International Journal of Cement Composites and Lightweight Concrete最新文献_第10页

Tensile strength and toughness of FRC materials FRC材料的拉伸强度和韧性

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90036-X

B. Barr , A. Asghari , T.G. Hughes

{"title":"Tensile strength and toughness of FRC materials","authors":"B. Barr , A. Asghari , T.G. Hughes","doi":"10.1016/0262-5075(88)90036-X","DOIUrl":"https://doi.org/10.1016/0262-5075(88)90036-X","url":null,"abstract":"<div>A new compact tensile test specimen is reported. The test specimen is prepared by the introduction of two notches into a prismatic member. The geometry is loaded through four points in such a way that a zone of high tensile stresses is created along the line joining the roots of the two notches.Experimental results are given for plain concrete, polypropylene FRC and steel FRC. Both the tensile strength and the post-cracking toughness are investigated. The post-cracking toughness is measured by means of two toughness indices.The results show that the tensile strength is increased as the slot separation distance is decreased. This effect may be due to a larger stress concentration being created as the slot separation distance is increased. The tensile strengths recorded for the FRC mixes were relatively independent of fibre content.The toughness index results showed that the post-cracking toughness increased with increasing fibre content. Comparison with flexural testing shows, however, that the toughness in tension is much less than the toughness achieved during flexural testing.Throughout the experimental study, the coefficient of variation was rather high. A detailed comparison of this geometry with other methods of tensile strength determination is recommended.</div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"10 2","pages":"Pages 101-107"},"PeriodicalIF":0.0,"publicationDate":"1988-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(88)90036-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91755684","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: 7

Development of high strength lightweight concrete for structural applications 结构用高强轻量化混凝土的发展

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90034-6

H.S. Wilson , V.M. Malhotra

{"title":"Development of high strength lightweight concrete for structural applications","authors":"H.S. Wilson , V.M. Malhotra","doi":"10.1016/0262-5075(88)90034-6","DOIUrl":"https://doi.org/10.1016/0262-5075(88)90034-6","url":null,"abstract":"<div>The use of superplasticizers and mineral admixtures, particularly condensed silica fume, has led to the development of high strength, normal weight concretes for structural applications. The judicious use of these materials has resulted in concrete compressive strengths exceeding 100 MPa.Notwithstanding the relatively low strength of lightweight aggregates, this investigation reports results of a study undertaken to develop high strength lightweight concretes using a Canadian lightweight aggregate. A series of seven concrete mixtures involving 25 batches were made. The cement, or cements, fly ash and silica fume content of the mixtures ranged from 300 to 635 kg/m3. All mixtures were air entrained and superplasticized. A large number of test cylinders and prisms were cast for the determination of the mechanical properties of concrete and to evaluate its resistance to freezing and thawing cycling, performed in accordance with ASTM C 666 Procedure A.From the results of this investigation, it is concluded that high strength concretes with densities of less than 2000 kg/m3 can be made with or without the use of mineral admixtures, but the use of superplasticizers is mandatory. The highest compressive strength achieved was 66.5 MPa at 365 days for a cementitious content of 638 kg/m3. The 28-day splitting-tensile strengths obtained were of the order of 3.5 MPa. The freezing and thawing tests performed in accordance with ASTM C 666 Procedure A, freezing in water and thawing in water, indicated excellent frost resistance of concrete with durability factors generally greater than 90.</div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"10 2","pages":"Pages 79-90"},"PeriodicalIF":0.0,"publicationDate":"1988-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(88)90034-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91755686","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: 40

The analysis of reinforced concrete beams strengthened by epoxy bonded steel plates 环氧粘结钢板加固钢筋混凝土梁的分析

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90033-4

O. Vilnay

引用次数: 100

Properties of concrete made with fly ash 粉煤灰混凝土的性能研究

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90037-1

Marina Álvarez , Julián Salas , Janer Veras

引用次数: 13

Uniformity of cement strength 水泥强度均匀性

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90045-0

引用次数: 0

Continuing education 继续教育

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90047-4

引用次数: 0

TENSILE STRENGTH AND TOUGHNESS OF FRC MATERIALS FRC材料的拉伸强度和韧性

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90036-X

B. Barr, A. Asghari, T. Hughes

引用次数: 7

Properties of concrete made with fly ash 粉煤灰混凝土的性能研究

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90037-1

Marina Alvarez, Julián Salas, J. Veras

引用次数: 17

Development of high strength lightweight concrete for structural applications 结构用高强轻量化混凝土的发展

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90034-6

H. S. Wilson, V. Malhotra

引用次数: 42

News: conferences and symposia 新闻:会议和专题讨论会

International Journal of Cement Composites and Lightweight Concrete Pub Date : 1988-05-01 DOI: 10.1016/0262-5075(88)90046-2

引用次数: 0