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Ordering Concrete

WHEN ORDERING PRE-MIXED concrete you will need to tell the supplier:Name and address for delivery The use of the concrete (ie driveway, housing slab, commercial)The amount you need in cubic metres The Class of the concrete. There are two classes that concrete can be supplied as: Normal Class and Special …

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Strength and Durability

Well made concrete is a naturally strong and durable material. It is DENSE, reasonably WATERTIGHT, able to resist changes in TEMPERATURE, as well as wear and tear from WEATHERING. Strength and Durability are affected by the density of the concrete. Denser concrete is more watertight (or less permeable). Concrete durability …

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T-beam Design for Flexure

The T-beams were then designed for the flexural forces they would experience. This design comprised of the determination and selection of the adequate amount of steel necessary in each of the critical T-beam sections. The steel reinforcement is necessary in the portions of the Tbeam that are in tension because …

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Wrought Iron

Wrought Iron:   It is almost pure iron. It contains less than 0.15% carbon. Attempts are made to reduce the other impurities during the process of manufacturing.   Properties of Wrought Iron: 1. Its ultimate compressive strength is 200 N/mm2 and ultimate tensile strength is 375 N/mm2. 2. It is …

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Cast Iron

 Cast Iron: Important properties of cast iron are:   (a) Compression strength is 700 N/mm2 and tensile strength is 150 N/mm2. (b) It is brittle and does not absorb shocks (c) Its specific gravity is 7.5. (d) Its structure is coarse, crystalline and fibrous. (e) It cannot be magnetised. (f) …

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Forms of Prestressing Steel

Wires Prestressing wire is a single unit made of steel. Strands Two, three or seven wires are wound to form a prestressing strand. Tendon A group of strands or wires are wound to form a prestressing tendon. Cable A group of tendons form a prestressing cable. Bars A tendon can …

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DIFFERENCE BETWEEN ONE-WAY SLAB AND TWO WAY SLAB

One way slab :  rcc One way slab are thos supported continuously on two opposit sides so that loads are carried along the one direction only. oneway slab are made to span in shorter direction. The main reinforcement is provided in the span direction and also provided in traverse direction …

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