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A composite cement of high magnesium sulphate resistance 高抗硫酸镁复合水泥
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-04-18 DOI: 10.3989/MC.2018.11316
A. Allahverdi, M. Akhondi, M. Mahinroosta
{"title":"A composite cement of high magnesium sulphate resistance","authors":"A. Allahverdi, M. Akhondi, M. Mahinroosta","doi":"10.3989/MC.2018.11316","DOIUrl":"https://doi.org/10.3989/MC.2018.11316","url":null,"abstract":"This study investigates the magnesium sulphate resistance of chemically activated phosphorus slag-based composite cement (CAPSCC). Enough mortar specimens were prepared from phosphorus slag (80 wt.%), type II Portland cement (14 wt.%), and compound chemical activator (6 wt.%) and were exposed to 5% magnesium sulphate solution after being cured. Mortar specimens of both type II and V Portland cements (PC2 and PC5) were also prepared and used for comparison purpose. According to the test results, after 12 months of exposure, PC2, PC5 and CAPSCC exhibited 43.5, 35.2 and 25.2% reduction in compressive strength, 0.136, 0.110, and 0.026% expansion in length, and 0.91, 2.2, and 1.78% change in weight, respectively. Complementary studies by X-ray diffractometry and scanning electron microscopy revealed that CAPSCC has a very low potential for the formation of sulphate attack products, especially ettringite. The results confirm a high magnesium sulphate resistance for CAPSCC compared to PC2 and PC5.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"154"},"PeriodicalIF":2.1,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43546426","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: 5
Ultrafine portland cement performance 超细硅酸盐水泥性能
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-04-13 DOI: 10.3989/MC.2018.03317
C. Argiz, E. Reyes, A. Moragues
{"title":"Ultrafine portland cement performance","authors":"C. Argiz, E. Reyes, A. Moragues","doi":"10.3989/MC.2018.03317","DOIUrl":"https://doi.org/10.3989/MC.2018.03317","url":null,"abstract":"By mixing several binder materials and additions with different degrees of fineness, the packing density of the final product may be improved. In this work, ultrafine cement and silica fume mixes were studied to optimize the properties of cement-based materials. This research was performed in mortars made of two types of cement (ultrafine Portland cement and common Portland cement) and two types of silica fume with different particle-size distributions. Two Portland cement replacement ratios of 4% and 10% of silica fume were selected and added by means of a mechanical blending method. The results revealed that the effect of the finer silica fume mixed with the coarse cement enhances the mechanical properties and pore structure refinement at a later age. This improvement is somewhat lower in the case of ultrafine cement with silica fume.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"157"},"PeriodicalIF":2.1,"publicationDate":"2018-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44555652","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: 3
Static and cyclic performance of cementitious composites reinforced with glass-fibres 玻璃纤维增强胶凝复合材料的静态和循环性能
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-03-05 DOI: 10.3989/MC.2018.10216
N. Arabi
{"title":"Static and cyclic performance of cementitious composites reinforced with glass-fibres","authors":"N. Arabi","doi":"10.3989/MC.2018.10216","DOIUrl":"https://doi.org/10.3989/MC.2018.10216","url":null,"abstract":"This paper concerns an experimental study of the influence of short glass-fibres randomly oriented of a reinforced cement-based composite on the mechanical behaviour. The matrix material parameters used are: cement/sand ratio and water/cement ratio fixed at 0.5; the glass-fibre content (0%, 0.5%, 1.0%, 1.5%, 2% and 2.5%) and fibre lengths (3, 6 and 12 mm). Composites mechanical characterisation under static behaviour at flexural and compression tests, shows that the reinforcement effect is beneficial only in flexural case. A synergy (matrix-reinforcement) was observed when fibre length of 12 mm is used with application rate of 2% in flexural. The fatigue behaviour determined by Wohler plots (stress-number of cycles to rupture), derived from experimental results; showed a large results dispersion which is attributed to many causes initiating this damage. The cyclic tests illustrate brittle character of these materials; even with low-amplitude cycles of loading no adaptation of these materials can be reported.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"146"},"PeriodicalIF":2.1,"publicationDate":"2018-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46548045","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: 3
Combined effect of nano-SiO 2 and nano-Fe 2 O 3 on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars 纳米sio2和纳米fe2o3对水泥砂浆抗压强度、抗折强度、孔隙率和电阻率的综合影响
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-03-05 DOI: 10.3989/MC.2018.10716
M. Sanjuán, C. Argiz, J. Gálvez, E. Reyes
