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How To Avoid Plastic Shrinkage Cracks In Concrete. Erecting Temporary Wind Breaks. To reduce the potential for plastic shrinkage cracking it is important to recog-nize ahead of time before placement when weather conditions conducive to plastic shrinkage cracking will exist. Prevent excessive surface moisture evaporation by providing fog sprays and erecting windbreaks. There are chemical admixtures that may help to reduce the amount of drying shrinkage.
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REPAIR OF PLASTIC SHRINKAGE CRACKS In pre-hardened concrete it is preferable to prevent plastic shrinkage cracking or to identify them while the concrete is still plastic and the surface can be re-worked to close the cracks rather than rely on repair techniques. There are many methods and techniques to prevent this type of crack in case of rapid loss of moisture due to hot weather and dry winds. Some of these are erecting a wind screen cooling the concrete using a fogging system and placing concrete at night. Moisten subgrades and forms to prevent absorption. When the evaporation rates exceed 02 lbft2hr 10 kgm2hr plastic shrinkage cracks are expected. Protect the plaster from sun wind to avoid drying too quickly initiate plastering timing to avoid direct sunlight and strong wind on plastering surface.
The bleeding rate of most concrete mixes is usually less than 02 poundssquare foothour.
These methods include the use of fog nozzles to saturate the air above the surface and using plastic sheeting to cover the surface between the final finishing operations. Higher wind velocities can greatly affect the rate of evaporation of water from the concrete being placed. This paper will present an assessment of some of the available inexpensive equipment that can be used by the contractors field personnel to quickly determine both weather conditions and concrete temperatures. While opinions can vary on acceptable. Plastic shrinkage cracks are unsightly but rarely impair the strength of the structural element. Plastic shrinkage cracks can be prevented provided the contractor properly assessed the weather and the fresh concrete conditions.
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Please consult your local sales representative for information on those products. Shrinkage cracks or settlement cracks. By definition plastic shrinkage cracking occurs while the concrete is still plastic and typically while the slab is still being finished. Surface vibrators can be used to close the. There are many methods and techniques to prevent this type of crack in case of rapid loss of moisture due to hot weather and dry winds.
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Accelerate the setting time of concrete and avoid large temperature differences between concrete and air temperatures. Accelerate the setting time of concrete and avoid large temperature differences between concrete and air temperatures. To reduce the potential for plastic shrinkage cracking it is important to recog-nize ahead of time before placement when weather conditions conducive to plastic shrinkage cracking will exist. It is best to avoid plastic shrinkage cracks forming or to identify that they have formed while the concrete is still plastic and to rework the surface to close the cracks using a wooden float. Cover concrete with wet burlap or polyethylene sheets between finishing operations.
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Accelerate the setting time of concrete and avoid large temperature differences between concrete and air temperatures. Precautionary measures are almost manitory. These cracks are deeper and farther apart and also are caused by drying as surface moisture evaporates. There are chemical admixtures that may help to reduce the amount of drying shrinkage. Please consult your local sales representative for information on those products.
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Moisten subgrades and forms to prevent absorption. Plastic shrinkage cracks can be prevented provided the contractor properly assessed the weather and the fresh concrete conditions. From the free surface. Shrinkage cracks or settlement cracks. However when this occurs precautions as discussed.
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However when this occurs precautions as discussed. Once concrete is in place evaporation can only occur. Resist plastic shrinkage cracking. Protect the plaster from sun wind to avoid drying too quickly initiate plastering timing to avoid direct sunlight and strong wind on plastering surface. There are synthetic fibers that may help control the extent of early drying shrinkage cracks.
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Accelerate the setting time of concrete and avoid large temperature differences between concrete and air temperatures. Guidelines to Avoid Plastic Shrinkage Cracks. Plastic shrinkage occurs when water evaporates from the surface at a higher rate than the bleeding rate. By definition plastic shrinkage cracking occurs while the concrete is still plastic and typically while the slab is still being finished. There are chemical admixtures that may help to reduce the amount of drying shrinkage.
