本文選題：修補混凝土　切入點：耐久性　出處：《河北農(nóng)業(yè)大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著我國經(jīng)濟建設(shè)的迅速發(fā)展，建筑行業(yè)在經(jīng)歷大規(guī)模的建設(shè)期后，逐步開始轉(zhuǎn)變?yōu)樾陆ê途S修的并重時期，對既有混凝土結(jié)構(gòu)的修補加固逐漸成為建筑工程領(lǐng)域研究的一項重要內(nèi)容，修補混凝土的各項性能參數(shù)得到了更多專家的重視。判定修補加固的混凝土是否合格，不僅要修補后混凝土的強度達到規(guī)定值，其耐久性能也是重要的衡量指標。一般來說，混凝土結(jié)構(gòu)內(nèi)部的鋼筋銹蝕是引發(fā)結(jié)構(gòu)耐久性失效的主因，而氯離子侵蝕則是誘發(fā)鋼筋銹蝕的最主要因素�；诖耍疚囊曰炷量孤入x子侵蝕能力作為評判混凝土耐久性的重要指標，對各類修補后的混凝土進行氯離子滲透性能研究，探討不同修補狀態(tài)對修補混凝土強度、氯離子滲透性能的影響。 本文依托于河北省建設(shè)集團安徽分公司，在其馬鞍山市公安局業(yè)務(wù)技術(shù)用房改造工程項目中的對局部混凝土破損修補出現(xiàn)的若干耐久性問題的氯離子侵蝕部分，，進行相關(guān)的試驗研究。試驗通過對該工程中使用的兩種強度等級的混凝土C30和C40，同時外加設(shè)計C50混凝土進行交叉修補，觀測修補前后混凝土的抗壓強度和抗氯離子滲透能力，通過實驗數(shù)據(jù)的分析比較，研究修補狀態(tài)對補后混凝土性能的影響。試驗主要分為兩部分，一部分采用100100100mm3的混凝土立方體試塊，量測交叉修補前后抗壓強度的變化；另一部分采用φ10050mm3的混凝土圓柱體試塊，量測交叉修補前后抗氯離子滲透性能的變化；其中氯離子滲透試驗采用混凝土耐久性標準測定方法——快速氯離子遷移系數(shù)試驗方法。文中參照傳統(tǒng)的氯離子滲入模型，結(jié)合修補試驗結(jié)果，進行綜合分析，建立針對于修補混凝土的修正氯離子滲入模型；結(jié)合修補混凝土抗壓強度分析，提出“強滲比”概念，依此來評定最優(yōu)交叉修補混凝土組合，為工程實際局部破損的修補提供參考。 分析結(jié)果可以得出，在修補混凝土滿足強度要求的條件下，若原破損混凝土為低強度級別（C30）時，宜采用略高強度級別的混凝土進行修補，且不宜采用相對強度等級差別較大的混凝土進行修補；若原破損混凝土為高強度級別（C40）時，建議采用修補混凝土的強度級別不宜與原破損混凝土相差太大。
[Abstract]:With the rapid development of China's economic construction, the construction industry has gradually begun to change into a period of equal importance between new construction and maintenance after experiencing a large-scale construction period. The mending and strengthening of existing concrete structures has gradually become an important content in the field of building engineering. The performance parameters of repaired concrete have been paid more attention by many experts. Not only should the strength of the repaired concrete reach the specified value, but also its durability is an important index. Generally speaking, the corrosion of steel bar inside the concrete structure is the main cause of the structural durability failure. Chloride ion erosion is the main factor that induces the corrosion of steel bars. Based on this, the chloride ion permeability of various repaired concrete is studied based on the chloride corrosion resistance of concrete as an important index to evaluate the durability of concrete. The effect of different repair states on strength and chloride ion permeability of repaired concrete was discussed. This paper is based on Anhui Branch of Hebei Construction Group, and in its project of technical and technical renovation of technical housing of Ma'anshan Public Security Bureau, the chloride erosion part of some durability problems occurred in partial concrete damage repair, Through two kinds of strength grade concrete C30 and C40 used in the project, and the design of C50 concrete for cross-repair, the compressive strength and chloride permeable ability of the concrete before and after the repair were observed. Through the analysis and comparison of experimental data, the effect of repair state on the performance of post-repair concrete is studied. The experiment is mainly divided into two parts, one part is using 100100mm3 concrete cube test block to measure the change of compressive strength before and after cross-repair. The other part uses 蠁 10050mm3 concrete cylinder to measure the change of chloride penetration resistance before and after cross-repair. The chloride ion permeation test is based on the test method of fast chloride ion transport coefficient, which is the standard test method for durability of concrete. According to the traditional chloride ion infiltration model and the result of repair test, the comprehensive analysis is carried out. A modified chloride infiltration model for repairing concrete is established, and the concept of "strong permeability ratio" is put forward according to the analysis of compressive strength of repaired concrete, according to which the optimal cross-repair concrete combination is evaluated. It provides a reference for repairing the actual local damage of engineering. The analysis results show that if the original damaged concrete is of low strength grade C30, if the repair concrete meets the strength requirement, it should be repaired with slightly higher strength grade concrete. If the original damaged concrete is high strength grade C40, the strength grade of repaired concrete should not be too different from that of original damaged concrete.
【學位授予單位】：河北農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前4條

1 洪乃豐;混凝土中鋼筋腐蝕與結(jié)構(gòu)物的耐久性[J];公路;2001年02期

2 蔡光汀;;鋼筋混凝土腐蝕機理和防腐措施探討[J];混凝土;1992年01期

3 張益多,劉榮桂;混凝土結(jié)構(gòu)加固技術(shù)研究及應(yīng)用綜述[J];江蘇大學學報(自然科學版);2003年06期

4 陳肇元,徐有鄰 ,錢稼茹;土建結(jié)構(gòu)工程的安全性與耐久性[J];建筑技術(shù);2002年04期

本文編號：1595102