Rheological properties of sustainable alkali-activated mortars containing soda residue: Mechanisms of soda residue influence and engineering applicability

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-08 DOI:10.1016/j.conbuildmat.2025.143964

Pengyuan Lu , Yekai Yang , Li Wang , Qingxin Zhao , Zhongxian Liu , Chengqing Wu

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Abstract

This study developed a sustainable activation system using soda residue (SR) as the main activator, combined with Na₂SiO₃ (NS) and NaOH (NH). By adjusting the activator content and component ratio, the rheological properties of the alkaline-activated mortar were studied. The study primarily discusses the influence mechanism of SR and the mortar's applicability in different types of concrete. Microscopic analysis showed that hydration products like C/N-A-S-H gel enhance the mortar's internal structure, directly affecting its rheological behavior. Static yield stress (τ_s) increased with activator content, rising by 54.65 % when the ratio of NS:SR:NH= 1:1:1, from A10 to A25. Dynamic yield stress (τ_d) generally increased with the increase in activator content, peaking at 353.81 Pa for A20–121. However, a high NH ratio (A25–112) decreased τ_d due to excess OH^-. The minimum plastic viscosity (μ) was 18.19 Pa·s, higher than cement mortar's 10.53 Pa·s, mainly due to the high viscosity of the activators. The study also found that a high SR content (A20–121) leads to excessive dryness in the mortar, while a high NS content (A20–211) leads to rapid setting, emphasizing the need to balance activator ratios for optimal performance.

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含碱渣碱活化砂浆的流变性能：碱渣影响机理及工程适用性

本研究以碱渣（SR）为主要活化剂，以Na2SiO3 （NS）和NaOH （NH）为主要活化剂，建立了可持续活化体系。通过调节活化剂的含量和配比，研究了碱活化砂浆的流变性能。本研究主要探讨了SR的影响机理及砂浆在不同类型混凝土中的适用性。微观分析表明，C/N-A-S-H凝胶等水化产物增强了砂浆的内部结构，直接影响砂浆的流变行为。静态屈服应力τs随活化剂含量的增加而增大，当NS:SR:NH= 1:1:1时，从A10到A25的静态屈服应力τs增大54.65 %。动态屈服应力τd随活化剂含量的增加而增大，A20-121在353.81 Pa处达到峰值。然而，由于过量的OH-，高NH比（A25-112）降低了τd。最小塑性粘度（μ）为18.19 Pa·s，高于水泥砂浆的10.53 Pa·s，这主要是由于活化剂的高粘度所致。研究还发现，高SR含量（A20-121）会导致砂浆过度干燥，而高NS含量（A20-211）会导致砂浆快速凝固，因此需要平衡活化剂比例以获得最佳性能。

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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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.