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International Journal of Cement Composites and Lightweight Concrete最新文献

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Load relaxation in steel fibres embedded in cement matrices 水泥基体中嵌入钢纤维的载荷松弛
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90103-6
Nemkumar Banthia , Michel Pigeon
{"title":"Load relaxation in steel fibres embedded in cement matrices","authors":"Nemkumar Banthia ,&nbsp;Michel Pigeon","doi":"10.1016/0262-5075(89)90103-6","DOIUrl":"10.1016/0262-5075(89)90103-6","url":null,"abstract":"<div><p>Twenty-four hour load relaxation curves were obtained from single fibre pull-out specimens with 60 and 80% of the peak pull-out load applied as the initial load. Two fibre types, hooked and crimped, and two matrices, cement paste and microsilica cement paste, were investigated. Tests were conducted at the ages of 1, 7 and 28 d. Two test temperatures of 22°C and 100°C were chosen</p><p>Relaxation, as defined by the percent reduction in the applied initial load, was found to decrease with age and was found to increase with the applied initial load; microsilica addition resulted in a reduced relaxation. Hooked fibres were found to relax more than the crimped fibres. A high temperature of 100°C was found to significantly increase the relaxation. After 24 h of relaxation, the specimens, in general, had a poorer pull-out performance as measured by the peak pull-out load and the pull-out energy, compared to the virgin specimens.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Pages 229-234"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90103-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80670211","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
Improvement of concrete durability 提高混凝土耐久性
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90109-7
{"title":"Improvement of concrete durability","authors":"","doi":"10.1016/0262-5075(89)90109-7","DOIUrl":"https://doi.org/10.1016/0262-5075(89)90109-7","url":null,"abstract":"","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Page 257"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90109-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136530523","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: 0
Concrete and its chemical behaviour 混凝土及其化学行为
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90111-5
{"title":"Concrete and its chemical behaviour","authors":"","doi":"10.1016/0262-5075(89)90111-5","DOIUrl":"https://doi.org/10.1016/0262-5075(89)90111-5","url":null,"abstract":"","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Page 258"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90111-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136533159","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: 0
Pore structure of hardened cement paste and mortar 硬化水泥浆和砂浆的孔隙结构
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90105-X
D.C. Okpala
{"title":"Pore structure of hardened cement paste and mortar","authors":"D.C. Okpala","doi":"10.1016/0262-5075(89)90105-X","DOIUrl":"10.1016/0262-5075(89)90105-X","url":null,"abstract":"<div><p>The paper describes an experimental investigation into the pore structure of hardened cement paste and mortar. The pore structure was studied using mercury porosimeter. Ordinary portland cement and natural river sand were used. Pore structure determination was carried out for both the cement paste and mortar mixes over four hydration periods and five water-cement ratios. The threshold radius which was found to be prominent in the hardened cement paste, flattens out as the fine aggregate content increased.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Pages 245-254"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90105-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77167888","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: 28
Behaviour of Ca(OH)2 in polymer modified mortars Ca(OH)2在聚合物改性砂浆中的行为
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90104-8
M.U.K. Afridi , Y. Ohama , M.Zafar Iqbal , K. Demura
{"title":"Behaviour of Ca(OH)2 in polymer modified mortars","authors":"M.U.K. Afridi ,&nbsp;Y. Ohama ,&nbsp;M.Zafar Iqbal ,&nbsp;K. Demura","doi":"10.1016/0262-5075(89)90104-8","DOIUrl":"10.1016/0262-5075(89)90104-8","url":null,"abstract":"<div><p>This paper deals with the effect of polymer modification on the behaviour of Ca(OH)<sub>2</sub> in modified mortars. The polymer modified mortars were prepared using powdered emulsions and aqueous polymer dispersons at various polymer-cement ratios; they were then tested for air content, moulded into specimens and cured. The cured specimens were tested for compressive strength. The fine powder samples obtained from broken specimens were subjected to X-ray diffraction, differential thermal analysis and thermogravimetric analysis. From the test results, it is concluded that formation of Ca(OH)<sub>2</sub> in the polymer modified mortars is reduced possibly because of the absorption of Ca(OH)<sub>2</sub> on polymer films formed in the mortars. The extent of reduction in the quantity of Ca(OH)<sub>2</sub> depends upon the polymer-cement ratio, polymer type or both. Generally powdered poly(vinyl acetate-vinyl carboxylate), poly(ethylene-vinyl acetate) emulsions and aqueous poly(ethylene-vinyl acetate) emulsion were found to be more effective than styrene butadiene rubber latex in reducing the quantity of Ca(OH)<sub>2</sub> in the modified mortars. The cement modifiers did not cause any detrimental effect on the degree of hydration as indicated by their higher compressive strength. Estimation of the quantity of Ca(OH)<sub>2</sub> in the polymer modified mortars therefore, does not provide a proper means for predicting their degree of hydration.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Pages 235-244"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90104-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80192376","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: 50
