The effect of biomolecules on enzyme-induced calcium carbonate precipitation in cementitious materials

Baffoe, Elvis; Ghahremaninezhad, Ali

doi:10.1016/j.conbuildmat.2022.128323

Cited by 20 publications

(33 citation statements)

References 114 publications

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“…The low flexural strength recovery exhibited by the control prism may be attributed to autogenous healing as a result of the hydration of the unreacted cement clinker and CaCO 3 formation. 7 A similar flexural strength recovery was observed in a previous study by Baffoe and Ghahremaninezhad. 9 It must, however, be mentioned that the healing solution used in the previous study was DW.…”

Section: Flexural Strength Recoverysupporting

confidence: 87%

“…This is consistent with the observation made in our previous study 9 and corresponds to the higher flexural strength recovery observed in Figure 7. SBI has a higher affinity toward hydrated cement paste, as revealed in a previous study, 7 and can effectively adsorb onto the cracked cement paste, self-assemble, and form a gel to bind the crack surfaces together. Cement mortar prisms healed in SBI-SPS-SDS, shown in Figure 8f, also exhibited complete crack closure.…”

Section: Crack Closurementioning

confidence: 58%

“…Because this pH is above the isoelectric points of the proteins, the proteins may undergo molecular and conformational changes and begin to unfold to expose their hydrophobic groups. 7 It is seen that generally the surface tension of the proteins did not vary with time; that is, the surface tension remained similar throughout the 24-h period. The relatively lower surface tension of the proteins in SPS-SDS is largely contributed by the hydrophobicity of the SDS because reports indicate that SDS is hydrophobic in nature.…”

Section: Surface Tensionmentioning

confidence: 88%

“…The interaction between proteins, amino acids, and calcium silicate hydrate, which constitutes the primary binding phase in cementitious materials was also examined by Kamali et al 18 Prior studies investigated the properties of the proteins, bovine serum albumin (BSA) and human serum albumin, as binders in developing biocomposites for space construction applications. 19 While the concept of biocementation for crack healing of cementitious materials has been extensively studied in the past, 7,11 the effect of organic biomolecules in the biocementation process for the crack healing of cementitious materials has not received attention and is not fully understood. Baffoe and Ghahremaninezhad 7 evaluated the influence of proteins on the biocementation process applied to loose ground-hardened cement paste powder and observed enhanced mechanical binding and lower porosity in the consolidated sample.…”

Section: Introductionmentioning

confidence: 99%

“…19 While the concept of biocementation for crack healing of cementitious materials has been extensively studied in the past, 7,11 the effect of organic biomolecules in the biocementation process for the crack healing of cementitious materials has not received attention and is not fully understood. Baffoe and Ghahremaninezhad 7 evaluated the influence of proteins on the biocementation process applied to loose ground-hardened cement paste powder and observed enhanced mechanical binding and lower porosity in the consolidated sample. Almajed et al 20 also observed improved mechanical performance of consolidated loose sand treated with biocementation modified with casein protein.…”

Section: Introductionmentioning

confidence: 99%

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Crack Binding and Filling Properties of Modified Proteins in Sustainable Cementitious Materials

Baffoe,

Ghahremaninezhad

2023

ACS Appl. Eng. Mater.

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This study aims to investigate the effect of two modifying agents, sodium dodecyl sulfate (SDS) and lignin, on the properties of five different proteins and their crack binding and filling in the cementitious surface. The molecular structure and physicochemical properties of the modified proteins were examined using Fourier transform infrared (FTIR), differential scanning calorimetry, ζ-potential, and surface tension measurements. The binding between the modified proteins and the cementitious surface was evaluated using the interfacial shear lap test. The effect of the modified proteins on crack filling and healing of cementitious materials was studied by using flexural testing, optical microscopy, and X-ray microcomputed tomography. FTIR showed reduced intensities of the amide groups in the molecular structure of the modified proteins compared with the unmodified proteins. Proteins showed an increased viscosity in the synthetic pore solution (SPS) compared to that in deionized water, due to protein unfolding at a high pH of the SPS and subsequently cross-linking via Ca2+ bridging. Modifying with SDS generally increased the viscosity of the proteins due to increased cross-linking, while lignin did not seem to change viscosity. The proteins modified with SDS and lignin exhibited a general increase in interfacial shear strength between the modified proteins and the cementitious surface. It was found that modifying the protein sodium bovine immunoglobulin with SDS enhanced the crack healing and filling in cementitious materials, while modifying with lignin was not effective.

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Section: Flexural Strength Recoverysupporting

confidence: 87%

Section: Crack Closurementioning

confidence: 58%

Section: Surface Tensionmentioning

confidence: 88%