本文選題：檢查井　切入點(diǎn)：調(diào)平層　出處：《武漢理工大學(xué)》2015年碩士論文

【摘要】：一座城市的健康發(fā)展,少不了檢查井的重要作用,檢查井結(jié)構(gòu)包括井體基礎(chǔ)、井室、井筒、調(diào)平層、井圈、井蓋,但是在實(shí)際生活中,我們經(jīng)常可以看到車行道各類檢查井周邊混凝土的破壞現(xiàn)象。本文通過(guò)實(shí)地調(diào)查以及查閱相關(guān)文獻(xiàn),認(rèn)為檢查井周邊混凝土主要有兩方面原因,其一由于檢查井下部的調(diào)平層會(huì)受到反復(fù)的拉應(yīng)力和剪切力作用,薄弱的調(diào)平層首先出現(xiàn)破壞并出現(xiàn)沉降差,讓井體受到更大的沖擊力,加劇檢查井的破壞,另外井圈混凝土在車輛載荷作用下,也會(huì)受到反復(fù)的剪切力,產(chǎn)生疲勞破壞,其受到車輛載荷應(yīng)力和內(nèi)外溫度差形成的溫度應(yīng)力也會(huì)加速井圈混凝土的破壞。針對(duì)上述混凝土破壞原因并結(jié)合檢查井的結(jié)構(gòu)特點(diǎn),作者認(rèn)為調(diào)平層和井圈應(yīng)分別采用細(xì)石鋼纖維混凝土、聚丙烯纖維混凝土,并通過(guò)試驗(yàn)研究配制了新修檢查井周邊混凝土即調(diào)平層和井圈混凝土材料,和已經(jīng)破壞的檢查井周邊混凝土的修補(bǔ)材料。本文在實(shí)驗(yàn)室對(duì)調(diào)平層混凝土、井圈混凝土的材料組成、配合比及混凝土性能進(jìn)行了系統(tǒng)研究,并借助XRD、SEM對(duì)修補(bǔ)材料的水化機(jī)理進(jìn)行了分析、采用界面顯微硬度值對(duì)新老混凝土粘結(jié)性能規(guī)律進(jìn)行驗(yàn)證分析,研究表明:(1)在新修檢查井調(diào)平層混凝土中,當(dāng)混凝土中鋼纖維體積摻量為1%時(shí),28d抗折強(qiáng)度為13.73MPa,抗壓強(qiáng)度59.6MPa,劈拉強(qiáng)度為5.53MPa。(2)在新修檢查井井圈混凝土中,聚丙烯纖維體積摻量在0.10%時(shí),28d抗折強(qiáng)度為9.03MPa,抗壓強(qiáng)度53.6MPa,劈拉強(qiáng)度為4.06MPa,且耐磨度達(dá)到2.87千轉(zhuǎn)1/2/mm。(3)對(duì)于已破壞的檢查井的調(diào)平層混凝土修補(bǔ)材料中,在硫鋁酸鹽水泥摻量為15%時(shí)1d力學(xué)強(qiáng)度達(dá)到最高值,摻入5%的偏高嶺土后,對(duì)28d強(qiáng)度增長(zhǎng)較明顯,摻入1%的鋼纖維后,顯著增加了修補(bǔ)材料的韌性,1d抗折、抗壓強(qiáng)度分別達(dá)到8.98MPa、38.8MPa,完全能滿足1d通車標(biāo)準(zhǔn)。(4)結(jié)合XRD和SEM微觀測(cè)試手段分析修補(bǔ)材料對(duì)應(yīng)的凈漿的水化產(chǎn)物與結(jié)構(gòu)得知,硫鋁酸鹽水泥的摻入能促進(jìn)早期水化,但后期水化程度不足,偏高嶺土的摻入可以促進(jìn)二次水化反應(yīng),使28d凈漿水化結(jié)構(gòu)更加致密。(5)調(diào)平層修補(bǔ)材料中摻入5%的偏高嶺土后,28d粘結(jié)強(qiáng)度提高17.2%;修補(bǔ)材料中加入體積摻量為1%鋼纖維,1d粘結(jié)拉拔強(qiáng)度1.42MPa,28d達(dá)到2.35MPa,能滿足1d通車標(biāo)準(zhǔn)。(6)在已破壞的檢查井的井圈混凝土修補(bǔ)材料中,體系中摻入體積摻量為0.1%的聚丙烯纖維,1d井圈修補(bǔ)材料抗壓、抗折強(qiáng)度分別達(dá)到35.5MPa、6.32MPa,能滿足1d通車標(biāo)準(zhǔn),聚丙烯纖維亦能改善混凝土粘結(jié)性能,其中聚丙烯纖維的最佳摻量為0.1%,1d粘結(jié)拉拔強(qiáng)度達(dá)到1.26MPa,28d達(dá)到2.02MPa,均能滿足1d通車標(biāo)準(zhǔn)。
[Abstract]:The healthy development of a city is not without the important role of inspection wells, which include well body foundation, well chamber, wellbore, leveling zone, well ring, well cover, but in real life, We can often see the damage phenomenon of concrete around various inspection wells in the vehicular roadway. Through field investigation and reference of relevant documents, this paper thinks that there are two main reasons for the concrete around the inspection well. For one thing, the flattening layer at the bottom of the inspection well will be subjected to repeated tensile stress and shear force, and the weak leveling zone will first be destroyed and there will be settlement difference, which will make the well body suffer greater impact force and aggravate the damage of the inspection well. In addition, under the action of vehicle load, the well ring concrete will also be subjected to repeated shear stress, resulting in fatigue damage. The thermal stress caused by vehicle load stress and temperature difference between inside and outside will also accelerate the destruction of well ring concrete. In view of the above reasons of concrete failure and combined with the structural characteristics of the inspection well, The author thinks that the fine stone steel fiber concrete and polypropylene fiber concrete should be used in the