Time-zero and deformational characteristics of high performance concrete with and without superabsorbent polymers at early ages

Li, Liang; Dabarera, Arosha; Dao, Vinh

doi:10.1016/j.conbuildmat.2020.120262

Cited by 34 publications

(22 citation statements)

References 47 publications

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“…SAPs are a type of hydrogel formed by cross-linking of water-soluble polymers, and they can absorb water equivalent to hundreds of times of their own weight from the surrounding environment [10]. Li et al [11] added SAP in cement; the autogenous shrinkage of cement decreased with increasing SAP content. Wang et al [12] found that adding 0.05-0.1% SAPs to alkalized active slag mortar reduced autogenous shrinkage by 4-6 times.…”

Section: Introductionmentioning

confidence: 99%

Improving Self-Healing and Shrinkage Reduction of Cementitious Materials Using Water-Absorbing Polymer Microcapsules

Mao

Chen

et al. 2022

Materials

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Self-healing cementitious materials are a promising means for ensuring sustainable concrete infrastructure and promoting long-term service lives. To obtain microcapsules that are versatile in varying environments, in this study, absorbing microcapsules with calcium alginate as the shell and epoxy resin as the core were prepared. The absorbing microcapsules exhibit self-healing and can reduce the shrinkage of cementitious materials. Volume changes of the microcapsules in the hardened paste with increasing hydration age were observed using three-dimensional X-ray computed tomography. In the hardened cement paste with a water-cement ratio of 0.29, the absorption of the microcapsules lasted for several days, and the release of water lasted for 28 days. The absorption of microcapsules affected the fluidity of cement paste, and it was significantly weakened and delayed due to the lower absorption rate. The addition of absorbing microcapsules significantly reduced the autogenous and drying shrinkage of mortars. For microcapsules with a core content of 55% added at 3.5% of cement weight, autogenous shrinkage was almost eliminated. Most importantly, the addition of absorbing microcapsules could achieve a certain degree of recovery of compressive strength as well as satisfactory recovery of impermeability in dry and wet environments.

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Section: Introductionmentioning

confidence: 99%

Improving Self-Healing and Shrinkage Reduction of Cementitious Materials Using Water-Absorbing Polymer Microcapsules

Mao

Chen

et al. 2022

Materials

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“…This shrinkage stops when a stable skeleton is formed inside concrete, i.e. approximately 24 h after its manufacture [7]. This moment is known as "time zero" [8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Revilla‐Cuesta

Evangelista

Brito

et al. 2022

Construction and Building Materials

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“…However, the extremely low porosity (very low permeability) of UHPC makes it impossible for water from outside to enter [ 6 ]. UHPC was found to be more suitable than the internal curing method for maintenance [ 9 ]. Internal curing is the process of mixing and dispersing materials with high water absorption capacity into concrete and gradually releasing water to the surrounding area during the cement’s hydration process [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Internal curing is the process of mixing and dispersing materials with high water absorption capacity into concrete and gradually releasing water to the surrounding area during the cement's hydration process [10]. Common internal curing methods are lightweight aggregates (LWA) [11] and SAP [9]. The water absorption ability of SAP is much higher than LWA; consequently, the internal curing efficiency of SAP is higher [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Xuan

Wang

et al. 2021

Materials

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This study focuses on the effects of superabsorbent polymers (SAP) and belite-rich Portland cement (BPC) on the compressive strength, autogenous shrinkage (AS), and micro- and macroscopic performance of sustainable, ultra-high-performance paste (SUHPP). Several experimental studies were conducted, including compressive strength, AS, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance (ATR)–Fourier-transform infrared spectroscopy (FTIR), ultra-sonic pulse velocity (UPV), and electrical resistivity. The following conclusions can be made based on the experimental results: (1) a small amount of SAP has a strength promotion effect during the first 3 days, while BPC can significantly improve the strength over the following 28 days. (2) SAP slows down the internal relative humidity reduction and effectively reduces the development of AS. BPC specimens show a lower AS than other specimens. The AS shows a linear relationship with the internal relative humidity. (3) Specimens with SAP possess higher cumulative hydration heat than control specimens. The slow hydration rate in the BPC effectively reduces the exothermic heat. (4) With the increase in SAP, the calcium hydroxide (CH) and combined water content increases, and SAP thus improves the effect on cement hydration. The contents of CH and combined water in BPC specimens are lower than those in the ordinary Portland cement (OPC) specimen. (5) All samples display rapid hydration of the cement in the first 3 days, with a high rate of UPV development. Strength is an exponential function of UPVs. (6) The electrical resistivity is reduced due to the increase in porosity caused by the release of water from SAP. From 3 to 28 days, BPC specimens show a greater increment in electrical resistivity than other specimens.

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Time-zero and deformational characteristics of high performance concrete with and without superabsorbent polymers at early ages

Cited by 34 publications

References 47 publications

Improving Self-Healing and Shrinkage Reduction of Cementitious Materials Using Water-Absorbing Polymer Microcapsules

Improving Self-Healing and Shrinkage Reduction of Cementitious Materials Using Water-Absorbing Polymer Microcapsules

Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

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