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Cover concrete with wet burlap or polyethylene sheets between finishing operations. There are chemical admixtures that may help to reduce the amount of drying shrinkage. Higher wind velocities can greatly affect the rate of evaporation of water from the concrete being placed. If plastic shrinkage cracks should appear during final fin-ishing the finisher may be able to close them by refinish-ing. This paper will present an assessment of some of the available inexpensive equipment that can be used by the contractors field personnel to quickly determine both weather conditions and concrete temperatures.
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Some of these are erecting a wind screen cooling the concrete using a fogging system and placing concrete at night. By definition plastic shrinkage cracking occurs while the concrete is still plastic and typically while the slab is still being finished. Plastic shrinkage occurs when water evaporates from the surface at a higher rate than the bleeding rate. Synthetic fibers can help prevent plastic shrinkage cracking as can fogging to reduce evaporation. Precautionary measures are almost manitory.
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Cover concrete with wet burlap or polyethylene sheets between finishing operations. When the evaporation rates exceed 02 lbft2hr 10 kgm2hr plastic shrinkage cracks are expected. Erecting Temporary Wind Breaks. In the absence of appropriate precautions and in unfavourable drying conditions the rate of evaporation at the surface can be greater than the rate with which water within the concrete can migrate to. While not indicative of immediate problems with durability cracks raise concerns about quality and can cause problems for long-term durability.
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While not indicative of immediate problems with durability cracks raise concerns about quality and can cause problems for long-term durability. By definition plastic shrinkage cracking occurs while the concrete is still plastic and typically while the slab is still being finished. Although plastic shrinkage cracks usually do not impair the structural performance of the slab cracks in some building floors have been blamed for leakage. The bleeding rate of most concrete mixes is usually less than 02 poundssquare foothour. Attempts to eliminate plastic shrinkage cracking by modifying the composition to affect bleeding charac-teristics of a concrete mixture have not been found to be consistently effective.
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Saturate the masonry wall adequately with water before plastering. Once concrete is in place evaporation can only occur. Accelerate the setting time of concrete and avoid large temperature differences between concrete and air temperatures. Plastic shrinkage cracks can be prevented provided the contractor properly assessed the weather and the fresh concrete conditions. In the absence of appropriate precautions and in unfavourable drying conditions the rate of evaporation at the surface can be greater than the rate with which water within the concrete can migrate to.
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It is best to avoid plastic shrinkage cracks forming or to identify that they have formed while the concrete is still plastic and to rework the surface to close the cracks using a wooden float. REPAIR OF PLASTIC SHRINKAGE CRACKS In pre-hardened concrete it is preferable to prevent plastic shrinkage cracking or to identify them while the concrete is still plastic and the surface can be re-worked to close the cracks rather than rely on repair techniques. Higher wind velocities can greatly affect the rate of evaporation of water from the concrete being placed. Dampen the subgrade and forms when conditions for high evaporation rates exist. From the free surface.
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Plastic shrinkage cracks can form in the concretes surface in the first few hours after placement. REPAIR OF PLASTIC SHRINKAGE CRACKS In pre-hardened concrete it is preferable to prevent plastic shrinkage cracking or to identify them while the concrete is still plastic and the surface can be re-worked to close the cracks rather than rely on repair techniques. Saturate the masonry wall adequately with water before plastering. The bleeding rate of most concrete mixes is usually less than 02 poundssquare foothour. To reduce the potential for plastic shrinkage cracking it is important to recog-nize ahead of time before placement when weather conditions conducive to plastic shrinkage cracking will exist.
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Synthetic fibers can help prevent plastic shrinkage cracking as can fogging to reduce evaporation. Although plastic shrinkage cracks usually do not impair the structural performance of the slab cracks in some building floors have been blamed for leakage. Moisten subgrades and forms to prevent absorption. Plastic shrinkage cracks can form in the concretes surface in the first few hours after placement. How to Prevent Plastic Shrinkage Cracking of Concrete.
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There are several corrective procedures listed below to reduce the risk of experiencing plastic shrinkage cracks. Dampen the subgrade and forms when conditions for high evaporation rates exist. Once concrete is in place evaporation can only occur. Please consult your local sales representative for information on those products. Resist plastic shrinkage cracking.
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