Vacuum Concrete The concrete from which water is extracted by a vacuum process before the hardening takes place is known as vacuum concrete. The type of concrete having relatively high slump in order to achieve consolidation is usually useful in case of thin slabs and walls. This is achieved by withdrawing considerable amount of water … Read more
Lightweight Concrete It may be defined as the concrete of substantially lower unit weight than that made from gravel or crushed stone. Ordinary concrete is quite heavy and its density is 2300 kg/m3. It is not suitable for use in floor filling as filler in general. If used, it adds considerably to the dead weight … Read more
Aggregate impact value test gives an indication of aggregate’s toughness property (i.e. property of a material to resist impact) Aggregate impact values are used to classify the stone aggregates with respect to toughness property as given below. Aggregate impact value (%) Toughness Properties <10 Exceptionally tough / Strong 10 – 20 Very tough / Strong … Read more
No Fines Concrete No fines concrete may be defined as concrete mixtures containing little or no fine aggregate. The fine aggregate is not added in this concrete so that there are voids left in the coarse aggregate. The coarse aggregate may be any of the usual type or the light weight aggregate. The coarse aggregate … Read more
Aerated Concrete Aerated concrete may be defined as concrete made very light and cellular by the addition of prepared foam or by generation of gas within the unhardened mixture. It is also termed as cellular concrete and foamed concrete. By Generation of Gas The addition of powered aluminium or zinc to the cement causes evolution … Read more
What is Ready Mix Concrete? The concrete which is mixed in the agitator trucks or at the central batching plant and is delivered at site is known as ready mix concrete. It is used where there is shortage of space for the procurement of the material, where the site is very congested. What Are The … Read more
What Is Shotcrete? The concrete in which mortar or concrete is pneumatically projected at high velocity on the backup surface is known as shotcrete or gunite. It is also known as spray concrete as the force of jet impacting on the surface compacts it so as to make itself supporting. This type of concrete has … Read more
According to size the aggregates are classified as: Fine Aggregate Coarse Aggregate All in Aggregate Fine Aggregate It is the aggregate most of which passes 4.75 mm IS sieve and contains only so much coarser as is permitted by specification. According to source fine aggregate may be described as: Natural Sand– it is the aggregate … Read more
One of the first field investigations for a concrete construction project is to search for sources of aggregates which will give material of good quality at economical rates. Suitability of aggregate will depend upon the geological history of the region. The aggregate as per nature of formation may be divided into two types. Natural Aggregates … Read more
To describe an aggregate by its maximum and minimum size is not sufficient. It has to be graded from its minimum to maximum size. IS-383 recommends the following grading limit for fine aggregates. Grading Limits For Fine Aggregates Sieve Size Percentage of Passing For Grading Zone-I Grading Zone-II Grading Zone-III Grading Zone-IV 10 mm 100 … Read more
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