Nordic Concrete Research最新文献_第2页

Effect of High-Pressure Washing on Chloride Ingress in Concrete – Development of an Accelerated Test Method 高压洗涤对混凝土中氯化物侵入的影响——一种加速试验方法的研制

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Nordic Concrete Research Pub Date : 2022-12-01 DOI: 10.2478/ncr-2022-0013

Louise Andersson, J. Silfwerbrand, Anders Selander, J. Trägårdh

{"title":"Effect of High-Pressure Washing on Chloride Ingress in Concrete – Development of an Accelerated Test Method","authors":"Louise Andersson, J. Silfwerbrand, Anders Selander, J. Trägårdh","doi":"10.2478/ncr-2022-0013","DOIUrl":"https://doi.org/10.2478/ncr-2022-0013","url":null,"abstract":"Abstract Bridges constitute an important part of the infrastructure. For bridges to have the longest possible service life with minimum repairs, the maintenance is of great importance. One type of bridge maintenance that is rarely researched is the continuous preventive maintenance. The continuous preventive maintenance consists of removal of vegetation, cleaning of bridge joints and drainage systems as well as high-pressure washing of the structure. The effect of washing is discussed but not properly researched. A study on the effectiveness of high-pressure washing on concrete is therefore being conducted. An accelerated test method is being developed to mimic field testing. The method has been developed through tests on small concrete specimens subjected to fluctuating temperature, fluctuating moisture, and repeatable exposure to de-icing salt during several cycles. The specimens are of two recipes where one represents an old concrete bridge with rather high water-cement ratio (0.6) and the other one represents a new concrete bridge with a low water-cement ratio (0.4). The first two versions of the method are described. The second version shows promising results, but the method needs further development to incorporate additional factors.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77258243","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

Is Cement Paste Modified with Carbon Nanomaterials Capable of Self-Repair after a Fire? 碳纳米材料改性水泥浆体是否具有火灾后的自修复能力?

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Nordic Concrete Research Pub Date : 2022-12-01 DOI: 10.2478/ncr-2022-0017

Magdalena Rajczakowska, M. Szeląg, K. Habermehl-Cwirzen, H. Hedlund, A. Ćwirzeń

引用次数: 1

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":null,"pages":null},"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

Asset Management of Existing Concrete Bridges Using Digital Twins and BIM: a State-of-the-Art Literature Review 现有混凝土桥梁资产管理使用数字孪生和BIM:最新的文献综述

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2021-0020

Vanessa Saback, C. Popescu, T. Blanksvärd, B. Täljsten

{"title":"Asset Management of Existing Concrete Bridges Using Digital Twins and BIM: a State-of-the-Art Literature Review","authors":"Vanessa Saback, C. Popescu, T. Blanksvärd, B. Täljsten","doi":"10.2478/ncr-2021-0020","DOIUrl":"https://doi.org/10.2478/ncr-2021-0020","url":null,"abstract":"Abstract The need to optimize investments in bridge maintenance has created a demand for improved bridge management systems (BMS). Outdated practices in bridge inspection and constant advances in information technology have also contributed to this demand. The use of Digital Twins (DT), although well established in other industries, is still incipient for asset management and structural analysis of bridges. There is a great deal of research on Building Information Modelling (BIM) for bridge inspection, but its post-construction potential is still under-explored. This study presents a state-of-the-art review of the literature on asset management for bridges using digital models such as BIM and digital twins. The review was conducting using a systematic approach. Despite the rapid increase in research on DT and the amount of existing research on BIM, several gaps remain to be addressed, such as the lack of consensus about the definition of digital twins, which has led to wrongful categorisation of digital models as DT. The complex data flow and software compatibility required to develop a functional DT have hindered the exploitation of their full potential so far. The integration of BIM post-construction to BMS and existing automation technologies can also significantly improve current practices of bridge management.","PeriodicalId":42762,"journal":{"name":"Nordic Concrete Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85533489","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

When and How Should Chloride Profiles be Calibrated for Paste Fraction? 浆料馏分的氯化物剖面何时及如何校准?

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Nordic Concrete Research Pub Date : 2022-07-01 DOI: 10.2478/ncr-2021-0021

Simon Fjendbo, K. De Weerdt, H. Sørensen, M. Geiker

引用次数: 1