<b>Performance and microstructure characteristics of self-curing self-compacting concrete</b>

Madduru, Sri Rama Chand; Pancharathi, Rathish Kumar; Kumar, Garje Rajesh

doi:10.1680/jadcr.17.00154

Cited by 29 publications

(8 citation statements)

References 34 publications

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“…However, their mixes did not contain any self-curing admixtures. Chand et al [29] examined Grade 70 concrete samples with and without PEG 4000 self-curing admixture. They cured conventional samples in water or air at ambient temperature (27 O C) or at elevated temperature (50 O C), whereas the samples with PEG 4000 were air cured in the two temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of self-curing admixture on concrete properties in hot climate conditions

Rizzuto

Kamal

Elsayad

et al. 2020

Construction and Building Materials

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Highlights• PEG 400 admixture was used in concrete mixes produced for hot weather conditions • Dry materials, mixing water and curing temperatures simulated hot weather • Properties of PEG samples were found to be superior to the control concrete • Results cannot to attributed only to prevention of pore water escape by PEG 400 • A proposal was made to explain the results based on information from the literature ABSTRACT Hot climates prevail in many regions of the globe. The average summer temperature of hot arid areas is in the range of 40-50°C with temperatures exceeding these values under direct solar radiation. Curing concrete in these regions may be challenging due to limited availability of suitable water for curing and/or rapid loss of curing water by evaporation. For many years self-curing admixtures were recommended as an alternative to water curing, however, limited studies have been conducted on their performance in hot weather conditions. In this investigation, the effects of a hot climate on the fresh and hardened properties of self-curing (SC) concrete and normal conventional concrete (NC) in hot weather were studied. A watersoluble polymer self-curing agent, polyethylene glycol (PEG 400), was added to the SC mixes. The testing parameters were concrete dry materials (25 or 50 O C) and/or mix water temperatures (5, 20 or 35 O C) at the time of mixing. NC samples were continuously water cured at 25 or 50 O C, whereas the SC ones were air cured at the same temperatures. The tested properties were workability, compressive strength, splitting tensile strength, and flexural strength. It was found that SC outperformed NC under varying conditions. The results could not be simply attributed to the retention of mix water by the self-curing admixture. A more comprehensive explanation for the observations is proposed.

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Section: Introductionmentioning

confidence: 99%

“…However, Chand el al. [29], Chand et al [21] and Mousa et al [17] did not vary the mix materials temperatures, and hence the fresh concrete temperature, at the time of preparing the mixes, was at laboratory standard conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of self-curing admixture on concrete properties in hot climate conditions

Rizzuto

Kamal

Elsayad

et al. 2020

Construction and Building Materials

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“…The water absorption values of all the samples decrease with an increase of the snail shell powder is observed in Fig 7 . The water absorption values of mix samples reduced from 8.29 -3.53 and 5.12 -2.5 for 7 & 28 days of curing and increased from C35S. The value of water absorption has reduced due to curing and the size of the shell powder [33]. The fineness and specific surface area of shell powder also play a significant role in water absorption because the finer particles settle on the pores and decrease the voids.…”

Section: Water Absorption Testmentioning

confidence: 99%

Experimental Investigation of Snail Shell-Based Cement Mortar: Mechanical Strength, Durability and Microstructure

Alla

Asadi

2021

Preprint

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Snail shells are the discarded bio-shell waste from restaurants, and oceans creating huge environmental problems for society. Living organisms are harmed when these shells are released. As previously stated, the work focuses primarily on the utilisation of snail shell powder as a raw ingredient in cement mortar. The mechanical and durability features of snail shell-based cement mortar were compared to the nominal mortar in this study. Snail shell powder, ranging from 0% to 35%, was used to partially substitute cement in mortar, with a variation of 5%. XRD (X-Ray Diffraction) was used to determine the chemical composition of both mixes. The mechanical properties of mortar for both mixes were determined using a compressive strength test. The tests on cement mortar viz., Water Absorption, Sorptivity, Acid Durability, and Rapid Chloride Permeability Test (RCP Test) were compared with nominal mortar mix. According to the results of the investigation, the optimum use of snail shell powder is 30%. The durability of both mixes increased by the increase of the snail shell powder. To detect the C-S-H gel formations, microstructural analysis was performed for both mixes.

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“…Recent studies have investigated the influence of various external and internal curing techniques on the properties of conventional concrete and SCC [27][28][29]. Water im-mersion is the optimal method, while polyethylene glycol showed promise as a self-curing agent for SCC [30]. However, limited studies compare different curing regimes for multi-blended SCC containing various mineral admixtures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mineral Admixtures and Curing Regimes on Properties of Self-Compacting Concrete

Chava,

M.v.,

Munugala

et al. 2024

Journal of Sustainable Construction Materials and Technologies

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This study investigated the influence of mineral admixtures (fly ash, silica fume, metakaolin) and curing conditions (water immersion, polyethylene glycol, gunny bags, accelerated curing) on the properties of self-compacting concrete (SCC). The rheological properties, compressive strength, chloride penetration resistance, and microstructure were evaluated. Incorporating mineral admixtures improved the workability, strength (up to 53% increase), and durability of SCC compared to plain mixes, with 20% metakaolin replacement being optimal. Water immersion curing enhanced the compressive strength (3-15% increase) and chloride resistance (up to 30% decrease in migration coefficient) owing to improved hydration and microstructural refinement. Mineral admixtures reduced the sensitivity of SCC to curing method. Microstructural analysis showed higher density and additional C-S-H phases with mineral admixtures under wet curing. The study demonstrates that optimized SCC containing appropriate supplementary cementitious materials coupled with proper external curing can achieve high performance.

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Performance and microstructure characteristics of self-curing self-compacting concrete

Cited by 29 publications

References 34 publications

Effect of self-curing admixture on concrete properties in hot climate conditions

Effect of self-curing admixture on concrete properties in hot climate conditions

Experimental Investigation of Snail Shell-Based Cement Mortar: Mechanical Strength, Durability and Microstructure

Effect of Mineral Admixtures and Curing Regimes on Properties of Self-Compacting Concrete

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