Effect of various geopolymerization parameters on poor quality Afşin-Elbistan fly ash-based geopolymer concretes with ground granulated blast furnace slag

IF 2.4 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2024-05-17 DOI:10.1007/s13726-024-01330-9

Ahmet Hayrullah Sevinç, Muhammed Yasin Durgun

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Abstract

The utilization of Afşin-Elbistan fly ash (FA), which cannot be used in cement and concrete industry in production of geopolymers, has been studied with some preliminary trials. In this study, FA of Afşin-Elbistan thermal power plant, which does not fit any of FA classes according to ASTM C 618, was used as a geopolymer binder raw material. The main motivation of the study is to investigate the partial usability of this type of FA, which is not sufficient on its own and creates a large amount of waste, as a geopolymer raw material. FA was replaced with ground granulated blast furnace slag (GGBFS) by the ratios of 25% and 50% (by weights) in order to develop the properties of geopolymer concrete. Sodium silicate (SS) and sodium hydroxide (SH) (10 and 14 M) were used as activators. Three different activator to binder ratios (0.45, 0.55 and 0.65) and three SS/SH ratios (0.75, 1.0 and 1.5) were chosen. Unit weight, compressive strength, splitting tensile strength, and ultrasonic pulse velocity tests were performed for 28 and 60 days. In order to investigate the microstructure, scanning electron microscopy (SEM) analyses were performed. As a result, GGBFS incorporation enhanced the properties of Afşin-Elbistan FA-based geopolymer concrete. With the increase of GGBFS content, the compressive strength values increased. The highest strengths were obtained from 50% GGBFS groups. The results revealed that Afşin-Elbistan FA (AEFA), which has the highest waste reserve among the thermal power plant fly ashes in Turkey, could be evaluated as partial geopolymer raw material.

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各种土工聚合参数对含有磨细高炉矿渣的劣质阿夫辛-伊尔比斯坦粉煤灰基土工聚合物混凝土的影响

阿费辛-埃尔比斯坦粉煤灰（FA）不能用于水泥和混凝土工业，对其在土工聚合物生产中的应用进行了初步研究。在这项研究中，阿费辛-埃尔比斯坦热电厂的粉煤灰被用作土工聚合物粘合剂原料，而根据 ASTM C 618 标准，这种粉煤灰不属于任何一种粉煤灰等级。这项研究的主要动机是调查这类 FA 作为土工聚合物原料的部分可用性，因为这种 FA 本身并不充分，而且会产生大量废物。为了开发土工聚合物混凝土的性能，分别以 25% 和 50% 的比例（按重量计）用磨细高炉矿渣（GGBFS）替代 FA。硅酸钠（SS）和氢氧化钠（SH）（10 M 和 14 M）被用作活化剂。选择了三种不同的活化剂与粘合剂比率（0.45、0.55 和 0.65）和三种 SS/SH 比率（0.75、1.0 和 1.5）。分别进行了 28 天和 60 天的单位重量、抗压强度、劈裂拉伸强度和超声波脉速测试。为了研究微观结构，还进行了扫描电子显微镜（SEM）分析。结果表明，掺入 GGBFS 增强了以阿夫辛-埃尔比斯坦 FA 为基础的土工聚合物混凝土的性能。随着 GGBFS 含量的增加，抗压强度值也随之增加。50％ GGBFS 组的强度最高。研究结果表明，土耳其火电厂粉煤灰中废物储量最高的阿夫申-埃尔比斯坦 FA（AEFA）可作为部分土工聚合物原料进行评估。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.