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Jino John ¹, Lins Paul Kuriakose ¹, T. Meenambal ²

Affiliations
1 Sri Krishna College of Technology, IN
2 Government College of Technology, Coimbatore, Tamilnadu, IN

Abstract

The study deals with the temperature stress distribution on concrete and fly ash concrete slabs by non linear (Quadratic Temperature Profile) method. Concrete and fly ash concrete slabs of size 1000mm x 1000mm x 150mm were cast. Cement was replaced by 10, 20, and 30 % of fly ash. M40 grade concrete was used for the study. Temperatures were measured at top, middle and bottom of the slab by using thermocouple for 7 days at every one interval from 6 am to 8pm after 28 days curing. The study shows that actual temperature distribution across the depth of slab was highly nonlinear. The temperature stresses were calculated by Quadratic Temperature Profile Method. Temperature stress gets reduced with increase in percentage of fly ash replacement.

Keywords

Fly Ash Concrete, Concrete Pavement, Non Linear Temperature Distribution, Temperature Stress, Non Linear Temperature Stress, IRC 44

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Jino John ¹, P. Parameswaran ²

Affiliations
1 Department of Civil Engineering, V.L.B. Janakiammal College of Engineering and Technology, Coimbatore-641 042, T.N., IN
2 Department of Civil Engineering, P.S.G College of Technology, Coimbatore, T.N., IN

Abstract

The study deals with the investigation undertaken to examine the possibility of using recycled concrete aggregate (RCA) as a substitute to natural coarse aggregate (NCA). The concrete specimens were cast by partially replacing cement by fly ash, and NCA was replaced by 30%of RCA. Twenty % replacement of cement by fly ash gave optimum results for compressive strength, split tensile strength and flexural strength.

Keywords

Recycled Concrete, Aggregate, Fly Ash.

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Sunilaa George , Jino John , P. N. Magudeswaran ¹, R. Thenmozhi ²

Affiliations
1 Department of Chemistry, VLB Jankiammal College of Engineering and Technology, Coimbatore, IN
2 Department of Civil Engineering, Govt. College of Technology, Coimbatore, T.N., IN

Abstract

River sand is widely used for concrete as fine aggregate. The increased cost of river sand and depletion in ground water table due to illegal sand mining leads to find an alternative for fine aggregate without compromising the strength. In this study, concrete mix M₃₀ has been designed using quarry dust and manufactured sand by replacing the river sand. Four mix proportions were made to test the effect of inclusion of quarry dust and manufactured sand in concrete and the results were compared with the control specimens. It was found that the strength of the concrete is enhanced in both the types of replacements.

Keywords

Manufactured Sand, River Sand, Quarry Dust, Cement Concrete.

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Jino John ¹, Sunilaa George ¹, P. N. Magudeswaran ²

Affiliations
1 Department of Civil Engineering, VLB Janakiammal College of Engineering and Technology, Kovaipudur, Coimbatore-641 042, T.N., IN
2 Department of Chemistry, VLB Janakiammal College of Engineering and Technology, Kovaipudur, Coimbatore-641 042, T.N., IN

Abstract

The sharp fall in underground water table in river basins is said to be the outcome of indiscriminate sand mining resulting in the deepening of river beds. The natural sand beds have voids of 45-50% in the soil where the rain water is retained by the river sand. This property of the river sand is mainly responsible for maintaining the ground water table in and around river basins. This paper deals with the partial replacement of river sand by fly ash in aggregate in concrete without compromising the strength.

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P. N. Magudeswaran ¹, Sunilaa George ², Jino John ²

Affiliations
1 Department of Chemistry, VLB Janakiammal College of Engineering and Technology, Coimbatore-641 042, T.N, IN
2 Department of Civil Engineering, VLB Janakiammal College of Engineering and Technology, Coimbatore-641 042, T.N, IN

Abstract

The Global warming gases are increasing steadily in the world due to the advent of industrialization. In 1800 before the industrial revolution started, the concentration of CO₂ gas in the atmosphere was estimated to be 260 ppm only. The concentration of CO₂ in the year 1988 was observed in Hawaii to be 350 ppm. The data indicate that the rate of concentration of global warming gases (GWG) in the atmosphere has increased considerably in the past few decades. This pushes the average global surface temperature by about 0.7°C. The United Nations Intergovernmental Panel on Climate Change (IPCC) has taken the view that average global temperature could rise by 1.4°C-5.8°C by the end of this century. This paper discusses some aspects of global warming and the role of admixtures in reducing emissions of CO₂ to the atmosphere.

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