Materiales de Construccion最新文献_第3页

Self-healing concrete-What Is it Good For? 自愈混凝土有什么好处?

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2021-03-09 DOI: 10.3989/MC.2021.07320

M. Roig-Flores, S. Formagini, P. Serna

引用次数: 16

Eco-efficient alkaline activated binders for manufacturing blocks and pedestrian pavers with low carbon footprint: Mechanical properties and LCA assessment 用于制造低碳足迹砌块和人行道摊铺机的环保碱性活性粘合剂：机械性能和LCA评估

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-12-30 DOI: 10.3989/mc.2020.17419

J. Mejía-Arcila, W. Valencia-Saavedra, R. Mejía de Gutiérrez

{"title":"Eco-efficient alkaline activated binders for manufacturing blocks and pedestrian pavers with low carbon footprint: Mechanical properties and LCA assessment","authors":"J. Mejía-Arcila, W. Valencia-Saavedra, R. Mejía de Gutiérrez","doi":"10.3989/mc.2020.17419","DOIUrl":"https://doi.org/10.3989/mc.2020.17419","url":null,"abstract":"This study proposes using two types of binders based on fly ash (FA) as primary raw material and a calcium source such as ground granulated blast furnace slag (GBFS) or Portland cement (OPC) for the production of eco-efficient pre-fabricated materials. These binders are denoted FA/GBFS (70/30) and FA/OPC (80/20). A mix of commercial sodium silicate and sodium hydroxide was used as a traditional activator (SN), and the mix of rice husk ash (RHA) and NaOH as an alternative activator (RN). The results show the possibility of obtaining a binary cement (FA/GBFS-RN) with compressive strength up to 38 MPa after curing for 28 days and 65 MPa after curing for 360 days. The hybrid binder (FA/OPC-RN) reported 30 MPa and 61 MPa at the same age of curing. Additionally, FA/GBFS-RN reports reductions in the environmental and health impacts of up to 75% compared to systems made with sodium silicate and sodium hydroxide. Based on the results, FA/ GBFS-RN paste was selected as the optimal material for producing masonry blocks and pedestrian pavers, which met the Colombian standards.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"70 1","pages":"232"},"PeriodicalIF":2.1,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49653419","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: 9

Application of novel synthesized nanocomposites containing κ-carrageenan/PVA/eggshell in cement mortars 新型合成κ-卡拉胶/聚乙烯醇/蛋壳纳米复合材料在水泥砂浆中的应用

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-11-04 DOI: 10.3989/mc.2020.06720

I. Sanrı-Karapınar, A. Pehlivan, S. Karakuş, A. E. Özsoy-Özbay, A. Yazgan, N. Taşaltın, A. Kilislioğlu

引用次数: 8

Thermal properties of cement mortar with different mix proportions 不同配合比水泥砂浆的热性能

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-09-15 DOI: 10.3989/mc.2020.09219

P. Shafigh, I. Asadi, A. R. Akhiani, N. Mahyuddin, M. Hashemi

{"title":"Thermal properties of cement mortar with different mix proportions","authors":"P. Shafigh, I. Asadi, A. R. Akhiani, N. Mahyuddin, M. Hashemi","doi":"10.3989/mc.2020.09219","DOIUrl":"https://doi.org/10.3989/mc.2020.09219","url":null,"abstract":"The energy required for the heating and cooling of buildings is strongly dependant on the thermal properties of the construction material. Cement mortar is a common construction material that is widely used in buildings. The main aim of this study is to assess the thermal properties of cement mortar in terms of its thermal conductivity, heat capacity and thermal diffusivity in a wide range of grades (cement: sand ratio between 1:2 and 1:8). As there is insufficient information to predict the thermal conductivity and diffusivity of a cement mortar from its physical and mechanical properties, the relationships between thermal conductivity and diffusivity and density, compressive strength, water absorption and porosity are also discussed. Our results indicate that, for a cement mortar with a 28-day compressive strength in the range of 6–60 MPa, thermal conductivity, specific heat and thermal diffusivity are in the range of 1.5–2.7 W/(m.K), 0.87–1.04 kJ/kg.K and 0.89–1.26 (x10 -6 m 2 /s), respectively. The scanning electron microscope (SEM) images showed that pore size varied from 18 μm to 946 μm for samples with different cement-to-sand ratios. The porosity of cement mortar has a significant effect on its thermal and physical properties. For this reason, thermal conductivity and thermal diffusivity was greater in cement mortar samples with a higher density and compressive strength.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"70 1","pages":"224"},"PeriodicalIF":2.1,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42163276","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: 38

Conductive concrete made from recycled carbon fibres for self-heating and de-icing applications in urban furniture 由回收碳纤维制成的导电混凝土，用于城市家具的自加热和除冰应用

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-09-15 DOI: 10.3989/MC.2020.17019

G. Faneca, T. Ikumi, J. Torrents, A. Aguado, I. Segura

{"title":"Conductive concrete made from recycled carbon fibres for self-heating and de-icing applications in urban furniture","authors":"G. Faneca, T. Ikumi, J. Torrents, A. Aguado, I. Segura","doi":"10.3989/MC.2020.17019","DOIUrl":"https://doi.org/10.3989/MC.2020.17019","url":null,"abstract":"This paper presents a broad experimental study performed at laboratory and industrial facilities to develop conductive concrete for self-heating and de-icing applications in urban furniture. Self-heating capacity is achieved by the application of electric current through a highly dense matrix containing recycled carbon fibers and graphite flakes. Prisms and slabs were fabricated with two different conductive concretes and electrode configurations to characterize the electrical properties and heating performance. Finally, 3 benches with different electrode disposals were fabricated to assess the heating capacity in real-scale applications. The results presented indicate promising results about the use of recycled carbon fibers for electrothermal concrete applications and identify the electrode configuration that allows the most efficient heat transfer and reduction of temperature gradients within the heated element. Real-scale tests show that the current technology developed is potentially applicable at de-icing applications in climates where temperatures remain within the range of -3 or -5 oC.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"70 1","pages":"223"},"PeriodicalIF":2.1,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46729888","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: 12

Microstructural analysis of concretes manufactured with recycled coarse aggregates pre-soaked using different methods 不同方法预浸再生粗骨料制备混凝土的微观结构分析

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-09-15 DOI: 10.3989/mc.2020.16919

Z. Sánchez-Roldán, I. Valverde-Palacios, I. Valverde-Espinosa, M. Martín-Morales

引用次数: 6

Alkali activation of recycled ceramic aggregates from construction and demolition wastes 建筑和爆破垃圾再生陶瓷骨料的碱活化研究

IF 2.1 4区工程技术

Materiales de Construccion Pub Date : 2020-09-15 DOI: 10.3989/mc.2020.13619

N. Gaibor, J. Coelho, D. Leitão, T. Miranda, P. Tavares, N. Cristelo

引用次数: 7

Use of industrial wastes for the synthesis of belite clinker 利用工业废料合成白石熟料