Improvement of Concrete Materials by Bacterial-Mediated Precipitation

Pei Hao Li; Wen Jun Qu

doi:10.4028/www.scientific.net/AMR.306-307.455

Paper Titles

Study on the Stability and Phase Transition of Precipitated Phases Al₆Fe and Al₃Fe in Al-Fe Alloy
p.438

High Energy Micro-Arc Alloying of Mg-RE on AZ31 Mg Alloy
p.443

Surface Oxygen Diffusion Hardened Titanium Material TC4
p.447

Anomalous Change of the Electrical Resistivity and the Structure of Sn Melt with Temperature
p.451

Improvement of Concrete Materials by Bacterial-Mediated Precipitation
p.455

Die Optimal Design for a Large Diameter Thin-Walled Aluminum Profile Extrusion by ALE Algorithm
p.459

High Temperature Electrochemical Synthesis of Tungsten Boride from Molten Salt
p.463

A Fast Method for Determining Physical Properties of Slags with Contact Angle
p.467

Microstructure and Mechanical Behaviors of AZ91 Magnesium Alloy with Thermal Rate Treatment Technique
p.471

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Improvement of Concrete Materials by Bacterial-Mediated Precipitation

Abstract:

Microbial carbonate precipitation had been proposed as alternative technique for improvement in concrete materials. Laboratory experiments were conducted by bacterially mediated carbonate deposition on the surface and subsurface of concrete specimens. The crystal phase, morphology and growth of the crystal deposited on specimens as well as the efficiency of bonding and protection were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and ultrasonic test. Water absorption and the resistance of carbonation of concrete were analyzed by water absorptivity test and concrete accelerated carbonation test, respectively. Results show that phases of crystal are calcite and vaterite. The crystals are deposited uniformly on the surface of specimens. Biodeposotion effectively reduces capillary water uptake and carbonation rate constant.