Magazine of Concrete Research最新文献_第8页

Influence of elevated temperatures on mode I and mode II fracture toughness and fracture energy of nanoclay reinforced polymer concrete 高温对纳米粘土增强聚合物混凝土I、II型断裂韧性和断裂能的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-12-04 DOI: 10.1680/jmacr.23.00163

Ali Abdi Aghdam, Mostafa Hassani Niaki

{"title":"Influence of elevated temperatures on mode I and mode II fracture toughness and fracture energy of nanoclay reinforced polymer concrete","authors":"Ali Abdi Aghdam, Mostafa Hassani Niaki","doi":"10.1680/jmacr.23.00163","DOIUrl":"https://doi.org/10.1680/jmacr.23.00163","url":null,"abstract":"Depending on the type of application, polymer concrete (PC) may be exposed to high temperatures. Therefore, it is important to investigate the influence of exposure to elevated temperatures on the fracture mechanics of PC. For this purpose, the PC composed of epoxy as resin, silica sand and crushed basalt as aggregates, and nanoclay as nanofiller is synthesized. The prepared PC is exposed to temperatures of 24, 40, 60, 80, 100, 120, and 140°C for two hours, and the residual fracture toughness and fracture energy in mode I and mode II are studied. Three-point bending test is conducted on cracked semi-circular bend specimens with the crack angle of 0° (pure mode I) and 41° (pure mode II) to determine the fracture parameters. Subjecting to high temperatures significantly increased the fracture toughness and fracture energy of the PC. The maximum fracture toughness and fracture energy are obtained after exposure to 120°C and 140°C, respectively. Scanning electron microscope (SEM) micrographs are used to investigate the fracture surface of the PC. The results of the present experimental research are useful in understanding the fracture mechanics behavior of PCs in mode I and mode II after being subjected to high temperatures.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138493759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Durability properties of lightweight concrete with ceramic mold casting waste 陶瓷模铸造废料轻量混凝土的耐久性研究

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-28 DOI: 10.1680/jmacr.23.00125

Zhiyou Jia, José Aguiar, Sandra Cunha, Carlos Jesus, Fernando Castro

引用次数: 0

Effects of hybrid metallic wastes on the strength and durability properties of cementitious mortars 杂化金属废弃物对胶凝砂浆强度和耐久性的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-27 DOI: 10.1680/jmacr.23.00122

Musa Yildirim, Hacer Bilir Özhan

{"title":"Effects of hybrid metallic wastes on the strength and durability properties of cementitious mortars","authors":"Musa Yildirim, Hacer Bilir Özhan","doi":"10.1680/jmacr.23.00122","DOIUrl":"https://doi.org/10.1680/jmacr.23.00122","url":null,"abstract":"The amount of industrial waste is increasing along with industrial production. Therefore, reusing or recycling these harmful wastes is quite a significant issue for waste management. Concrete, the most widely used material in the world, is a suitable place to use these wastes. This study used grinding swarf, which had not been used in cementitious composites before, and metal shaving from the CNC milling process. The effects of these wastes on the strength and durability of cement mortars were investigated by using them separately and in hybrid forms. Flowability, fresh unit weight, compressive strength, flexural strength, water absorption, and high-temperature effect tests were conducted on mortar samples. Although the wastes contributed when used alone, they yielded the highest contribution when combined. When the waste materials were used in a hybrid form, they increased compressive strength, flexural strength, and high-temperature resistance by 29%, 12.98%, and 49.50%, respectively. Metal shavings showed fiber effects, and grinding swarfs improved the strength and durability properties owing to their physical and chemical composition.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Load-bearing capacity of precast high-strength self-compacting recycled aggregate concrete column-to-column connections 预制高强度自密实再生骨料混凝土柱对柱连接的承载能力

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-27 DOI: 10.1680/jmacr.23.00109

