Abstract
The pile foundation is usually designed to exceed the weak soil to the strong stratum. There is very close relation between the pile capacity and surrounding soil conditions. In cohesionless soil, the bored pile is effecting surround soil by loosening deposits through a combination of pile volume replacement and exist of pile case used for installation of bored pile. In this study, the improvement of the weak soil that surrounds the pile and observing the effect of improvement on pile increase the skin friction of the bored pile capacity for bored pile carried out. This study conducts research into the use of expansive additives in concrete bored piles. The aim of this project was to investigate how Na2Co3 as an additive in concrete can increase the shaft resistance of a bored pile. Several tests were conducted on concrete single piles with a variation of length to the diameter ratios and different percentages of soda ash additives. All tests were made in dry, sandy soil at loosening state. All tests showed that the shaft capacity could be increased using expansive additives due to increase the volume of the pile or enlargement of pile volume during concrete setting; it was also concluded that the shorter expansive piles could be able to achieve the same pile capacity as a longer conventional pile. This would lead to reductions on the volume of concrete poured, the amount of steel reinforcement used and the amount of soil excavated. Therefore, construction costs can be decreased and construction times can be shortened.
Highlights
In foundation practices, the main point of concern is bearing capacity of soil and settlement
The piles carry the vertical load from the superstructure by two means: end bearing resistance and shaft resistance, together known as pile capacity. Friction piles are those where the majority of the load is carried by shaft resistance, typically when the pile is not bearing on bedrock
Increasing the diameter of pile means increasing in the surface area of the shaft contact with the surrounding soil, which in turn will lead to increase in the shaft resistance
Summary
The main point of concern is bearing capacity of soil and settlement. The skin friction may not be being maximized, meaning that piled foundations may be being built deeper or wider than necessary This project aims to investigate whether the shaft resistance of a bored pile can be enhanced by using (Na2CO3) expansive additive. Expansive cement Expansive cement is a relative of Portland cement that contains materials that increase in volume as they set It usually uses with concrete mixtures in situations for situations where the shrinkage of conventional cement is undesirable or where the cement or concrete mixtures needs to create pressure on another part of a structure. Friction piles are those where the majority of the load is carried by shaft resistance, typically when the pile is not bearing on bedrock For such piles, and for piles where the base capacity is generally low, the shaft resistance is usually very important. By casting the pile using concrete containing expansive additives, the friction angle at the interface between the soil and the concrete pile could be increased, increasing the unit shaft friction and, the shaft resistance
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