Influence of Shrinkage Reduce Agent on Early Age Autogenous Shrinkage of Concrete

Qian, Xiao Qian; Meng, Tao; Zhan, Shu Lin; Fang, Min; Qian, Kuang Liang

doi:10.4028/www.scientific.net/kem.302-303.211

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…However, a steel mold located on the concrete surface can exert frictional resistance on the concrete, which influences the measurement of deformation at early age. Flexible corrugated pipes are used to eliminate it as the stiffness of the axial direction was negligible compared with the stiffness of radial direction and the change in volume was replaced by the change in length [8]. Based on Figure 7, flexible corrugated pipes can be used to replace the steel mould.…”

Section: Automatic Measurement Methods On Concrete Deformation At Ear...mentioning

confidence: 99%

Discussion on Measuring Methods of Deformation of Concrete at early Ages

Liu

Yang

Deng

2014

AMM

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The deformation law of concrete at early age not only affects the shrinkage and cracking of concrete structure in construction, but also further influences its mechanical performance, safety and durability. Based on the existing test methods of cementitious material deformation at early age and aimed at the existing problems, this paper puts forward five kinds of technical solutions to improve the measurement method. Try to use the change in light signals, the electrical signals and leverage-buoyancy method to implement the automatic and continuous deformation monitoring of early-age concrete. Lastly the combination of corrugated pipe, tilt flat base and eddy-current transducer was recommended as the optimal non-contact measurement method for monitoring the deformation of early-age concrete.

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Section: Automatic Measurement Methods On Concrete Deformation At Ear...mentioning

confidence: 99%

Discussion on Measuring Methods of Deformation of Concrete at early Ages

Liu

Yang

Deng

2014

AMM

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“…A study by Montani [64] has shown that using shrinkage reducing admixtures in plain concrete can result in decreasing the drying shrinkage by about 30%. Combining shrinkage reducing admixtures with pulverized fuel ash or slag leads to a reduced early age autogenous shrinkage [65]. Indeed, different water reducers were tested in terms of their influence on the resistance to plastic shrinkage, and all types of water reducer exhibited satisfactory performance.…”

Section: Plain Concrete With Admixturesmentioning

confidence: 99%

Shrinkage Behavior of Conventional and Nonconventional Concrete: A Review

et al. 2020

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Concrete is indeed one of the most consumed construction materials all over the world. In spite of that, its behavior towards absolute volume change is still faced with uncertainties in terms of chemical and physical reactions at different stages of its life span, starting from the early time of hydration process, which depends on various factors including water/cement ratio, concrete proportioning and surrounding environmental conditions. This interest in understanding and defining the different types of shrinkage and the factors impacting each one is driven by the importance of these volumetric variations in determining the concrete permeability, which ultimately controls its durability. Many studies have shown that the total prevention of concrete from undergoing shrinkage is impractical. However, different practices have been used to control various types of shrinkage in concrete and limit its magnitude. This paper provides a detailed review of the major and latest findings regarding concrete shrinkage types, influencing parameters, and their impacts on concrete properties. Also, it discusses the efficiency of the available chemical and mineral admixtures in controlling the shrinkage of concrete.

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“…Published literature [1,2] indicates that different varieties of admixtures have a significant effect on concrete shrinkage rate. The literature [3,4] studied the influence of water reducer on volume stability of concrete, which showed that water reducer could increase the shrinkage of concrete, especially, the greater increase in shrinkage within 24 hours. In this paper, test carried out in accordance with the China Civil Engineering Society standard CCES 01, Durability Design of Concrete Structures and Construction Guidelines, which appendix A "test methods and evaluation of concrete cracking resistance" recommended flat-panel test method [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Varieties of Water Reducing Agent on the Early Cracking of Concrete

Han¹,

Song²,

Xu³

2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. Early cracking performance of concrete incorporating five different varieties of water reduce agent was tested by flat-panel test method and concrete surface cracks were observed within 24hours after pouring of concrete. The results showed that crack resistance of concrete incorporating polycarboxylate-based water reducer (PC) was the best, the anti-cracking grade of concrete was Grade I. Followed by those concrete incorporating resin water reducing agent, melamine (SM), naphthalene-based water reducer and aliphatic water reducer, the anti-cracking grade of concrete were all Grade III. Sodium lignosulfonate had greater impact on the early cracking resistance of concrete, initial cracking time earlier and the number of cracks per unit area of concrete greater within 24h. The anti-cracking grade of concrete with it was Grade IV.

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Influence of Shrinkage Reduce Agent on Early Age Autogenous Shrinkage of Concrete

Cited by 4 publications

References 4 publications

Discussion on Measuring Methods of Deformation of Concrete at early Ages

Discussion on Measuring Methods of Deformation of Concrete at early Ages

Shrinkage Behavior of Conventional and Nonconventional Concrete: A Review

Influence of Different Varieties of Water Reducing Agent on the Early Cracking of Concrete

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