Influences of bacteria-based self-healing agents on cementitious materials hydration kinetics and compressive strength

Luo, Mian; Qian, Chunxiang

doi:10.1016/j.conbuildmat.2016.06.075

Cited by 121 publications

(25 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Through microbial biocementation, calcium carbonate is deposited in cement mortar or concrete matrix. Such deposits have recently emerged as promising binders for protecting and consolidating various building materials [3, 6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar

Mutitu

Wachira

Mwirichia

et al. 2019

Heliyon

View full text Add to dashboard Cite

Cement structures are subject to degradation either by aggressive media or development of micro/macro cracks which create external substance ingress pathways. Microbiocementation can be employed as a self-intelligent solution to this deterioration process. This paper presents study results on the effects of Lysinibacillus sphaericus microbiocementation on Ordinary Portland cement (OPC), normal consistency, setting time, soundness, compressive strength and water sorptivity. Microbial solutions with a concentration of 1.0 × 107 cells/ml were mixed with OPC to make prisms at a water/cement ratio of 0.5. Mortar prisms of 160 mm × 40 mm x 40mm were used in this study. A maximum compressive strength gain of 17% and 19.8% was observed on the microbial prism at the 28th and 56th day of curing respectively. A minimum of 0.0190 and a maximum of 0.0355 water sorptivity coefficient was observed on the OPC microbial prism and OPC control prism, after 28th day of curing respectively. Scanning electron microscope images taken after the 28th day of curing showed formation of vast calcium silicate hydrates and more calcite deposits on microbial mortars. Statistical findings of this study indicate that Lysinibacillus sphaericus significantly retarded both the setting time and normal consistency, but has no influence on the mortar soundness.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar

Mutitu

Wachira

Mwirichia

et al. 2019

Heliyon

View full text Add to dashboard Cite

show abstract

“…These samples were investigated for the identification of isolated bacteria. Table 1 lists the investigated data [25][26][27][28][29].…”

Section: Methodsmentioning

confidence: 99%

Experimental Study on Strength Parameters of Self Repairing Concrete

Reddy¹,

Kavyateja²

2019

ACSM

View full text Add to dashboard Cite

The microbial self-healing concrete has been a new technology to repair cracks, the former study showed that the precipitated CaCO3 could fill the cracks and reduce the permeability coefficient of cracks. This paper presents the effect on strength parameters with the addition of bacillus subtilis bacteria and calcium lactate. This study helps to improve the strength of self-repairing concrete with the use of bacillus subtilis bacteria and calcium lactate. The production of calcium carbonate in bacterial concrete is limited to the calcium content in cement. Hence calcium lactate is externally added to be an additional source of calcium in the concrete. The influence of this addition on compressive strength and modulus of rupture are highlighted in this study. The Bacillus subtilis bacteria and calcium lactate are mixed in concrete with different concentrations and tested for compressive and modulus of rupture of concrete. The results show that the performance of concrete improves with the addition of bacillus subtilis bacteria and calcium lactate into concrete.

show abstract

“…Recently, much emphasis has been placed on using bacteria-induced precipitation to heal cracks (Tittelboom et al 2010;Jonkers et al 2010;Khaliq and Ehsan 2016;Lors et al 2017;Tziviloglou et al 2016). In general, a bacteria-based self-healing system consists of alkali resistant spore-forming bacteria and some material used for the reaction, which are added to concrete during the repair process (Luo and Qian 2016;Wiktor and Jonkers 2011). Considering the many constraints, a large variety of bacterial suspensions for microbiallyinduced carbonate precipitation (MICP) in various materials and environments have been proposed (Tittelboom et al 2010;Tziviloglou et al 2016;Sierra-Beltran et al 2014;Zhan et al 2016;Luhar and Gourav 2015).…”

Section: Introductionmentioning

confidence: 99%

Adding Aluminum Oxide to Improve the Repairing Effect of Cracks Based on Bio-Remediation

Sun

Miao

Chen

2019

ACT

View full text Add to dashboard Cite

A novel method of adding aluminum oxide to improve the efficiency of bio-remediation was evaluated. Aluminum oxide, at various amounts, was added to the medium to obtain a change in pH and urease activity. Urea and calcium salts with various amounts of aluminum oxide, were mixed with an absorbance-fixed bacterial suspension to analyze the effect of the method on production rates for calcium carbonate. Concrete specimens in which precracking was induced were subjected to bio-remediation with different amounts of added aluminum oxide. Adding aluminum oxide can decrease the pH of the environment, providing a more suitable micro environment and improving urease activity of bacteria. Moreover, the method can increase the adsorption of germs to increase the utilization rate of urea and production rate for calcium carbonate. After repairing, those with added aluminum oxide were better repaired and their strengths were higher. Therefore, the method can accelerate the bio-remediation reaction and reduce repairing time.

show abstract

Influences of bacteria-based self-healing agents on cementitious materials hydration kinetics and compressive strength

Cited by 121 publications

References 17 publications

Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar

Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar

Experimental Study on Strength Parameters of Self Repairing Concrete

Adding Aluminum Oxide to Improve the Repairing Effect of Cracks Based on Bio-Remediation

Contact Info

Product

Resources

About