Insights into the multiple interactions between mineralizing microorganisms and Portland cement hydration products

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-09-29 DOI:10.1016/j.conbuildmat.2025.143798

Benqiang Pang , Xuan Zhang , Haitao Zhao , Qiwei Zhan , Chenpeng Song , Yong Liu , Shaojie Zuo

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引用次数: 0

Abstract

Microbial mineralization has been extensively studied for the modification of Portland cement-based materials. To investigate the coexistence of mineralizing microorganisms with hydration products of Portland cement, microorganisms were separately co-cultured with each individual hydration product. The results revealed a mutually exclusive relationship between the mass of microbially induced CaCO₃ and the conversion efficiency of calcium sources. Hydration products such as calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H), and Ca(OH)₂ (CH) significantly inhibited spore germination, while ettringite (AFt) and monosulfate (AFm) exhibited a retarding effect. C-S-H and CH had an inhibitory effect on growth of vegetative cells, while C-A-H, AFt and AFm had a promoting effect. The hydration products can improve the mineralization capacity of vegetative cells. Trace amounts of Ca^2 + positively influenced microbial growth, whereas Al(OH)₄^- and SiO₂(aq) had negative impacts, with SO₄^2- showing negligible effects. High concentrations of OH^- demonstrated significant inhibitory effects. Additionally, C-S-H induced spore agglomeration and adsorption, thereby preventing germination. However, C-S-H and vegetative cells were found to coexist stably over extended periods. The influence of hydration products on microorganisms was attributed to two mechanisms: physical adsorption and chemical inhibition by dissolved ions. These findings provide insights into the interference mechanisms affecting microbial mineralization in cement-based materials.

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矿化微生物与硅酸盐水泥水化产物之间多重相互作用的深入研究

微生物矿化在硅酸盐水泥基材料的改性方面得到了广泛的研究。为了研究矿化微生物与硅酸盐水泥水化产物的共存情况，将微生物与每种水化产物分别共培养。结果表明，微生物诱导的CaCO3质量与钙源转化效率之间存在互斥关系。水化产物水化硅酸钙（C-S-H）、水化铝酸钙（C-A-H）和钙（OH）2 （CH）对孢子萌发有显著抑制作用，钙矾石（AFt）和单硫酸盐（AFm）对孢子萌发有抑制作用。C-S-H和CH对营养细胞的生长有抑制作用，C-A-H、AFt和AFm对营养细胞的生长有促进作用。水化产物能提高营养细胞的矿化能力。微量的Ca2 +对微生物生长有积极影响，而Al(OH)4-和SiO2（aq）有负面影响，SO42-的影响可以忽略不计。高浓度OH-表现出明显的抑制作用。此外，C-S-H诱导孢子团聚和吸附，从而阻止萌发。然而，C-S-H和营养细胞在很长一段时间内稳定共存。水化产物对微生物的影响有两种机制：物理吸附和溶解离子的化学抑制。这些发现为水泥基材料中影响微生物矿化的干扰机制提供了见解。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.