Influences of superabsorbent polymer (SAP) on the compressive strength and crack-healing ability of self-compacting concrete containing high-volume ground bottom ash

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2025-01-03 DOI:10.1016/j.cscm.2024.e04196

Siwakorn Chitthawornmanee , Harsimranpreet Kaur , Trinh Nhat Ho Tran , Pattharaphon Chindasiriphan , Pitcha Jongvivatsakul , Weerachart Tangchirapat

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引用次数: 0

Abstract

This study investigated the use of superabsorbent polymers (SAPs) as an internal curing and crack-healing material in self-compacting concrete (SCC) made with high-volume ground bottom ash (GBA). With a total binder content of 600 kg/m³ and a water-to-binder (w/b) ratio of 0.27, ordinary Portland cement (OPC) was replaced with pozzolanic materials by up to 70 % by weight of the binder. The pozzolanic blend comprised high-volume GBA, original fly ash (FA), and nano-silica (NS) in three weight ratios: 70:0:0, 60:10:0, and 58:10:2 (GBA:FA:NS). Additionally, pre-absorption with SAP and a saturated calcium hydroxide (Ca(OH)₂) solution was employed, and the crack-healing ability of SCC with SAP was observed. The results demonstrated that SAP significantly controlled the slump flow and T₅₀ while reducing the required dosage of superplasticizer. However, an increase in SAP content led to a decrease in compressive strength. Reduced water flow rate through the cracked concrete was observed for the first two weeks in SCC mixes containing 0.6–1.8 % of SAP by weight of the binder, decreasing by over 90 % after curing for 28 days. In SCC mixes incorporating SAP saturated with Ca(OH)₂, a 98 % reduction in water flow rate was achieved, in addition to a slight increase in compressive strength, due to the additional formation of calcium-silicate-hydrate (CSH) gels and calcium carbonate (CaCO₃) precipitation. Furthermore, the inclusion of SAP or SAP saturated with Ca(OH)₂ significantly reduced chloride penetration in SCC. Microstructure analysis revealed the presence of crack-healing products including CSH gels and CaCO₃ precipitation.

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.