The Comparative Study of Treated Sewage Water on Mechanical Properties of High Performance Concrete M40 with Conventional Concrete

Concrete, the widely used building material in construction industry.Cement is the primary constituent of concrete, during its production releases the large amount of carbon dioxide in the atmosphere creating the serious environmental threats like air pollution. The paper discuss the ways to reduce cement composition as building material, so that the construction industry will be more environment friendly by replacing the cement with fly ash to an extent. Fly ash is waste product in thermal power plants creatingdisposal problems on landfills.Treated water effluent from STPs are used in the preparation of concrete makes benefits to the environment. The study investigates the water quality tests like Ph, dissolved oxygen, turbidity, COD,BOD, TSS. The Mix proportions was obtained for the preparation of M40 grade concrete and the Destructive (compressive strength )tests and nonDestructive Tests (rebound hammer, ultrasonic pulse velocity test )was conducted and analysed and compared with conventional M40 grade concrete test values for different ages of concrete 7,14,28 days


Introduction
Concrete a most important Building material causes a large cement production in the world.Cement produces 2.5 billion tons of CO2 Causing a huge greenhouse effects over worldwide.Fly-ash is a by-product of thermal power plants which presently creating a serious waste Disposing Problem .This study highlights the application of percentage of fly-ash content in mixing the concrete, which slowlydecreases the production of cement to some extent .Fly-ash itself acts as a mineral admixtures and increases the life of concrete, plays a major role in reduction of Energyuse, decreases the amount of waste reaching to the landfills. Thus, usingfly-ash in the concrete is a eco-friendly. Constructionindustry, utilizes more amount of water in preparing the concrete, curing, of concrete blocks, curing of walls, using of water to clean the concrete mixer after utilization etc. In present scenario the increasing trend of water scarcity and water deficit in areas over the world leads to the conservation of water. The present study was done in order to reduce the usage of tap -water in construction industry, and to reuse the treated Sewage water, the treated water is used in concrete mix. Water, the key ingredient forms a paste when mixes with cement and forms a chemical bond through Hydration Process. The quality of water and amount of water used in concrete preparation plays a major role in the fresh and Hardened Properties IOP Publishing doi:10.1088/1757-899X/1006/1/012022 2 including Workability, Compressive strength,durability, Destructive Properties etc.The water parameters variations like chlorides , iron ,alkalinity inorganic salts shows their effects on initial strength , strength achievement ,bond between cement paste and aggregate ,property of concrete . To improve the properties Admixtures are added to concrete during freshly mixing and to achieve certain effectively. Water consumption for the Building construction of 1000 sq.ft  20000sq.m X 1000L/sq.= 20,000,000 L or 20000m 3 The demand or Availability of water varies with respect to season, with respect to source (either Ground water or tap water).In present Scenario the eventualities from the tanker costs Rs. 300 /m 3  300/m 3 X 20000m 3 = 60.00 lakhs

Methodology
In present study,Concrete cubes wasprepared withcement,sand, 20mm aggregates and collected treated water samples. Superplasticizer FOSROC SP 430 to maintain the workability .In the study M 40 grade concrete was selected.

Comprressive strength
This gives the capacity of the concrete to withstand loads. it gives all the characteristics of concrete , under the action of compressive forces , the resistance offered by the concrete can be measured

Water quality parameters
The treated water is analysed in the laboratory to determine the various parameters like Alkalinity,Ph,chloride, calciumchloride,iron,sulphates, Total dissolved and suspended salts The water quality for construction plays a major role in the initial strength of concrete, workability of

Results & discussions:
The concrete cubes of sizes 150X 150X150 mm 3 was prepared by the treated water and as well as with normal water has been tested for UPV, Rebound hammer, Compressive Strength and Dynamic Modulus of elasticity.

Conclusions
a. Based on the test results, the slight variations has been observed in the mechanical properties of concrete , when comparison was done between normal concrete and treated water concrete . b. The usage of treated water decreases the cost of construction to an extent in a place where tanker water are used in construction . c. Both reuse of treated water and utilization of flyash in construction is a eco-friendly method avoiding the dumping problem of waste in landfills and also conserving of fresh water . d. The variations was studied for 28 days test results having UPV 2.08%, Rebound hammer test 13.55% and compressive strength 4.67% . e. Rebound hammer test value indicates the long-term effects might show on the concrete prepared with treated water . f. The presence of chlorides in treated water shows its hardened effect causing the variation in compressive strength percentage