{"title":"Combined effect of nano-SiO 2 and nano-Fe 2 O 3 on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars","authors":"M. Sanjuán, C. Argiz, J. Gálvez, E. Reyes","doi":"10.3989/MC.2018.10716","DOIUrl":"https://doi.org/10.3989/MC.2018.10716","url":null,"abstract":"The compressive strength, flexural strength, porosity and electrical resistivity properties of cement mortars with nano-Fe 2 O 3 and nano-SiO 2 are studied. Amorphous silica is the main component of pozzolanic materials due to its reaction with calcium hydroxide formed from calcium silicate (C 3 S and C 2 S) hydration. The pozzolanic reaction rate is not only proportional to the amount of amorphous silica but also to the surface area available for reaction. Subsequently, fine nano-Fe 2 O 3 and nano-SiO 2 particles in mortars are expected to improve mortar performance. The experimental results showed that the compressive strength of mortars with nano-Fe 2 O 3 and nano-SiO 2 particles were lower than those obtained with the reference mortar at seven and 28 days. It was shown that the nano-particles were not able to enhance mechanical strength on every occasion. The continuous microstructural progress monitored by mercury intrusion porosimetry (MIP) measurements, pore-size distribution (PSD), total porosity and critical pore diameter also confirmed such results.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"150"},"PeriodicalIF":2.1,"publicationDate":"2018-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47365431","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: 13
Defect characterization, diagnosis and repair of wood flooring based on a field survey 基于实地调查的木地板缺陷表征、诊断与修复
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-03-02 DOI: 10.3989/MC.2018.01817
A. Delgado, Clara Pereira, J. Brito, J. Silvestre
{"title":"Defect characterization, diagnosis and repair of wood flooring based on a field survey","authors":"A. Delgado, Clara Pereira, J. Brito, J. Silvestre","doi":"10.3989/MC.2018.01817","DOIUrl":"https://doi.org/10.3989/MC.2018.01817","url":null,"abstract":"A statistical characterization of defects in 35 buildings and 98 wood floorings (softwood and hardwood floors, and laminated and engineered wood floors), their diagnostic methods and repair solutions is presented. An expert system for inspecting wood flooring, comprising the classification of defects, their most probable causes, diagnostic methods and repair techniques, was used. Results include age, affected area, severity and frequency of defects and their main causes, as well as appropriate diagnostic methods, preventive and curative repair solutions most prescribed and the most significant correlations. Scratches were detected in more than five sixths of the sample, highly associated with exterior mechanical actions, and with an inadequate finishing layer. Wearing of the finishing layer was detected in a quarter of the inspected floorings. Accordingly, the application of a suitable finishing layer and, alternatively, its replacement are the most prescribed repair techniques.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"149"},"PeriodicalIF":2.1,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47668472","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: 10
The influence of untreated sugarcane bagasse ash on the microstructural and mechanical properties of mortars 未经处理的甘蔗渣灰对砂浆微观结构和力学性能的影响
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-02-19 DOI: 10.3989/MC.2018.13716
M. A. Maldonado-García, U. I. Hernández-Toledo, P. Montes-García, P. Valdez-Tamez
{"title":"The influence of untreated sugarcane bagasse ash on the microstructural and mechanical properties of mortars","authors":"M. A. Maldonado-García, U. I. Hernández-Toledo, P. Montes-García, P. Valdez-Tamez","doi":"10.3989/MC.2018.13716","DOIUrl":"https://doi.org/10.3989/MC.2018.13716","url":null,"abstract":"This study investigated the effects of the addition of untreated sugarcane bagasse ash (UtSCBA) on the microstructural and mechanical properties of mortars. The SCBA was sieved for only five minutes through a No. 200 ASTM mesh, and fully characterized by chemical composition analysis, laser ray diffraction, the physical absorption of gas, scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. Mortar mixtures with 0, 10 and 20% UtSCBA as cement replacement and a constant 0.63 water/cementitious material ratio were prepared. Fresh properties of the mortars were obtained. The microstructural characteristics of the mortars at 1, 7, 28, 90 and 600 days were evaluated by SEM and XRD. The compressive strengths of the mortars at the same ages were then obtained. The results show that the addition of 10 and 20% UtSCBA caused a slight decrease in workability of the mortars but improved their microstructure, increasing the long-term compressive strength.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"148"},"PeriodicalIF":2.1,"publicationDate":"2018-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43273001","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: 31
Effect of mix design on the size-independent fracture energy of normal- and high-strength self-compacting concrete 配合比设计对普通和高强自密实混凝土尺寸无关断裂能的影响
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-02-13 DOI: 10.3989/MC.2018.00717
H. Cifuentes, J. Ríos, E. J. Gómez
{"title":"Effect of mix design on the size-independent fracture energy of normal- and high-strength self-compacting concrete","authors":"H. Cifuentes, J. Ríos, E. J. Gómez","doi":"10.3989/MC.2018.00717","DOIUrl":"https://doi.org/10.3989/MC.2018.00717","url":null,"abstract":"Self-compacting concrete has a characteristic microstructure inherent to its specific composition. The higher content of fine particles in self-compacting concrete relative to the equivalent vibrated concrete produces a different fracture behavior that affects the main fracture parameters. In this work, a comprehensive experimental investigation of the fracture behavior of self-compacting concrete has been carried out. Twelve different self-compacting concrete mixes with compressive strength ranging from 39 to 124 MPa (wider range than in other studies) have been subjected to three-point bending tests in order to determine the specific fracture energy. The influence of the mix design and its composition (coarse aggregate fraction, the water to binder ratio and the paste to solids ratio) on its fracture behavior has been analyzed. Moreover, further evidence of the objectivity of the size-independent fracture energy results, obtained by the two most commonly used methods, has been provided on the self-compacting concrete mixes.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"144"},"PeriodicalIF":2.1,"publicationDate":"2018-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46511204","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: 11
