Nordic Concrete Research最新文献_第2页

Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity 碱-二氧化硅反应性锂缓释的经验模型

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Nordic Concrete Research Pub Date : 2022-12-01 DOI: 10.2478/ncr-2022-0003

Mark Vacher, S. Jacobsen

引用次数: 0

Effect of Set Accelerator on Properties of Wet Sprayed Concrete 速凝剂对湿喷混凝土性能的影响

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2022-0005

Nicholas Trussell, Rolands Cepurītis, S. Jacobsen

引用次数: 3

Nonlinear Cyclic Analysis of Reinforced Concrete Columns Using Fiber Section Approach 钢筋混凝土柱非线性循环分析的纤维截面法

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2022-0002

A. Vatanshenas

引用次数: 0

Nordic Concrete Research workshop: “Accelerated freeze-thaw testing of concrete”, Lyngby, 20th April 2022 北欧混凝土研究研讨会:“混凝土的加速冻融试验”，Lyngby, 2022年4月20日

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2022-0007

Marianne Tange Hasholt, Katja Frid, F. Spörel, J. Lahdensivu, Elisabeth Helsing, Matthias Müller, Abdul Faheem, Sara Al Haj Sleiman, S. Jacobsen

引用次数: 0

Grading Material Properties in 3D Printed Concrete Structures 分级材料性能在3D打印混凝土结构

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2022-0004

José Hernández Vargas, H. Westerlind, J. Silfwerbrand

引用次数: 0

Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks 降低年轻混凝土约束引起的热裂缝风险——以水箱墙体为例

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2022-0001

Majid Al‐Gburi, J. Jonasson, M. Nilsson

{"title":"Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks","authors":"Majid Al‐Gburi, J. Jonasson, M. Nilsson","doi":"10.2478/ncr-2022-0001","DOIUrl":"https://doi.org/10.2478/ncr-2022-0001","url":null,"abstract":"Abstract Concrete cracks in structures such as water tanks and nuclear power stations cause anxiety to owners, contractors and engineers. These cracks may significantly increase the structure’s permeability and thus increase leakage, reduce durability, and eventually lead to loss of structural functionality. Therefore it is important to minimize their occurrence and size. To identify effective ways of minimizing cracking in young concrete segments, a parametric study was conducted using the finite element method (FEM). Parameters considered include casting sequence, joint position, wall height, and cooling. The study examined continuous and jumped casting approaches to the casting of a cylindrical reinforced concrete tank for a sewage-treatment plant, with and without the application of the ‘kicker’ technique in which the lower part of the wall is cast with the slab. The main cause of cracking is thermal change and restraint imposed by adjacent older structures, and the FEM predictions agree well with experimental observations. Continuous casting is most effective at minimizing cracking because it creates only two contact edges between newly cast and existing structures producing the lowest level of restraint. The kicker technique is shown to be very effective for reducing restraint and consider rephasing.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":"37 1","pages":"41 - 54"},"PeriodicalIF":1.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81380675","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

Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments 共振频率超声p波评价矿渣-水泥稳定沉积物单轴抗压强度

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Nordic Concrete Research Pub Date : 2021-12-01 DOI: 10.2478/ncr-2021-0012

P. Lindh, Polina Lemenkova

{"title":"Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments","authors":"P. Lindh, Polina Lemenkova","doi":"10.2478/ncr-2021-0012","DOIUrl":"https://doi.org/10.2478/ncr-2021-0012","url":null,"abstract":"Abstract Marine sediments can be stabilized by ultra high-strength binders: cement, Cement Kiln Dust (CKD) and slag. The properties of the stabilized soil indicate potential to their reuse. This study investigated the performance of the unconfined compressive strength (UCS) in the marine sediments stabilized by binder (cement, CKD, slag), tested by ultrasonic P-waves. Materials include 194 specimens collected from the port of Gothenborg. The experiment was performed in Swedish Geotechnical Institute (SGI). The UCS of specimens stabilized by different ratio of binders (cement, CKD, slag) was tested by resonance frequencies of the elastic P-waves. The significant increase in the UCS (>1500 kPa) was recorded for the highest values of CKD and cement, and low values of slag. The correlation profiles of low water/high binder (LW/HB) cement/slag (40/60%) were controlled by curing time. The slag–cement–CKD simplex tests demonstrated UCS of samples with low/high water content and various binder ratio of cement (kg/m3). The ratio of cement binder and curing time play a critical role in the increase of UCS followed by mechanical properties of specimens and intensity of stress. The highest values exceed 1000 m/s in P-waves. The results shown high accuracy (97%) and non-contacting approach for testing UCS of sediments. Seismic methods can be applied to test the UCS of the stabilized sediments, and also in-situ via seismic CPT, surface testing or cross hole seismic testing.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":"11 1","pages":"39 - 62"},"PeriodicalIF":1.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87527276","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: 20

