What is Concrete? Types of Concrete? Concrete Technology, Different types of notes about concrete are discussed in this website
How to Reduce Bleeding in Concrete? The tendency of water to rise to the surface of freshly placed concrete is called bleeding. Bleeding causes the formation of a porous, weak and non-durable concrete layer at the top. It also increases the permeability of concrete. Bleeding can be reduced by adopting the following measures: Using pozzolanic…
Method of Test For Bleeding of Concrete This test determines the relative quantity of mixing water that will bleed from a sample of freshly mixed concrete. Apparatus The apparatus used to conduct the bleeding test of concrete are: 1. A cylindrical container having inside diameter of 250mm, inside height of 280mm and capacity of 0.01m³(approximately)….
Difference Between Plasticizer And Super Plasticizer An admixture capable of reducing water requirements by more than 5% is classified as water reducer or plasticizer. Depending upon the degree of water reduction, the water reducers are categorized as normal water reducer, mid-range water reducer and high-range water reducers or superplasticizer. The normal water reducer reduces…
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What is Damp Proofing Admixture Damp proofing admixture also is known as waterproofing or permeability reducing admixture. One of the most important requirements of concrete is that it must be impervious to the water. The resistance of concrete to the penetration of moisture can be improved by adding chemically active water-repelling agents. Dam…
Segregation of Concrete Segregation can be defined as the separation of constituent materials of the concrete mix so that the mix is no longer in a homogeneous condition. It depends upon the proportioning of the mix, handling and placing operation of concrete etc. 4 Causes of Segregation Segregation may take place under the following circumstances(4…
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Factors Affecting The Durability of Concrete The factors affecting the durability of concrete may be external or internal causes. External Causes The external causes may be physical, chemical and mechanical as described below: a) Environmental action such as the occurrence of extreme temperature, abrasion and electrostatic action etc. b) The chemical attack by natural…
Functions Of Fine Aggregate in Concrete Fine aggregates perform the following functions: 1. It assists in producing workability and uniformity in the mixture. 2. It assists the cement paste to hard the coarse aggregate particles. 3. It helps to prevent possible segregation of paste and coarse aggregate, particularly during the transport operation of concrete…
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