Advanced Cement Based Materials最新文献_第6页

Influence of microstructural change under stress on the strength-related properties of hardened cement mortar and paste 应力作用下微结构变化对硬化水泥砂浆及膏体强度相关性能的影响

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90015-8

Hiroshi Uchikawa, Shunsuke Hanehara, Hiroshi Hirao

引用次数: 8

Sidney diamond symposium 悉尼钻石研讨会

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90025-0

引用次数: 0

The use of mercury intrusion porosimetry or helium porosity to predict the moisture transport properties of hardened cement paste 采用压汞孔隙度法或氦孔隙度法预测硬化水泥浆体的水分输运特性

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90019-5

G. Hedenblad

引用次数: 25

Microwave processing of glass-fiber reinforced composites—Modification of the microstructure 玻璃纤维增强复合材料的微波处理——微观结构的改变

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90018-3

Jean Pera, Jean Ambroise, Madeleine Oriol

{"title":"Microwave processing of glass-fiber reinforced composites—Modification of the microstructure","authors":"Jean Pera, Jean Ambroise, Madeleine Oriol","doi":"10.1016/S1065-7355(97)90018-3","DOIUrl":"10.1016/S1065-7355(97)90018-3","url":null,"abstract":"<div><p>The present article deals with the influence of microwave treatment on the properties of glass-fiber reinforced composites. The cement used in the matrices of the composites was either plain ordinary portland cement or metakaolin-blended cement. Two levels of microwave power were investigated: 40 W and 80 W for 1 hour 30 minutes. The behavior of such composites was compared to that of specimens cured at ambient conditions (20°C) and at 60°C and 90°C. The mechanical behavior was assessed by means of three-point flexure tests. The microstructure was investigated using differential thermal analysis, infrared spectrometry, and scanning electron microscopy. The results obtained show that microwave treatment enhanced the pozzolanic reaction between ordinary portland cement and metakaolin and the bond between the fibers and the matrix. Interfaces between fibers and matrix were also modified. The mechanical performances of the microwave-processed composites were very interesting at early ages, but microwave heating degraded some long-term properties, such as work of fracture and toughness.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 3","pages":"Pages 116-122"},"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)90018-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72598600","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: 8

Subject index to volume 6 第六卷的主题索引

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90029-8

引用次数: 0

Cement based cross-ply laminates 水泥基交叉层压板

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90022-5

A. Pivacek, G.J. Haupt, B. Mobasher

引用次数: 30

Study of the degree of hydration of concrete by means of image analysis and chemically bound water 用图像分析和化学结合水研究混凝土水化程度

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90017-1

M. Mouret, A. Bascoul, G. Escadeillas

{"title":"Study of the degree of hydration of concrete by means of image analysis and chemically bound water","authors":"M. Mouret, A. Bascoul, G. Escadeillas","doi":"10.1016/S1065-7355(97)90017-1","DOIUrl":"10.1016/S1065-7355(97)90017-1","url":null,"abstract":"<div><p>This article deals with the effect of both initial temperature and subsequent high curing temperature on the degree of hydration of normal strength concrete at the age of 28 days. Variations in compressive strength were observed and presented previously. Here, their causes are investigated through a difference in the hydration state in relation with the initial mixing and curing conditions. We present two ways of measuring the degree of hydration and compare the results, first by means of an original technique of image analysis on flat polished sections observed by scanning electron microscope, and second by classical measurement of the chemically bound water. Two kinds of specimens are studied. Cylinders of 11 cm × 22 cm were prepared with two different temperature formulae of constituents: 20°C (water)—20°C (aggregate)—20°C (cement); and 20°C (water)—70°C (aggregates)—70°C (cement), so as to obtain an initial temperature of the mixes between 20°C and 50°C, respectively. Specimens were sealed and cured under either controlled laboratory conditions or simulated conditions of hot weather. In each case, all the specimens were stored in water up to 28 days.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 3","pages":"Pages 109-115"},"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)90017-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78288899","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: 60

Discrete modeling of short-fiber reinforcement in cementitious composites 胶凝复合材料中短纤维增强的离散建模

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90014-6

J.E. Bolander Jr. , S. Saito

引用次数: 88

Microstructural based modelling of the elastic modulus of fiber reinforced cement composites 基于微结构的纤维增强水泥复合材料弹性模量建模

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90020-1

Albert Ngollè, Jean Péra

{"title":"Microstructural based modelling of the elastic modulus of fiber reinforced cement composites","authors":"Albert Ngollè, Jean Péra","doi":"10.1016/S1065-7355(97)90020-1","DOIUrl":"10.1016/S1065-7355(97)90020-1","url":null,"abstract":"<div><p>In this work, a new analytical model for predicting the elastic modulus of discontinuous fiber reinforced cement composites in uniaxial tension is presented. The proposed elastic modulus model depends on the macroscopic and microstructural parameters (interfacial bond modulus, matrix porosity, and so forth) of the composite. The microstructural scale is the fiber. The composite is considered to be a set of many fiber-matrix cells. The shear-lag concept is used to determine the forces and stress fields in the unit cell. The linkage between the microstructural and the macroscopic properties (homogenization) is made through an averaging process based on continuum mechanics, probabilistic considerations, and tensorial transformations. The model is applicable to all fiber orientations, probabilistic or deterministic. The particularities are that the model is triphasic and integrates the probabilistic density function of fiber orientation as a variable. Good agreement is observed between the model predictions and the limited experimental data available. The model is applicable to other discontinuous fiber reinforced quasibrittle matrix composites.</p></div>","PeriodicalId":100028,"journal":{"name":"Advanced Cement Based Materials","volume":"6 3","pages":"Pages 130-137"},"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)90020-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89112616","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: 11

Canadian international symposium 加拿大国际研讨会

Advanced Cement Based Materials Pub Date : 1997-10-01 DOI: 10.1016/S1065-7355(97)90024-9

引用次数: 0