Early age cracking of self-compacting concrete

Lövgren, Ingemar; Esping, Oskar

doi:10.1617/2351580052.027

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…Therefore, the cracks in the REFS seem to be partly autogenous, which complies well with the results of Esping and Löfgren [10].…”

Section: Influence Of Cement Typesupporting

confidence: 90%

“…The ambient temperature and the relative humidity were 20 ± 1˚C and 35 ± 3%, respectively. [10] (the dimensions are in mm).…”

Section: Methodsmentioning

confidence: 99%

“…The influence of different parameters on the risk of plastic shrinkage cracking has been investigated by a number of researchers. For example, Löfgren and Esping [10] found that the optimum w/c ratio for decreasing the plastic shrinkage cracking tendency of SCC is 0.55. Same authors also observed that increasing the cement content or decreasing w/c ratio increases the autogenous shrinkage [4].…”

Section: Introductionmentioning

confidence: 99%

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Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Sayahi

Emborg²,

Hedlund

et al. 2019

Nordic Concrete Research

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This research investigates the effect of capillary pressure and the length of the hydration dormant period on the plastic shrinkage cracking tendency of SCC by studying specimens produced with different w/c ratios, cement types and SP dosages. A relationship between the capillary pressure rate and the length of the hydration dormant period is defined, which can explain the cracking severity of the concrete when the volumetric deformation is unknown. The results show, that the cracking tendency of SCC was the lowest in case of w/c ratio between 0.45 and 0.55, finer and more rapid hardening cement, and lower dosage of SP. The dormant period was prolonged by increasing the w/c ratio, using coarser cement, and higher SP dosage. It was concluded that the cracking tendency of concrete is a function of the capillary pressure buildup rate and the length of the dormant period.

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“…Therefore, the cracks in the REFS seem to be partly autogenous, which complies well with the results of Esping and Löfgren [10].…”

Section: Influence Of Cement Typesupporting

confidence: 90%

“…The ambient temperature and the relative humidity were 20 ± 1˚C and 35 ± 3%, respectively. [10] (the dimensions are in mm).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Sayahi

Emborg²,

Hedlund

et al. 2019

Nordic Concrete Research

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“…Moreover, the difference recorded in the width of cracks between the two concrete types can be attributed to the fluid consistency and the rheology of materials. This result was the conclusion of many authors like Löfgren and et al [12]. Thus, the use of SCC in a severe climate demands a fewer requirements in terms of compressive strength and more rheological characteristics in order to minimize the cracked area.…”

Section: Severe Climate Conditionssupporting

confidence: 63%

“…[7] Although many authors argue that, there is no significant difference between behaviour of two concretes towards shrinkage at early age. [11,12] Turcry states that plastic shrinkage of SCC can be greater in less severe conditions, but in the presence of wind, OC exhibits almost the same value of plastic shrinkage as that of SCC. [13] The important SCC paste volume, which represents the major distinction with an OC, can explain this occurrence.…”

Section: Introductionmentioning

confidence: 99%

The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather

Yakoubi

Aggoun

Aider

et al. 2016

Journal of Adhesion Science and Technology

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a laboratory of experimental and numerical Modelling of Materials and structures in civil engineering (laMoMs), university Mouloud Mammeri of Tizi ouzou, Tizi ouzou, algeria; b l2Mgc, cergy-Pontoise university, cergy-Pontoise, france; c laboratory of Materials and durability of constructions (lMdc), university Mentouri of constantine, constantine, algeria ABSTRACT Self-compacting concrete (SCC) is a new material able to be put in place without vibration. However, this advantage is offset by some drawbacks, such as plastic shrinkage, one of the causes of cracking in concrete. Furthermore, the presence of fines absorbs a large amount of water and therefore minimizes bleeding. This paper endeavours to provide a better understanding of the appearance of plastic shrinkage cracking, and to justify his relation with bleeding phenomena. Five SCC formulas with different W/C ratios were prepared and compared to the same range of ordinary concrete (OC) in terms of restrained shrinkage (cracking width). At the same time, a study of cracks' propagation over time (cracking length) was conducted on the equivalent mortars (mOCe, mSCCe). Mixtures were placed in different hot environmental conditions. The results showed that bleeding significantly reduces cracking length and has no effect on cracking width. In the second part, extra water and superplasticizer was proposed as a solution to prevent SCC cracking and findings show the addition of 10% of water reduces cracking length and a slightly lower addition of superplasticizer reduces SCC's crack width.

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