Results 211 to 220 of about 24,364 (259)
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Effect of superplasticizers on the plastic shrinkage of concrete
Magazine of Concrete Research, 1992This Paper presents the results of a study on the effect of five different superplasticizers on plastic shrinkage of concrete. Test specimens of fresh concrete were subjected to a simulated hot dry environmental condition of 35°C, 50% RH and a wind velocity of 3·5mls immediately after casting.
J. G. Cabrera +2 more
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Influence of Crumb Rubber on the Drying Shrinkage and Plastic Shrinkage Cracking of AASM
Materials Science Forum, 2013The alkali-activated slag mortar (AASM) has disadvantages of high shrinkage and therefore low crack resistance. In this paper, water quenched raw slag was used to replace sand for making AASM, and effects of crumb rubber on the drying shrinkage and plastic shrinkage cracking of AASM were investigated.
Tao Li, Ya Mei Zhang, Zheng Gui Zhu
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ACI Journal Proceedings, 1968
PLASTIC SHRINKAGE CRACKING OF MORTARS EXPOSED TO DIFFERENT CONDITIONS, AS PREVALENT IN HOT-DRY CLIMATES, WAS INVESTIGATED UNDER CONTROLLED CONDITIONS. THE VARIABLES STUDIED WERE AIR TEMPERATURE AND HUMIDITY, WIND VELOCITY, MORTAR TEMPERATURE, TYPE AND CONTENT OF CEMENT, AND CONSISTENCY.
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PLASTIC SHRINKAGE CRACKING OF MORTARS EXPOSED TO DIFFERENT CONDITIONS, AS PREVALENT IN HOT-DRY CLIMATES, WAS INVESTIGATED UNDER CONTROLLED CONDITIONS. THE VARIABLES STUDIED WERE AIR TEMPERATURE AND HUMIDITY, WIND VELOCITY, MORTAR TEMPERATURE, TYPE AND CONTENT OF CEMENT, AND CONSISTENCY.
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Cement and Concrete Research, 2009
Fresh concrete exposed to high evaporation rates is prone to plastic shrinkage cracking, especially in structures with large surface area/volume ratios. The present work shows that the reduction of the surface tension of the mixing water is an effective way for decreasing such cracking.
José Mora-Ruacho +2 more
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Fresh concrete exposed to high evaporation rates is prone to plastic shrinkage cracking, especially in structures with large surface area/volume ratios. The present work shows that the reduction of the surface tension of the mixing water is an effective way for decreasing such cracking.
José Mora-Ruacho +2 more
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Influence of Shrinkage-Reducing Admixtures on Development of Plastic Shrinkage Cracks
ACI Materials Journal, 2007Cracking that forms between concrete placement and concrete setting is generally described as plastic shrinkage cracking. The authors discuss how concave menisci may form on fresh concrete surfaces due to water evaporation. Potential development of plastic shrinkage cracks may occur when concrete surface tensile stress and concrete settlement develop ...
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The Effectiveness of Shrinkage Reducing Admixture and Fly Ash on Plastic Shrinkage of Concrete
2020Concrete members are normally subjected to service load stresses and deformations. Even in the plastic stage, which is very short, the concrete shrinks and induces cracking. To mitigate the impact of shrinkage in concrete, Shrinkage Reducing Admixtures (SRA) and supplementary cementitious materials can be used in concrete.
Jerison Scariah James, Elson John
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Study on the Effectiveness of Shrinkage Reducing Admixtures on Plastic Shrinkage of Concrete
2019Concrete is plastic for a very short time from being cast to final setting time. But even in this early age, the concrete shrinks and induces cracking. Aiming to mitigate the impact of shrinkage in concrete, shrinkage reducing admixtures can be used in concrete.
E. K. Arya +2 more
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CONCREEP 10, 2015
In recent years there has been a rapid increase in the use of supplementary cementitious materials, such as fly ash and ground granulated blastfurnace slag, for high performance and durable concrete, as well as to reduce clinker requirement. Such materials being fine and not as reactive as cement, increase the setting time and water demand, and reduce ...
Moghul Sirajuddin, Ravindra Gettu
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In recent years there has been a rapid increase in the use of supplementary cementitious materials, such as fly ash and ground granulated blastfurnace slag, for high performance and durable concrete, as well as to reduce clinker requirement. Such materials being fine and not as reactive as cement, increase the setting time and water demand, and reduce ...
Moghul Sirajuddin, Ravindra Gettu
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Plastic Shrinkage Cracking and Evaporation Formulae
ACI Materials Journal, 1998Freshly placed concrete exposed to hot, windy conditions is often prone to plastic shrinkage cracking, though other conditions can also promote this phenomenon. This type of cracking is normally noticed on slabs, pavements, beams, and generally other flat concrete surfaces.
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Plastic shrinkage of steel fibre reinforced concrete
Materials and Structures, 1990The paper presents the results of an experimental investigation on the plastic shrinkage of steel fibre reinforced concrete (SFRC). Tests were carried out on mixes with cement content ranging between 370 and 468 kg m−3. Four types of steel fibres were used: melt extract, hooked, crimped and Harex. The volume of, fibres ranged between 0 and 4.47% of the
P. S. Mangat, M. M. Azari
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