Xiaoguang Chen, Zeger Sierens, Jiabin Li

引用次数: 0

Effect of an expansive agent on the interfacial bond and mechanical properties of carbon fibre-reinforced cement-based composites 膨胀剂对碳纤维增强水泥基复合材料界面结合及力学性能的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-27 DOI: 10.1680/jmacr.23.00098

Jinghui Dai, Jun Wang, Huigang Xiao

{"title":"Effect of an expansive agent on the interfacial bond and mechanical properties of carbon fibre-reinforced cement-based composites","authors":"Jinghui Dai, Jun Wang, Huigang Xiao","doi":"10.1680/jmacr.23.00098","DOIUrl":"https://doi.org/10.1680/jmacr.23.00098","url":null,"abstract":"Improving the flexural strength of a chopped-carbon fibre-reinforced cement-based composite while promoting good workability is highly attractive for building high-rise large-span structures. This study utilized a sulphoaluminate-based expansive agent to optimize the mechanical properties of chopped-carbon fibre-reinforced cement-based composites by improving the fibre–matrix interfacial properties. The results of a single-fibre pull-out test showed that the interfacial frictional bond strength improved up to 51% owing to the addition of the expansive agent, whereas the chemical debonding energy remained nearly unchanged. The study then investigated the effects of various concentrations of the expansive agent on the strength of the cement paste containing various lengths and volume fractions of the carbon fibre. The results indicated that benefited from the expansive agent induced high interfacial bond strength, the flexural strength and fluidity of the carbon fibre reinforced cement paste could be further optimized. For example, by utilizing expansive agent, the flexural strength could be further improved by 28% for cement paste containing 0.5% carbon fibre with length of 15mm.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shear thickening of cementitious suspensions: effect of high solid volume fraction and hydration 胶凝悬浮液的剪切增稠:高固相体积分数和水化的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-22 DOI: 10.1680/jmacr.23.00126

P. V. P. Moorthi, Prakash Nanthagopalan

{"title":"Shear thickening of cementitious suspensions: effect of high solid volume fraction and hydration","authors":"P. V. P. Moorthi, Prakash Nanthagopalan","doi":"10.1680/jmacr.23.00126","DOIUrl":"https://doi.org/10.1680/jmacr.23.00126","url":null,"abstract":"During pumping of concrete, the lubrication layer (LL) formed at the interface of the concrete and the pipe plays a crucial role in facilitating the process. Shear thickening in this layer affects the concrete pumping significantly. However, very few studies are available in understanding the onset and intensity of shear thickening behavior of the lubrication layer. In this study, the effect of solid volume fraction (SVF), superplasticizer (SP) dosage, supplementary cementitious materials (SCMs) and hydration on the shear thickening (Continuous and discontinuous) behavior of cementitious suspensions are investigated. Results show that an increase in SVF, reduces the shear thickening intensity in case of cement (OPC) systems whereas the intensity is amplified for systems with fly ash (FA) and ground granulated blast furnace slag (GGBS). An increment in the SP dosage results in an early onset and increases the shear thickening intensity, regardless of the binder used. GGBS based systems show the highest shear thickening intensity, followed by OPC and FA based systems. Based on the results, it is evident that the optimization of SP dosage for OPC based systems needs to be carried out based on the structural build-up, while for FA or GGBS based systems, the SP optimization needs to be carried out based on shear thickening behavior with respect to hydration.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Increasing service life of concretes in sewage treatment plants using silica fume and natural zeolite 使用硅灰和天然沸石提高污水处理厂混凝土的使用寿命

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-21 DOI: 10.1680/jmacr.23.00129

