Detailed methods for slump test to check the consistency of fresh concrete

This construction video briefly explains the importance of Slum Test and how it is used to examine the workability and conformity of fresh concrete.

The term ‘Slump’ can be defined as following two ways :-
1. A measurement of workability or fluidity of concrete
2. An indirect measurement of the conformity or rigidity of the concrete

Slump Test refers to the way of availing the conformity and & workability of fresh concrete. It is also utilized indirectly as a way of verifying whether exact amount of water is added to the concrete mix or not.

The test computes consistency of concrete in that particular batch. Consistency means the smoothness with which concrete flows. It is utilized to specify degree of wetness.

It belongs to the physical specifications of concrete that can impact the finesse, strength and durability.

ASTM C143 - Standard Test Method for Slump of Hydraulic-Cement Concrete.

It stands for a test necessary for passing the American Concrete Institute (ACI) Field Technician Certification Program -- "Concrete Field Testing Technician—Grade I."

A Concrete Field Testing Technician—Grade I refers to an individual who has validated the knowledge and capacity to properly execute and record the results originated from seven basic field tests on freshly mixed concrete.

The program needs a working knowledge of the various ASTM test methods and practices which are described below:

• C1064/C1064M - Temperature of Freshly Mixed Hydraulic-Cement Concrete
• C172 - Sampling Freshly Mixed Concrete
• C143/C143M - Slump of Hydraulic-Cement Concrete
• C138/C138M - Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete
• C231 - Air Content of Freshly Mixed Concrete by the Pressure Method
• C173/C173M - Air Content of Freshly Mixed Concrete by the Volumetric Method

Watch the following video to view the detailed slum test process.

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Published By

Rajib Dey

www.constructioncost.co

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How To Resist Cracking In Fresh Concrete

Usually, the contractor should take responsibility with all essential steps to track and resist cracking in fresh hydrating concrete, devoid of the size or volume of the pour. The steps should be approved by the Engineer and ensure that extreme surface crack width on hardened concrete measure instantly after the pour does not surpass 0.004 times the nominal cover of the primary reinforcement.

The contractor will be responsible for and offer sanctioned instrumentation for measuring the variation of internal temperature in large pours. The extreme concrete temperature at the point of delivery usually shall not surpass the lower of either 37 degree C, or 6 degree C beyond the existing shade temperature compliant with the approvals of ACI. The limiting internal temperature differential measured over the maximum faces of concrete mass shall not go above 25 degrees C at any time.

Curing of hardened concrete will be done according to the curing specification. Usually, the element surface is not chilled to disperse heat from the concrete. Curing methods, like the drenching of heated concrete elements uncovered to long and direct radiation, which produce temperature gradients inside the concrete mass, are not recommended for application.

For big pours, the contractor will be liable for and take additional provisions to lessen concrete temperature gradient as well as check the loss of surface moisture. Such steps are described below :-

 Maintaining all mix ingredients shaded where feasible to decrease their temperatures in         the stockpile

 Chilling of mixing water and/or substituting part or entire of the extra water with ice.

 Lessening the cement content with the application of admixtures (but not lower that is           essential for the stability)

 Applying a cement having a inferior heat of hydration

 Injecting liquid nitrogen once the concrete is blended

 Limiting the time amid mixing and assigning of the concrete to below 2 hours

 Delivering permitted surface insulation constantly over all uncovered surfaces to resist           draughts as well as keep identical temperature with the concrete mass

 Starting curing instantly once final tamping is done and carry on till the permitted surface     insulation system is completely prepared

 Providing shade to the concrete surface to resist heat obtained from direct radiation.

For more information, click on this link

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Published By

Rajib Dey

www.constructioncost.co

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Published By

Rajib Dey

www.quantity-takeoff.com

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