Alkali-resistant glass fiber reinforced high strength concrete in simulated aggressive environment 模拟侵蚀环境下的耐碱玻璃纤维高强混凝土
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-02-13 DOI: 10.3989/MC.2018.13216
W. H. Kwan, C. Cheah, M. Ramli, K. Chang
{"title":"Alkali-resistant glass fiber reinforced high strength concrete in simulated aggressive environment","authors":"W. H. Kwan, C. Cheah, M. Ramli, K. Chang","doi":"10.3989/MC.2018.13216","DOIUrl":"https://doi.org/10.3989/MC.2018.13216","url":null,"abstract":"The durability of the alkali-resistant (AR) glass fiber reinforced concrete (GFRC) in three simulated aggresive environments, namely tropical climate, cyclic air and seawater and seawater immersion was investigated. Durability examinations include chloride diffusion, gas permeability, X-ray diffraction (XRD) and scanning electron microscopy examination (SEM). The fiber content is in the range of 0.6 % to 2.4 %. Results reveal that the specimen containing highest AR glass fiber content suffered severe strength loss in seawater environment and relatively milder strength loss under cyclic conditions. The permeability property was found to be more inferior with the increase in the fiber content of the concrete. This suggests that the AR glass fiber is not suitable for use as the fiber reinforcement in concrete is exposed to seawater. However, in both the tropical climate and cyclic wetting and drying, the incorporation of AR glass fiber prevents a drastic increase in permeability.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"147"},"PeriodicalIF":2.1,"publicationDate":"2018-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48720440","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: 14
Porous alkali activated materials with slow alkali release dynamic. Role of composition 多孔碱活性材料具有缓碱释放动态。作文的作用
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-02-07 DOI: 10.3989/MC.2018.14016
G. Bumanis, D. Bajare
{"title":"Porous alkali activated materials with slow alkali release dynamic. Role of composition","authors":"G. Bumanis, D. Bajare","doi":"10.3989/MC.2018.14016","DOIUrl":"https://doi.org/10.3989/MC.2018.14016","url":null,"abstract":"Alkali activated materials (AAM) based on calcined metakaolin or illite clay together with waste by-products, such as waste glass or aluminium scrap recycling waste, were tested as value-added materials for pH stabilization in biogas technology where decrease of pH should be avoided. Porous materials with ability to slowly leach alkalis in the water media thus providing continuous control of the pH level were obtained. XRD, FTIR, SEM and titration methods were used to characterize AAM and their leaching properties. It is clear that composition of the material has an important effect on the diffusion of alkali from structure. Namely, higher Si/Al and Na/Al molar ratios may increase pore solution transfer to the leachate. The leaching rate of alkalis from the structure of AAM is high for the first few days, decreasing over time. It was possible to calculate the buffer capacity from the mixture design of AAM.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"145"},"PeriodicalIF":2.1,"publicationDate":"2018-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47481553","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: 4
Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens 巴氏孢杆菌对压缩土试件强度特性的影响
IF 2.1 4区 工程技术
Materiales de Construccion Pub Date : 2018-02-05 DOI: 10.3989/MC.2018.12316
E. Bernat-Masó, L. Gil, C. Escrig, J. Barbé, P. Cortés
{"title":"Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens","authors":"E. Bernat-Masó, L. Gil, C. Escrig, J. Barbé, P. Cortés","doi":"10.3989/MC.2018.12316","DOIUrl":"https://doi.org/10.3989/MC.2018.12316","url":null,"abstract":"Microbial biodeposition of calcite induction for improving the performance of rammed earth is a research area that must be analysed in a representative environment. This analysis must consider the compaction force, particle size distribution and curing process as production variables. This paper investigates the effects of adding specific bacteria, Sporosarcina Pasteurii , into compressed earth cubes and the effect of production variables. Uniaxial compressive tests and direct shear tests have been conducted for 80 specimens. The results indicate that calcite precipitation interacts with the drying process of clay/silt resulting in reducing the compressive strength, the apparent cohesion and the friction angle. Finally, bacterial activity, which is more likely in samples cured in a high humidity environment, tends to reduce the dilatancy effect.","PeriodicalId":51113,"journal":{"name":"Materiales de Construccion","volume":"68 1","pages":"143"},"PeriodicalIF":2.1,"publicationDate":"2018-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45579538","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: 4
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