Advanced Cement Based Materials最新文献_第7页

Durability of simulated shredded rubber tire in highly alkaline environments 模拟碎橡胶轮胎在高碱性环境下的耐久性

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90021-3

H. Huynh, D. Raghavan

引用次数: 34

Author index to volume 5 第五卷的作者索引

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90026-2

引用次数: 0

Nonlinear transient phenomena in porous media with special regard to concrete and durability 多孔介质中的非线性瞬态现象，特别是混凝土和耐久性

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90013-4

B.F. Johannesson

{"title":"Nonlinear transient phenomena in porous media with special regard to concrete and durability","authors":"B.F. Johannesson","doi":"10.1016/S1065-7355(97)90013-4","DOIUrl":"10.1016/S1065-7355(97)90013-4","url":null,"abstract":"<div><p>Concrete deteriorates due to many different mechanisms. Among the most important mechanisms is the reinforcement corrosion induced by deleterious substances reaching the embedded reinforcement bars. The external sources of deleterious materials may, for example, be deicing salts, sea water, and carbon dioxide. Research has sought to determine threshold values, in terms of concentration of deleterious substances in concrete, at which reinforcement corrosion will be induced, that is, at which concentration the passive condition close to the reinforcement turns to an aggressive state. To predict when this threshold value is reached, the flow properties of the pollutant in concrete must be known. Some of the most important phenomena governing the movement of pollutants in concrete are diffusion of substances in the pore water, adsorption (and desorption) of pollutants onto the pore walls, and hydrodynamic dispersion and convection of substances due to flow of the pore water. Here a set of equations will be presented based on mass and energy balance. These coupled equations cope with the above-mentioned phenomena. The migration of ions due to an electric potential is not considered as only the initiation stage of corrosion is of interest. The constituents considered in the model are a solute γ (e.g., chlorides), the pore water α, and the solid phase s of the concrete, which is restricted to be nondeformable. The governed equation system is solved using the Petrov-Galerkin scheme and finite elements (compare references 1 and 2). Some examples of the performance of the proposed model are given.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 3","pages":"Pages 71-75"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1065-7355(97)90013-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74175871","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: 21

Subject index to volume 5 第五卷的主题索引

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90027-4

引用次数: 0

Early Strength Development and Hydration of Ordinary Portland Cement/Calcium Aluminate Cement Pastes 普通硅酸盐水泥/铝酸钙水泥浆体的早期强度发展与水化

Advanced Cement Based Materials Pub Date : 1997-08-01 DOI: 10.1016/S1065-7355(97)00008-4

Ping Gu , James J Beaudoin , Edmond G Quinn , Robert E Myers

引用次数: 76

A New Generation of High Performance Concrete: Concrete with Autogenous Curing 新一代高性能混凝土:自养护混凝土

Advanced Cement Based Materials Pub Date : 1997-08-01 DOI: 10.1016/S1065-7355(97)00009-6

Silvia Weber , Hans W. Reinhardt

{"title":"A New Generation of High Performance Concrete: Concrete with Autogenous Curing","authors":"Silvia Weber , Hans W. Reinhardt","doi":"10.1016/S1065-7355(97)00009-6","DOIUrl":"10.1016/S1065-7355(97)00009-6","url":null,"abstract":"<div><p>The literature and site data on the efficiency of curing are controversial regarding its effect on the mechanical properties of high strength concrete. The traditional methods of curing may fail in cases of concrete with a low water/binder ratio and with addition of silica fume. Hydration proceeds quickly, the hydrated cement paste is very dense, and water from the outside cannot reach the interior of the concrete to achieve complete hydration. Replacing 25% by volume of the aggregates by prewetted lightweight aggregates creates water storage inside the concrete, which supports continuous wet curing. The purpose of this article is to introduce a new type of high performance concrete. The materials used and their properties are shown, and the mixing procedure is given. The most important mechanical properties of the concrete under various curing conditions and the microstructure of the hardened cement paste were investigated. The results show that the method of introducing a water reservoir can be successfully applied to obtain high performance concrete with improved properties while being relatively insensitive to curing.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 2","pages":"Pages 59-68"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1065-7355(97)00009-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90208981","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: 201

