Concrete Mix Design With Different Mixes Of Asbestos

Osama Ahmed
Syed Nizam Uddin
Syed Jaffer Ali

In this constructed environment, the rising prizes of building construction materials are the factor of great worry. The coarse aggregates are the main ingredients used in concrete. We all want that our buildings must be strong, stable and should build with the construction material of reasonable prizes. Every construction industry totally relies on cement, aggregates whether it is coarse or fine for the production of concrete.In this research, we have replaced the coarse aggregate partially by using asbestos cement sheet waste. It is a waste material so by using asbestos cement sheet waste as a replacement we can solve the problems of price rising. Therefore, we have planned to prepared some number of cubes using asbestos cement sheet waste at various proportions like 0%, 5%, 10%,15%, 20% and 25% by weight of coarse aggregate.The properties for fresh concrete are tested for compressive strength at the age of 7, 14 and 28 days. It is found that with the increase in the percentage replacement of coarse aggregate with AC sheet waste there is increase in Compressive Strength upto 10 % replacement after that there is decrease in Compressive Strength with further replacement of coarse aggregate with AC sheet waste. It can also observed that 28 days compressive strength is increased by 3.33%, 6.41% upto 10 % replacement of coarse aggregate with AC sheet waste as compared to conventional concrete

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Batching and Mixing of Mortar And Concrete Ingredients

Shubham Sunil Malu

A concrete plant, also known as batch plant is device that combines various ingredients to form concrete. In general, it is a process of combining all ingredients of concrete as per the mix design. Batching and mixing are extremely important parts of mortar and concrete manufactures they influence properties of concrete both in plastic as well as in hardened stages. Also, it is one of the important processes, which is to be done to obtain a quality concrete. Many processes are carried out in various parts of the world with many changes and different equipment. There are various types of batching and mixing equipment and methods that is to say from manual to most sophisticated computerized batching and mixing. Mechanization improves quality of batching and mixing, its speed and thereby can most often result in economy.There are number of factors which are to be considered while doing the process which are discussed in this paper. Moreover, the machinery, which is to be required while making concrete or for batching process and discharging and unloading of the mixture, are also discussed in brief.

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Compression test on concrete

Shubham Sunil Malu.

With the growth of construction industry there is need to give quality in it. Many of the projects fail in construction field because of improper results and improper testing on site. One of the basic and important test is compressive test which should be done carefully since it is taken as the backbone of all tests of civil engineering related to concrete. Compression test is required almost in every project since it gives us a brief idea of the grade and type of concrete. Many of them do small mistakes in these which includes the different exclusion of different parameters of concrete, improper procedure for filling and compacting concrete, wrong methods of testing of concrete and many more. This paper contains all the necessary parameters, equipment and the acceptance criteria of the test. It also includes procedure for filling and compacting concrete as well as methods of testing of concrete.

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Proper Slab Construction Concepts – A Challenge to overcome

Sourav Dutta

What is slab?
A RCC (Reinforced Cement Concrete) slab is the most common structural element of any type of building. Horizontal slabs, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings.Here discussion on “flat slab” has not been considered.



Typical loads to be considered for slab design
(i) Dead load: Any permanent load acting on the slab e.g. self-weight of slab, weight of floor finish & plaster

(ii) Live Load: Any non-permanent or moving load e.g. weight of occupants, furniture, and partitionon the slab

(iii) Snow load (if any)

Note: Earthquake and Wind loads are not considered in the design of slabs.

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Care in Concrete Mix Design

Materials Engineer, Roorkee

While carrying out Concrete Mix Design, there are chances that we do not consider some technical points resulting the production of poor quality concrete. This is best illustrated by the following two examples. The Ist mix design is carried out carelessly, where as the 2nd mix design is worked out taking into consideration all technical points. In both mix design examples the materials and requirements are same as given below:

1. Cement, PPC, 7-days strength 36.5 N/mm2 and 28-days strength 46.8 N/mm2. Specific gravity 3.0
2. Aggregates grading are as given below:

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