Study on Crack Bridging Ability of Polymer-Modified Cement Based Compounds for Waterproofing Material

2015 ◽  
Vol 1129 ◽  
pp. 217-221 ◽  
Author(s):  
Hong Zhao ◽  
Wei Li ◽  
Yong Ming Zhang
Keyword(s):  
Tensile Strength ◽  
Strength Test ◽  
Test Method ◽  
Test Results ◽  
Engineering Applications ◽  
Crack Bridging ◽  
Ability Test ◽  
Elongation At Break ◽  
Tensile Strength Test ◽  
Good Ability

China's existing polymer-modified cement based compounds for waterproofing material standards are used for the tensile strength test and elongation at break test as the test method to evaluate the performance of the product extension. The elongation only reflects the extension ability of product, but cannot indicate the crack bridging ability of the product. In engineering applications, there is a requirement for higher bridging cracks ability of the products. In this paper, 9 samples of polymer-modified cement based compounds for waterproofing material were tested. Crack bridging ability was tested under the standards and methods in DIN EN 14891:2013-07. Tensile strength and elongation at break were tested according to the standards and methods in GB23445:2009. The crack bridging ability test results are between 0 to 2.08mm, in which 5 of them meet the requirements of greater than 0.75mm according to DIN EN14891:2013-07.The tensile strength test results are between 1.13MPa to 3.19MPa, the elongation at break test results are between 4% to 350%.The results show that higher tensile strength and higher elongation at break will have good ability of crack bridging. Samples with better crack bridging ability are close to type III product according to GB23445-2009 which requires tensile strength ≥ 1.8MPa and elongation at break ≥ 30%. Crack bridging ability directly reflects the product’s ability of crack bridging, and is more in line with the actual requirements in engineering applications. It is recommended that the crack bridging ability test method should be adopted in the formulation of China polymer-modified cement compounds for waterproofing material standards.

scholarly journals Superficial morphology and mechanical properties of in vivo aged orthodontic ligatures

2013 ◽  
Vol 18 (3) ◽  
pp. 107-112 ◽  
Author(s):  
Glaucio Serra Guimarães ◽  
Liliane Siqueira de Morais ◽  
Margareth Maria Gomes de Souza ◽  
Carlos Nelson Elias
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Strength Test ◽  
Test Method ◽  
Test Results ◽  
Tensile Strength Test ◽  
Oral Environment ◽  
Scanning Electron

INTRODUCTION: The degradation of elastic ligatures in the oral environment results in the need of periodic replacement to maintain the optimal force during the orthodontic treatment. The purpose of this study was to perform a clinical prospective randomized study of the degradation of orthodontic elastomeric ligatures in the oral environment by scanning electron microscopy (SEM) and tensile strength test. METHOD: Two hundred elastic ligatures were randomly selected and placed around the brackets of 5 volunteers and removed in groups of 10, at different times (1, 2, 3, and 4 weeks). The control group was performed by another fifty ligatures which were not submitted to the oral degradation. The analyses were done by scanning electron microscopy (SEM) and strength mechanical test. RESULTS: The tensile strength test results showed reduction in the ultimate strength values after four weeks ageing in the oral environment and no statistical difference in the yield strength values (p < 0.05). The orthodontic elastomeric ligatures surface was significantly degraded in the oral cavity after four weeks. The elastomeric degradation began in the first week when the increase in the roughness could be detected just in some areas. Afterwards, the surface became gradually rougher and, after 4 weeks, it was totally rough with some crack areas. CONCLUSIONS: The elastic ligatures aged in the oral environment showed higher superficial degradation and lower loss of mechanical properties after the maximum experimental period.

scholarly journals An Innovative Test Method for Tensile Strength of Concrete by Applying the Strut-and-Tie Methodology

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2776 ◽  
Author(s):  
Wen-Cheng Liao ◽  
Po-Shao Chen ◽  
Chung-Wen Hung ◽  
Suyash Kishor Wagh
Keyword(s):  
Tensile Strength ◽  
Test Methods ◽  
Standard Test ◽  
Strength Test ◽  
Tension Test ◽  
Test Method ◽  
Direct Tension ◽  
Direct Tension Test ◽  
Strut And Tie ◽  
Tensile Strength Test

Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications; the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength. By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete.

scholarly journals Experimental Study of Brazilian Tensile Strength of Concrete Under Static Loads

2020 ◽  
Vol 206 ◽  
pp. 01018
Author(s):  
Rui Li ◽  
Lei Liu ◽  
Zhihua Zhang ◽  
Huaming An
Keyword(s):  
Tensile Strength ◽  
Testing Machine ◽  
Damage Index ◽  
Modern Society ◽  
Strength Test ◽  
Test Method ◽  
Tensile Failure ◽  
Brazilian Tensile Strength ◽  
Failure Patterns ◽  
Tensile Strength Test

