Experimental study on the relationship between acoustic emission energy and fracture energy of crumb rubber concrete

2018 ◽  
Vol 25 (10) ◽  
pp. e2240 ◽  
Author(s):  
Qing-Hua Han ◽  
Guang Yang ◽  
Jie Xu
Keyword(s):  
Experimental Study ◽  
Acoustic Emission ◽  
Fracture Energy ◽  
Crumb Rubber ◽  
Acoustic Emission Energy ◽  
Emission Energy ◽  
Crumb Rubber Concrete ◽  
The Relationship ◽  
Rubber Concrete

Experimental Study on Ratio of Bending-Compressive Strength of the Crumb Rubber Concrete Modified by Latex

2014 ◽  
Vol 941-944 ◽  
pp. 761-764
Author(s):  
Wei Li ◽  
Zhen Huang ◽  
Xiao Chu Wang ◽  
Zi Sheng Zang
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Compressive Strength ◽  
Surface Modification ◽  
Flexural Strength ◽  
Crumb Rubber ◽  
Interface Effect ◽  
Rubber Particles ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

The cementitiousness between rubber particles and cement-based material could be raised because of the surface modification of rubber,thus enhance the mechanical property of crumb rubber concrete and improve the interface effect of rubber particles.We had researched the change regulation about the ratio of bending-compressive strength of the crumb rubber concrete modified by latex,the concrete with various quantity of rubber,under the condition dosage of latex is 0.5% of cement quality.The result of experimental prove that,compressive strength, splitting tensile and flexural strength could be enhanced because of latex injecting,and the ratio of bending-compressive strength could be enhanced at the same time.

Experimental Study on Proportion of Tensile Strength and Compressive Strength of the Crumb Rubber Concrete Modified by Latex

2014 ◽  
Vol 919-921 ◽  
pp. 1916-1919
Author(s):  
Wei Li ◽  
Zhen Huang ◽  
Xiao Chu Wang ◽  
Zi Sheng Zang
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Surface Modification ◽  
Flexural Strength ◽  
Crumb Rubber ◽  
Rubber Particles ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

The cementitiousness between rubber particles and cement-based material could be raised because of the surface modification of rubber,thus enhance the mechanical property of crumb rubber concrete and improve the interface effect of rubber particles.We had researched the change regulation of the ratio between tensile strength and compressive strength of the Crumb Rubber Concrete Modified by latex,the concrete with various quantity of rubber,under the condition Dosage of latex is 0.5% of cement quality.The result of Experimental prove that,compressive strength, splitting tensile and flexural strength could be enhanced because of latex injecting,and the ratio between tensile strength and compressive strength could be enhanced at the same time.

Shake-table tests on frame built in crumb rubber concrete

2020 ◽  
Vol 23 (10) ◽  
pp. 2003-2017
Author(s):  
Hanif Ullah ◽  
Naveed Ahmad ◽  
Muhammad Rizwan
Keyword(s):  
Experimental Study ◽  
Seismic Response ◽  
Crumb Rubber ◽  
Shake Table ◽  
Reinforced Concrete Frame ◽  
Shake Table Tests ◽  
Concrete Frame ◽  
Time Period ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

This article presents experimental study performed on a first-of-its-kind frame fabricated using crumb rubber concrete, that is, concrete with waste rubbers (crumb) as a partial replacement of fine aggregate (sand). A 20% volume of sand was replaced by rubber crumb. Free vibration and shake-table tests were performed on 1:3 reduced scale frame models, both conventional reinforced concrete frame and crumb rubber concrete frame. The dynamic properties (i.e. frequency/time period, elastic viscous damping, and floor acceleration amplification) and seismic response parameters (i.e. ductility and response modification factors) were obtained. In addition, lateral displacement demand was correlated with peak base acceleration to derive seismic response curves. The seismic performance of crumb rubber concrete frame was compared with the conventional reinforced concrete frame in order to assess the feasibility of rubberized concrete for building constructions in areas of active seismicity. The following were concluded on the basis of experimental study: the elastic damping reduced by 12%, the initial time period increased by 6%, specific weight of concrete reduced by 6%, maximum lateral load reduced by 20%, lateral maximum story drift capacity increased by 30%, displacement ductility ratio increased by 2%, response modification factor reduced by 24%, maximum peak base acceleration resistance corresponding the incipient collapse state increased by 40%.

scholarly journals Energy Evolution Behavior and Mesodamage Mechanism of Crumb Rubber Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Shengtong Di ◽  
Chao Jia ◽  
Weiguo Qiao ◽  
Kang Li ◽  
Kai Tong
Keyword(s):  
Energy Release ◽  
Damage Threshold ◽  
Crumb Rubber ◽  
Mechanical Parameters ◽  
Energy Evolution ◽  
Dissipation Energy ◽  
Crumb Rubber Concrete ◽  
Release Ratio ◽  
The Relationship ◽  
Rubber Concrete

