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size if course aggregates used in mixing concrete for slab300 tph por le jaw crushers

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Concrete If you mix the concrete for the slab yourself, the proportions shown in Table 1 should be used. Table 1: Concrete mix proportions for production slab The amount of water is not given in the table because it depends on the materials used. Use enough water to make a workable mix that can be properly compacted. Quantities per cubic

Conc. Shrinkage vs Aggregate Size

What effect on a concrete member will it have if a smaller aggregate size (pea rock) is used vs a larger size (#57)? Correct me if I'm wrong but if we keep the same w/c ratio for both mixes (compare apples to apples) we now have to add additional water and cement to our mix for the smaller aggregate because of additional surface area associated with a smaller aggregate size.

Concrete Mix Design | Different Grades of Concrete

May 17, 2017 · Concrete Mix Design:-Concrete is a composite mixture which consists of Cement, Sand and Aggregate. Concrete mix design is the procedure for finding the right quantities of these materials to achieve the desired strength. Accurate concrete mix design makes concrete construction economical.

On Aggregate Grading

On Aggregate Grading is good concrete performance dependent on meeting grading limits? Specifying concrete mixtures with well-graded (WG) combined aggregates can be controversial. Advocates 1-4 argue that such mixtures ...

How to Calculate Quantities of Cement, Sand and Aggregate for

How to Calculate Quantities of Cement, Sand and Aggregate for Nominal Concrete Mix (1:2:4)? Mix design is a process of determining the right quality materials and their relative proportions to prepare concrete of desired properties like workability, strength, setting time and durability.

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The bags will probably be marked with the aggregate size and suitable concrete thickness. 10mm sounds OK. In one of the other posts today I saw the tip of putting a layer of chicken wire half-way through the depth of concrete as you place it, to reduce the chance of cracking.

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Calculate Cement Sand Aggregate and Water for Concrete

Concrete mix ratios are prescribed ratio of cement, sand and aggregate to get the desired strength of concrete. For example, if the concrete mix ratio of M20 concrete is 1:1.5:3, then 1 part of cement, 1.5 part of sand and 3 part of aggregate in volume should be batched to prepare M20 grade concrete.

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Importance of Gravel and Sand for Concrete

Concrete is made up of cement and water plus an aggregate composed of sand and gravel. The sand and gravel do more than act as filler, though. The size and amount of gravel added to a bag of concrete also determines the product's volume, strength, and ...

The Effects of Aggregates Characteristics on the

ii THE EFFECTS OF AGGREGATES CHARACTERISTICS ON THE PERFORMANCE OF PORTLAND CEMENT CONCRETE by Pedro Nel Quiroga and David W. Fowler The University of Texas at Austin Austin, Texas Report ICAR

Different Types & Sizes of Aggregate for Concrete

Aug 11, 2018 · Aggregate may be natural, manufactured or recycled. It includes gravel, crushed stone, sand, slag, recycled concrete and geosynthetic aggregates. For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete.

Concrete Batching, Mixing, Placing and Compaction of Concrete

The mixing time or period should be measured from time all the cementing materials and aggregates are in mixer drum till taking out the concrete. Mixing time depends on the type and size of mixer, on the speed of rotation, and on the quality of blending of ingredients during charging of the mixer.

Concrete Mix Design Step by Step full Calculation

Concrete mix design is the process of detrmining right proportions of cement, sand and aggregates for concrete to achieve target strength of concrete. The Advantages of concrete mix design is that it gives the right proportions of materials, thus making the concrete use economical in achieving required strength of structural members.


The effects of aggregate type, size, and content on the behavior of normal and high-strength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm ('h in.) or 19 mm (:Y. in.), and


Mar 23, 2015 · For heavily reinforced concrete members the nominal maximum size of the aggregate should be usually restricted to 6 mm less than the minimum clear distance between the main bar or 5 mm less than the minimum cover to the reinforcement, whichever is less.

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Concrete slab calculation

I would say a good mix to use by volume would be 1 part cement / 2.5 parts sand / 3 parts coarse aggregate. The coarse aggregate being graded from 20mm to 5mm in size. For 1 cubic meter, this would equate to approximately, 350kg cement, 875kg sand, 1050kg coarse aggregate (20-5mm) and 180 litres of water.

Aggregates for Concrete

The usual range employed is between 9.5mm and 37.5mm in diameter. - Fine aggregates are usually sand or crushed stone that are less than 9.55mm in diameter. • Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete.

Concrete and Mortar Guide - DIY Extra

Sep 01, 2018 · Sand – Sand acts as a fine aggregate in concrete and usually forms the bulk of the mix along with the course aggregate. The sand used for mixing concrete will often, if not always, be referred to as Sharp Sand or Builders Sand. In certain circumstances, some of the sand will be replaced by a decorative additive such as crushed glass.

Is there any alternative for course aggregate in concrete mix

Is there any alternative for course aggregate in concrete mix design? Are there places in India where the lead cost is much more than case of sand (in aggregate)? Can we use stone dust instead of …

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Effect of Aggregate Size on Strength

Q.: How much stronger is a floor made with 1/2-inch aggregate than one with 3/4-inch aggregate if all other ingredients remain the same? A.: If the quantities of coarse aggregate, fine aggregate, cement and water are the same for both mixes, the mix with l l/2-inch aggregate will have greater slump and will probably bleed more.


2016/10/01 · This post explains all the 14 engineering properties of aggregates used for concrete such asabrasion resistance, impact resistance, bulking, size etc. Engineering Properties of Aggregates Aggregates are used in ...

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Oct 01, 2016 · For the preparation of economical concrete mix on should use largest coarse aggregates feasible for the structure. IS-456 suggests following recommendation to decide the maximum size of coarse aggregate to be used in P.C.C & R.C.C mix. Maximum size of aggregate should be less than. One-fourth of the minimum dimension of the concrete member.

Subgrades and Subbases for Slabs

Nov 22, 2017 · Following compaction, the most effective way to assure that the soil-support system is ready for concrete is to proof roll the surface. Use a loaded dump truck or a ready mix truck and drive over the subbase in a grid to cover as much of the surface as possible.

What's the best size of coarse aggregate in concrete in

2016/10/14 · Generally the size of coarse aggregate used is 10-12.5 mm. If we use the proportional mix of different sizes small to large (>4.5 mm to 20/25 mm), this make the concrete structure compact by align ...