{"title":"Fiber Reinforced Concrete Testing for Practical Application","authors":"G. Spadea, R. Cava, D. Gallo, R. N. Swamy","doi":"10.14359/937","DOIUrl":"https://doi.org/10.14359/937","url":null,"abstract":"One of the possible factors inhibiting the wider application of fiber concretes is the fact that to characterize the engineering properties of fiber concrete, both cubes/cylinders and prisms have to be cast and tested, in addition to the determination of workability. This paper demonstrates that by using superplasticizer, the slump test can be used to give guidance on the flowability characteristics of the fresh fiber concrete. The advantage of the slump test is that it is easy to perform in the field, apart from its simplicity and convenience. It is further shown that the equivalent cube strength obtained from the broken pieces of a flexural test can adequately represent the compressive strength of fiber concretes. It is thus shown that it is possible to characterize the engineering properties of fiber concretes from only one set of prisms, say, of 100x100x500 mm size. Apart from first crack load, modulus of rupture, and fracture toughness properties, the prisms can be employed to give additional information as appropriate, such as shrinkage and expansion, and through pulse velocity, internal microcracking. It is suggested that by rationalizing this testing approach, it is possible to reduce not only the cost and inconvenience associated with different sizes of test specimens but also to enhance the relevance of some of the information obtained from such testing.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132895744","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}
{"title":"Measurement of the Pull-out Force at Different Rates of Loading","authors":"A. Pacios, Surendra P. Shah","doi":"10.14359/935","DOIUrl":"https://doi.org/10.14359/935","url":null,"abstract":"With the objective of understanding the reinforcing mechanisms of fibers in steel fiber reinforced concrete, the adherence between the fiber and the matrix is studied by conducting pull-out test of fibers from a cementitious matrix. In this paper the effect of factors such as loading rate, inclination of fibers, and number of fibers have been investigated. An innovative measurement system is developed for high rates. It was experimentally obtained that by increasing the rate of loading, both pull-out resistance and slip at peak were increased. Peak pull-out force presents a higher rate sensitivity for a higher number of fibers. The lower the number of fibers the higher the slip at peak rate sensitivity. Regardless of the number of fibers a higher rate sensitivity for inclined fibers was observed.","PeriodicalId":189804,"journal":{"name":"SP-155: Testing of Fiber Reinforced Concrete","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128245119","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}