The process of pouring concrete is extremely important because it decide the concrete quality. Engineers ensure quality consultant should have a permanent presence to witness the work of the contractor.
The height of free fall of concrete shall not exceed 1.5 meters to avoid stratification. If height exceeding 1.5 meters free fall, the concrete was poured through rough or tube sliding canvas, elephant pipe.
When pouring concrete, there has to have people take care to prevent uncertainties and risks.
When used vehicles cause greater stress on local or encasements create a strong impulse, the contractor must check calculations and consulting engineers ensure required quality checks and give the contrctor to approve.
Construction process to prevent rain and preparation means if rain shield. Under construction is not rain, but construction continued to wait for the concrete strength reaches 25 daN/cm2 (weather 25oC, about 24 hours) to new construction. For this reason when pouring concrete, dividing the concrete area should be selected to coincide with the suspension circuit. When enough strength to continue construction, adjacent clean, if necessary, opaque neighbors, get the cement paste and Sikagrout (1:1) to place basting constantly butt slit with a thickness of about 5mm between pasted materials layer of concrete and new concrete poured. When the dress should pay attention not cut into the concrete beams were poured and watch for new concrete pour enough flow smoothing circuitry.
Thickness of each layer should pour 2/3 the depth of the impact compactor. Do not dress up reinforcing spleen and not the impact of the dress makes concrete horizontal shift.
Do not place too long dress that just has density, ie dress to the concrete surface water cement incipient appearance. Dam will cause too long a stratified place concrete.
When large concrete blocks (temporary rules that have textures that area> 10m2, Structure height> 0.8 m) shed each layer should be about 30 cm and wait for concrete running out of time to pour fresh continue to avoid the appearance of cracks caused by thermal stress.
On the surface of newly poured concrete structures should be repaired by rolling and rubbing by float plane. If you need special handling the design must have its own instructions. from the concussion. This measure must be established separately measures as directed by the experts.
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