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Compare The Compressive Strength Of Concrete Using Borrow Pit Sand Quarry Dust

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INTRODUCTION 

A number of attempts have been made to provide local alternatives to the use of river sand as fine aggregate in conventional concrete. 

Recent developments in the building construction industry in Calabar, Southern Nigeria and it’s environ have witnessed air increasing use of borrow pit sand (laterite) generally referred to as sharp-sharp sand around the town for block moulding and concrete works. Some combine the sandy laterite with quarry dust and this practice has continued without any reliable data on the structural integrity of the resulting structures. This is worrisome given the spate of building collapses in some major cities of the country. The works of previous researchers on laterized concrete have not addressed this problem because of the differences in physical properties such as particle size distribution couple with low value of compressive strengths. 

Visual observation of the borrow pit material shows that the variation of sand is much sharper than those considered in previous works. This is confirmed by the preliminary assessment of its particle size distribution. There is therefore every reason to believe that this borrow pit sand can be used in structured concrete production. The particle sizes of aggregates are known to affect the strength properties of concrete greatly. 

In a related development, substantial quantities of quarry dust are found in heaps around Calabar in the crushed Rock sites. Quarry dust is known to be useful fillers in bituminous concrete. However, its continuous accumulation in recent times has become an environmental problem. It is logical that one way the knowledge of structural characteristics and performance of concrete made with these materials is necessary for the accurate design of structural elements in buildings and bridges. Compressive strength is arguably the most widely use strength parameter for concrete. This may be due to the nature of concrete, being strong in compression and weak tension. 

The focus of a good national Development is to look inwards with intent to mobilize all natural resources for economic purposes. One of the policy thrusts of the present government is to provide affordable housing for the people. The use of borrow pit sand in combination with quarry dust can help to achieve this purpose and impact positively in reducing the cost of building materials. This study aims at proper documentation of the materials to support their specification in design and construction. 




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