Open AccessEffect of bacteria on strength and porosity of M-sand based pumpable concrete
Author(s) -
P. Murthi,
K. Poongodi,
I. Rajasri Reddy
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/981/3/032078
Subject(s) - compressive strength , porosity , pervious concrete , absorption of water , curing (chemistry) , materials science , composite material , water–cement ratio , geotechnical engineering , cement , geology
This paper presents the results of experimental investigation which was carried out to evaluate the effect of bacteria on the compressive strength, porosity of M-sand concrete. The river sand was replaced by M-sand and M20 and M30grade pumpable concreteswere designed for investigation purpose. The w/c ratio of the concrete was selected as 0.45 and 0.4 respectively. Bacillus subtilis bacteria was included at a concentration of 30x10 5 cells/mL of water. The compressive strength, water absorption and porosity of concrete were determined after the curing periodof 3, 7, 28 and 90 days. Results were indicated that the substitution of M-sand instead of river sand was reduced the compressive strength up to 20% when compared with river sand based control concrete. The porosity and water absorptionbehaviour of M-sand concrete were observed in higher order than that of control concrete. On the addition of bacteria, 37%-45% reduction in water absorption and porosity level of bacterial M-sand concrete was achieveddue to the self-healing of micro crack in the concrete.