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When you are about to start the construction work, you may have so many doubts which are not clear to you. This site attempts to address some common questions. If you have any other questions, you are welcome to write to us. Our panel of experts will be happy to provide you with the answers.
When water is added, pozzolana material combines with lime and alkalies that are present in cement and forms a compound which contributes to strength. Additionally, it makes the concrete less impermeable and sulphate resistant. It also contributes to the workability, reduces bleeding and controls destructive expansion from alkali aggregate reaction. Leaching of free lime is also reduced.
It also reduces heat of hydration, thereby controlling temperature differentials and minimizes the incidence of cracks.
Reinforced cement concrete is a mix that is placed around a structure of steel rods, like you see on the roof. For binding the bricks as well as plastering mortar mix is prepared using cement, sand and water in recommended proportions.
When you mix various material together, there will be air which is entrapped between them. This air has to be removed to make concrete impervious and attain maximum strength. Otherwise there will be voids in the concrete which reduce the strength substantially.
Concreting work should be done preferably during morning or evening time. If concreting work is done during high temperatures, the water that is present in the mix will evaporate affecting the material ratios. Since water is essential for hydration process, avoid concreting in the afternoon time. If unavoidable, cover the concrete with a plastic sheet to reduce evaporation losses.
During concreting work you need metal shuttering frame work to support the construction. Shutterings are made either with wood or steel. Shuttering should be placed in such a way that there are no gaps in between. The timeframe for de-shuttering differs depending on the type of work.
Why cracks appear and what precautions can be taken?
There are many reasons for cracks.
Sand contains clay. If clay is not washed and removed, it absorbs water from the concrete mix, leaving lesser water for cement hydration. Therefore wash sand thoroughly and dry it before use. Don’t forget to sieve the sand.
When you use bricks which are not properly burnt or are chipped at the edges, they absorb water from the mix. Therefore use good quality bricks which are properly burnt. Soak them in water for 24 hours and use them in wet condition.
If the curing process is not started on time or if the curing is not done for a specified period, the mixture faces water stress and causes cracks. Therefore start curing as soon as concrete dries. And continue curing for the prescribed time. Avoid concreting during hot times and cover concrete with plastic to avoid water evaporation.
Cement is a powdery-type substance. It is manufactured using mixture of elements that are found in natural materials such as limestone, clay, sand and/or shale. Materials such as sand, jelly, water, bricks, and steel are used in construction; cement binds these elements together to provide strength and durability to these constructions.
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Dalmia Cement (DCBL) is among the top most cement companies in India. We're also the first cement manufacturing company in the country to set up an R&D lab for concrete.
Founded in 1939, customer delight has always been the bottom line of Dalmia Culture. And, we achieve customer delight by constantly improving and manufacturing the best quality cement products. Dalmia Cement is expanded horizons of its leading cement products (Dalmia Ordinary Portland Cement - OPC 43 & 54 Grade and Dalmia Pozzolana Portland Cement - PPC) to cater to South, East and North East parts of the country. Under the leadership of Puneet Dalmia, we are deeply focused on sustainable growth, driven by strong ethical values and newthink!