Limits and guidelines from standards; 1) IS 3025-1984[5] Methods of sampling and test for water and waste water. 2) IS 456-2000[6]Plain and reinforced concrete – code of practice.
Considering this, what type of water is acceptable in a concrete mix?
Acceptable source of water There treated water are used for agricultural requirements and daily needs for construction industry. like washing aggregates, as concrete mixing water and curing of the same. Water from river and sometimes even sea are considered suitable if it is free from brackish matter.
Similarly, why is water used in concrete? Water is the key ingredient, which when mixed with cement, forms a paste that binds the aggregate together. The water causes the hardening of concrete through a process called hydration. The role of water is important because the water to cement ratio is the most critical factor in the production of “perfect” concrete.
Subsequently, one may also ask, is code for testing of concrete?
IS: 6452 – specifications for HAC for structural use (high alumina cement). IS: 4031 – chemical analysis and tests on cement. IS: 456; 10262; SP 23 – codes for designing concrete mixes. IS: 1199 – methods of sampling and analysis of concrete.
Which water is used for construction work?
The water used for mixing and curing should be clean and free from injurious quantities of alkalis, acid, oils, salt, sugar, organic materials, vegetable growth and other substances that may be deleterious to bricks, stone, concrete or steel. Potable water is generally considered satisfactory for mixing.
12 Related Question Answers Found
How do you mix cement and water?
To mix cement, start by combining 1 part cement, 2 parts sand, and 4 parts gravel in a large bucket or wheelbarrow. Next, make a small crater in this mixture and add half a bucket of water. Mix the cement with a shovel and add more water until it’s formed a smooth paste similar to peanut butter.
What is minimum water cement ratio?
Ideally you need to aim for 0.25 to 0.4 Water:Cement ratio(minimum) Water Cement Ratio means the ratio between the weight of water to the weight of cement used in concrete mix. Normally water cement ratio falls under 0.4 to 0.6 as per IS Code 10262 (2009) for nominal mix (M10, M15 ….
Does adding more cement make concrete stronger?
A mix with little water and more concrete mix will be dryer and less workable but stronger. To make the concrete stronger, add more cement or less sand. The closer you bring the ratio to an even one-to-one of sand to cement, the stronger the rating becomes.
Is water good for concrete?
Water is an essential component when making concrete. The moisture that water provides also gives concrete its strength during the curing process. While water is one of the most important ingredients in concrete, it can also be the most destructive in excessive amounts.
How much water can you add to concrete?
The rule of thumb is: One gallon of water will increase the slump of one yard of concrete by 1 inch.
How much water do I need for 25kg of concrete?
In respect to this, and only as a rough guide, the ratio of water to cement should be around 0.55. If your total cement requirements were 25kg, then the calculation would be: 25 x 0.55 = 13.75kg (liters) of water.
Why sea water is not used in concrete?
Sea water also contain small quantities of sodium and potassium salts. This can react with reactive aggregates in the same manner as alkalies in cement. Therefore sea water should not be used even for PCC if aggregates are known to be potentially alkali reactive.
How do you test cement?
The colour of cement gives an indication of excess lime or clay and the degree of burning. RUBBING. Take a pinch of cement between fingers and rub it. HAND INSERTION. Thrust your hand into the cement bag and it should give cool feeling. FLOAT TEST. SMELL TEST. PRESENCE OF LUMPS. SHAPE TEST. STRENGTH TEST.
How do you calculate concrete strength?
In very simple words, compressive strength is calculated by dividing the failure load with the area of application of load, usually after 28 days of curing. The strength of concrete is controlled by the proportioning of cement, coarse and fine aggregates, water, and various admixtures.
Why slump test is done?
Concrete slump test. The concrete slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. It can also be used as an indicator of an improperly mixed batch.
What is m20 concrete?
The Concrete mix ratio for M20 grade of concrete is 1:1.5:3 that mean 1 part of cement, 1.5 part of sand (fine aggregate) and 3 parts of aggregate (crushed stone) in volume and then batched for mixing.
What is the ideal value of slump?
Q: What is the ideal value of slump? In case of a dry sample, slump will be in the range of 25-50 mm that is 1-2 inches. But in case of a wet concrete, the slump may vary from 150-175 mm or say 6-7 inches.