钢纤维改性橡胶混凝土断裂性能试验研究

发布时间：2018-06-09 15:54

本文选题：钢纤维 + 橡胶颗粒　；参考：《浙江工业大学》2016年硕士论文

【摘要】：本文研究了一种新型环保高性能复合混凝土材料——钢纤维改性橡胶混凝土。将废旧轮胎粉碎后制成的橡胶颗粒掺入到混凝土中减轻了橡胶轮胎对环境的污染还能改善混凝土断裂韧性、抗冲击性、疲劳性能,但仍无法摆脱混凝土抗拉抗折强度低的缺点。掺入钢纤维可以发挥其增强增韧、抗拉抗折等特点,解决了掺入橡胶导致混凝土基本力学性能下降的问题,两者能够发挥协同效应,从而得到一种材料环保而且各项力学性能优越的新型高性能混凝土材料,具有很高的研究意义和应用前景。本文以普通混凝土为基体,以钢纤维掺量(0.5%,0.75%,1.0%)和橡胶体积取代率(5%,10%,15%)为变量进行改性。通过基本力学性能试验、扫描电镜试验和三点弯断裂试验,重点研究了钢纤维改性橡胶混凝土的基本力学性能、断裂性能。本文主要进行了如下研究工作:(1)设计并制作30组共90个100mm×100mm×100mm标准立方体试块和18组共54个100mm×100mm×400mm棱柱体试块,进行了钢纤维混凝土的立方体抗压、劈裂抗拉和抗折试验,研究了钢纤维混凝土与钢纤维掺量和龄期的变化规律,以掌握本实验选用的钢纤维掺加对混凝土力学性能的影响;(2)设计并制作16组共48个150mm×150mm×150mm标准立方体试块和8组共24个100mm×100mm×400mm棱柱体试块和5组共30个?150mm×300mm的圆柱体试件,进行了钢纤维改性橡胶混凝土的基本力学性能试验和扫描电镜试验,研究了钢纤维掺量和橡胶掺量对钢纤维改性橡胶混凝土基本力学性能的影响,结合橡胶颗粒、钢纤维与混凝土基体的界面过渡区(ITZ)微观结构对钢纤维改性橡胶混凝土宏观力学性能作出了微观解释;(3)设计并制作9组共27个100mm×100mm×400mm带预制裂缝的切口梁,进行了钢纤维改性橡胶混凝土的断裂性能试验,分别测取了三点弯曲切口梁加载点的荷载-位移(P-δ)曲线和荷载-缝端开口位移(P-CMOD)曲线,计算了钢纤维改性橡胶混凝土的双K断裂参数。通过对比试验研究了钢纤维掺量和橡胶掺量对钢纤维改性橡胶混凝土断裂性能的影响,得到了双K断裂参数与龄期发展关系的公式。
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528

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