發(fā)布時間：2018-06-09 15:54

  本文選題：鋼纖維 + 橡膠顆粒��； 參考：《浙江工業(yè)大學(xué)》2016年碩士論文

【摘要】：本文研究了一種新型環(huán)保高性能復(fù)合混凝土材料——鋼纖維改性橡膠混凝土。將廢舊輪胎粉碎后制成的橡膠顆粒摻入到混凝土中減輕了橡膠輪胎對環(huán)境的污染還能改善混凝土斷裂韌性、抗沖擊性、疲勞性能,但仍無法擺脫混凝土抗拉抗折強度低的缺點。摻入鋼纖維可以發(fā)揮其增強增韌、抗拉抗折等特點,解決了摻入橡膠導(dǎo)致混凝土基本力學(xué)性能下降的問題,兩者能夠發(fā)揮協(xié)同效應(yīng),從而得到一種材料環(huán)保而且各項力學(xué)性能優(yōu)越的新型高性能混凝土材料,具有很高的研究意義和應(yīng)用前景。本文以普通混凝土為基體,以鋼纖維摻量(0.5%,0.75%,1.0%)和橡膠體積取代率(5%,10%,15%)為變量進行改性。通過基本力學(xué)性能試驗、掃描電鏡試驗和三點彎斷裂試驗,重點研究了鋼纖維改性橡膠混凝土的基本力學(xué)性能、斷裂性能。本文主要進行了如下研究工作:(1)設(shè)計并制作30組共90個100mm×100mm×100mm標(biāo)準(zhǔn)立方體試塊和18組共54個100mm×100mm×400mm棱柱體試塊,進行了鋼纖維混凝土的立方體抗壓、劈裂抗拉和抗折試驗,研究了鋼纖維混凝土與鋼纖維摻量和齡期的變化規(guī)律,以掌握本實驗選用的鋼纖維摻加對混凝土力學(xué)性能的影響;(2)設(shè)計并制作16組共48個150mm×150mm×150mm標(biāo)準(zhǔn)立方體試塊和8組共24個100mm×100mm×400mm棱柱體試塊和5組共30個?150mm×300mm的圓柱體試件,進行了鋼纖維改性橡膠混凝土的基本力學(xué)性能試驗和掃描電鏡試驗,研究了鋼纖維摻量和橡膠摻量對鋼纖維改性橡膠混凝土基本力學(xué)性能的影響,結(jié)合橡膠顆粒、鋼纖維與混凝土基體的界面過渡區(qū)(ITZ)微觀結(jié)構(gòu)對鋼纖維改性橡膠混凝土宏觀力學(xué)性能作出了微觀解釋;(3)設(shè)計并制作9組共27個100mm×100mm×400mm帶預(yù)制裂縫的切口梁,進行了鋼纖維改性橡膠混凝土的斷裂性能試驗,分別測取了三點彎曲切口梁加載點的荷載-位移(P-δ)曲線和荷載-縫端開口位移(P-CMOD)曲線,計算了鋼纖維改性橡膠混凝土的雙K斷裂參數(shù)。通過對比試驗研究了鋼纖維摻量和橡膠摻量對鋼纖維改性橡膠混凝土斷裂性能的影響,得到了雙K斷裂參數(shù)與齡期發(fā)展關(guān)系的公式。
[Abstract]:In this paper, a new kind of environmental protection and high performance composite concrete, steel fiber modified rubber concrete, is studied. Adding rubber particles made from crushed waste tires into concrete reduces the environmental pollution caused by rubber tires and can improve the fracture toughness, impact resistance and fatigue performance of concrete, but it is still unable to get rid of the shortcomings of low tensile and flexural strength of concrete. Adding steel fiber can give play to its characteristics of strengthening and toughening, tensile and bending resistance and so on, and solves the problem that the basic mechanical properties of concrete due to the addition of rubber can be reduced, and both of them can play a synergistic effect. Therefore, a new type of high performance concrete material with environmental protection and superior mechanical properties is obtained, which has high research significance and application prospect. In this paper, the ordinary concrete is used as the matrix, the steel fiber content is 0.5 and 0.750.75 and the rubber volume replacement ratio is 5 ~ 10 ~ 15 ~ 15). The basic mechanical properties and fracture properties of steel fiber modified rubber concrete were studied by means of basic mechanical property test, scanning electron microscope test and three point bending fracture test. In this paper, 30 groups of 90 100mm 脳 100mm 脳 100mm standard cubes and 18 groups of 54 100mm 脳 100mm 脳 400mm prisms were designed and fabricated. The cube compression, splitting tensile and flexural tests of steel fiber reinforced concrete (SFRC) were carried out. The variation law of steel fiber concrete and steel fiber content and age is studied. In order to master the influence of steel fiber admixture on the mechanical properties of concrete in this experiment, 16 groups of 48 150mm 脳 150mm 脳 150mm standard cube specimens, 8 groups of 24 100mm 脳 100mm 脳 400mm prisms and 5 groups of 30 150 mm 脳 300mm cylindrical specimens were designed and fabricated. The basic mechanical properties of steel fiber modified rubber concrete (SFRC) and scanning electron microscope (SEM) tests were carried out. The effects of steel fiber content and rubber content on the basic mechanical properties of steel fiber modified rubber concrete were studied. The microstructure of steel fiber and concrete matrix interfacial transition zone (ITZ) was used to microexplain the macroscopic mechanical properties of steel fiber modified rubber concrete. Nine groups of notched beams with 27 100mm 脳 100mm 脳 400mm cracks were designed and fabricated. The fracture behavior tests of steel fiber modified rubber concrete were carried out. The load-displacement P- 未 curves and P-CMOD curves of loading point of three-point bending notch beam were measured, respectively. The double K fracture parameters of steel fiber modified rubber concrete were calculated. The effects of steel fiber content and rubber content on the fracture properties of steel fiber modified rubber concrete were studied by contrast tests. The relationship between double K fracture parameters and age development was obtained.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前10條

1 李厚民;張巖;王儀政;舒展;;鋼纖維改性橡膠混凝土力學(xué)性能研究[J];建筑科學(xué);2015年11期

2 徐世p，

本文編號：2000295