A STUDY OF EFFECT OF HIGH VELOCITY SEDIMENT-LADEN WATER ON CONCRETE

Abstract

In general concrete surfaces are subjected to wear and tear and abrasion caused by sliding, scraping or percussion etc., but in case of hydraulic structures the concrete surface are subjected to the action of abrasive materials carried by high speed flowing water. The erosion due to abrasive action of high velocity water carrying suspended load, viz., boulders, shingles, sands, debris, silts etc. is a serious problem in hydraulic structures. The different components viz, crest and body of spillway, apron sluices, guide walls, stilling basin, turbine blades, gates penstocks, etc. are subjected to water borne forces which cause erosion on the surface and damage the structures. Therefore, these parts of the structures are required to be protected against erosion. The basic aim of the study is to qualitatively simulate the behaviour of swirling water containing suspended and transported solid that produce abrasion of the substrates, pot holes and related effects. The significance and use of the experimental method is to provide a relative evaluation of the resistance of surface of concrete to such action. This study will also provide -a quantitative-measurement of the length of service that may be expected from a specific grade of concrete. The results are expected to be useful in selection of materials, mix as and construction practices based on the experimental work for use where such action is to be expected.....