Effect of lime neutralization wastewater on the performance of alkali-activated slag/fly ash mortars

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-10-29 DOI:10.1617/s11527-024-02494-9

Tao Zhou, Jin Li

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Abstract

This paper was conducted to upcycle lime-neutralize etching wastewater (LNW), produced from the etching of cenospheres for producing perforated cenospheres, into alkali-activated slag/fly ash, considering the high contents of Ca²⁺ (Calcium ion), Cl⁻ (Chloride ion), and OH⁻ (Hydroxyl). The aim of this study is to limit the discharge of calcium-rich wastewater and minimize the pollution of water and soil resources. To this end, the effects of different LNW content on the fresh properties, hydration products, compressive strength, microstructure and nanomechanical properties of AASF were investigated. Results revealed that the addition of LNW extended the setting times and inhibited the early hydration of AASF due to the existence of Ca²⁺ and NH⁴⁺ (Ammonium) in LNW. In addition, the existence of Ca²⁺ in LNW reacts with NaOH to form Ca(OH)₂, which can work as an auxiliary activator for AASF. Consequently, the LNW-added AASF mortars exhibited denser pore structures and higher compressive strengths. By using 25–100% LNW, the compressive strengths of AASF mortars can be improved by 2.7–18.9% (3d), 4.8–19.5% (7d) and 5.6–19.7% (28d), respectively.

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石灰中和废水对碱活性矿渣/粉煤灰砂浆性能的影响

本文考虑到石灰中和蚀刻废水（LNW）中含有较高的 Ca2+（钙离子）、Cl-（氯离子）和 OH-（羟基），将其循环利用到碱活性炉渣/粉煤灰中。本研究的目的是限制富钙废水的排放，尽量减少对水和土壤资源的污染。为此，研究了不同 LNW 含量对 AASF 的新鲜特性、水化产物、抗压强度、微观结构和纳米力学性能的影响。结果表明，由于 LNW 中存在 Ca2+ 和 NH4+（铵），添加 LNW 会延长 AASF 的凝固时间并抑制其早期水化。此外，LNW 中的 Ca2+ 与 NaOH 反应生成 Ca(OH)2，可作为 AASF 的辅助活化剂。因此，添加了 LNW 的 AASF 砂浆具有更致密的孔隙结构和更高的抗压强度。通过使用 25-100% 的 LNW，AASF 砂浆的抗压强度可分别提高 2.7-18.9%（3d）、4.8-19.5%（7d）和 5.6-19.7%（28d）。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.