Study Of Crack Pattern And Strength With Replacement Of Natural With Artificial Fine Aggregate In Concrete

Submitted By
Vinayak Ravindra Supekar.
(National Institute Of Construction Management And Research Center, (Nicmar))

ABSTRACT:
Now days the construction industry in the India is facing one of the major problem that is natural fine aggregate. And court awarded that totally band on excavation of fine aggregate from river because they affect on environment and changing the river direction. (fig.5). Thus the more natural fine aggregate are highly needed to replace with artificial fine aggregate. This paper presentation the study of crack pattern of concrete slab, each size is (500*300*50) mm and replacement of natural fine aggregate with artificial fine aggregate by 20%,40% 60% 100% and also finding the compressive Strength of that concrete cube. And these experiment is carried out maintain temperature 32 0cAnd the according to experimental result show that the replacement of natural sand by artificial sand up to 60% and gives best result that is maximum strength and minimum area of crack.

Key words: - Concrete slab, natural fine aggregate, artificial fine aggregate (grit), crack pattern.
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Assessment of the properties of Self-Cured Concrete.

By
Nagesh Tatoba Suryawanshi
Asst.Professor in Civil Engg. dept
S. B. Patil, College of Engineering, Indapur,(Pune).

Abstract

This Paper reports an experimental study carried out to investigate the use of water-soluble polyvinyl alcohol as self-curing agent. In this study Compressive and tensile strength of self-curing concrete for 7 and 28 days is found out and compared with conventional concrete of similar mix design. The durability of self curing concrete is found out by exposing concrete cubes to chloride environment and effect of the same on strength of cubes is determined by finding out compressive strength of cubes. The results indicated that Water retention for the concrete mixes incorporating self-curing agent is higher compared to conventional concrete mixes, as found by the weight loss with time. The result also showed that compressive, tensile and flexural strength of self curing concrete is found to be higher than conventional concrete.

Key words: Self curing agent, polyvinyl acetate, polyvinyl alcohol, water Retentivity. etc.

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An Experimental Study on Synergic Effect of Sugar Cane Bagasse Ash with Rice Husk Ash on Self Compaction Concrete

By
Amir Juma
(Amir Juma is in his final semester of Bachelor of Science in Civil Engineering in Koneru Lakshmaiah University-India. His research interests lie in the field of Self Compaction Concrete.)

E.Rama Sai
(E.Rama Sai is in his final semester of Bachelor of Science in Civil Engineering in Koneru Lakshmaiah University-India. His research interests lie in the field of Self Compaction Concrete.)

D.V.A.K.Prakash
(D.V.A.K.Prakash is in his final semester of Bachelor of Science in Civil Engineering in Koneru Lakshmaiah University-India. His research interests lie in the field of Self Compaction Concrete.)

Md. Shahbaz Haider
(Md.Shahbaz Haider is in his final semester of Bachelor of Science in Civil Engineering in Koneru Lakshmaiah University-India. His research interests lie in the field of Self Compaction Concrete.)

S.Kanakambara Rao
(Associate Professor in Department of Civil Engineering in Koneru Lakshmaiah University-India. He specialized in structural Engineering and research interests lie in the field of Self Compaction Concrete.)

Abstract
Self-compacting concrete, also referred to as self-consolidating concrete, is able to flow and consolidate under its own weight and is de-aerated almost completely while flowing in the formwork. It is cohesive enough to fill the spaces of almost any size and shape without segregation or bleeding. This makes SCC particularly useful wherever placing is difficult, such as in heavily-reinforced concrete members or in complicated work forms.

The objectives of this research were to make a synergic effect of Rice husk Ash (RHA) and Sugar cane bagasse ash(SCBA) incorporated in self compaction concrete in order to increase in strength and a better bonding between aggregate and cement paste, . The mix design used for making the concrete specimens was based on previous research work from literature. The water – cement ratios varied from 0.3 to 0.75 while the rest of the components were kept the same, except the chemical admixtures, which were adjusted for obtaining the self-compactability of the concrete.

All SCC mixtures exhibited greater vaules in compressive strength after being tested, the compressive strength was around 40% greater. In addition, the SCC had a good rheological properties as per the requirements from European standards from economical point of view the pozzolanic replacements were cheap and sustainable.
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Foamed Cellular Light Weight Concrete

By
Kaushal Kishore, Materials Engineer, Roorkee

Foamed concrete, also called cellular light weight concrete is produced by the mixing of Portland cement, sand including or alone fly ash, water and preformed stable foam. The foam is produced with the help of a foam generator by using foaming agent. The air content is typically between 40 to 80 percent of the total volume. The bubbles vary in size from around 0.1 to 1.5 mm in diameter. Foamed concrete differentiates from (a) gas or aerated concrete, where the bubbles are chemically formed through the reaction of aluminium powder with calcium hydro oxide and other alkalies released by cement hydration and (b) air entrained concrete, which has a much lower volume of entrained air is used in concrete for durability. Curing of foamed concrete unit may be done as per IS: 456-2000. Curing can be speeded up by steam.
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Understanding Nominal and Design Mixes

By
Kaushal Kishore
Materials Engineer, Roorkee

Cement concrete in India on large scale is being used since the last about 70 years. In the early days the following nominal ratio by volume for concrete were specified.

Cement

:

Sand

:

Aggregate

1

:

2

:

4

Correspond to M-15 Grade

1

:

1.5

:

3

Correspond to M-20 Grade

1

:

1

:

2

Correspond to M-25 Grade

IS : 456-2000 has recommended that minimum grade of concrete shall be not less than M-20 in reinforced concrete work. Design mix concrete is preferred to nominal mix. If design mix concrete cannot be used for any reason on the work for grades of M-20 or lower, nominal mixes may be used with the permission of engineer-in-charge, which however is likely to involve a higher cement content.
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Filed under Mix Design | 19 Comments

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