Abstract
The effect of microbial carbonate mineralization on increasing the hydrophobicity of the cement stone surface is theoretically justified and experimentally confirmed. Based on experimental studies and analysis of literature data, the main stages of microbial-induced sedimentation of calcium carbonate on the surface of a cement stone are formulated. Changes in the morphology of the cement stone surface due to crystalline new formations formed during biomineralization in the postgenetic period are described. It is shown that biocolmatation of the interstitial space of a cement stone by crystalline new formations leads to an increase in hydrophobicity, as evidenced by an increase in the contact wetting angle. The relationship between the change in the concentration of calcium in neoplasms and the average value of the contact wetting angle on the surface of the cement stone from the type of bacterial culture is established. According to chemical and morphological analysis of bioinduction tumors on the surface of samples and also evaluation of changes of the contact angle compared to the original index for cement, bacterial cultures are ranked in order to increase the efficiency of use for sedimentation of calcium carbonate with their participation, as well as increase of cement materials hydrophobicity in the following sequence: Sporosarcina pasteurii Bacillus megaterium Lysinibacillus sphaericus Bacillus pumilus.
Highlights
Установлена взаимосвязь между изменением концентрации кальция в новообразованиях и среднего значения контактного угла смачивания на поверхности цементного камня от вида бактериальной культуры
Changes in the morphology of the cement stone surface due to crystalline new formations formed during biomineralization in the postgenetic period are described
It is shown that biocolmatation of the interstitial space of a cement stone by crystalline new formations leads to an increase in hydrophobicity, as evidenced by an increase in the contact wetting angle
Summary
Установлена взаимосвязь между изменением концентрации кальция в новообразованиях и среднего значения контактного угла смачивания на поверхности цементного камня от вида бактериальной культуры. По данным химического и морфологического анализа биоиндуцированных новообразований на поверхности образцов, а также результатам оценки изменения контактного угла смачивания по сравнению с исходным показателем для цементного камня, бактериальные культуры проранжированы в порядке повышения эффективности использования для осаждения карбоната кальция при их участии, а также повышения гидрофобности цементных материалов в следующей последовательности: Sporosarcina pasteurii Bacillus megaterium Lysinibacillus sphaericus Bacillus pumilus.
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