Utilization Of Pine Wood Sawdust As Partial Replacement Of Sand In Concrete Production

Abstract

The Construction Industry Is Which Rapidly Growing Industry In Ethiopia And Concrete Is Being Widely Used In Construction Of Residential Buildings, The World Produces Thousands Of Tons Of Sawdust Annually From Wood Products And Furniture. Scarcity Of Fine Aggregate Due To Lack Of Source Nearby, Depletion Of Resources And Restriction Due To Environmental Consideration, Make Concrete Manufacturing Look For Suitable Alternative To Fine Aggregate. This Study Was Evaluated The Effect Of Pine Sawdust On Concrete Properties As Well As Durability Property Of Concrete. Sets Of Concrete Were Produced With Pine Sawdust At The Rate Of 5%, 10%, 15% And 20% By Volume Of The Fine Aggregate. Conventional Mix Ratio Of 1:2.56:3.43, And Water To Cement Ratio (W/C) Of 0.64 Was Also Adopted For The Concrete Production. The Slump Of The Fresh Concrete, The Setting Time Of Concrete, Density Of Concrete, Compressive Strength Of Concrete, Flexural Strengths Of Concrete, Water Absorption And Water Permeability Of The Hardened Concrete Were Tested In Accordance To Astm Procedures. Results Obtained From The Laboratory Tests Revealed That The Pine Sawdust Had Impact On The Mechanical Properties Of The Concrete. The Compressive And Flexural Strengths Of The Concrete Increase As Quantity Of Sawdust Increased From 5% To 10% And Then It Decreased, As The Quantity Of The Pine Sawdust Increased From 10% To 20%. Water Absorption And Water Permeability Of Concrete Increase As The Quantity Of Pine Sawdust Increased Due To The Fineness Of Sawdust Increased. When Compared To The Results Obtained From Concrete Produced Without Pine Sawdust, It Was Observed The Pine Sawdust Enhanced The Compressive And Flexural Strengths Of The Concrete Produced. Regression Analysis Of The Obtained Results Affirmed That Pine Sawdust Can Influenced The Mechanical Properties Of Concrete. Concrete Produced With 10% Pine Sawdust Had Higher A Pearson Correlation Coefficient With Concrete Without Pine Sawdust (Control Mix). Results Obtained From This Study Showed That It Is Possible To Save 66.50 Etb Or 1.8 % Of Cost For A Meter Cube Of Concrete In Ethiopia Using Sawdust By Replacing 10% Of Sand In The Concrete Without Compromising The Desired Strength. For Further Study, This Study Recommends Study On The Use Of Pine Sawdust With Super Plasticizers To Substitute Sand In C-20 Concrete Which More Than 10% Replacements.