Concrete is one of the most significant materials in modern society. It is widely used in many projects. Thus it is essential to study the strength and the failure patterns of this material. As well known, the compressive strength is much higher than the tensile strength for concrete. Thus, it is easy to fail due to the tensile strength for concrete. Thus, this paper focuses on the study of the tensile strength of the concrete and its failure patterns. Three types of concretes are made for studying the tensile strengths and the failure patterns of the concretes. Then the Brazilian tensile strength test method is employed in this study. The mythology of calculating tensile strength by the Brazilian tensile strength test method is introduced. Many discs are made for the tests. The Rock mechanics testing machine is used to excavate pressure on the top and bottom of the disc. It is concluded that the failure of the disc is along the vertical diameter between the top and bottom plates contacting the dis. The tensile failure is not obviously influenced by the ratios of the materials while the tensile strength is significantly influenced by the ratios of the concrete. The damage index of concrete is also proposed to describe the capabilities of resisting failure.

scholarly journals Evaluating Marination Effect of Diluted Zycothermon Hot Mix Asphalt

2017 ◽  
Vol 3 (3) ◽  
pp. 18
Author(s):  
Ilham I. Mohammed
Keyword(s):  
Tensile Strength ◽  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Strength Test ◽  
Stability Test ◽  
Test Results ◽  
Great Range ◽  
Tensile Strength Test ◽  
Moisture Conditions

Sinceasphalt concrete undergo different failure problems at different temperature and moisture conditions and for years many scientists and researchers used different kinds of materials and variety of methods for improving the properties of asphalt concrete made with either basalt or limestone.So it became necessary to provide the best possible way to get rid of these failure problems.In this study diluted zycotherm nanomaterial at three different percentages by weight of aggregate used with two aggregate types, basalt and limestone, and asphalt concrete made with the marinated aggregate and later the properties of asphalt concrete were investigated after the marination.Indirect tensile strength test and retained stability test results were used to evaluate the marinating effect.As a result zycotherm dilution by weight of aggregate has changed the properties of asphalt mixture and improved to a great extent. From the results it can be concluded that rutting and fatigue problems decreased with a great range.

The Broken Analysis of 220kV Transmission Line Tension Crimp Barrel Steel Core

2014 ◽  
Vol 926-930 ◽  
pp. 950-953
Author(s):  
Guo Dong Han ◽  
Shu Ting Wan ◽  
Zhang Qin Wu ◽  
Zhan Jie Lv ◽  
Rong Hai Liu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Transmission Line ◽  
Visual Inspection ◽  
Line Tension ◽  
Strength Test ◽  
Accident Analysis ◽  
Test Results ◽  
Size Measurement ◽  
Tensile Strength Test ◽  
Steel Core

Through the visual inspection, the appearance of size measurement, crimping size measurement, the steel core crimping length measurement and steel core tensile strength test of tension crimp barrel on 220kV transmission line. Made a detail analysis on test results combined with wire crimping theory. Pointed out the wire crimping defects caused by crimping irregularities. Analyzed the main causes of rupture accident, and made recommendations for improvement. Provides a reference to wire crimp and wire accident analysis.

scholarly journals SNI - 2491-2014

2019 ◽  
Author(s):  
Subandi
Keyword(s):  
Tensile Strength ◽  
Building Materials ◽  
Materials Science ◽  
Construction Materials ◽  
Standard Test ◽  
Technical Committee ◽  
Strength Test ◽  
Test Method ◽  
National Standard ◽  
Tensile Strength Test

This is the standard method of tensile strength test for split concrete cylindrical specimens issued by the Indonesian National Standard Board (SNI) of the Indonesian National Standard (SNI) on "The tensile strength test method of cylindrical concrete specimens" is a revision of SNI 03-2491-2002, Testing methods the tensile strength of concrete. This standard is the result of identical adoption of ASTM C496 / C496M-04, Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens. This standard was prepared by the 91-01 Technical Committee on Building Construction Materials and Civil Engineering through the Building Materials Working Group on the 91-01-S4 Technical Sub-Committee on Building Materials, Science and Construction. The writing procedures are compiled following the BSN Guideline Number 8 of 2007 and have been discussed in a consensus meeting on June 3, 2013, in Bandung, by a Technical Sub-Committee involving speakers, experts, and related institutions.

scholarly journals Tensile Strength of Bamboo After Preservation

2020 ◽  
Vol 3 ◽  
pp. 153-155
Author(s):  
Noverma ◽  
Oktavi Elok Hapsari ◽  
Yusrianti
Keyword(s):  
Tensile Strength ◽  
Research Method ◽  
Test Sample ◽  
Strength Test ◽  
Test Results ◽  
High Tensile Strength ◽  
Time Duration ◽  
Tensile Strength Test ◽  
Weather Changes ◽  
X 24

Bamboo has high tensile strength, so it can be an alternative to substitute wood or steel. Bamboo is a material that comes from nature, so it is vulnerable to degraded by weather changes and infected by termites and fungi. The effort to overcome this problem is by preserving before using it. This study aims to determine the tensile strength test results of bamboo after preserving and then compare with the tensile strength test results of bamboo without preserving. The research method was carried out by preserving bamboo by soaking the test sample in a container filled with water for a duration of time; 1 x 24 hours; 3 x 24 hours and 14 x 24 hours. The water used in freshwater with a salinity of 0 0/00 measured using a salinometer. The results showed that the tensile strength of bamboo increased compared without preserved with a percentage of 12.50%; 23.12% and 10.59% for the duration of time respectively 1x24 hours; 3x24 hours and 14x24 hours. Optimal tensile strength is obtained at a time duration of 3 x 24 hours and decreases at a longer time duration of 14x24 hours.

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