Effect Of Different pH Waters On Compressive Strength & Tensile Strength Of Concrete

Abstract

The present study deals about the behavior of concrete in terms of compressive strength and
tensile strength when it is casted with three pH waters (4, 7 and 9) separately. The casted cubes are cured
with normal pH water and were tested at the end of 3, 7 and 28 days respectively. Results indicate that after
three days the Mean compressive strength at pH 4, pH 7 and pH 9 are 14.65, 14.76 and 14.33 N/mm2
respectively, which indicates there is no much variation in the compressive strengths. After 7 days and 28
days duration there is a slight gradual increase in strength from pH 4 to pH 9 respectively. Maximum
compressive strength is observed at pH 9 (40.13N/mm2
) which may be due to aggregate alkali reaction set to
be faster as neutral water. After 3 days the Mean Split Tensile Strength at pH 4, pH 7 and pH 9 are 4.35,
4.41 and 4.45 N/mm2
respectively, which indicates there is no much variation in the split tensile strengths.
This may be because of undisputed parameters between neutral, acidic & alkaline water. After 7 days there
is a slight gradual increase in strength from pH 4 to pH 9 (5.66 to 5.89 N/mm2) respectively. Maximum
mean tensile strength (6.72 N/mm2
) is observed at pH 9. As there is no much variation in the compressive
and split tensile strength values if the concrete made up of different three pH waters (4, 7 and 9) they can be
used for initial blending only but not for curing as the cubes in the present study is cured with normal water.