饱和和非饱和地基原位碳酸钙加固
发布时间：2019-01-09 10:28
【摘要】：随着世界范围内对水泥的需求持续提升,水泥的生产过程对环境所产生的影响日益凸显,这促使世界各地的研究人员寻找新的替代胶凝剂。固然,目前阶段不可能找到新的功能全面的胶凝剂来完全替代水泥,但是对于水泥的部分替代都会对碳排放以及环境有着巨大的意义,这个研究领域的进步都将会一定程度地减少水泥的需求。基于此,本文拟详细研究其中一种新型有趣的替代品。微生物诱导碳酸盐沉积(MICP)是一项环境友好型土壤改性技术,近年来已受到众多研究者的关注。然而其由于使用活体微生物来处理土壤从而受到某些国家的禁止,其认为活体微生物会在耗尽土壤中的营养后进入休眠状态。已有相关研究讨论活体微生物在该改性技术中是否是必需的,例如有研究认为微生物细胞能够为碳酸钙沉积提供初始的必要的核。本文关于该课题进行如下三部分的论述。本文第一部分集中深入对于MICP技术的研究现状进行了文献综述,并对酶促碳酸盐沉积(ECP)技术进行介绍。该技术使用酶(植物酶、微生物释放的酶等)而不是活体微生物来作为催化剂从而诱导沉积的生成。这种技术对于那些禁止使用活体微生物的国家和地区而言是非常有意义的。第二部分讲述了本课题的实验部分。研究了不用活体微生物来诱导沉积生成的可能性,对不同种类的酶的效果都进行了研究和比较,菌液、上清液及植物酶所处理的样品UCS平均值分别为14.84±8.68 MPa、4.08±4.13 MPa及8.88±3.76 MPa;并比较了反向注入法和表面入渗法这两种广泛使用的灌浆方法的效果。表面入渗法制造了不饱和的灌浆环境从而使得碳酸盐沉淀生成在颗粒连接处等关键位置,从而能够提高了样品强度。本文检验了这一现象。反向注入法和表面入渗法所得样品的UCS平均值分别为19.71±5.86 Mpa及15.07±5.73 Mpa。本文所讨论的这项技术仍处于不断的发展过程中,所以目前就经济性而言仍不能满足当前相应产业的需求,只能应用于那些不十分重视经济性而是重视环境保护的领域。但随着该技术的不断发展完善,其成本会逐渐降低,从而在地基处理等行业成为水泥的一个可能的替代者。本文论述了该技术的一些实际应用,并对不同技术的经济性进行了简要介绍。
[Abstract]:With the increasing demand for cement worldwide, the environmental impact of cement production process has become increasingly prominent, which has prompted researchers around the world to find new alternatives to gelling agents. Although it is not possible at this stage to find a new fully functional gelling agent to completely replace cement, it is of great significance to carbon emissions and the environment for the partial replacement of cement. Progress in this area of research will reduce the demand for cement to a certain extent. Based on this, this paper intends to study one of the new and interesting alternatives in detail. Microbial induced carbonate deposition (MICP) is an environmental friendly soil modification technology, which has been paid attention by many researchers in recent years. However, it is prohibited by some countries because of the use of living microorganisms to treat soil, and it is believed that living microorganisms will be dormant after exhausting the nutrients in the soil. It has been discussed whether living microorganisms are necessary in this modification technology, for example, it is believed that microbial cells can provide the initial necessary nucleus for calcium carbonate deposition. This paper discusses this subject in the following three parts. In the first part of this paper, the research status of MICP technology is reviewed, and the (ECP) technology of enzymatic carbonate deposition is introduced. The technique uses enzymes (plant enzymes, enzymes released by microorganisms, etc.) rather than living microorganisms as catalysts to induce deposition. This technology is of great significance to countries and regions that ban the use of living microbes. The second part describes the experimental part of the subject. The possibility of inducing deposition without living microorganisms was studied. The effects of different enzymes were studied and compared. The average UCS values of samples treated with bacteria, supernatants and plant enzymes were 14.84 卤8.68 MPa, respectively. 4.08 卤4.13 MPa and 8.88 卤3.76 MPa; The results of two widely used grouting methods, reverse injection method and surface infiltration method, were compared. The surface infiltration method has made unsaturated grouting environment so that carbonate precipitates can be formed in the critical position of particle joint, thus the strength of the sample can be improved. This paper examines this phenomenon. The average UCS values of the samples obtained by reverse injection and surface infiltration were 19.71 卤5.86 Mpa and 15.07 卤5.73 Mpa., respectively. The technology discussed in this paper is still in the process of continuous development, so at present, it can not meet the needs of the corresponding industries in terms of economy, and can only be applied to those fields that do not attach great importance to economy but pay attention to environmental protection. However, with the continuous development and improvement of the technology, its cost will be reduced gradually, and thus become a possible substitute for cement in industries such as foundation treatment. This paper discusses some practical applications of this technology and briefly introduces the economy of different technologies.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU472
本文编号：2405501
[Abstract]:With the increasing demand for cement worldwide, the environmental impact of cement production process has become increasingly prominent, which has prompted researchers around the world to find new alternatives to gelling agents. Although it is not possible at this stage to find a new fully functional gelling agent to completely replace cement, it is of great significance to carbon emissions and the environment for the partial replacement of cement. Progress in this area of research will reduce the demand for cement to a certain extent. Based on this, this paper intends to study one of the new and interesting alternatives in detail. Microbial induced carbonate deposition (MICP) is an environmental friendly soil modification technology, which has been paid attention by many researchers in recent years. However, it is prohibited by some countries because of the use of living microorganisms to treat soil, and it is believed that living microorganisms will be dormant after exhausting the nutrients in the soil. It has been discussed whether living microorganisms are necessary in this modification technology, for example, it is believed that microbial cells can provide the initial necessary nucleus for calcium carbonate deposition. This paper discusses this subject in the following three parts. In the first part of this paper, the research status of MICP technology is reviewed, and the (ECP) technology of enzymatic carbonate deposition is introduced. The technique uses enzymes (plant enzymes, enzymes released by microorganisms, etc.) rather than living microorganisms as catalysts to induce deposition. This technology is of great significance to countries and regions that ban the use of living microbes. The second part describes the experimental part of the subject. The possibility of inducing deposition without living microorganisms was studied. The effects of different enzymes were studied and compared. The average UCS values of samples treated with bacteria, supernatants and plant enzymes were 14.84 卤8.68 MPa, respectively. 4.08 卤4.13 MPa and 8.88 卤3.76 MPa; The results of two widely used grouting methods, reverse injection method and surface infiltration method, were compared. The surface infiltration method has made unsaturated grouting environment so that carbonate precipitates can be formed in the critical position of particle joint, thus the strength of the sample can be improved. This paper examines this phenomenon. The average UCS values of the samples obtained by reverse injection and surface infiltration were 19.71 卤5.86 Mpa and 15.07 卤5.73 Mpa., respectively. The technology discussed in this paper is still in the process of continuous development, so at present, it can not meet the needs of the corresponding industries in terms of economy, and can only be applied to those fields that do not attach great importance to economy but pay attention to environmental protection. However, with the continuous development and improvement of the technology, its cost will be reduced gradually, and thus become a possible substitute for cement in industries such as foundation treatment. This paper discusses some practical applications of this technology and briefly introduces the economy of different technologies.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU472
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1 安德雷苏（Andres Quiros Castegnaro）;饱和和非饱和地基原位碳酸钙加固[D];清华大学;2015年
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