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T. Felixkala ¹, P. Partheeban ²

Affiliations
1 Dept. of Civil Engg., Sathyabama University, Chennai-600 912, IN
2 Principal, Sriram Engineering College, Chennai-600 054, IN

Abstract

This paper examines the possibility of using granite powder as replacement of sand and partial replacement of cement with fly ash, silica fume, slag and superplasticiser in concrete. The percentage of granite powder added by weight was 0, 25, 50, 75 and 100 as a replacement of sand used in concrete and cement was replaced with 7.5% silica fume, 10% fly ash, 10% slag and 1% superplasticiser. The effects of water ponding temperatures at 26°C and 38°C with 0.4 water-to-binder (w/b) ratios on mechanical properties, plastic and drying shrinkage strain of the concrete were studied and compared with natural fine aggregate concrete. The test results obtained indicate that granite powder of marginal quantity as partial sand replacement has beneficial effect on the mechanical properties such as compressive strength, split tensile strength, modulus of elasticity. Furthermore, the test results indicated that the values of both plastic and drying shrinkage of concrete in the granite powder concrete specimens were nominal than those of ordinary concrete specimens.

Keywords

Granite Powder, Fly Ash, Silica Fume, Superplasticiser, Concrete, Mechanical Properties, Shrinkage

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K. Dhanasekar ¹, P. Partheeban ²

Affiliations
1 Jawaharlal Nehru Technological University, Hyderabad, Andhra Pradesh, IN
2 St. Peters College of Engineering and Technology, Chennai, IN

Abstract

The present work is aimed to analyse physico-chemical characteristics of groundwater in a part area of Chennai, where agriculture is the main livelihood of rural and urban people and the groundwater is the main source for irrigation and drinking. It is noted that in Tamil Nadu, there is evidently much dependence on groundwater due to scarce surface water. Overexploitation of groundwater might lead to complex environmental situation. Hence, a thorough investigation of quality parameters is necessary to ensure the potability of water. The area taken for study purpose is Karayanchavadi which is a part of Chennai in the vicinity of Bay of Bengal. Groundwater samples were collected from 30 wells in the study area and analysed for pH, EC, TDS, TA, TH, Ca²⁺, Mg²⁺, Na⁺, K⁺, Cl^-, SO₄^-2, NO₃^- and F^-. A comparison of the groundwater quality in relation to drinking water quality was made. It was found that pH of all the samples was neutral to slightly alkaline. Fluorides, iron and calcium of 90% samples were within the permissible limits. Total dissolved solids, total hardness, sulphate and magnesium of all the samples were within the permissible limits.

Keywords

Agriculture, Groundwater, Water Quality, Chennai, Karayanchavadi.

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A. R. R. Kalaiyarrasi ¹, P. Partheeban ²

Affiliations
1 Department of Civil Engineering, St. Peter’s University, Avadi, Chennai-600054, Tamil Nadu, IN
2 St. Peter’s College of Engineering and Technology, Avadi, Chennai-600054, Tamil Nadu, IN

Abstract

The environmental impact of production of cement has left the construction industry with little choice but to develop an alternative material.Geopolymer synthesis has promising potential in that direction Alkali activation of alumino silicate raw marterialproduces geopolymer. Flyash is a widely used precursor in geopolymer. Flyash (FA) based geopolymer is porous and hence less durable. Metakaolin (MK) is rich in alumino silicate (Sio 2-52%, Al 2O 3-46%) and has smaller particle size (3.5 μm) and high specific area (20 m2/g) compared to flyash. MK based geopolymers are expected to give higher strength and less porous than FA based geopolymer. This research aims to investigate the use of MK asa precursor in geopolymer synthesis as a replacement for flyash in various percentages to utilize the advantages of MK over flyash. MK based concrete cured at different temperatures and various solid/liquid ratios are tested for compressive strength. Experimental investigation of FA-MK based geopolymer in this research is found to have 11% to 65% less compressive strength compared to FA based geopolymer when replaced by 10% to 40% of MK. Lesser strength is attributed to the Si/Al ratio of the MK precursor.

Keywords

Geopolymer Concrete, Metakaolin, Flyash, Compressive Strength, Alkali Activator and Sodium Silicate.

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C. Kanmalai Williams ¹, P. Partheeban ²

Affiliations
1 Department of Civil Engineering, St.Peter’s University, Avadi-600054, Chennai, IN
2 Department of Civil Engineering, St.Peter’s College of Engineering and Technology, Avadi-600054, Chennai, IN

Abstract

Disposal of waste rubber tyres has become a major concern in relation to the surrounding environment. This paper mainly focuses on the problems associated with waste tire disposal and the reuse of recycled rubber (RR) as coarse aggregate in new concrete construction. M20 and M40 concrete grades are mixed with recycled rubber which replaces coarse aggregate by the volume of 5, 10 and 15 percentages. Silica Fume (SF) and Plaster of Paris (POP) were replaced with cement content in various proportions such as 5, 10 and 15 percent. The experimental results show that when the percentage of recycled rubber increases the compressive strength of concrete decreases gradually. However silica fume has significant effects on the strength of concrete compared to POP.

Keywords

Recycled Rubber, Silica Fume, Plaster of Paris, Compressive Strength, Optimum Percentage.

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