SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures最新文献_第4页

Behavior of Reinforced High-Strength Concrete Corbels/ Experimental Investigation and Design Model 钢筋高强混凝土梁的性能/试验研究与设计模型

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5571

Gilson Battiston Fernandes

引用次数: 3

Design For Durable Service Life/Linchpin For Sustainability in Concrete Construction 耐久性使用寿命设计/混凝土结构可持续性的关键

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5590

R. Swamy

引用次数: 5

Frost Durability of High-Performance Concrete Incorperating Slag or Silica Fume 含矿渣或硅粉高性能混凝土的抗冻性

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5569

M. Soeda, T. Yamato, Y. Emoto

{"title":"Frost Durability of High-Performance Concrete Incorperating Slag or Silica Fume","authors":"M. Soeda, T. Yamato, Y. Emoto","doi":"10.14359/5569","DOIUrl":"https://doi.org/10.14359/5569","url":null,"abstract":"This paper presents the results of laboratory studies conducted to determine freezing and thawing and scaling resistance of high-performance concrete. High-performance concretes were made using a combination of different cementitious materials (blast-furnace slag and silica fume). The water-to-cementitious materials ratio was 0.27, and the bulk volume of coarse aggregate and fine aggregate per unit volume of concrete were fixed at 0.50 and 0.60, respectively. All mixtures used a superplasticizer and were non-air-entrained. Test cylinders were cast for testing in compression at 1 and 28 days, and test prisms were cast for determining resistance to freezing and thawing cycles in accordance with ASTM C 666, Procedure A, and for resistance to scaling from deicing chemicals according to ASTM C 672. The curing methods were water curing and steam curing. The air-void parameters of the hardened concrete were determined on the sawn sections. The test results indicate that non-air-entrained, high-performance concrete with steam curing showed low durability factors. High-performance concrete with water curing performed satisfactorily when subjected to up to 1500 cycles of freezing and thawing. Water-cured, high-performance concrete showed no appreciable scaling after 100 freezing and thawing cycles, showing high resistance to scaling.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127365225","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: 1

Gas Permeability of High-Permeability of High-Performance Concrete Site and Laboratory Tests 高渗透高性能混凝土的现场透气性及室内试验

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5562

R. Torrent

引用次数: 2

Influence of Cement Type and Curing and Conditions on Initial Absorption of Concrete 水泥类型、养护条件对混凝土初始吸收的影响

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5570

G. Camarini, J. Balayssac, C. Detriche

{"title":"Influence of Cement Type and Curing and Conditions on Initial Absorption of Concrete","authors":"G. Camarini, J. Balayssac, C. Detriche","doi":"10.14359/5570","DOIUrl":"https://doi.org/10.14359/5570","url":null,"abstract":"This paper deals with the measurement of concrete durability by means of an initial absorption test of the concrete surface. The criterion used for this analysis is the amount of water absorbed after one hour. The specimens were placed in a constant water level of 1 cm, and the quantity of absorbed water was measured by mass. The influence of cement type, temperature, relative humidity and surface protection in the initial absorption was observed. Two concrete mixtures were made with ordinary portland cement blended with calcareous filler (12% and 25% by mass). These concretes were cured at two temperatures (20 degrees C and 40 degrees C) and different relative humidities (30%, 60% and 100%). In some specimens a curing compound was used to observe its influence on surface protection from initial water absorption. The concrete strengths ranged from 28 to 62 MPa. The esperimental results showed that by changing the relative humidity from 60% to 100% during 7 days, the initial absorption can diminish by a factor of 2. The curing temperature can increase the initial absorption by 64%. The curing compound has a real influence in the concrete initial absorption.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132028147","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: 5

Modeling of Serviceability Behavior of High-Performance Fiber Concrete Members 高性能纤维混凝土构件的使用性能建模

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5582

M. Aiello, L. Ombres

引用次数: 0

Chloride Penetration Profiles in Marine Environments 海洋环境中的氯化物渗透剖面

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5567

P. Castro, O. T. Rincón, E. Pazini

{"title":"Chloride Penetration Profiles in Marine Environments","authors":"P. Castro, O. T. Rincón, E. Pazini","doi":"10.14359/5567","DOIUrl":"https://doi.org/10.14359/5567","url":null,"abstract":"The chlorides from the sea and the marine breeze are the main source of corrosion in marine environments. Their penetration into concrete occurs through capillary absorption, diffusion or a mix of both. A chloride threshold for producing reinforcement corrosion can be predicted through mathematical models but the results may not be reliable if the action of environmental agents as the RH, temperature, winds, rains and drying periods are not well known. Although these limitations are recognized in several works, there are few field data in the literature to support, according to different exposure conditions, the form of the chloride penetration profiles. This work presents the form of chloride profiles from different exposure conditions. It discusses their behavior and justifies the results according to the presence of the environmental conditions. Some of the results indicate that the environments with chloride saturation produce profiles with a well defined concentraion gradient, while those with strong periods of rains, drying, winds, as well as strong variations of RH and temperature show a two-zone profile. In the last case, one zone is close to the concrete nucleus where the supposed reinforcement is positioned and that stays dampened due to the high chloride concentraion, and the other one is close to the concrete surface in which continuous wetting and drying cycles take place. It was also found that, under this research trial, the chloride penetration mechanism did not change with the micro-climate but nucleus concentration changed with the distance from the sea and concrete quality.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134251055","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: 9

Microstructural InvestigationI of Portland Cement Mortars Containing Varying Dosages Polynaphthalene Sulfonate Superplasticizer 掺加不同掺量聚萘磺酸盐减水剂的硅酸盐水泥砂浆微观结构研究

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5560

G. Xu, J. Beaudoin, C. Jolicoeur, M. Pagé

{"title":"Microstructural InvestigationI of Portland Cement Mortars Containing Varying Dosages Polynaphthalene Sulfonate Superplasticizer","authors":"G. Xu, J. Beaudoin, C. Jolicoeur, M. Pagé","doi":"10.14359/5560","DOIUrl":"https://doi.org/10.14359/5560","url":null,"abstract":"The effect of varying dosages of a polynapthalene sulfonate (PNS) superplasticizer on the microstructure of a portland cement paste, and on the microstructural and transition zone characteristics of a portland cement mortar, was investigated using AC impedance spectroscopy. Interpretation of the impedance and resistivity data was carried out in conjunction with data from mercury intrusion porosimetry, scanning electron microscopy, and other techniques. The addition of the PNS superplasticizer influences both the cement paste/sand interfacial region and the bulk paste component in the mortar. The transition zone was more porous at early hydration (around 4 hours) for mortars with high dosages of superplasticizer. The dosage levels also influence the morphology of the hydrates. Larger high frequency arcs and higher electrical resistance values were obtained for all the superplasticized mortars at one day and beyond. This suggests a modification in the pore structure and porosity of both the transition zone and the bulk paste due to presence of the superplasticizer. Mercury porosimetry, thermogravimetry and conduction calorimetry measurements support the interpretation of the AC impedance spectra.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134348161","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: 4

Estimation of Modulus of Elasticity In High-Performance Concrete Mix at Earlier and Later Ages 高性能混凝土配合比早期和后期弹性模量的估算

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5579

R. Pinto, K. Hover

引用次数: 1

Concrete Performance With Admixtures of Electrical Steel Slag and Copper Copper Concerning Mechanical Properties 电钢渣与铜外加剂混凝土性能研究

SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures Pub Date : 1999-05-01 DOI: 10.14359/5550

Washington Almeida Moura, A. Masuero, D. D. Molin, A. Vilela

引用次数: 46