Effective of alkaline additives on the geopolymer cements properties as alternative to Portland cement in order to protect environment

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Main Group Chemistry Pub Date : 2022-03-03 DOI:10.3233/mgc-210122

Sarvenaz Moradikhou, Hossein Sakhaeinia, A. Alihosseini

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Abstract

Geopolymers are inorganic alumina-silicate materials produced from raw materials, rich in silica (SiO2) and alumina (Al2O3), in combination with an alkaline activator solution. In this study, geopolymer of class C flay ash in ambient curing condition were used form geopolymer mortar and effects of different alkaline activator solutions and variations of associated parameters, were investigated. The obtained results indicated that in ambient curing condition (23±2°C), using sodium hydroxide and sodium silicate as an alkaline activator solution, result in higher 7- and 28-day compressive strength of geopolymer mortar compared to potassium-based (potassium hydroxide and potassium silicate) and combination of sodium and potassium-based alkaline activator solutions, approximately 49% and 145%, respectively. But, in term of 90°C curing condition, potassium-based alkaline activator subject to higher 7- and 28-day compressive strengths. Additionally, simultaneous inclusion of NaOH and KOH led to decline the compressive strength. Also, obtained results of experimental data show that optimal ratio 1.5–2 of SiO2/Na2O were highest compressive strength.

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碱性外加剂对地聚合物水泥性能的影响可以替代硅酸盐水泥，从而达到环保的目的

地聚合物是由富含二氧化硅(SiO2)和氧化铝(Al2O3)的原料与碱性活化剂溶液结合而成的无机铝硅酸盐材料。本研究以常温养护条件下的C类粉煤灰地聚合物为原料制备地聚合物砂浆，考察了不同碱性激发剂溶液及相关参数的变化对地聚合物砂浆性能的影响。结果表明，在常温养护条件下(23±2℃)，使用氢氧化钠和硅酸钠作为碱性活化剂溶液，地聚合物砂浆的7天和28天抗压强度分别比钾基(氢氧化钾和硅酸钾)和钠基和钾基组合的碱性活化剂溶液高约49%和145%。但是，在90℃的养护条件下，钾基碱性活化剂具有更高的7天和28天抗压强度。此外，NaOH和KOH同时夹杂导致抗压强度下降。实验结果表明，SiO2/Na2O的最佳配比为1.5 ~ 2时，抗压强度最高。

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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来源期刊

Main Group Chemistry 化学-化学综合

CiteScore

2.00

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.