本文選題：超高性能混凝土 + 修補技術(shù)�。� 參考：《湖南大學》2015年碩士論文

【摘要】：超高性能混凝土(UHPC,Ultra-High Performance Concrete)是近20年發(fā)展起來的高強度、高韌性、低孔隙率的一種水泥基材料,因其具備多種優(yōu)良特性,UHPC被公認為是在未來極具有發(fā)展前景和應(yīng)用價值的一種復合材料。隨著UHPC的推廣應(yīng)用,對它的修補技術(shù)研究就提上了日程。最常用的混凝土修補方法是首先對要修補的混凝土基體表面進行粗糙處理,然后抹上一層界面劑,以提高界面的粘結(jié)強度,最后澆上新的混凝土修補材料并養(yǎng)護。一般新老混凝土粘結(jié)界面在收縮差或荷載作用下往往先破壞,是修補后結(jié)構(gòu)的薄弱界面,故粘結(jié)界面的性能是修補成敗的關(guān)鍵。針對摻有鋼纖維的超高性能混凝土高強特性,超高性能混凝土內(nèi)部隨機分布的高強鋼纖維對抗折韌性有著大力增強作用,尋找合適方法有效的處理好界面,在修補界面處保留鋼纖維并發(fā)揮其作用就顯得極為重要。本文嘗試探索研究超高性能混凝土的修補技術(shù),對摻加了鋼纖維的超高性能混凝土處理使用高壓水射流來鑿毛處理要修補的界面,試探采用聚合物改性超高性能混凝土作為修補材料,探索研究超高性能混凝土修補的可行技術(shù)方法,主要研究了以下內(nèi)容:1、對摻加了鋼纖維的超高性能混凝土修補界面,使用高壓水射流進行沖擊鑿毛加工,通過分析鑿毛處理界面對良好修補效果的需求,結(jié)合基材特性,調(diào)整高壓水射流設(shè)備的各項設(shè)置參數(shù)(工作壓力、刀口高度,刀口孔徑,刀頭行走速率,切割路線及間距等),得到鑿毛處理的合適參數(shù)值;2、實驗探索研究各種不同聚灰比的聚合物改性超高性能混凝土作為修補材料的可行性,通過測試抗彎拉強度、抗壓強度,以及結(jié)合施工作業(yè)的可操作性能,篩選出較優(yōu)聚灰比的聚合物改性超高性能混凝土材料。改性用的聚合物分別選用了丁苯乳液、可再分散膠粉、環(huán)氧乳液等;3、選用性能較佳的聚合物改性超高性能混凝土對UHPC基體進行修補實驗,通過測試對比經(jīng)修補后分別熱養(yǎng)護72小時和標養(yǎng)28d試件的抗彎拉強度,分析確定適合的修補材料和方法,形成可行的超高性能混凝土修補技術(shù)工藝流程。
[Abstract]:UHPC-High Performance concrete (UHPC) is a kind of cement-based material with high strength, high toughness and low porosity, which has been developed in recent 20 years.UHPC has been recognized as a kind of composite material with great development prospect and application value in the future because of its many excellent properties.With the popularization and application of UHPC, the research on its repair technology has been put on the agenda.The most commonly used method of concrete repair is to first roughen the surface of the concrete matrix to be repaired, then apply a layer of interface agent to improve the bond strength of the interface, and finally pour in new concrete repair materials and maintain them.Generally, the bond interface of new and old concrete is usually destroyed first under the action of shrinkage difference or load, which is the weak interface of the repaired structure, so the performance of the bond interface is the key to the success or failure of the repair.Aiming at the high strength characteristic of UHPC with steel fiber, the random distribution of high strength steel fiber in UHPC has a great effect on strengthening the flexural toughness, so we can find a suitable method to deal with the interface effectively.It is very important to retain the steel fiber at the repair interface and play its role.This paper attempts to explore and study the repair technology of UHPC. The high pressure water jet is used to repair the interface of UHPC treated with steel fiber.Using polymer modified ultra-high performance concrete (UHPC) as repair material, the feasible technique and method of UHPC mending are explored. The following content: 1 is studied, and the interface of UHPC with steel fiber added into UHPC is studied.The high pressure water jet is used to carry on the impingement hair-chiseling processing, by analyzing the requirement of good repairing effect of the hair-chiseling treatment interface, combining with the characteristic of the substrate, adjusting the setting parameters of the high-pressure water jet equipment (working pressure, cutting edge height, cutting edge aperture, etc.)The suitable parameter value of hair-chiseling treatment was obtained by using the cutting speed, cutting route and spacing. The feasibility of polymer modified ultra-high performance concrete with different ratio of polymer to cement was studied experimentally, and the flexural tensile strength was tested.The compressive strength and the maneuverability of the construction work are combined to select the polymer modified super-high performance concrete material with the optimum aggregate cement ratio.Butadiene emulsion, redispersible rubber powder, epoxy emulsion and so on were used to repair the UHPC matrix.The flexural tensile strength of the specimens after 72 hours of hot curing and 28 days of standard maintenance were tested and compared, and the suitable repair materials and methods were analyzed and determined to form a feasible technological process of super-high performance concrete repair.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1742451