Chemical Characterization of Calcium Aluminate-Phenol Resin Composite 铝酸钙-酚醛树脂复合材料的化学性质

Advanced Cement Based Materials Pub Date : 1997-08-01 DOI: 10.1016/S1065-7355(97)00005-9

Game Kankanamge Dinilprem Pushpalal , Toshio Kawano , Tadashi Kobayashi , Masaki Hasegawa

引用次数: 12

Mathematical Modeling of a Concrete Surface “Skin Effect” on Diffusion in Chloride Contaminated Media 混凝土表面“集肤效应”在氯化物污染介质中扩散的数学模型

Advanced Cement Based Materials Pub Date : 1997-08-01 DOI: 10.1016/S1065-7355(97)00002-3

Carmen Andrade , Jose Miguel Dı́ez , Cruz Alonso

{"title":"Mathematical Modeling of a Concrete Surface “Skin Effect” on Diffusion in Chloride Contaminated Media","authors":"Carmen Andrade , Jose Miguel Dı́ez , Cruz Alonso","doi":"10.1016/S1065-7355(97)00002-3","DOIUrl":"10.1016/S1065-7355(97)00002-3","url":null,"abstract":"<div><p>Concrete skin is considered the closest zone to the surface of concrete cover of reinforcements. It usually has a different composition than the internal concrete due to phenomena such as contact with molds or segregation of aggregates. In addition, environmental actions induce a gradient of moisture along the cover depth. These circumstances sometimes produce an irregular chloride profile in the cover, which either exhibits a maximum of chloride content some millimeters inside the outer surface or sometimes shows an anomalously high chloride concentration right at the concrete surface. In the present paper, analytical modeling of chloride diffusion is used to study the relative influence of the skin thickness. This theoretical analysis aims to show that there are cases where, if the diffusivity of the skin and the bulk concrete are very different, an error is introduced when the “skin effect” is not accounted for. The clarification of this error may contribute to understanding the differences found between laboratory experiments and the long-term record of chloride profiles in the same concrete.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 2","pages":"Pages 39-44"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1065-7355(97)00002-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79199107","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: 142

Sidney diamond symposium 悉尼钻石研讨会

Advanced Cement Based Materials Pub Date : 1997-06-01 DOI: 10.1016/S1065-7355(97)90006-7

引用次数: 1

Interface property characterization and strengthening mechanisms in fiber reinforced cement based composites 纤维增强水泥基复合材料界面性能表征及增强机理

Advanced Cement Based Materials Pub Date : 1997-06-01 DOI: 10.1016/S1065-7355(97)90001-8

Victor C. Li , Henrik Stang

{"title":"Interface property characterization and strengthening mechanisms in fiber reinforced cement based composites","authors":"Victor C. Li , Henrik Stang","doi":"10.1016/S1065-7355(97)90001-8","DOIUrl":"10.1016/S1065-7355(97)90001-8","url":null,"abstract":"<div><p>The properties of the fiber/matrix interface are of primary significance for the overall behavior of fiber reinforced cement based composites. The present paper gives an overview of the current knowledge regarding characterization and engineering of the interface. First, different mathematical models for the characterization of interface properties are reviewed, including strength as well as toughness based models, and basic interfacial parameters are identified. Second, engineering tools are reviewed—primarily ways of increasing the fiber/matrix bond by applying various strengthening techniques, including introduction of fiber deformations, densification of the porous fiber/matrix interfacial transition zone, and fiber surface modification using plasma treatment. The strengthening mechanisms are quantified through basic interfacial parameters, and it is shown by reference to available experimental evidence that substantial improvements in the fiber/matrix bond can be achieved, opening up the field for further optimization of fiber reinforced cement based composites. Finally, gaps in the present knowledge are pointed out, identifying areas of future research in this area.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 1","pages":"Pages 1-20"},"PeriodicalIF":0.0,"publicationDate":"1997-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1065-7355(97)90001-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91543137","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: 207