Concrete Technology

Concrete Trial Mix

Concrete Trial Mix The calculated mix proportions shall be checked by means of trial batches. Trial Mix No. 1 Workability of the Trial Mix No. 1 shall be measured. The mix shall be carefully observed for freedom from segregation and…
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Sprayed Concrete Admixtures and the Process

Sprayed Concrete Admixtures and the Process Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity used for rabid construction.The applications are frequently vertical or overhead and this requires rapid stiffening if slumping or loss…
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General Specifications of Cement Concrete Work In Building

General Specifications of Cement Concrete Work In Building All concreting, especially cement concrete work, is a specialized task in respect of bringing out quality: finish, strength, and leak-proof performance. Cement Concrete Cement concrete work can be categorized (for separate measurements…
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Protection of Newly Placed Concrete Curing Time

Protection of Newly Placed Concrete Curing Time Newly placed Concrete Curing Time in the initial stages of setting(up to 12-24 hrs.) should be protected by approved means from frost, mist-, rain and drying winds. Exposed faces of concrete shall_be kept…
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Finished Concrete Works and Workability of Concrete

Finished Concrete Works and Workability of Concrete Finished Concrete Works Check and inspect after stripping of formwork for defects such as; Honeycombing Porous concrete and voids Exposure of reinforcement Poor joints Inadequate cover to reinforcement Curing of Concrete Prevention of…
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Assessing the Quality and Quantity of Cement

Assessing the Quality and Quantity of Cement 1.Colour of the cement should be uniform and grey for 0rdinary Portland. Cement(OPC) and blackish in case of Portland Pozzolana Cement(PPC). 2.When rubbed between fingers, it should be felt like flour. If found…
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Factors Affecting Failures in Concrete Structure

Factors Affecting Failures in Concrete Structure Failures in concrete structures can be due to any of the following factors: 1. incorrect selection of materials 2. errors in design calculations and detailing 3. poor construction methods and inadequate quality control and…
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