Determination of Required Insulation for Preventing Early-Age Cracking in Mass Concrete Footings

2014 ◽  
Vol 2441 (1) ◽  
pp. 91-97 ◽  
Author(s):  
Tu A. Do ◽  
Adrian M. Lawrence ◽  
Mang Tia ◽  
Michael J. Bergin
Keyword(s):  
Early Age ◽  
Mass Concrete

scholarly journals Complex Effect of Concrete Composition on the Thermo-Mechanical Behaviour of Mass Concrete

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2207 ◽  
Author(s):  
Barbara Klemczak ◽  
Maciej Batog ◽  
Zbigniew Giergiczny ◽  
Aneta Żmij
Keyword(s):  
Fly Ash ◽  
Experimental Tests ◽  
Early Age ◽  
Mass Concrete ◽  
Volume Deformation ◽  
Complex Investigation ◽  
Foundation Slab ◽  
Early Age Concrete ◽  
Composite Cements

The current work presents the complex investigation of the influence of cement and aggregate type on the thermo-mechanical behavior of mass concrete. Six types of cement with different amounts of non-clinker constituents and four types of aggregates are used in experimental tests. Particular attention was given to the low clinker cements with high amounts of siliceous fly ash and ground blast furnace slag. The experimental research covered the determination of thermal, mechanical, and rheological properties of early age concrete with different constituents. Experimental results have been used both to validate the numerical model and analysis of exemplary foundation slab. The results confirm the importance of the concrete mix composition and it has been shown that the early-age volume deformation and possible cracking is the result of the concerted action of thermal and mechanical properties of concrete. The obtained results indicate granite as the best aggregate for mass concrete. Considering the type of cement, much better behaviour of mass concrete has been noted for cements with fly ash and composite cements containing both fly ash and slags than cements only with slag.

Properties of Autogenous Shrinkage in High-Strength Mass Concrete According to Hydration Heat Velocity

2011 ◽  
Vol 311-313 ◽  
pp. 1993-1999
Author(s):  
Kyung Mo Koo ◽  
Gyu Yong Kim ◽  
Hiroyuki Miyauchi ◽  
Yeon Woo Kang
Keyword(s):  
Autogenous Shrinkage ◽  
High Strength ◽  
Hydration Heat ◽  
Early Age ◽  
Mass Concrete ◽  
Close Relationship

The early-age properties and relationships between hydration heat and autogenous shrinkage in high-strength mass concrete are investigated through analysis of the history curves of hydration heat and autogenous shrinkage. To reduce the hydration heat velocity, micro encapsulated retarder (MR) that could retard cement reaction was applied. In the result of research, the hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the reduction of size specimen and use of the retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.

Non-Structural Cracking Analysis of early Age of Reinforcement Concrete Wall

2012 ◽  
Vol 446-449 ◽  
pp. 251-259
Author(s):  
Ting Yao ◽  
Jian Ye Zhang ◽  
Jia Ping Liu ◽  
Qian Tian
Keyword(s):  
Structural Engineering ◽  
Maximum Temperature ◽  
Early Age ◽  
Mass Concrete ◽  
Concrete Wall ◽  
Crack Control ◽  
Leading Role ◽  
Real Behavior ◽  
Unique Source ◽  
Source Of Information

Structure monitoring has been increasingly valuable in recent years and has taken a leading role in the field of structural engineering. Date collected by early age monitoring represent a unique source of information for understanding the real behavior. In this paper, the temperatures evolution and concrete deformation evolution are obtained by real-time continuous monitoring of Reinforcement concrete(RC) wall. The result shows that the early age thermal cracking is one of the most important origin of several phenomena that imperil durability and shorten the lifespan of the structure. Though the wall is not considered as mass concrete, and has a big radiating surface, the maximum temperature can even reach up to 52°C due to heat generation of cement and the insulation of formwork, which can lead to shrinkage deformation when the temperature decreases. The measured experimental date can provide useful reference for early crack control and durability of RC concrete structure, and they can also be use to verify and improve the accuracy of the numerical results for RC wall, which is available in the future for basis to similar projects and research.

Statistical Determination of Cracking Probability for Mass Concrete

2014 ◽  
Vol 26 (9) ◽  
pp. 04014058 ◽  
Author(s):  
Kyle A. Riding ◽  
Jonathan L. Poole ◽  
Anton K. Schindler ◽  
Maria C. G. Juenger ◽  
Kevin J. Folliard
Keyword(s):  
Mass Concrete ◽  
Statistical Determination

scholarly journals Causes of Early-Age Thermal Cracking of Concrete Foundation Slabs and their Reinforcement to Control the Cracking

2017 ◽  
Vol 25 (3) ◽  
pp. 8-14 ◽  
Author(s):  
Juraj Bilčík ◽  
Róbert Sonnenschein ◽  
Natália Gažovičová
Keyword(s):  
Environmental Impact ◽  
Thermal Cracking ◽  
Effect Of Temperature ◽  
Early Age ◽  
Mass Concrete ◽  
Volume Changes ◽  
Interaction Models ◽  
Concrete Foundation ◽  
Temperature Loads ◽  
Crack Widths

Abstract This paper focuses on the causes and consequences of early-age cracking of mass concrete foundation slabs due to restrained volume changes. Considering the importance of water leaking through cracks in terms of the serviceability, durability and environmental impact of watertight concrete structures, emphasis is placed on the effect of temperature loads on foundation slabs. Foundation slabs are usually restrained to some degree externally or internally. To evaluate the effect of external restraints on foundation slabs, friction and interaction models are introduced. The reinforcement of concrete cannot prevent the initiation of cracking, but when cracking has occurred, it may act to reduce the spacing and width of cracks. According to EN 1992-1-1, results of calculating crack widths with local variations included in National Annexes (NAs) vary considerably. A comparison of the required reinforcement areas according to different NAs is presented.

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