飽和和非飽和地基原位碳酸鈣加固
發(fā)布時間：2019-01-09 10:28
【摘要】：隨著世界范圍內(nèi)對水泥的需求持續(xù)提升,水泥的生產(chǎn)過程對環(huán)境所產(chǎn)生的影響日益凸顯,這促使世界各地的研究人員尋找新的替代膠凝劑。固然,目前階段不可能找到新的功能全面的膠凝劑來完全替代水泥,但是對于水泥的部分替代都會對碳排放以及環(huán)境有著巨大的意義,這個研究領(lǐng)域的進步都將會一定程度地減少水泥的需求�；诖�,本文擬詳細研究其中一種新型有趣的替代品。微生物誘導碳酸鹽沉積(MICP)是一項環(huán)境友好型土壤改性技術(shù),近年來已受到眾多研究者的關(guān)注。然而其由于使用活體微生物來處理土壤從而受到某些國家的禁止,其認為活體微生物會在耗盡土壤中的營養(yǎng)后進入休眠狀態(tài)。已有相關(guān)研究討論活體微生物在該改性技術(shù)中是否是必需的,例如有研究認為微生物細胞能夠為碳酸鈣沉積提供初始的必要的核。本文關(guān)于該課題進行如下三部分的論述。本文第一部分集中深入對于MICP技術(shù)的研究現(xiàn)狀進行了文獻綜述,并對酶促碳酸鹽沉積(ECP)技術(shù)進行介紹。該技術(shù)使用酶(植物酶、微生物釋放的酶等)而不是活體微生物來作為催化劑從而誘導沉積的生成。這種技術(shù)對于那些禁止使用活體微生物的國家和地區(qū)而言是非常有意義的。第二部分講述了本課題的實驗部分。研究了不用活體微生物來誘導沉積生成的可能性,對不同種類的酶的效果都進行了研究和比較,菌液、上清液及植物酶所處理的樣品UCS平均值分別為14.84±8.68 MPa、4.08±4.13 MPa及8.88±3.76 MPa;并比較了反向注入法和表面入滲法這兩種廣泛使用的灌漿方法的效果。表面入滲法制造了不飽和的灌漿環(huán)境從而使得碳酸鹽沉淀生成在顆粒連接處等關(guān)鍵位置,從而能夠提高了樣品強度。本文檢驗了這一現(xiàn)象。反向注入法和表面入滲法所得樣品的UCS平均值分別為19.71±5.86 Mpa及15.07±5.73 Mpa。本文所討論的這項技術(shù)仍處于不斷的發(fā)展過程中,所以目前就經(jīng)濟性而言仍不能滿足當前相應產(chǎn)業(yè)的需求,只能應用于那些不十分重視經(jīng)濟性而是重視環(huán)境保護的領(lǐng)域。但隨著該技術(shù)的不斷發(fā)展完善,其成本會逐漸降低,從而在地基處理等行業(yè)成為水泥的一個可能的替代者。本文論述了該技術(shù)的一些實際應用,并對不同技術(shù)的經(jīng)濟性進行了簡要介紹。
[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 鹵8.68 MPa, respectively. 4.08 鹵4.13 MPa and 8.88 鹵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 鹵5.86 Mpa and 15.07 鹵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.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU472
本文編號：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 鹵8.68 MPa, respectively. 4.08 鹵4.13 MPa and 8.88 鹵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 鹵5.86 Mpa and 15.07 鹵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.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU472
【相似文獻】
相關(guān)碩士學位論文 前1條
1 安德雷蘇（Andres Quiros Castegnaro）;飽和和非飽和地基原位碳酸鈣加固[D];清華大學;2015年
，本文編號：2405501
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