微生物诱导碳酸钙沉淀(MICP)利用微生物自身代谢产物诱导碳酸钙沉淀的形成,使生成的沉淀附着在颗粒表面及孔隙中,将原本松散的土颗粒胶结起来,达到固化土体的目的。选用巴氏芽孢八叠球菌,采用4种不同的固化方式来固化砂土,对固化后的砂...微生物诱导碳酸钙沉淀(MICP)利用微生物自身代谢产物诱导碳酸钙沉淀的形成,使生成的沉淀附着在颗粒表面及孔隙中,将原本松散的土颗粒胶结起来,达到固化土体的目的。选用巴氏芽孢八叠球菌,采用4种不同的固化方式来固化砂土,对固化后的砂柱进行表观分析、电镜扫描和无侧限抗压强度试验来对比不同固化方式对固化砂土强度的影响。试验发现:灌浆速率为50 m L/h的分步灌浆方式对砂土的固化效果要优于浸泡方式的固化效果,其无侧限抗压强度均值提高了15.58%,在同样浸泡的条件下,胶结液成分的改变使固化砂土的无侧限抗压强度均值提高了16.62%。此外,降低砂土饱和度,也是提高其固化效果的重要因素。展开更多
Bio-cement and bio-concrete are innovative solutions for sustainable construction, aiming to reduce environmental impact while maintaining the durability and versatility of building materials. Bio-cement is an eco-fri...Bio-cement and bio-concrete are innovative solutions for sustainable construction, aiming to reduce environmental impact while maintaining the durability and versatility of building materials. Bio-cement is an eco-friendly alternative to traditional cement, produced through Microbially Induced Calcium Carbonate Precipitation (MICP), which mimics natural biomineralization processes. This method reduces CO2 emissions and enhances the strength and durability of construction materials. Bio-concrete incorporates bio-cement into concrete, creating a self-healing material. When cracks form in bio-concrete, dormant bacteria within the material become active in the presence of water, producing limestone to fill the cracks, extending the material’s lifespan and reducing the need for repairs. The environmental impact of traditional cement production is significant, with cement generation accounting for up to 8% of global carbon emissions. Creative solutions are needed to develop more sustainable construction materials, with some efforts using modern innovations to make concrete ultra-durable and others turning to science to create affordable bio-cement. The research demonstrates the potential of bio-cement to revolutionize sustainable building practices by offering a low-energy, low-emission alternative to traditional cement while also addressing environmental concerns. The findings suggest promising applications in various construction scenarios, including earthquake-prone areas, by enhancing material durability and longevity through self-repair mechanisms.展开更多
文摘微生物诱导碳酸钙沉淀(MICP)利用微生物自身代谢产物诱导碳酸钙沉淀的形成,使生成的沉淀附着在颗粒表面及孔隙中,将原本松散的土颗粒胶结起来,达到固化土体的目的。选用巴氏芽孢八叠球菌,采用4种不同的固化方式来固化砂土,对固化后的砂柱进行表观分析、电镜扫描和无侧限抗压强度试验来对比不同固化方式对固化砂土强度的影响。试验发现:灌浆速率为50 m L/h的分步灌浆方式对砂土的固化效果要优于浸泡方式的固化效果,其无侧限抗压强度均值提高了15.58%,在同样浸泡的条件下,胶结液成分的改变使固化砂土的无侧限抗压强度均值提高了16.62%。此外,降低砂土饱和度,也是提高其固化效果的重要因素。
文摘Bio-cement and bio-concrete are innovative solutions for sustainable construction, aiming to reduce environmental impact while maintaining the durability and versatility of building materials. Bio-cement is an eco-friendly alternative to traditional cement, produced through Microbially Induced Calcium Carbonate Precipitation (MICP), which mimics natural biomineralization processes. This method reduces CO2 emissions and enhances the strength and durability of construction materials. Bio-concrete incorporates bio-cement into concrete, creating a self-healing material. When cracks form in bio-concrete, dormant bacteria within the material become active in the presence of water, producing limestone to fill the cracks, extending the material’s lifespan and reducing the need for repairs. The environmental impact of traditional cement production is significant, with cement generation accounting for up to 8% of global carbon emissions. Creative solutions are needed to develop more sustainable construction materials, with some efforts using modern innovations to make concrete ultra-durable and others turning to science to create affordable bio-cement. The research demonstrates the potential of bio-cement to revolutionize sustainable building practices by offering a low-energy, low-emission alternative to traditional cement while also addressing environmental concerns. The findings suggest promising applications in various construction scenarios, including earthquake-prone areas, by enhancing material durability and longevity through self-repair mechanisms.
