【摘要】：鋼-PVA混雜纖維增強水泥基復(fù)合材料是通過在混凝土中摻入鋼和PVA纖維來取代混凝土材料中粗骨料的方式制備而成。已有的關(guān)于纖維增強水泥基復(fù)合材料的研究成果顯示：(1)鋼纖維可以有效地提高混凝土的動態(tài)抗壓強度；(2) PVA纖維可以有效地提高混凝土的沖擊韌性等。正因如此，本課題著手將鋼和PVA纖維進行一定規(guī)律地混雜，制備了4種不同混雜方式的鋼-PVA混雜纖維增強水泥基復(fù)合材料；針對各配比材料分別在單次和多次反復(fù)動力沖擊壓縮試驗，研究了該種纖維增強水泥基復(fù)合材料的動態(tài)力學性能，可以為纖維增強水泥基復(fù)合材料的制備、研究以及相應(yīng)結(jié)構(gòu)的設(shè)計和優(yōu)化提供參考，具有重要的科學研究意義和工程實用價值；對所獲取的試驗數(shù)據(jù)進行歸納總結(jié)并分析纖維體積摻量為2%鋼-PVA混雜纖維增強水泥基復(fù)合材料在動力沖擊壓縮荷載作用下的力學行為，再從各配比材料的破壞形態(tài)、動態(tài)增強效應(yīng)以及韌度等角度進行橫縱向?qū)Ρ�，分析鋼纖維和PVA纖維在4種混雜形式下各自配比材料的受力特性，以及最優(yōu)的纖維混雜形式。 本文首先對國內(nèi)外關(guān)于纖維增強水泥基復(fù)合材料的研究進行了簡要的綜述，同時介紹了水泥基類材料動態(tài)力學性能的研究狀況。已有的研究成果表明該材料在動態(tài)和靜態(tài)情況下的力學特性具有顯著的區(qū)別，而關(guān)于水泥基類材料在高應(yīng)變率下動態(tài)沖擊試驗研究數(shù)據(jù)的可靠性還存在一定的爭議，對該類材料動態(tài)力學行為的描述也未能達成統(tǒng)一。分離式霍普金森壓桿（SHPB）試驗技術(shù)是目前用于測試材料高應(yīng)變率下動態(tài)增強效應(yīng)的常用試驗手段，本文針對鋼-PVA混雜纖維增強水泥基復(fù)合材料SHPB試驗技術(shù)存在的問題提出了相應(yīng)的解決方案。 本文重點研究纖維體積摻量為2%的鋼-PVA混雜纖維增強水泥基復(fù)合材料在動靜荷載作用下抗壓力學性能的研究。通過對所設(shè)計的四種不同纖維含量的材料配比進行準靜態(tài)和多種沖擊氣壓值下的單軸動態(tài)沖擊壓縮試驗，試分析比較各配比材料性能的優(yōu)劣性能。為了保證試驗的可靠性及試驗數(shù)據(jù)的有效性，本次SHPB試驗考慮了入射波形、應(yīng)變率范圍、端面摩擦及慣性效應(yīng)等主要影響因素。經(jīng)過整理相關(guān)試驗數(shù)據(jù)，得出了以下幾點結(jié)論：纖維對水泥基體材料在抗壓和韌度方面都存在增強效應(yīng)，且動力增強因子與應(yīng)變率對數(shù)之間存在著一定的曲線關(guān)系；鋼-PVA混雜纖維增強水泥基復(fù)合材料在不同氣壓值的SHPB試驗中表現(xiàn)出了明顯的動力增強、增韌應(yīng)變率效應(yīng)，從總體力學性能參數(shù)上來看，纖維的摻入對此種混雜纖維材料的改性增強作用明顯，，其中以鋼纖維的摻入增強效果最為顯著。而摻入PVA纖維則有利于材料在動力沖擊下峰值應(yīng)變的提高，并經(jīng)過綜合對比3號配比材料（1%Steel+1%PVA）抵抗動力沖擊壓縮能力最好。
[Abstract]:Steel-PVA hybrid fiber reinforced cement matrix composites were prepared by adding steel and PVA fibers in concrete instead of coarse aggregate in concrete. The existing research results on fiber reinforced cement matrix composites show that: (1) steel fiber can effectively improve the dynamic compressive strength of concrete; (2) PVA fiber can effectively improve the impact toughness of concrete and so on. Therefore, in this paper, the steel and PVA fibers were mixed regularly, and four kinds of steel-PVA hybrid fiber reinforced cement matrix composites were prepared. In this paper, the dynamic mechanical properties of the fiber reinforced cement matrix composites were studied by single and multiple repeated dynamic impact compression tests, which can be used to prepare the fiber reinforced cement matrix composites. The research as well as the design and optimization of the corresponding structure provide reference, which has the important scientific research significance and the engineering practical value; The experimental data obtained are summarized and analyzed. The mechanical behavior of 2% steel PVA hybrid fiber reinforced cement matrix composites under dynamic impact compression loading is analyzed. The dynamic strengthening effect and toughness were compared horizontally and longitudinally to analyze the mechanical properties of steel fiber and PVA fiber in each of the four hybrid forms, as well as the optimal fiber hybrid form. In this paper, the research on fiber reinforced cement matrix composites at home and abroad is reviewed briefly, and the research status of dynamic mechanical properties of cement based materials is also introduced in this paper. The existing research results show that the mechanical properties of the material under dynamic and static conditions have significant differences, but the reliability of dynamic impact test data for cement based materials at high strain rate is still controversial. The description of the dynamic mechanical behavior of this kind of materials is not uniform. Split Hopkinson pressure bar (SHPB) test technique is a common method for testing dynamic enhancement effect of materials at high strain rate. In this paper, the corresponding solutions to the problems existing in the SHPB test technology of steel-PVA hybrid fiber reinforced cement matrix composites are put forward. In this paper, the compressive mechanical properties of steel / PVA hybrid fiber reinforced cement matrix composites with 2% fiber volume content under dynamic and static loads are studied. Through the uniaxial dynamic impact compression test of four kinds of materials with different fiber content under quasi-static and multiple impact pressure values, the properties of the materials were analyzed and compared. In order to ensure the reliability of the test and the validity of the test data, the main factors affecting the incident waveform, strain rate range, end surface friction and inertia effect are considered in this SHPB test. After finishing the relevant test data, the following conclusions are drawn: fiber to cement matrix material in compressive strength and toughness, and there is a certain relationship between the dynamic strengthening factor and the logarithm of strain rate; Steel-PVA hybrid fiber reinforced cement matrix composites show obvious dynamic strengthening and toughening strain rate effect in SHPB test of different pressure values. The effect of fiber admixture on the modification and reinforcement of the hybrid fiber is obvious, especially steel fiber. The addition of PVA fiber is beneficial to increase the peak strain of the material under dynamic impact, and through comprehensive comparison, the ratio 3 material (1%Steel 1%PVA) has the best resistance to dynamic impact compression.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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