水泥，替代率分别为40%和50%。研究了偏高岭土的流动性、抗压强度、抗弯强度、吸水率、干密度、超声加速等性能，结果表明，偏高岭土部分替代水泥会降低其流动性，增加高效减水剂用量。结果表明，三元混合料的使用降低了混合料的和易性，在水泥替代量为50%时，高效减水剂的用量增加至1.8%。结果表明，更换10%偏高岭土7 d后抗压强度提高50.6%，更换15%矿渣、15%粉煤灰、10%偏高岭土的三元混合料7 d后抗压强度提高17.35%，更换相同比例的偏高岭土和相同比例的三元混合料7 d后抗折强度提高26.47%，更换相同比例的材料后抗折强度提高10.4%。结果表明:添加10%偏高岭土可使三元混合料的吸水率降低28.75%，而添加矿渣可使三元混合料的吸水率提高;与对照水泥相比，随着三元水泥掺量从1.2%增加到0.33%，干密度略有下降或增加。三元水泥混合料的UPV测试结果提高了5.4%，当偏高岭土添加量为10%和15%时，28天UPV分别提高了5.7%和5.2%。

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来源期刊

ASEAN Engineering Journal Engineering-Engineering (all)

CiteScore

0.60

自引率

0.00%

发文量