Chloride corrosion of steel fibre reinforcement in cement mortar 水泥砂浆中钢纤维钢筋的氯化物腐蚀
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90102-4
I. Janotka , Ľ. Krajčí , K. Komloš , D. Frťalová
{"title":"Chloride corrosion of steel fibre reinforcement in cement mortar","authors":"I. Janotka ,&nbsp;Ľ. Krajčí ,&nbsp;K. Komloš ,&nbsp;D. Frťalová","doi":"10.1016/0262-5075(89)90102-4","DOIUrl":"10.1016/0262-5075(89)90102-4","url":null,"abstract":"<div><p>This paper presents an experimental study on the corrosion resistance of steel fibres and steel bar reinforcement in cement mortar. The mortar matrix incorporated various amounts of calcium chloride from 2 to 10%, and the rate of corrosion was monitored by the electrode potential method. The structure of the mortar and the steel surfaces were examined by scanning electron microscopy. The results showed that the addition of calcium chloride modified the microstructure of the mortar matrix, both its water absorption capacity and its porosity increased with increasing amounts of calcium chloride. The electric potential measurements showed that while the bar reinforcement displayed corrosion at 2% calcium chloride, the fibres did not indicate any harmful corrosion until the chloride content was 6%. Chloride admixtures added to concrete may thus be less harmful to steel in steel fibre concrete than in reinforced concrete.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Pages 221-228"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90102-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85183545","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: 30
Editorial comment 社论评论
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-11-01 DOI: 10.1016/0262-5075(89)90099-7
{"title":"Editorial comment","authors":"","doi":"10.1016/0262-5075(89)90099-7","DOIUrl":"https://doi.org/10.1016/0262-5075(89)90099-7","url":null,"abstract":"","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 4","pages":"Page 203"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90099-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136557341","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: 0
Production of high strength concrete 生产高强度混凝土
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-08-01 DOI: 10.1016/0262-5075(89)90096-1
{"title":"Production of high strength concrete","authors":"","doi":"10.1016/0262-5075(89)90096-1","DOIUrl":"10.1016/0262-5075(89)90096-1","url":null,"abstract":"","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 3","pages":"Page 194"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90096-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102643508","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: 3
Bonding in polypropylene fibre reinforced concretes 聚丙烯纤维增强混凝土中的粘结
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-08-01 DOI: 10.1016/0262-5075(89)90087-0
A. Bentur , S. Mindess , G. Vondran
{"title":"Bonding in polypropylene fibre reinforced concretes","authors":"A. Bentur ,&nbsp;S. Mindess ,&nbsp;G. Vondran","doi":"10.1016/0262-5075(89)90087-0","DOIUrl":"10.1016/0262-5075(89)90087-0","url":null,"abstract":"<div><p>The geometry of fibrillated polypropylene fibres after mixing in concrete, and the nature of the fibre interface in the hardened concrete, were characterised by optical and scanning electron microscopy, to resolve the bonding mechanisms in this system. It is suggested that two effects contribute to the fibre-matrix interaction: interfacial adhesion and mechanical anchoring. The first is apparently due to the intimate contact at the interface and the dense matrix developed in the transition zone, and the second is associated with a combination of: (a) filamentising, where the bundles separate into multifilament strands during mixing, (b) branching of the fibrils, and (c) forming of tiny fibrillations on the fibre surface, all of which can contribute to interlocking with the matrix.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 3","pages":"Pages 153-158"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90087-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81895493","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: 46
Wastepaper fibres in cement products 水泥制品中的废纸纤维
International Journal of Cement Composites and Lightweight Concrete Pub Date : 1989-08-01 DOI: 10.1016/0262-5075(89)90085-7
R.S.P. Coutts
{"title":"Wastepaper fibres in cement products","authors":"R.S.P. Coutts","doi":"10.1016/0262-5075(89)90085-7","DOIUrl":"10.1016/0262-5075(89)90085-7","url":null,"abstract":"<div><p>Wastepaper is an acceptable reinforcement for cement products. At fibre loadings of approximately 12% by mass the air cured cement composite has flexural strength of 18.2 MPa, fracture toughness value of approximately 1.0 kJ/m<sup>2</sup>, water absorption value of 25% and a density of 1.43 g/cm<sup>3</sup>. Quality wood fibre reinforcement (<em>P. radiata</em> kraft pulp) provides similar values of water absorption and density but has superior values of flexural strength (28 MPa) and fracture toughness (2.3 J/m<sup>2</sup>) at similar fibre content (12% by mass). The cost of wastepaper is, however, only 15–25% that of <em>P. radiata</em> kraft pulp and for certain applications must have an economic advantage over the more expensive kraft reinforcement.</p></div>","PeriodicalId":100692,"journal":{"name":"International Journal of Cement Composites and Lightweight Concrete","volume":"11 3","pages":"Pages 143-147"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0262-5075(89)90085-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84205891","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: 18
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