本文選題：硅粉 + 復(fù)合纖維��； 參考：《西安建筑科技大學(xué)》2013年碩士論文

【摘要】：再生混凝土技術(shù)不僅能夠緩解日益嚴(yán)峻的資源短缺問(wèn)題，而且還可以很好地解決廢棄混凝土帶來(lái)的環(huán)境污染問(wèn)題，對(duì)節(jié)約能源、資源、減輕環(huán)境壓力及維持生態(tài)平衡都有十分重要的意義。但再生骨料在強(qiáng)度及密實(shí)度等方面都存在一些缺陷，用其制備的再生混凝土與普通混凝土也有一定差異。因此，為了擴(kuò)大再生混凝土的應(yīng)用范圍，加快其在實(shí)際工程中的應(yīng)用，有必要研究再生混凝土的改性方法以及改性再生混凝土構(gòu)件的抗震性能。 本文將課題組收集的廢棄混凝土制備成再生骨料，利用硅粉的填充及纖維的阻裂、增強(qiáng)、增韌作用，設(shè)計(jì)并制作了不同硅粉和纖維摻量的改性再生混凝土試塊并進(jìn)行了相應(yīng)的試驗(yàn)研究，接著以此為基礎(chǔ)，制作了5根改性再生混凝土和1根普通混凝土框架柱，通過(guò)偽靜力加載試驗(yàn)，研究了硅粉及纖維改性再生混凝土柱的抗震性能。主要工作及研究?jī)?nèi)容如下： （1）以不同摻量硅粉和兩種聚丙烯纖維為主要參數(shù)，設(shè)計(jì)制作了30組共90個(gè)混凝土試塊，分別為單摻硅粉、復(fù)摻硅粉和纖維等。通過(guò)試驗(yàn)，研究了硅粉及纖維改性再生混凝土試塊的立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、抗折強(qiáng)度、彈性模量及峰值應(yīng)變等，分析了硅粉及纖維對(duì)再生混凝土材料力學(xué)性能的影響，同時(shí)還研究了硅粉及纖維摻量變化時(shí)混凝土受壓的應(yīng)力-應(yīng)變曲線(xiàn)，給出了改性再生混凝土本構(gòu)模型的上升段方程。 （2）以某實(shí)際工程為原型，按1/2縮尺比例設(shè)計(jì)框架柱試驗(yàn)?zāi)Ｐ�，進(jìn)行低周反復(fù)荷載作用下的偽靜力試驗(yàn)，研究了再生粗骨料取代率為30%時(shí)，不同摻量硅粉和纖維再生混凝土框架柱的破壞模式、滯回性能、承載能力、延性、剛度和耗能能力等，并以試驗(yàn)結(jié)果為依據(jù)，分析了各性能指標(biāo)隨硅粉和纖維摻量變化的一般規(guī)律，，得出了一些可供參考的結(jié)論和建議。 （3）以文中建議本構(gòu)模型為基礎(chǔ)，結(jié)合已有研究結(jié)果，采用MATLAB軟件對(duì)改性再生混凝土應(yīng)力-應(yīng)變曲線(xiàn)主要參數(shù)進(jìn)行了改進(jìn)，并以此為依據(jù)進(jìn)行了各框架柱極限承載能力的計(jì)算，同時(shí)與《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB50010-2010）的計(jì)算結(jié)果和試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析，得出了較為準(zhǔn)確的硅粉及纖維改性再生混凝土柱承載能力的主要計(jì)算參數(shù)。 （4）采用文中建議的硅粉及纖維改性再生混凝土的本構(gòu)關(guān)系和參數(shù)設(shè)置，利用ANSYS有限元分析軟件，對(duì)上述試驗(yàn)?zāi)Ｐ椭M(jìn)行了數(shù)值模擬分析，得出了各試驗(yàn)?zāi)Ｐ椭芽p分布及走向、P滯回曲線(xiàn)及骨架曲線(xiàn)等，并與試驗(yàn)結(jié)果進(jìn)行了對(duì)比，兩者吻合較好，說(shuō)明文中建議的本構(gòu)模型比較合理，可用于相應(yīng)構(gòu)件的非線(xiàn)性有限元分析。 研究結(jié)果表明，摻入硅粉能夠提高再生混凝土的立方體抗壓強(qiáng)度，但峰值應(yīng)變相對(duì)普通再生混凝土有所下降；摻加纖維對(duì)其劈裂抗拉強(qiáng)度、抗折強(qiáng)度及峰值應(yīng)變等都有不同程度的提高，增幅大小相對(duì)不一致；硅粉及纖維混合摻入能夠改善再生混凝土的力學(xué)性能，但峰值應(yīng)變均較普通混凝土的低。 理論分析和試驗(yàn)研究結(jié)果均表明，硅粉及纖維改性再生混凝土柱的破壞模式與普通混凝土柱的相似；摻入適量硅粉能夠提高再生混凝土柱的承載能力和變形能力，但初始剛度有所降低，后期抗震性能衰減速率也隨摻量增加而加快；纖維的適量摻入可明顯提高硅粉改性再生混凝土柱的剛度、承載能力、變形和耗能能力等，是一種再生混凝土材料性能提高的有效途徑。
[Abstract]:In order to expand the application scope of recycled concrete and accelerate its application in practical engineering , it is necessary to study the modification method of recycled concrete and the aseismatic performance of modified recycled concrete .

