Creep and Shrinkage of SCC

Leemann, Andreas; Lura, Pietro

doi:10.1007/978-3-319-03245-0_3

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…They concluded that SCC with a w/c ratio lower than 0.4, most probably, cracks due to autogenous shrinkage, rather than plastic shrinkage. Other experiments also showed that the risk of plastic shrinkage cracking of SCC significantly decreases when w/b ratio is below 0.44 [11]. Furthermore, it has been observed that a normal hardening cement boosts the cracking tendency of SCC in comparison to a rapid hardening cement [4].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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 trend seems to apply to all testing ages. Since the shrinkage sources come mainly from the cement paste, for the same cement paste mix proportion, the higher the cement paste content, the larger the deformation that can be expected [ 11 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, due to the high content of powders in SCC mix proportion, the ensuing problems are high hydration heat generated during setting and high autogenous deformation compared to the traditional vibrating concrete [ 6 , 7 , 8 , 9 ]. These facts could increase the stress gradient inside of the concrete elements and increase the risk of cracking and failure of the structures [ 6 , 9 , 10 , 11 ]. In addition, excessive use of the cementitious materials can lead to an increase of carbon footprint and be harmful to the environment [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

Zhang

Zuo

et al. 2020

Materials

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The current study aims at proposing a novel and simple method for designing fluid concrete such as self-compacting concrete (SCC) with a low cementitious binder content to reduce the carbon footprint. Different testing methods regarding the packing density of aggregate mixtures are performed and compared. The W/C was determined according to the target compression strength. Slump flow spread is carried out to determine the most appropriate superplasticizer (SP) dosage and aggregate volume fractions and proportions in concrete mixtures. Furthermore, hardened performance, including compression strength and drying shrinkage of the fluid concrete, are characterized. Finally, a mix design process of fluid concrete with low cement content was proposed based on the preferred fresh and hardened properties of the concrete mixtures.

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“…The water loss in the pores of slurry caused by cement hydration and drying will lead to the shrinkage of concrete, 138,139 so it is generally believed that slurry shrinkage is the main cause of concrete cracking, and aggregate plays a role in inhibiting slurry shrinkage. However, due to the large volume of slurry and low aggregate content in SCC, its shrinkage is larger than ordinary vibrated concrete 131–133 . It has been found that the early shrinkage of SCC containing NS is higher than that of the control group, mainly because NS accelerated the hydration reaction 105 .…”

Section: Durability Of Scc Containing Nsmentioning

confidence: 99%

“…However, due to the large volume of slurry and low aggregate content in SCC, its shrinkage is larger than ordinary vibrated concrete. [131][132][133] It has been found that the early shrinkage of SCC containing NS is higher than that of the control group, mainly because NS accelerated the hydration reaction. 105 The study by Almohammadalbakkar et al 134 developed a prediction model for the degree of shrinkage of SCC containing NS based on the ACI 209 R-92 135 model that predicts shrinkage of conventional concrete and the experimental results.…”

Section: Shrinkagementioning

confidence: 99%

Recent developments in utilization of nano silica in self‐compacting concrete: A review

Wang

Yang

Chu

et al. 2023

Structural Concrete

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Self‐compacting concrete (SCC) is a type of flowable, high‐strength and high‐performance concrete in the construction field, which can flow and compact under its own weight. The damage of concrete is often caused by internal microstructural defects. Nano silica (NS) has excellent pozzolanic properties, and with an appropriate content of NS as auxiliary cementing material, it can promote the generation of C‐S‐H gels in addition to serve as internal filler, thus improves the micro‐scale defects in concrete. This paper extracts data from studies published over the last decade which focus on the application of NS in SCC and discusses the similarities and differences between the studies. Ultimately, a systematic review of the physical and chemical characteristics of NS, and the effect of NS on the workability, mechanical and durability properties of SCC is presented. Based on the review, the most common NS content is 0%–6%, where the negative effect of 0%–6% NS on the workability of SCC can be controlled by increasing the dosage of superplasticizer. The NS content of 2%–3% is optimum for improving the mechanical strength and the ability of SCC to resist water permeability, corrosion, acid and sulfate attacks, elevated temperature as well as shrinkage.

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Creep and Shrinkage of SCC

Cited by 10 publications

References 24 publications

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

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

A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

Recent developments in utilization of nano silica in self‐compacting concrete: A review

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