How does the grading of aggregate affect the water requirement of the mix?
Grading of Coarse Aggregate It affects the amount of cement and water requirements, workability, pumpability, and durability of concrete. The grading of coarse aggregate is important to get cohesive and dense concrete. The voids left by larger coarse aggregate particles are filled by smaller coarse aggregate particles.
What is water cement ratio and how it is related to the strength of concrete?
The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Workability can be resolved with the use of plasticizers or super-plasticizers.
How is water cement ratio calculated?
The water to cement ratio is calculated by dividing the water in one cubic yard of the mix ( in pounds) by the cement in the mix (in pounds). So if one cubic yard of the mix has 235 pounds of water and 470 pounds of cement- the mix is a . 50 water to cement ratio.
Why grading of aggregate is important in concrete?
Grading refers to the determination of the particle-size distribution for aggregate. Grading limits and maximum aggregate size are specified because these properties affect the amount of aggregate used as well as cement and water requirements, workability, pumpability, and durability of concrete.
What are the 4 main types of aggregates?
The Different Types Of Aggregate. The categories of aggregates include gravel, sand, recycled concrete, slag, topsoil, ballast, Type 1 MOT, and geosynthetic aggregates (synthetic products commonly used in civil engineering projects used to stabilise terrain).
Which type of aggregate gives good workability?
round aggregate
What is the maximum limit of water absorption of aggregate?
3%
Which aggregate is best for concrete?
– 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. Larger aggregate diameters reduce the quantity of cement and water needed.
How do you compare cement quality?
- DATE OF PACKING. Date of manufacture should be seen on the bag. It is important because the strength of cement reduces with age.
- COLOUR. The cement should be uniform in colour. In general the colour of cement is grey with a light greenish shade.
Which is the best cement for plastering?
There are three main Cement Grades from which you can choose. These are Ordinary Portland Cement (OPC), Portland Slag Cement (PSC) and Portland Pozzolana Cement (PPC) available in the market. OPC is available in two grades — 43 and 53. Both grades are considered best for plastering work.
Which cement is better UltraTech or ACC?
Capacity expansion of these two assets have also aided margins for UltraTech. As per BSE data, ACC is trading at a P/E of 19.31x which is much lower than UltraTech’s P/E of 51.9x. The return on equity given by ACC is much better, at 15.28 percent than UltraTech’s at 9.36 percent.
Which is the No 1 cement in India?
UltraTech Cement Ltd
Who is the owner of ACC cement?
LafargeHolcim Ltd
Which cement is best for waterproofing?
Water Proof Cement
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What is the ratio of Dr Fixit in cement?
LW+ should be used in concrete, plaster and mortar in all the areas of house. Mix 200 ml of LW+ with every 50 kg bag of cement.
Can white cement be used for waterproofing?
The method has the advantages that: the white cement has strong waterproof effect without adding a waterproof coating; the white cement can be directly used for outer wall decoration of various buildings, can be used as a base material for outer wall coating decoration, and has the advantages of enough strength.
What can I mix with white cement to make it waterproof?
Fixit can be mixed with white cement to create a waterproof coat in your building. It is the best waterproofing solution for the terrace, external walls.
What is difference between Birla White cement and putty?
White Cement is best suited to specialty applications where appearance is a high priority, Its wash gives a shinny lustrous matt finish to walls and is used for various applications like smooth plaster, textured plaster, architectural finishes etc whereas Wall Putty is used to facilitate care for walls.
What is the difference between white and GREY cement?
Grey cement is grey because of the presence of high amounts of iron, manganese and chromium oxide, which are found only in small traces in white cement. In contrast, white cement contains high amounts of the whitest chalk and light-coloured sand. Grey cement is used purely for construction purposes only.
Which cement is stronger white or GREY?
White cement is no more or less strong than grey cement.
Is white cement and ceramic powder same?
Ceramic powder is basically a mix of many minerals. Sodium and potassium feldspars are major constituents. Various kind of clays are also added. White cement is made mainly from lime and gypsum.
Can I mix white and GREY cement?
White and gray portland cement are very similar to each other, and can be safely blended together. You can use one color cement for a core mix and a different color cement for a shell mix, provided the mix designs and the water/cement ratios are identical.
What is the difference between GP cement and builders cement?
General Purpose Cement (or GP Cement) is straight cement. GP cement is manufactured from Portland cement clinker, gypsum and limestone. GP cement is used in all types of building and construction. Builders Cement (or General Purpose Blended (GB) cement) contains both GP cement and a nominal mass of fly ash.
Why is my cement turning white?
Why is my concrete turning white? Efflorescence is a white salty residue caused when too much moisture is moving through the concrete. As the concrete dries and its moisture rises upwards through the slab, it brings salts within the concrete to the surface as well.
Is GREY cement waterproof?
Why concrete is not watertight. Concrete consists in the main of cement, gravel/shingle, sand, water and air. The higher the proportion of water that is used in the concrete mix (measured in WCR, water-cement ratio) the more porous and more air the fully hardened concrete has.