KAJIAN KETAHANAN BETON DENGAN TAMBAHAN CAMPURAN FLY ASH DAN LIMBAH KARBIT DALAM MEDIA ASAM DAN GARAM (DURABILITY STUDY OF SELF COMPACTING CONCRETE WITH ADDED A MIXTURE OF FLY ASH AND CALCIUM CARBIDE WASTE IN ACID AND SALT MEDIUM)

Illen Stevani, T. A. Zaharah, I. H. Silalahi
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Abstract

Cement is one of the building blocks of concrete. However, it releases about one ton of carbon dioxide (CO2) gas for every ton of cement produced. Therefore, it is necessary to replace cement in the manufacture of concrete. It is known that a mixture of fly ash and calcium carbide waste has a chemical composition that resembles cement containing silica, alumina, and calcium oxide compounds so that it has the potential to replace cement in making self-compacting concrete. This research was conducted by utilising fly ash waste and carbide waste as additional materials to replace the use of cement by 35% in self compacting concrete. The composition of the waste used in the concrete mix in this study consisted of 25% fly ash waste and 10% calcium carbide waste. Analysis of the elemental composition of self-compacting concrete containing fly ash and calcium carbide waste was obtained from XRF data, the compressive strength of self-compacting concrete samples was tested, their resistance in acid and salt media was studied through the results of compressive strength test analysis, then compared with self-compacting concrete containing 100% cement. The XRF results showed that the elemental composition of the mixture of fly ash, calcium carbide waste, and cement was similar to that of cement alone, but the CaO and SiO2 content of the mixture was still higher than that of cement alone. Based on the compressive strength test analysis results, it was found that the compressive strength values of the self-compacting concrete samples were lower than the compressive strength values of the control of self-compacting concrete samples (cement only). Self-compacting concrete samples soaked in acid and salt media for 28 days showed a decrease in compressive strength, both in self compacting concrete containing a mixture of fly ash, calcium carbide waste, and cement, and concrete containing only cement. The compressive strength values of the fly ash and calcium carbide waste on self-compacting concrete samples in this study were at the range of 28 MPa to 29 MPa, still within the SNI 2847-2019 quality standard, which is the normal concrete quality standard with a compressive force of 15-30 MPa, even though they have been exposed to acid or salt. This allows efforts in replacing cement in self compacting concrete by adding the composition of fly ash waste and calcium carbide waste.
水泥是混凝土的组成材料之一。然而,每生产一吨水泥,就会释放出一吨二氧化碳气体。因此,在混凝土的制造中有必要替代水泥。众所周知,粉煤灰和电石废料的混合物的化学成分类似于含有二氧化硅、氧化铝和氧化钙化合物的水泥,因此它有可能取代水泥制成自密实混凝土。本研究利用粉煤灰废料和碳化石废料作为附加材料,在自密实混凝土中替代35%的水泥用量。本研究中混凝土配合料中使用的废弃物组成为25%的粉煤灰废弃物和10%的电石废弃物。利用XRF数据分析了含粉煤灰和电石废料的自密实混凝土的元素组成,测试了自密实混凝土样品的抗压强度,通过抗压强度试验分析结果研究了自密实混凝土在酸、盐介质中的抗压性能,并与含100%水泥的自密实混凝土进行了对比。XRF结果表明,粉煤灰、电石废弃物和水泥混合料的元素组成与单独水泥相似,但CaO和SiO2含量仍高于单独水泥。通过抗压强度试验分析结果发现,自密实混凝土试样的抗压强度值低于对照自密实混凝土试样(仅限水泥)的抗压强度值。自密实混凝土样品在酸和盐介质中浸泡28天,无论是含有粉煤灰、电石废料和水泥的混合物的自密实混凝土,还是只含有水泥的自密实混凝土,抗压强度都有所下降。本研究粉煤灰和电石废料在自密实混凝土试样上的抗压强度值在28 MPa ~ 29 MPa之间,在SNI 2847-2019质量标准范围内。SNI 2847-2019质量标准是正常的混凝土质量标准,抗压强度为15 ~ 30 MPa,即使它们已经暴露在酸或盐中。这使得在自密实混凝土中加入粉煤灰废料和电石废料的成分来取代水泥成为可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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