Quantification of residual cement paste on recycled concrete aggregates containing limestone by selective dissolution

Macedo, Rafael dos Santos; Ulsen, Carina; Mueller, Anette

doi:10.1016/j.conbuildmat.2019.116875

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…The deionized water dissolution has the carbonation contamination problem. It also takes ten days, which is too long, and the ICP analysis is expensive [30]. For the hydrochloric acid solution method, it cannot be applied for RCA made with limestone, which is soluble in hydrochloric acid [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…Nagataki et al [32] Hydrochloric acid solution method CRCA 5/20 52.3-55% for level 1; 30.2-32.4% for level 3 This method cannot be used for RCA containing limestone aggregates and filler, which are also dissolved by hydrochloric acid. Yagishita et al [31] Hydrochloric acid solution method CRCA 5/10, 10/20 Macedo et al [30] The dissolution method in deionized water (10 days) Simulated 1%, 5%, 10% and 20% hardened cement paste…”

Section: Introductionmentioning

confidence: 99%

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Quantification of the Hardened Cement Paste Content in Fine Recycled Concrete Aggregates by Means of Salicylic Acid Dissolution

et al. 2022

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Adherent hardened cement paste attached to recycled concrete aggregates (RCA) generally presents a higher porosity than natural aggregates, which induces a lower porosity in the properties of RCA. The characterization of the adherent hardened cement paste content (HCPC) in the fine RCA would promote better applications of RCA in concrete, but the determination of HCPC in fine RCA is not well established. A simple method based on salicylic acid dissolution was specifically developed to quantify the HCPC in RCA, especially for RCA containing limestone aggregates. The results demonstrated that the soluble fraction in salicylic acid (SFSA) was equal to the HCPC for white cement and slightly lower for grey Portland cement, which was also confirmed by a theoretical approach using modelling the hydration of cement paste with the chemical equations and the stoichiometric ratios. The physical and mechanical properties of RCA (e.g., water absorption) were strongly correlated to the SFSA. For industrial RCA, SFSA did not give the exact value of HCPC, but it was sufficient to correlate HCPC with the other properties of RCA. The water absorption could be estimated with good accuracy for very fine RCA (laboratory-manufactured RCA or industrial RCA) by extrapolating the relationship between water absorption and HCPC, which is very important for concrete formulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of the Hardened Cement Paste Content in Fine Recycled Concrete Aggregates by Means of Salicylic Acid Dissolution

et al. 2022

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“…The porosity of the mortar matrix is about 1/3 of the maximum porosity of ITZ [ 16 ]. As the residual old mortar was difficult to be removed completely, the higher volume fraction of aggregate was, the larger the weak area would be [ 17 ]; therefore, the replacement rate affected the macro performance of concrete.…”

Section: Introductionmentioning

confidence: 99%

Combined Freeze-Thaw and Chloride Attack Resistance of Concrete Made with Recycled Brick-Concrete Aggregate

Wang

et al. 2021

Materials

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The objective of this study was to investigate the physico-chemical properties of concrete made with recycled brick-concrete aggregate, which was the mixture from waste concrete and waste clay brick in a 7:3 ratio. Specifically, this paper investigated the mechanical properties, freeze-thaw resistance, and distribution of water-soluble chloride ions of concrete containing RBCA and fly ash (FA) against combined freeze-thaw and sodium chloride attack. Concrete containing RBCA replacement of natural coarse aggregate and fly ash replacement of Portland cement was subjected to 45 freeze-thaw cycles containing sodium chloride solution. It was discovered that the mechanical properties and freeze-thaw resistance to sodium chloride attack gradually decreased with increasing RBCA content. At the same time, a replacement level of 15% FA by weight resulted in significant improvements in compressive strength and resistance to combined freeze-thaw and chloride attack. Furthermore, using a replacement of 30% FA by weight markedly improved the resistance to chloride ion penetration of concrete due to the lowest water-soluble chloride content.

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Petrographic method to semi-quantify the content of particles with reactive components and residual mortar in ASR-affected fine recycled concrete aggregates

Locati

Zega

Santos³

et al. 2021

Cement and Concrete Composites

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Quantification of residual cement paste on recycled concrete aggregates containing limestone by selective dissolution

Cited by 5 publications

References 40 publications

Quantification of the Hardened Cement Paste Content in Fine Recycled Concrete Aggregates by Means of Salicylic Acid Dissolution

Quantification of the Hardened Cement Paste Content in Fine Recycled Concrete Aggregates by Means of Salicylic Acid Dissolution

Combined Freeze-Thaw and Chloride Attack Resistance of Concrete Made with Recycled Brick-Concrete Aggregate

Petrographic method to semi-quantify the content of particles with reactive components and residual mortar in ASR-affected fine recycled concrete aggregates

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