leveling layer and the well ring respectively, and through the experimental study, the concrete around the new workover inspection well is made up, that is, the leveling layer and the well ring concrete material. In this paper, the material composition, mix ratio and concrete performance of leveling layer concrete and well ring concrete are systematically studied in laboratory. The hydration mechanism of the repair material is analyzed by means of XRDX SEM, and the bonding behavior of the new and old concrete is verified and analyzed by using the microhardness value of the interface. The results show that: 1) in the leveling layer concrete of the new inspection well, When the volume content of steel fiber in concrete is 1, the flexural strength is 13.73MPa, the compressive strength is 59.6MPa, and the splitting tensile strength is 5.53MPa.-2) in the concrete of the newly repaired inspection well, the bending strength is 13.73MPa, the compressive strength is 59.6MPa, and the splitting tensile strength is 5.53MPa.f. When the volume content of polypropylene fiber is 0.10, the flexural strength is 9.03 MPa, the compressive strength is 53.6 MPa, the splitting tensile strength is 4.06 MPA, and the wear resistance is 2.87 krpm / 2 / mm. When the content of sulphoaluminate cement is 15, the mechanical strength reaches the highest value at 1 day, and after adding 5% metakaolin, the strength increases obviously for 28 days, and when 1% steel fiber is added, the toughness of the repair material is increased significantly for one day, and the flexural strength of the mending material is obviously increased after the addition of 5% metakaolin. The compressive strength reached 8.98 MPA / 38.8MPa respectively, which fully met the 1d opening standard. (4) the hydration products and structures of the paste corresponding to the repair materials were analyzed by XRD and SEM microcosmic test methods. It was found that the incorporation of sulphoaluminate cement could promote the early hydration. However, the degree of hydration was insufficient in the later stage, and the incorporation of metakaolin could promote the secondary hydration reaction. The bonding strength was increased by 17.2% after the addition of 5% metakaolin into the leveling layer repair material, and the bond drawing strength of 1% steel fiber was increased by adding 1% steel fiber into the repair material in 28 days, and the bond drawing strength reached 2.35 MPa in 28 days, which can meet the requirement of 1 d pass. In the corrugated concrete repair material of damaged inspection wells, The polypropylene fiber with 0.1% volume added in the system can be used to repair the annulus under compressive pressure, and the flexural strength is up to 35.5MPa and 6.32MPa respectively, which can meet the standard of opening to traffic for one day, and the polypropylene fiber can also improve the bond property of concrete. The optimum content of polypropylene fiber is 0.1 g / d bonding and drawing strength is 1.26 MPA / 28d and 2.02MPa / d, which can meet the standard of opening to traffic for 1d.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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本文編號(hào)：1653309