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Hand mixing of Cement Concrete | Civil Engineering Terms

Mar 12, 2017 · Following points must be kept in mind for hand mixing of cement concrete. Hand mixing of cement concrete should be done in masonry platform or iron sheet. For example if we are making concrete of ratio 1:2:4 proportion by hand, first two boxes of sand and one bag of cement should be mixed dry. Mixing of sand and cement should be dry thoroughly.

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How to mix concrete at site? Mixing Type? - Tutorials Tips ...

The period of mixing in the rotating drum should be 1-2 minutes. Advantage of machine mixing Concrete. Water cement ratio can be controlled easily in machine mixing. All materials like cement, sand metal etc, can be mixed properly. Easily control over mixing i.e. up to the required colour and consistency.

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Effects of prolonged mixing of concrete - Civil Engineering diary

Mar 15, 2020 · Mixing of concrete for an extended period can adversely affect the properties of a concrete mix. Tests have shown that mixing air-entrained concrete for a period longer than 180 minutes can significantly reduce the content of entrained air. Air-entrained admixture used to prevent the damage of concrete due to freeze-thaw cycles in cold weather.

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Concrete Batching, Mixing, Placing and Compaction of Concrete

Batching is the process of measuring concrete mix ingredients either by volume or by mass and introducing them into the mixture. Traditionally batching is done by volume but most specifications require that batching be done by mass rather than volume. Percentage of accuracy for measurement of concrete materials as follows.When the quantity of cement to be batched exceeds 30% of scale capacity, the measuring accuracy should be within 1% of required mass. If measuring quantity is less than 30%...

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Role and Quality of Mixing Water in Concrete - Civil Engineering

6. It enables the concrete mix to flow into moulds. Quality Of Mixing Water In Concrete. The water to be used for preparing the concrete should fulfil the following requirement. 1. It should be fresh & clean. 2. It should be free from organic impurities injurious amounts of acids or alkalies, hygroscopic, greasy & oily substance. 3.

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