Abstract
This study has focused on investigation of effect of hydrostatic pressure on the properties of underwater self-compacting concrete. In this research, 30 mixes of self-compacting concrete have been prepared with six groups. The first three groups contain AWA (Anti Washot Admixture), while the second groups made without AWA. The main parameters explored in this research were: silica fume, limestone powder and rice husk ash as a cement replacement content with 0% and 1% anti washout admixture and different water depth (10 ,20, 30 ,40 and 50 m). Washout loss was found by using either the CRD C61 test method or a newly developed device for simulation of increased hydrostatic pressure on the concrete/water interface. Good correlations were investigating between the standard washout loss determined according to CRD C61 and simulated threshold water head and corresponding maximum washout loss.
Highlights
Underwater concrete (UWC) is kind of high performance concrete that used since of the beginning of last century and until now and used in constructions under water especially in foundations of bridges, the high performance concrete is widely used in high loaded members and for more durable structures and in structures that subjected to severe conditions
Results of slump flow Slumps flow for Non Anti washout admixtures (AWA) concrete s mixes are 700mm for mixes contain silica fume, 750 mm for mixes contain lime stone powder and 760mm for mixes contain rice husk ash, while slumps flow for AWA concrete mixes are 500 mm for mixes contain silica fume, 515 mm for mixes contain lime stone powder and 500mm for mixes contain rice husk ash
Silica fume concrete with (0-1) % AWA dosage shows better washout resistance compared with similar concrete made with limestone powder and Rice husk ash by (42.4 – 18) % and (51.5 35) %, respectively
Summary
Underwater concrete (UWC) is kind of high performance concrete that used since of the beginning of last century and until now and used in constructions under water especially in foundations of bridges, the high performance concrete is widely used in high loaded members and for more durable structures and in structures that subjected to severe conditions. Small number of investigations on the influence of hydrostatic pressure on UWC properties are caused by the necessity of construction of the special testing stands. They are, generally, pressure tanks of special structure, enabling investigation on very small samples of concrete or mortar. This research project was undertaken to evaluate the effect of increased hydrostatic pressure and mixture parameters on washout loss and residual compressive strength of UWC. Washout loss was determined using either the CRD C61 test method or a special air pressurised tube that can simulate deep placements down to 50 m below the water surface. As well as seek to establish a relationship between washout loss and residual compressive strength determined using the same concrete samples that were used for measuring washout loss
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