Effect of superabsorbent polymer and Slag Cement on concrete properties

Patil, Aniket D.; Kishore, R.; Jadhav, Swaraj; Junead, M.

doi:10.1016/j.matpr.2023.06.037

Cited by 3 publications

(2 citation statements)

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“…The absorption properties of SAPs are influenced by the w/c ratio, superplasticizer, and supplementary cementitious materials, subsequently affecting the rheological properties of cementitious materials with SAP [13]. Higher w/c ratios lead to more excellent SAP absorption, causing more significant changes in Bingham parameters for mixes with SAP [10,13,20]. As SAP content increases, more dosage of water-reducing agent is needed to maintain workability.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Impact of Superabsorbent Polymer Sizes on Absorption and Cement Paste Rheology

Adsul,

Lee,

Kang

2024

Materials

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This study aims to understand the water retention capabilities of Superabsorbent Polymers (SAPs) in different alkaline environments for internal curing and to assess their impact on the rheological properties of cement paste. Therefore, the focus of this paper is on the absorption capacities of two different sizes of polyacrylic-based Superabsorbent Polymers : SAP A, with an average size of 28 µm, and SAP B, with an average size of 80 µm, in various solutions, such as pH 7, pH 11, pH 13, and cement filtrate solution (pH 13.73). Additionally, the study investigates the rheological properties of SAP-modified cement pastes, considering three different water-to-cement (w/c) ratios (0.4, 0.5, and 0.6) and four different dosages of SAPs (0.2%, 0.3%, 0.4%, and 0.5% by weight of cement). The results showed that the absorption capacity of SAP A was higher in all solutions compared to SAP B. However, both SAPs exhibited lower absorption capacity and early desorption in the cement filtrate solution. In contrast to the absorption results in pH 13 and cement filtrate solutions, the rheological properties, including plastic viscosity and yield stress, of the cement paste with a w/c ratio of 0.4 and 0.5, as well as both dry and wet (presoaked) SAPs, were higher than those of the cement paste without SAP, indicating continuous absorption by SAP. The viscosity and yield stress increased over time with increasing SAP dosage. However, in the mixes with a w/c ratio of 0.6, the values of plastic viscosity and yield stress were initially lower for the mixes with dry SAPs compared to the reference mix. Additionally, cement pastes containing wet SAP showed higher viscosity and yield stress compared to the pastes containing dry SAP.

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Section: Introductionmentioning

confidence: 99%

“…As SAP content increases, more dosage of water-reducing agent is needed to maintain workability. However, excess SAP content without additional water or superplasticizer reduces the workability of the cementitious material [20,21]. The method of SAP addition, whether presoaked or dry, significantly affects slump more than particle size.…”

Section: Introductionmentioning

confidence: 99%