Calcium Lactate addition in Bioconcrete: Effect on Compressive strength and Water penetration

Abstract

Abstract. This paper presents compressive strength and water penetration of bioconcrete with addition of calcium lactate. Bioconcrete has higher engineering concrete properties and durability compared to normal concrete but the natural production of calcium carbonate is limited to the calcium content in cement. Therefore, additional calcium is added as an additional calcium source to study the influence towards compressive strength and water penetration. The bacteria used in this research are Enterococcus faecalis and Bacillus sp. Calcium lactate was added into concrete mix in concentrations of 0.001mol/l, 0.005mol/l and 0.01mol/l of liquid used. The concentration of bacteria added into the mix is by partial replacement of water used in casting, which are 3% for Enterococcus faecalisand 5% for Bacillus sp. Both compressive strength and water penetration test used cubes of 150mm × 150mm × 150mm. The cubes were tested after 28 days. The result of compressive strength for control is 36 MPa while partial replacement of bacteria yields 38.2 MPa for 3% Enterococcus faecalisand 37.0 MPa for 5% Bacillus sp. Calcium lactate with 0.005 mol/L has the best performance with 42.8 MPa for Enterococcus faecalis and 39.6 MPa for Bacillus sp. Whereas for water penetration, the best concentration of calcium lactate which yielded the lowest water penetration is 0.01 mol/l for both Enterococcus faecalis and Bacillus sp which are 8.7 cm and 8 cm respectively. The addition of calcium lactate into bioconcrete is quite promising for improvement of concrete properties and durability.

El bioconcreto como agente reparante en estructuras de concreto

“…Cuando las moléculas de agua (H₂O) entran en los agrietamientos, activan las bacterias que se encuentran en estado latente y ocurre la precipitación de carbonato de calcio gracias a un compuesto (Irwan et al, 2016), el cual es un precursor de un mineral incorporado al concreto junto a todos sus compuestos (Pasnur y Jain, 2018). Estos compuestos pueden ser también nutrientes o alimento para las bacterias.…”

Experimental Study on Strength Parameters of Self Repairing Concrete

“…This process can be looked into a substitute mechanism to existing urease based system studies [18]. In this method calcium lactate, calcium acetate, and calcium nitrate are used as calcium nutrient source [19][20][21] and reported as this method will give better results in healing of cracks. Very few researchers have been studied the pathway by the accumulation of microorganisms along with calcium lactate.…”

Carbon Dioxide (CO2) Sequestration In Bio-Concrete, An Overview

“…However, the denitrification is the biological reduction of nitrogenous oxides to gaseous products during anaerobic (no oxygen) bacterial growth. Al-Thawadi [16] approved that, ureolytic bacteria (Bacillus) have the ability to precipitate calcium carbonation which used in many application such as removing contaminates and surface coating of monumental estuaries to improve the mechanical properties of the concrete especially sandy material.Furthermore, Bacillus bacteria has a great innovation to hydrolyzed urea to generate adenosine triphosphate (ATP) using the efflux of ammonium ions through ATP-synthase which in role produce carbonate. Whereas, the presence of calcium ions with excess amount, conformed that calcium carbonate will precipitate.…”

“…This type of concrete has the ability to accelerate the precipitation process of CaCO 3 in concrete pores [13][14][15][16]. Bio-concrete incorporating ureolytic bacteria such as Bacillus sphaericusproved that, theused of urease helps in mineralization of CaCO 3 and hydrolyzing urea that present in the environment.…”