Shear bond strength of patch repair using hybrid alkali-activated binders exposed to H2SO4 and MgSO4 solutions

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

Construction and Building Materials Pub Date : 2025-10-06 DOI:10.1016/j.conbuildmat.2025.143941

Chattarika Phiangphimai , Chirdsakul Lathulee , Sakonwan Hanjitsuwan , Khattiya Chompoovong , Tanakorn Phoo-ngernkham , Witawat Singsang , Prinya Chindaprasirt

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Abstract

This study evaluates the performance of hybrid alkali-activated binders (HAAB), synthesized from high-calcium fly ash (FA) and Portland cement (PC), as alternative patch repair materials for concrete structures exposed to chemically aggressive environments. HAAB mortars were formulated with different FA-to-PC proportions and varying sodium silicate-to-sodium hydroxide (SS/SH) ratios. Slant shear strength tests were performed on repaired specimens before and after immersion in 5 % magnesium sulfate (MgSO₄) and sulfuric acid (H₂SO₄) for 30, 60, and 90 days. Test results showed that HAAB mortars retained 15–25 % higher shear bond strength than commercial repair mortars (CRMs), with the difference being most pronounced under H₂SO₄ exposure. The best performance was achieved with 20 wt% PC replacement and an SS/SH ratio of 1.5, exhibiting bond strength exceeding 9 MPa after 90 days in H₂SO₄, compared to 6.8 MPa for CRM. Life-cycle analysis revealed a 22 % reduction in carbon emissions and a 19 % decrease in material costs for HAAB relative to CRMs. Therefore, these results highlight the promise of FA-PC-based HAAB mortars as sustainable, durable, and cost-effective alternatives for the repair and rehabilitation of concrete structures subjected to chemically aggressive environments.

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暴露于H2SO4和MgSO4溶液中的杂化碱活化粘合剂修补补丁的剪切粘合强度

本研究评估了由高钙粉煤灰（FA）和波特兰水泥（PC）合成的混合型碱活化粘合剂（HAAB）的性能，该粘合剂可作为暴露于化学侵蚀环境中的混凝土结构的替代修补材料。采用不同fa / pc比例和不同硅酸钠/氢氧化钠（SS/SH）比例配制HAAB砂浆。在5 %硫酸镁（MgSO4）和硫酸（H2SO4）中浸泡30、60和90天后，对修复后的试件进行斜剪强度试验。试验结果表明，HAAB砂浆的抗剪强度比商用修复砂浆（CRMs）高15-25 %，其中H2SO4暴露下的差异最为明显。当PC替换率为20% wt%， SS/SH比为1.5时，性能最佳，在H2SO4中90天后的粘接强度超过9 MPa，而CRM的粘接强度为6.8 MPa。生命周期分析显示，与crm相比，HAAB的碳排放量减少了22% %，材料成本降低了19% %。因此，这些结果突出了fa - pc基HAAB砂浆作为可持续、耐用和具有成本效益的替代品的前景，可用于修复受化学侵蚀环境影响的混凝土结构。

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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.