SP-155: Testing of Fiber Reinforced Concrete最新文献

Deflection Measurement Considerations in Evaluating FRC Performance Using ASTM C 1018 使用ASTM C 1018评估FRC性能的挠度测量考虑

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/926

C. Johnston

{"title":"Deflection Measurement Considerations in Evaluating FRC Performance Using ASTM C 1018","authors":"C. Johnston","doi":"10.14359/926","DOIUrl":"https://doi.org/10.14359/926","url":null,"abstract":"The issue of how the method of determining midspan deflection in American Society for Testing and Materials (ASTM) C1018 toughness tests influences first-crack strength, first-crack deflection, toughness indices, and residual strength factors is addressed by comparing results obtained using the method now required in the current standard. The standard is based on net midspan deflection determined as the nominal midspan deflection minus the average of the deflections measured at the beam supports, with corresponding same-specimen results based on nominal midspan deflection only which was not explicitly excluded in earlier versions of the standard. The problem of dealing with the portion of load-deflection relationship immediately after first crack when it is unstable is also discussed. The range of test specimens for which comparative data are reported includes a series of third-point-loaded beams with three different steel fibers of varying lengths, a second smaller series of beams that allows for assessment of the effects of beam size and fiber alignment, and a series of beams with a single type of fibrillated polypropylene fiber. Fiber contents are varied as well. The results demonstrate the extent to which the C1018 parameters are effective in distinguishing the performance of the various fiber reinforced concrete mixtures in terms of fiber type, geometry, and amount.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121303288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Test Methods for Durability of Polymeric Fibers in Concrete and UV Light Exposure 混凝土中聚合纤维耐久性和紫外线曝晒试验方法

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/931

P. Balaguru, K. Slattum

{"title":"Test Methods for Durability of Polymeric Fibers in Concrete and UV Light Exposure","authors":"P. Balaguru, K. Slattum","doi":"10.14359/931","DOIUrl":"https://doi.org/10.14359/931","url":null,"abstract":"Two test methods are presented that can be used for evaluating durability of polymeric fibers subjected to alkaline environment present in concrete and to ultraviolet (UV) light exposure. The test methods were used to evaluate three polymeric fibers: nylon, polypropylene, and polyester. Durability of the fibers in an alkaline environment was ascertained by measuring the flexural toughness of fiber reinforced concrete specimens that had been aged in lime saturated water maintained at 50 deg C. The UV light exposure test was conducted at a temperature of 65 deg C with intermittent water spray. The wet spray was used to simulate conditions in the field. Durability of the fibers was determined by measuring the retained tensile strength of the fibers after light exposure and by observing the surface characteristics of fibers under a microscope. The test results indicate that nylon and polypropylene fibers are durable in alkaline environment present in concrete. The nylon fibers, which were light stabilized, were determined to be stable under UV light exposure. Polypropylene fibers deteriorated under UV light, and the deterioration of the polypropylene single filament fibers was more rapid than for the fibrillated fibers. Hence these fibers should not be used in applications where the fiber contribution is needed at cracked-exposed sections.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131129943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Toughness of fiber-Reinforced High-Strength Concrete from Notched Beam Tests 缺口梁试验中纤维增强高强混凝土的韧性

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/927

D. Jamet, R. Gettu, V. Gopalaratnam, A. Aguado

{"title":"Toughness of fiber-Reinforced High-Strength Concrete from Notched Beam Tests","authors":"D. Jamet, R. Gettu, V. Gopalaratnam, A. Aguado","doi":"10.14359/927","DOIUrl":"https://doi.org/10.14359/927","url":null,"abstract":"The toughness of fiber-reinforced concretes (FRC) is characterized from notched beam tests. The tests are conducted under crack-mouth opening displacement (CMOD) control in a servo-hydraulic machine to determine the stable response of both the unreinforced concrete and the FRC. Several toughness measures are defined in terms of the experimentally obtained load versus CMOD curves. These measures give a better indication of the fundamental behavior of the concrete, avoid the problems associated with the approach based on the deflection of unnotched beams, and are amenable to the incorporation of serviceability considerations. The effect of specimen size on the toughness is found to be significant in both the matrix- and fiber-dominated regimes of the FRC behavior. In general, toughness increases with specimen size and needs to be considered for characterization. The study was performed on beams of a 70 MPa compressive strength silica fume concrete, with and without high-strength hooked steel fibers. Findings indicate that the incorporation of a low volume fraction (1 percent) of steel fibers is sufficient to significantly decrease the brittleness of high strength concretes.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127412208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Impact Tests on Cement-Based Fiber Reinforced Composites 水泥基纤维增强复合材料的冲击试验

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/934

N. Banthia, K. Chokri, J. Trottier

引用次数: 13

Direct Tensile Strength Testing at 6 Hours of Fiber Reinforced Concrete Mortar Fractions 纤维增强混凝土砂浆馏分6小时直接拉伸强度试验

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/933

P. P. Kraai, G. Vondran

{"title":"Direct Tensile Strength Testing at 6 Hours of Fiber Reinforced Concrete Mortar Fractions","authors":"P. P. Kraai, G. Vondran","doi":"10.14359/933","DOIUrl":"https://doi.org/10.14359/933","url":null,"abstract":"The prime consideration in minimizing concrete cracks in the field is to maximize the early (6-hour) tensile strength development to resist the volume reduction due to rapid water loss. This paper describes a test method, which simulates field conditions, for measuring direct tensile strength soon after initial set at 6 hours. The prototype direct tensile test described presents an effort to quantify results as a measure of crack resistance. In this investigation, three different types of concrete mortar fractions were evaluated: plain, polypropylene fiber mixed in the batch, and the same fiber but roughened by intergrinding with cement for better mechanical bond. Results of tensile testing indicate that the process of intergrinding fibers with cement improves the tensile strength of similar mortar reinforced with smooth fibers by 63 percent. Comparing the ground fiber results to a plain (no fiber) mortar mixture shows almost three times higher direct tensile strength. Based on this exploratory work on early tensile strength testing, it appears to be a viable method to arrive at quantifiable values, which will lead to a better understanding of the concrete cracking phenomenon and its control.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134285029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparative Toughness Testing of Fiber Reinforced Concrete 纤维增强混凝土的比较韧性试验

