Effect of sea water on strength of concrete made by river sand and sea sand

Abstract

Constructions across seashore increasing day by day (likely road pavements, bridges, hotels etc.,) But these are facing so many challenges by less availability chances of normal sand, water and huge amount of availability of saline sand, water. Sea water has 35ppt of an average salinity but in some places around shoreline salinity of ground water may vary from 0 to 35ppt due to humidity and temperature of ground surface. It will effect on durability of constructions at shore. In this investigation, the effect of saline content on M40 grade concrete(for road pavements)made by river sand and sea sand with partial and complete replacement of sea water specimen strength was studied. Total 216 specimens were casted using PPC cement in that 108 were casted using river sand and 108 were casted using sea sand with partial and complete replacement of sea water to test 7,14,28 days compressive & split-tensile strength of concrete specimens. Compressive strength test was conducted on cubes and Split-tensile strength was conducted on cylinders. PPC (fly ash based) cement is preferable for marine constructions due to its low heat of hydration and it has good resistance against saline attack. Sea water replaced as by 20%, 40%, 60%, 80% and 100% with normal water for different salinity ranges of water. Salinity was tested by Salinity Refractometer. River sand was collected from Vamsadhara River near srikakulam and sea water and sand was collected from kalingapatnam near srikakulam.