Effects of different silica fume dosages on early-age behavior and cracking resistance of high strength concrete under restrained condition

Shen, Dejian; Kang, Jiacheng; Jiao, Yang; Li, Ming; Li, Chengcai

doi:10.1016/j.conbuildmat.2020.120218

Cited by 52 publications

(16 citation statements)

References 77 publications

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“…Early age is an important period in the life cycle of concrete because the tensile strength of concrete at early age is weak 12 . Cracks tend to occur in early‐age concrete when tensile stress overcomes its tensile strength, and moisture as well as aggressive substances can penetrate into the interior of concrete through cracks at early age 13,14 . Several problems of strength and durability may be constituted by cracks 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Effect of water‐to‐cement ratio on internal relative humidity and autogenous shrinkage of early‐age concrete internally cured by superabsorbent polymers

Kang

Shen

et al. 2022

Structural Concrete

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Self‐desiccation is one common phenomenon of concrete with low water‐to‐cement (w/c) ratios, which may lead to the decrease of internal relative humidity (IRH), and therefore causing autogenous shrinkage (AS). Superabsorbent polymers (SAPs) are used as a kind of internal curing material to mitigate AS of concrete. The IRH and AS are significantly affected by the w/c ratio, and several attempts have been made to investigate the IRH or AS of concrete with different w/c ratios. However, the prediction model of AS considering IRH and w/c ratio of internally cured (IC) concrete is limited. In the present study, the effect of w/c ratio on IRH and AS of IC concrete was investigated, and a two‐stage prediction model of AS based on the results of IRH for IC concrete considering the effect of w/c ratio was proposed. The experiment results and analysis indicated that IRH of IC concrete increased as increase of w/c ratio, and development of IRH experienced two stages: a water‐vapor saturated stage with 100% RH (stage I), and a gradually reducing stage in which IRH decreased gradually (stage II); critical time of IC concrete increased as increase of w/c ratio; expansion peak of IC concrete increased as increase of w/c ratio; AS and AS rate of IC concrete decreased as increase of w/c ratio; IRH, critical time, and expansion peak of IC concrete were higher than that of ordinary concrete; AS and AS rate of IC concrete were lower than that of ordinary concrete.

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Section: Introductionmentioning

confidence: 99%

Effect of water‐to‐cement ratio on internal relative humidity and autogenous shrinkage of early‐age concrete internally cured by superabsorbent polymers

Kang

Shen

et al. 2022

Structural Concrete

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“…The early slump of fresh concrete should be increased to improve workability. D.Shen et al [2] investigated the effects of different silica fume dosages (0, 5, 10 and 15% of cement weight) on High Strength Concrete (HSC). The results showed that with increasing SF dosage in HSC, (1) the crack resistance of HSC decreased at an early age; (2) the temperature drop, crack time, crack stress and crack stress to axial tensile strength ratio decreased; (3) the autogenous shrinkage and confined stress rate increased; and (4) the base tensile creep, specific tensile creep and creep-shrinkage ratio increased.…”

Section: Introductionmentioning

confidence: 99%

Compressive, flexural and splitting strength of fly ash and silica fume concrete

Shmlls

Bozsaky

Horváth

2022

Pollack

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Cement replacement materials are commonly used in concrete technology. Several researchers have examined high-performance concrete after adding mineral admixtures to it, but further studies are still needed to provide the optimum dosage of these materials for instance fly ash and silica fume. This study compares three types of concrete and the mechanical properties (compressive strength, flexural strength, and splitting tensile) of these types at the age of 28 and 90 days. The test results designate that adding the mineral admixtures commonly affects the mechanical properties of all the tested types. However, silica fume is more operative than fly ash. Furthermore, adding the fly ash and silica fume in the same concrete type slightly improves the mechanical properties.

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“…4,5 Various methods of curing includes immersion in water, 6 sprinkling, 7 wet coverings, 8 plastic sheet covering, 9 open air curing, 10 and curing with use of chemical admixtures 11 or internal curing with use of natural fibers. 12,13 Many researchers have studied the effect of curing conditions on the strength development and shrinkage of ordinary concrete, 14 high-performance concrete, [15][16][17] lightweight concrete, 18 self-compacting concrete, 19,20 concrete containing supplementary cementitious materials as silica fume, 21,22 fly ash, 23 geopolymers, 24,25 clay, fly ash-clay, or shale ceramsite. 26 The actual concrete curing starts in the moment of compaction -maintaining ambient relative humidity over 90% limits shrinkage deformations to a large extent.…”

Section: Introductionmentioning

confidence: 99%

“…Addition of silica fume in the range of 10%-15% increased the autogenous shrinkage by 33% and 50%. The content of various dosages of silica fume (SF) in concrete was also the subject of research by Shen et al 21 They estimated the degree of cracking resistance of young high strength concrete (HSC) concrete with SF addition and their impact on thermal processes, autogenous shrinkage, restrained stress, and creep. The analysis indicated that, when the SF dosage in the HSC increased the cracking resistance of HSC decreased at early age and the autogenous shrinkage increased.…”

Section: Introductionmentioning

confidence: 99%

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Szlachetka

Witkowska-Dobrev

Dohojda

et al. 2021

Advances in Mechanical Engineering

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The paper presents results of investigations of compressive strength and shrinkage of concrete samples made on the basis of the Portland cement CEM I 32.5R, after 2, 7, 14, 28, 90, and 365 days of maturation in four different maturation conditions. It was shown that after 28 days the samples cured according to the standard in the cuvettes with water achieved the highest compressive strength, although the early-age compressive strengths after 7 and 14 days were lower than those for the samples cured in building film and in dry conditions. A determined correlation between the compressive strength and shrinkage of the concrete proves that wet curing also allows a total elimination of the shrinkage in the first 28 days. Along with the growth of the compressive strength, the drying shrinkage reduces. Obtained results confirmed that the best way of concrete curing, among the analyzed methods, from the point of view of both compressive strength and volume changes is the wet curing.

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Effects of different silica fume dosages on early-age behavior and cracking resistance of high strength concrete under restrained condition

Cited by 52 publications

References 77 publications

Effect of water‐to‐cement ratio on internal relative humidity and autogenous shrinkage of early‐age concrete internally cured by superabsorbent polymers

Effect of water‐to‐cement ratio on internal relative humidity and autogenous shrinkage of early‐age concrete internally cured by superabsorbent polymers

Compressive, flexural and splitting strength of fly ash and silica fume concrete

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

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