In this paper , the waste concrete collected by the research group is made into recycled aggregate , and the filling of silicon powder and the resistance to crack , reinforcement and toughening of silicon powder are used to design and fabricate the modified recycled concrete test blocks with different silicon powder and fiber content . Then , five modified recycled concrete and one common concrete frame column are prepared . The anti - seismic performance of silicon powder and fiber - modified recycled concrete columns is studied by the pseudo - static loading test .

( 1 ) The compressive strength , axial compressive strength , splitting tensile strength , flexural strength , elastic modulus and peak strain of silicon powder and fiber modified recycled concrete specimen were studied by using different amount of silicon powder and two kinds of polypropylene fibers as main parameters . The influence of silicon powder and fiber on the mechanical properties of recycled concrete was studied .

( 2 ) Based on the experimental results , the failure mode , hysteretic behavior , bearing capacity , ductility , rigidity and energy dissipation capacity of the concrete frame column with different content of silicon powder and fiber were studied by designing the frame column test model according to the scale of 1 / 2 scale . The general rule of each performance index with the change of silicon powder and fiber content was analyzed based on the experimental results , and some conclusions and suggestions were obtained .

( 3 ) Based on the proposed constitutive model , the main parameters of the modified recycled concrete stress - strain curve are improved by using MATLAB software , and the calculation of ultimate bearing capacity of each frame column is carried out .

( 4 ) By using the constitutive relation and parameter settings of silicon powder and fiber modified recycled concrete as suggested in the paper , using ANSYS finite element analysis software , the numerical simulation analysis of the test model column is carried out , and the crack distribution and trend , P hysteresis curve and skeleton curve of each test model column are obtained . The results are in good agreement with the test results . The proposed constitutive model is reasonable and can be used for nonlinear finite element analysis of the corresponding components .

The results show that the compressive strength of recycled concrete can be improved by incorporating silicon powder , but the peak strain is lower than that of ordinary recycled concrete .
The tensile strength , flexural strength and peak strain of the doped fiber were improved to some extent , and the magnitude of the increase was relatively inconsistent .
The mixing of silicon powder and fiber can improve the mechanical properties of recycled concrete , but the peak strain is lower than that of ordinary concrete .

Theoretical analysis and experimental results show that the failure mode of silica powder and fiber - modified recycled concrete column is similar to that of ordinary concrete column ;
Adding proper amount of silicon powder can improve the bearing capacity and deformation capacity of the recycled concrete column , but the initial stiffness decreases , and the attenuation rate of the later anti - seismic performance increases with the increase of the mixing amount .
The proper amount of fiber can obviously increase the rigidity , bearing capacity , deformation and energy consumption of the regenerated concrete column , which is an effective way to improve the performance of recycled concrete material .
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU375.3;TU352.11

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