THE IMPACT OF THE TIME WHEN CASTING THE SECOND LAYER OF CONCRETE ON ITS MECHANICAL PROPERTIES | ||
| JES. Journal of Engineering Sciences | ||
| Article 8, Volume 41, No 3, May and June 2013, Pages 919-929 PDF (437.58 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2013.114774 | ||
| Author | ||
| H. A. Mohamadien | ||
| Civil Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt | ||
| Abstract | ||
| Cold joint is one of concreting problem due to delay of casting the second layer. This is due to glitch of one of mechanical machines such as the concrete mixer, concrete truck, concrete batching plants, concrete pumps, and concrete mobile; that cause the stopping of the casting process which produce forced separator. Forced separation is different from known separators like: construction joint, expansion joint and settlement joint, where its location event and shape cannot be determined moreover the design engineer cannot put that in mind during the design phase of building construction. Therefore, the target in this work is to study the effect of delay in time period when casting the second layer of concrete after 4, 9, and 16 hour for two types of concrete with compressive strength 250 kg/cm2 and 300 kg/cm2. Eexperimental work was performed at laboratory to investigate the mechanical properties of concrete (compressive strength, splitting tensile strength and flexural strength), first when sprinkle the first layer with water before casting and second when coated with a grout material.The results were investigated and it indicates that, in case of delaying in the time period for casting the second layer, there is a great effect on the mechanical properties of concrete and the use of grout coating material in forced separation has a positive impact on improving its mechanical properties. | ||
| Keywords | ||
| delay in casting concrete; forced separation; concrete joints | ||
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