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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高吸水聚合物（SAP）对含大体积底灰自密实混凝土抗压强度和裂缝愈合能力的影响

本研究研究了高吸水性聚合物（sap）作为内部养护和裂缝愈合材料在自密实混凝土（SCC）中使用的大量底灰（GBA）。总粘结剂含量为600 kg/m3，水胶比（w/b）为0.27，用火山灰材料代替普通硅酸盐水泥（OPC），其粘结剂重量占比高达70% %。火山灰共混物由大体积的GBA、原粉煤灰（FA）和纳米二氧化硅（NS）组成，重量比分别为70:0:0、60:10:0和58:10:2 （GBA:FA:NS）。此外，采用SAP预吸附和饱和氢氧化钙（Ca(OH) 2）溶液，观察SAP对SCC的裂缝愈合能力。结果表明，SAP在降低高效减水剂用量的同时，显著控制了坍落度流量和T50。然而，SAP含量的增加导致抗压强度的降低。在前两周，在含有0.6-1.8 % SAP（按粘结剂重量计）的SCC混合料中，观察到通过开裂混凝土的水流率降低，养护28天后下降了90% %以上。在含有Ca(OH)2饱和SAP的SCC混合物中，由于额外形成的水合硅酸钙（CSH）凝胶和碳酸钙（CaCO3）沉淀，除了抗压强度略有增加外，水流量降低了98 %。此外，SAP或Ca(OH)2饱和SAP的加入显著降低了SCC中氯离子的渗透。微观结构分析表明，裂纹修复产物包括CSH凝胶和CaCO3沉淀。

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

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.