Towards Efficient Use of Cement in Ultra High Performance Concrete 在超高性能混凝土中高效使用水泥

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Nordic Concrete Research Pub Date : 2021-12-01 DOI: 10.2478/ncr-2021-0017

I. Lande, R. T. Thorstensen

{"title":"Towards Efficient Use of Cement in Ultra High Performance Concrete","authors":"I. Lande, R. T. Thorstensen","doi":"10.2478/ncr-2021-0017","DOIUrl":"https://doi.org/10.2478/ncr-2021-0017","url":null,"abstract":"Abstract This paper presents an investigation on substituting the cement content with an inert material, in a typical locally produced UHPC mix. A structured literature review was performed to enrichen the discussion and to benchmark the results towards already reported investigations in the research society. Investigations on cement substitution in UHPC are frequently reported. However, usually the cement is substituted with other binding materials – often pozzolanic by-products from other industries. Reports from investigations on the use of inert materials for cement substitution in UHPC seem scarce. An experimental program that included a total of 210 test specimens was executed. This program included evaluating several questions embedded to the problem on how to substitute cement while keeping all other variables constant. It is concluded that up to 40% of the cement can be substituted with an inert material, without significantly changing the flexural tensile strength or compressive strength of the hardened UHPC. Two preconditions were caretaken: the particle packing was maintained by securing that the substitution material had a Particle Size Distribution (PSD) near identical to the cement and that the water balance was maintained through preconditioning of the substitution material. Suggestions are made for improving benchmarking.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":"61 1","pages":"81 - 105"},"PeriodicalIF":1.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85292618","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

Numerical Modelling of Heat Transport in Freezing Mortars with an External Liquid Reservoir 带外储液器的冻结砂浆热输运数值模拟

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Nordic Concrete Research Pub Date : 2021-12-01 DOI: 10.2478/ncr-2021-0019

A. Faheem, Maxime Ranger, Marianne Tange Hasholt

引用次数: 0

Evaluation of Rapid Repair of Concrete Pavements Using Precast Concrete Technology: A Sustainable and Cost-Effective Solution 使用预制混凝土技术快速修复混凝土路面的评估:一种可持续和经济的解决方案

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Nordic Concrete Research Pub Date : 2021-12-01 DOI: 10.2478/ncr-2021-0018

Saima Yaqoob, J. Silfwerbrand, L. Strömberg

{"title":"Evaluation of Rapid Repair of Concrete Pavements Using Precast Concrete Technology: A Sustainable and Cost-Effective Solution","authors":"Saima Yaqoob, J. Silfwerbrand, L. Strömberg","doi":"10.2478/ncr-2021-0018","DOIUrl":"https://doi.org/10.2478/ncr-2021-0018","url":null,"abstract":"Abstract Concrete and asphalt are the two competitive materials for a highway. In Sweden, the predominant material for the highway system is asphalt. But under certain conditions, concrete pavements are competitive alternatives. For example, concrete pavements are suitable for high-traffic volume roads, roads in tunnels, concentrated loads (e.g., bus stops and industrial pavement). Besides the load-carrying capacity, the concrete pavement has many advantages such as durability (wear resistance), resistance against frost heave, environment (pollution, recycling, and low rolling resistance leading to fuel savings), fire resistance, noise limitations, brightness, evenness and aesthetics. Concrete pavements are long-lasting but need final repair. Single slabs may crack in the jointed concrete pavement due to various structural and non-structural factors. Repair and maintenance operations are, therefore, necessary to increase the service life of the structures. To avoid extended lane closures, prevent traffic congestions, and expedite the pavement construction process, precast concrete technology is a recent innovative construction method that can meet the requirement of rapid construction and rehabilitation of the pavement. This paper evaluates rapid repair techniques of concrete pavement using precast concrete technology by analysing three case studies on jointed precast concrete pavements. The study showed that the required amount of time to re-open the pavement to traffic is dramatically reduced with jointed precast concrete panels.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":"29 1","pages":"107 - 128"},"PeriodicalIF":1.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86072712","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