Generally, concrete is required to be air entrained event if it is not exposed to freezing and thawing due to important benefits that concrete enjoys in other ways such as improving concrete workability. Concrete air entrainment is not an easy ...
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What is the Basis for Selection of Concrete Mix Proportions?
The decision on selecting concrete mixture proportion is the process of optimizing number of favored properties based on the requirements of the project. In the following sections, the basis for selection of concrete mixture proportions will be discussed. Basis for ...
M40 Grade Concrete Mix Design as per ACI Method
M40 grade stands for it’s a mix of concrete with a characteristic compressive strength of 40 N/mm2. The mix design procedure for M40 grade concrete as per ACI Method is discussed. M40 Grade Concrete Mix Design Procedure 1. Required Data ...
Concrete Discharge Time Requirements and Consequences of Exceeding Time Limit
Concrete discharge time requirements ensures that hardened concrete would meet requirements set at design stage. It is the time available for placement of concrete in formworks after it has been mixed. When water is added to dry mixture, chemical reactions ...
Methods of Pouring Concrete as per Recommendations of ACI 304R-00
Concrete pouring is a crucial process which not only needs properly qualified persons but also considerable focus and concentrations. Almost all codes have established certain specifications to ensure proper concrete pouring and prevent its segregation. In this article, correct concrete ...
Concrete Cover Specifications for Reinforcement in Different Codes
Concrete cover is assumed to be the first measure considered to prevent influences of aggressive elements on the reinforcement steel bars. That is why utmost cautions are needed during concrete cover thickness design and its construction. Commonly, the thickness of ...
Measurement of Air Content in Concrete by Pressure Air Method
Measurement of Air Content in Concrete Air content of concrete is measured by the pressure air measurement method which is based on the principles of The Boyle’s law. The Boyle’s law states that the volume of the gas is inversely ...
Types of Shrinkages in Concrete and its Preventions
Shrinkage is an inherent property of concrete. The shrinkage in concrete can be defined as the volume changes observed in concrete due to the loss of moisture at different stages due to different reasons.