Ali Dousti, Negar Saraei, Mohammad Shekarchi, Mohammad Nikookar

{"title":"Increasing service life of concretes in sewage treatment plants using silica fume and natural zeolite","authors":"Ali Dousti, Negar Saraei, Mohammad Shekarchi, Mohammad Nikookar","doi":"10.1680/jmacr.23.00129","DOIUrl":"https://doi.org/10.1680/jmacr.23.00129","url":null,"abstract":"Microbiological attacks cause concrete structures used in wastewater collection and treatment facilities to deteriorate and degrade rapidly in short service lives. Hence, it is more cost-effective to produce concrete resistant to chemical and sulfuric acid corrosion. In the present study, a total of six concrete mixtures incorporating 7.5% silica fumes (SF) and 10% natural zeolite (ZE) were immersed in 0.5% and 1% sulfuric acid solutions with a maximum pH threshold of 2 and 1 respectively for 70 weeks to enhance concrete resistance to acid attack. The specimens were regularly monitored for surface deterioration, mass changes, and crushing load changes. To better understand the relationship between the pore structure of concrete mixtures and resistance to sulfuric acid, various durability tests such as rapid chloride penetration, water absorption, electrical resistivity, and chloride diffusion coefficient were performed. Based on the results obtained, it was concluded that converting calcium hydroxide (CH) into CSH gel through pozzolanic reactions and then refining the porosity of concrete with silica fume and natural zeolite was effective in enhancing the resistance of concrete to attack by sulfuric acid of relatively low concentration. As a result, using SF and ZE is a lower-cost method for reducing corrosion rates to extend the service life of facilities, particularly in lower concentrations.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of supplementary cementitious materials and fibers in ECC on the fire resistance of hot-jointed SCC/ECC composites ECC中补充胶凝材料和纤维对SCC/ECC热接复合材料耐火性能的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-21 DOI: 10.1680/jmacr.23.00023

Waqas Latif Baloch, Hocine Siad, Mohamed Lachemi, Mustafa Sahmaran

{"title":"Impact of supplementary cementitious materials and fibers in ECC on the fire resistance of hot-jointed SCC/ECC composites","authors":"Waqas Latif Baloch, Hocine Siad, Mohamed Lachemi, Mustafa Sahmaran","doi":"10.1680/jmacr.23.00023","DOIUrl":"https://doi.org/10.1680/jmacr.23.00023","url":null,"abstract":"This research examines the influence of various supplementary cementitious materials (SCMs) and fibers on the fire resistance of composite systems (CS) that combine engineered cementitious composites (ECC) in tension with self-compacting concrete (SCC) in compression. The study was designed to determine the ECC formulation ideally suitable for optimizing mechanical properties and bonding performance at ambient and elevated temperatures. The SCC and ECC were hot-joined without vibration or surface preparation, using a fresh-to-fresh casting method. Modifications to the chemical composition of ECC included the addition of Class-F fly ash (FAF), Class-C fly ash (FAC), or slag (SL), as well as polyvinyl alcohol (PVA) or steel reinforcing fibers. Subsequently, the samples were exposed to temperatures of 200 °C, 400 °C, 600 °C, and 800 °C, followed by comprehensive testing to evaluate their flexural strength, tensile strength, and interfacial properties. The results indicate that the incorporation of an ECC layer within the SCC system significantly improved mechanical strength, and thermal stability, both at ambient temperatures and under high-temperature conditions. Notably, the utilization of FAF in the ECC layer offered superior thermal stability and ensured the retention of desirable residual mechanical properties compared to FAC and SL. Moreover, steel fiber reinforcement greatly improved the bonding between SCC and ECC, outperforming PVA reinforcement at elevated temperatures.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138517460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal and mechanical properties of a sustainable bio-flax fiber based light-weight aggregate concrete 可持续生物亚麻纤维轻骨料混凝土的热力学性能

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-20 DOI: 10.1680/jmacr.23.00080

M. Chellapandian, J. Maheswaran, N. Arunachelam

引用次数: 0

Mortars containing waste plastic from WEEE as replacement of natural aggregate: different strategies to achieve good mechanical properties 含WEEE废塑料的砂浆替代天然骨料:不同的策略实现良好的力学性能

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-11-17 DOI: 10.1680/jmacr.23.00102

Luca Lavagna, Daniel Suarez-Riera, Nicoletta Mangani, Matteo Pavese

引用次数: 0