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/928

Longyang Chen, S. Mindess, D. Morgan, Surendra P. Shah, C. Johnston, M. Pigeon

{"title":"Comparative Toughness Testing of Fiber Reinforced Concrete","authors":"Longyang Chen, S. Mindess, D. Morgan, Surendra P. Shah, C. Johnston, M. Pigeon","doi":"10.14359/928","DOIUrl":"https://doi.org/10.14359/928","url":null,"abstract":"Round-robin tests of the flexural toughness of fiber reinforced concrete were conducted using six different testing machines in five different laboratories. Six groups of beams, including a plain concrete control, two different volumes of polypropylene fibers, and three different volumes of steel fibers were tested in accordance with American Society for Testing and Materials (ASTM) C1018, with special care taken to exclude the \"extraneous\" deflections due to deformations at the specimen supports. The results from laboratory tests were used to compute the ASTM C1018 toughness indices and the corresponding residual strength factors. Also, the Japan Society of Civil Engineers (JSCE) Toughness and Toughness Factor were calculated. The findings suggest that although the load versus deflection curves were naturally quite variable, in most cases there was no significant difference amongst the participating laboratories, except for those mixes with a very low toughness. In addition, ASTM C1018 toughness indices did not discriminate very well amongst the different fiber contents or different fiber types; the JSCE parameters were more successful in this regard.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125170415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Measuring Toughness Characteristics of SFRC--a Critical View of ASTM C 1018 测量SFRC的韧性特性——ASTM C 1018的批判观点

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/929

D. Nemegeer, P. Tatnall

引用次数: 4

Experimental R-Curves for Assessment of Toughening in Fiber Reinforced Cementitious Composites 评价纤维增强胶凝复合材料增韧性能的实验r曲线

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/930

B. Mobasher, C. Li, A. Ariño

{"title":"Experimental R-Curves for Assessment of Toughening in Fiber Reinforced Cementitious Composites","authors":"B. Mobasher, C. Li, A. Ariño","doi":"10.14359/930","DOIUrl":"https://doi.org/10.14359/930","url":null,"abstract":"Procedures to obtain the experimental R-Curves using a compliance calibration technique are examined. R-Curves provide a convenient means to study the process of fracture and the brittle-ductile transition in materials. Single edge notched beam specimens are tested under closed loop rack mouth opening control. The procedure to obtain the R-Curves using loading/unloading compliance and the residual displacements are discussed. An elastically equivalent toughness K(superscript)R as a function of crack extension is defined to compare the R-Curves with the available data in the literature. The developed test method is applied to fiber reinforced concrete (FRC) composites with up to 8 percent by volume of short, chopped alumina, carbon, and polypropylene (PP) fibers. Significant strengthening of the matrix due to the addition of short carbon and alumina fibers are observed. R-Curves in these composites are characterized by an increase in the steady state fracture toughness. In PP-FRC composites, energy dissipation due to fiber pullout increases the ascending rate of the R-Curve well after the main crack has formed. The work of fracture is calculated from the cyclic loading/unloading tests and the results are compared with the R-Curves.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125084870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Testing Applied to the Evaluation of Damage to FRC and Other Material Systems Caused by Large Missile Impact to Building Envelopes During Storm Events 应用于评估风暴事件中大型导弹撞击建筑围护结构对FRC和其他材料系统损伤的试验

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/936

C. Hays, R. Zollo

{"title":"Testing Applied to the Evaluation of Damage to FRC and Other Material Systems Caused by Large Missile Impact to Building Envelopes During Storm Events","authors":"C. Hays, R. Zollo","doi":"10.14359/936","DOIUrl":"https://doi.org/10.14359/936","url":null,"abstract":"Recent natural disasters involving high wind events have demonstrated the fact that building envelopes, including structural walls and roofs, can lose structural integrity as a result of penetration by missile objects. Consequently, there is heightened interest in the testing of components and cladding that are used as a part of building envelopes of habitable structures. A large missile impact test has been designed and is being evaluated in laboratories around the country. The test discussed in this paper is suitable for laboratory or field applications and is currently undergoing scrutiny by the American Society for Testing and Materials (ASTM) Task Force of Committee E6, Performance of Buildings. Adoption of the test by the South Florida Building Code came in the wake of Hurricane Andrew in 1992. The test has been applied to numerous types of wall systems and building products including a fiber reinforced cellular concrete panel which is designed to be used as an alternate to masonry infill construction, architectural precast, demising walls, and security fencing. Additional tests of the missile impact resistance of fiber reinforced cellular concrete involving the use of large caliber ballistics are also discussed. The high energy impact resistance of fiber reinforced systems is demonstrated and discussed.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134271317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Restrained Shrinkage Tests on Fiber Reinforced Cementitious Composites 纤维增强胶凝复合材料的约束收缩试验

SP-155: Testing of Fiber Reinforced Concrete Pub Date : 1995-08-01 DOI: 10.14359/932

N. Banthia, M. Azzabi, M. Pigeon

引用次数: 13