c30 concrete mix calculator


sand: 621kg I have to design a high strength mix of 60 Mpa for a school project and im almost clueless on where to start. I’ve been told to order different quantities from quote to quote regarding the mix ratio. You must just ensure that workers are on site to place the concrete as soon as it is poured from the truck.

Also calculate the place where you pour the concrete if its filled up if you worked it out to be 6m3. Fax: +86-371-6389 8989, Add: Yuhua Building, No.68 Beihuan Road, Zhengzhou, Henan, China Good day For site mix calculations, refer to the concrete calculator.

Is the later weaker, and should i reject the quote or is it still acceptible? Both reach between 42,5 and 62,5 after 28 days. MPa at 28 days Cement Sand Stone (19 or 26,5 mm) You tell me! Janek I’m having my foundation lifted on the side of my house and under pinned. This is because the hydration process would be in an advanced stage and retempering of the concrete will weaken it. If concrete is not placed immediately after batching, cover it with plastic sheets or wet sacking so that it does not dry out in the sun or wind. Fax: +86-371-6389 8989, Conventional grade C20, C25 and C30 concrete mix ratio, 20 ton Densified Microsilica 85% shipped to Belgium, Fluidity test of densified silica fume and undensified silica fume, 20MT 20kg water-soluble bag packed 95% undensified Silica Fumes shipping to Manila.

This can only be answered by a “competent person” who should be overseeing the build and will specify the ratios needed for your soil conditions etc.

Housing Consumers Protection Measures Act, Tree Damage to Walls & Foundations – SANS10400-H Annex-D, Energy Usage & Sustainability (SANS 10400X & XA), Glass and Glazing as a Construction Element, National Home Builders Registration Council – NHBRC.

13/03/2013 Hi, I can’t make complete sense of the difference of mixing ratios between’ Large Batches of Concrete Mixes’ ( 25 Mpa =7 bags cement(0.231m3) , 0.7 m3 sand , 0.7 m3 stone gives a ratio of 1: 3: 3) and ‘Small Batches of Concrete Mixes’ which states that the 25 Mpa ratio is 1: 2.5: 2.5) that almost 17 % less sand & stone ? 2, meet the concrete peaceability. 10 50 kg 230 kg 196 kg If you have large quantities of concrete to place, it is much more convenient to order it ready mixed. When batching by volume, it is safe to assume that one wheelbarrow-load is equivalent to two sacks of cement.

So they have given you a very difficult task. Concrete & Masonry, Foundations

I find this guide very problematical and thus misleading and therefore dangerous as follows: © Copyright: PJAWEB, 2020, All Rights Reserved.

Calculation of concrete compounding strength: In which: This is a confusing thing with concrete and mostly this is to do with the size stone being used, commonly 19mm, 13.2mm or 9.5mm. One 50 kg sack of cement has a volume of 33 litres (0,033 cu m).

Tel: +86-371-5663 6667 15 Mpa This is a low-strength concrete mix and is suitable for house foundations that are not reinforced, and for boundary walls and freestanding retaining walls.. To make 1 cubic metre of 15 Mpa concrete you will need to mix 5 1/2 bags of cement with 0,75 cubic metres of sand and 0,75 cubic metres of stone.

Do not let the concrete stand so long that it stiffens before it is placed. stone: 1252kg. NB In this chapter it is also stated that “there is little experience in South Africa of the manufacture of high-strength concrete.” When you mix concrete you add water gradually until it has the right consistency. Concrete Cost Calculator .

Concrete Mix Ratio Calculator.

2. The water part of mixing concrete is NOT an exact sience I’m afraid to say. in my mind im already thinking something Fly ash would be necessary to help increase strength but at the same time help mitigate the low water cement ratio necessary to achieve high strength. This is the amount that concrete placed in a cylinder will sag or slump when the cylinder is removed. Let’s say I order 6m3 of ready mix concrete, how do I check, in the truck, if the quantity of concrete is what I ordered? Enter Height (mm) Enter Length (m) Enter Width (mm) AfriSam Foundation or Star Mix. Calculator are provided for a general mix and a paving mix, the different ratio of materials are: General mix - 1:5 cement:all-in ballast or 1:2½:3½ cement:sharp sand:gravel. Recommended ratios will enable you to mix concrete to match the function for which it is intended, or the strength of the concrete required. A layman should not be thinking of designing 60 MPa concrete without the advice of a civil engineer or the Cement & Concrete Institute who are always most helpful in my experience (011) 315 0300. As far as sand is concerned, “a fineness modulus of 2,7 to 3,0 should be suitable.” Crusher sand is preferred in SA.


Use a reputable company that won’t rip you off. Slump tests also determines if the amount of water added is ok, it is used to determine the consistence of the concrete mix. Your water/cement ratio is critical.Any high strength concrete design should include the “slump” allowance. The recommended ratios are based on the use of either 19 mm or 13,2 mm commercial crushed concrete stone. Required fields are marked *.

15 Mpa This is a low-strength concrete mix and is suitable for house foundations that are not reinforced, and for boundary walls and freestanding retaining walls. Whether you are mixing by hand or in a concrete mixer, you will have to measure materials accurately to ensure you achieve concrete of consistent quality. This goes to depth, width and MPa (the strength of concrete for the specific job) and if additional reinforcing bars need to be included.

cement: 343kg

There are two methods: one is to use a variety of materials amount per 1 cubic meters, such as cement 300 kg, water 180 kg, sand 690 kg, gravel 1260 kg; the other is that the water cement ratio and cement ratio and concrete content of different materials per unit mass of the cases, such as precedent can be written as: C:S:G=1:2.3:4.2, W/C=0.6. On-Site Concrete calculator.

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Concrete not placed and compacted within this time, or which has stiffened to a degree that its workability (consistency) cannot be restored fully by turning it over a couple of times with spades, should be discarded.
Please enter the dimensions in the white fields below and click calculate to display the results. The strength of concrete is divided into twelve grades, such as C7.5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60 and so on.

You will also need to add more water to compensate for the lack of water in the sand. 3. Large Batches of Concrete Mixes.

The concrete can be moved in buckets or wheelbarrows. Essential Book

Stone does not bulk in volume when it gets wet and so no correction is necessary.

Crushed limestone with aggregate size > 8 mm.

It is then mixed in a factory environment, according to your specifications. See below for help on concrete. It also states that a “good quality superplasticizer is an essential ingredient of high-strength concrete.” It explains how to work out the quantity required – tests need to be done in a lab.

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**IMPORTANT** If it is jolted too much, the stone will settle at the bottom.

Hi Ross, Thanks for the comment. Am I on the right track, any help would be appreciated. I’d say about 85% full.

It plays a major role in creating a strong, durable concrete block. A builders’ wheelbarrow, filled level to the top, has a volume of 65 litres (0.065 cu m, which is almost double the volume of a sack).

The strength of concrete is divided into twelve grades, such as C7.5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60 and so on.

The larger the stone the more empty volume/space between the stones that has to be filled with sand and cement and conversly the smaller the stone size then, by proportion, there will be less sand and stone. According to Fulton’s Concrete Technology published by the CCI, which has a chapter on concrete mix design (maybe there’s a copy in your school library? Hi Ally, Sorry for the delay, we do the replies on a voluntary basis when we can. The basic techniques that will enable you to cast a foundation or slab are relatively straightforward.

If there is a reasonably large quantity of concrete to be used, it is advisable to hire a concrete mixer. ), high-performance concrete with a 28-day compressive strength of 68,9 MPa = high strength concrete.

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