The energy evolution behaviour and mesodamage mechanism of CRC (crumb rubber concrete) were investigated by laboratory experiments and numerical simulations. The mesoscopic physical and mechanical parameters of CRC (crumb rubber concrete) materials were analyzed and determined by the discrete element method and trial-and-error method, and the mechanism and evolution of microcracks propagation during CRC failure were studied based on the parallel-bond model. The relationship among dissipation energy, damage threshold, and rubber content during CRC damage was studied by adopting the method of microscopic energy tracking. The energy release ratio was proposed to analyze the degree of “brittleness” of CRC after reaching its peak strength. The essential mechanism of different failure characteristics of CRC and NC (normal concrete) was analyzed and discussed by referring to their correlation between the microenergy evolution rule and the constitutive curve. The results show that (1) the calibrated mesoscopic physical and mechanical parameters can better reflect the mechanical characteristics of CRC materials, (2) there is a strong correlation between the mesoscopic damage threshold of CRC with different rubber contents and the proportion of dissipation energy at the peak strength, and the damage threshold of the CRC with 25% rubber mass is the largest, (3) the relationship between elastic strain energy release ratio of CRC and rubber particle contents can be fitted by the negative exponential function, and (4) the essential reasons for the different destruction characteristics of CRC and NC is that the addition of rubber particles makes more external input energy to be converted into dissipative energy required for microcracks propagation and sliding friction between particles and released step by step.

Micro-cracking monitoring and fracture evaluation for crumb rubber concrete based on acoustic emission techniques

2017 ◽  
Vol 17 (4) ◽  
pp. 946-958 ◽  
Author(s):  
Jie Xu ◽  
Zhengwu Fu ◽  
Qinghua Han ◽  
Giuseppe Lacidogna ◽  
Alberto Carpinteri
Keyword(s):  
Acoustic Emission ◽  
Evaluation Method ◽  
Early Stage ◽  
Damping Ratio ◽  
Crumb Rubber ◽  
Acoustic Emission Technique ◽  
Statistical Parameters ◽  
Micro Cracks ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

A micro-cracking monitoring and fracture evaluation method for crumb rubber concrete based on the acoustic emission technique was developed. The precursory micro-cracking activity and fracture behavior of crumb rubber concrete with different rubber contents, 0%, 10%, and 15%, were analyzed. The various acoustic emission statistical parameters including cumulative event, frequency distribution, amplitude distribution, and b-value were used for the analysis. The general fracture process is similar for all normal and crumb rubber concretes and can be divided into three distinct stages of micro-crack activity, namely, early stage, main collapse stage, and post-fracture stage. The following conclusions were drawn from the analysis: (1) more micro-cracks initiated and grew at early stage in the normal concrete, while less micro-cracks in the crumb rubber concrete but with longer stage duration; (2) the duration and crack number are both increasing with the increase in the rubber contents in main collapse and post-fracture stages; (3) new crack types associated with the rubber particles were recorded due to the change of the peak frequencies; and (4) the amplitude of the cracks decrease with the increase in the rubber content due to the damping ratio and interface improvement by the mixed rubbers. The results obtained in this article demonstrate that the acoustic emission technique can provide valuable information for a better understanding of micro-cracking and fracture monitoring of crumb rubber concrete.

Experimental Study on the Mechanical Properties of the Crumb Rubber Concrete Modified by Silica Fume

2014 ◽  
Vol 543-547 ◽  
pp. 4031-4034 ◽  
Author(s):  
Wei Li ◽  
Zhen Huang ◽  
Xiao Chu Wang ◽  
Zi Sheng Zang
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Silica Fume ◽  
Mechanism Of Action ◽  
Crumb Rubber ◽  
Experimental Result ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete ◽  
The Way

For researching the way of modified and mechanism of action of the Crumb Rubber Concrete,we had researched the change regulation of Mechanical Properties and compressive strengthsplitting tensile strengthflexural strength of the Crumb Rubber Concrete Modified By Silica Fume with various quantity of rubber,in the condition of 10% silica fume.the experimental result make it clear that silica fume is propitious to heighten compressive strengthsplitting tensile strengthflexural strength of the Crumb Rubber Concrete,and compressive strengthsplitting tensile strengthflexural strength would be cut down when mix the Crumb rubber in Concrete.

In-Process Tool Fracture Detection

1984 ◽  
Vol 106 (2) ◽  
pp. 111-118 ◽  
Author(s):  
M. S. Lan ◽  
D. A. Dornfeld
Keyword(s):  
Acoustic Emission ◽  
Fracture Surface ◽  
Signal Analysis ◽  
Cutting Tool ◽  
Fracture Detection ◽  
Acoustic Emission Energy ◽  
Emission Energy ◽  
Ae Signal ◽  
The Relationship ◽  
Carbide Insert

This paper investigates the feasibility of using acoustic emission (AE) signal analysis for the detection of the breakage as well as the chipping of a cutting tool during machining. Experiments were conducted on a lathe using conventional carbide insert tools under realistic cutting conditions. The tangential and feed forces were also measured for comparisons. The sensitivities of the AE signal and cutting forces to insert chipping and fracture are illustrated. The relationship between acoustic emission energy and the combined effect of fracture surface area and cutting load is discussed.

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