Revista de la Construccion最新文献_第3页

Gravel impact compaction piers as a method of soil improvement 碎石冲击压实桥墩作为土壤改良的一种方法

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.539

B. Niroumand, H. Niroumand

{"title":"Gravel impact compaction piers as a method of soil improvement","authors":"B. Niroumand, H. Niroumand","doi":"10.7764/rdlc.21.3.539","DOIUrl":"https://doi.org/10.7764/rdlc.21.3.539","url":null,"abstract":"The purpose of this study was to evaluate the performance of gravel impact compaction piers system (GICPs) in improving a 3.5m thick loose silty sand in a multilayer coastal soil system located in Bushehr, Iran. The liquefiable sandy soil layer was layered on clay layers with moderate to very stiff consistency and below the engineering embankment layer with a thickness of 1.8 m. Implementation of gravel impact compaction piers is a new generation of aggregate piers. Gravel impact compaction piers were used to improve the liquefiable soil layers and to increase the bearing capacity and reduce subgrade settlement to withstand surface infrastructures. The process of making gravel impact compaction piers in a triangular or square-patterned grid was created using three types of special mandrels and feeding and compacting the gravels in the cavity in several stages without removing the soil from the cavities. The experience gained in this case study showed that artificial liquefiable was created immediately after the construction of these piers in a limited area and the soil became unstable. After about 11-14 days, the soil stabilized rapidly. The results of the standard penetration test in the matrix soil around the piers showed that the amount of (N1)60 in compacted soils was in the range of 21-30 and on average 15 times the amount of (1-3) in the initial soil. Also, the relative density of the initial soil was increased from 25% to 75% after soil improvement. Accordingly, by relying merely on the compaction properties of the piers and without relying on other primary soil remediation factors, such as piers drainage and soil texture change, the safety factor of the improved soil is 1.7-1.95 times the minimum required according to the two risk levels in the design.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71305939","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

Recent hydraulic bridge failures in China: review and discussion 近年来中国液压桥梁事故的回顾与讨论

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.2.193

S. Qin

引用次数: 1

Improving flexible pavement performance through suitable aggregate gradation 通过合适的骨料级配改善柔性路面性能

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.2.295

Mohammad Razeq Shakhan, A. Topal, B. Sengoz

引用次数: 0

Effect of industrial wastes on self-cleaning properties of concrete containing anatase-TiO2 工业废料对含锐钛矿- tio2混凝土自洁性能的影响

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.493

Serdal Ünal, M. Canbaz

{"title":"Effect of industrial wastes on self-cleaning properties of concrete containing anatase-TiO2","authors":"Serdal Ünal, M. Canbaz","doi":"10.7764/rdlc.21.3.493","DOIUrl":"https://doi.org/10.7764/rdlc.21.3.493","url":null,"abstract":"Concrete decomposing the organic compounds on because of natural or anthropogenic contaminating sources with photocatalysis existing in its structure is called self-cleaning concrete. In this study, the self-cleaning concrete with industrial waste has been searched from the point of mechanical and physical characteristics. Fly ash, blast furnace slag and sepiolite materials has been used as industrial waste in concrete. Titanium dioxide (TiO2) has been used as photocatalysis material. Specimens with the dimensions 15×15×15 cm were produced using 0 %, 10 %, 20 % and 30 % industrial wastes and 0 %, 1 %, 3 %, 5 % TiO2 by weight instead of cement. Compressive strength, unit weight, and ultrasonic pulse velocity tests were performed on the specimens after 28 days standard cure. Rhodamine-B test in Italian UNI 11259 standard and additional Phenantroquinone test have been performed as self-cleaning test. XRF test also has been made on some of the samples for the chemical analysis. The best photocatalysis performance has showed in the concrete including 5 % TiO2. Test results show that 10 % use of industrial wastes in self-cleaning concrete production is recommended from the point of economic and environmental benefits","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71305892","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: 2

Experimental and numerical dynamic identification in an RC tower 钢筋混凝土塔的试验与数值动力辨识

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.555

F. Aras, Tarık Tufan

{"title":"Experimental and numerical dynamic identification in an RC tower","authors":"F. Aras, Tarık Tufan","doi":"10.7764/rdlc.21.3.555","DOIUrl":"https://doi.org/10.7764/rdlc.21.3.555","url":null,"abstract":"In this study, the dynamic behavior of one of the prominent structures in Istanbul, Üsküdar Observation Tower (UOT) has been investigated. The structural system of the tower is formed by a reinforced concrete circular tube having 2.8 meters outside diameter with a 40 centimeter thickness. By referring to the ground level, it starts from -18.2 meter due to five basement stories around the tower and its height is 44 meters. Two reinforced concrete floors were partially hanged over at 36 meter and 40 meter in height. The tower has an independent structural system from the ground level but a non-structural cladding assembly connects it to an adjacent building in the complex. With the mentioned structural features, Ambient Vibration Survey (AVS) was utilized to obtain the dynamic characteristics of UOT by Peak Picking (PP) method. The obtained dynamic properties were discussed with the peculiarities of UOT. While the performed analysis revealed the ineffectiveness of the adjacent building and the underground stories in the dynamic behavior of UOT, the torsion action of the floors has been noted. A numerical model has also been constructed to obtain the dynamic characteristics of UOT by Finite Element Analysis (FEA). The model calibration required to increase the code-based modulus of elasticity of the concrete by 23% for pairing the experimental and numerical dynamic properties. The reasons of the increase and the correlation between AVS and FEA were discussed.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71305947","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

Acoustic absorption prediction by placing absorbent material in separate pieces with or without back air layer 通过将吸声材料分开放置，有或没有后空气层来预测吸声

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.1.156

M. Morales-Segura, D. Caballol, Á. Raposo, Francisco Gil-Carrillo

引用次数: 0

Effects of particle size optimization of quartz sand on rheology and ductility of engineered cementitious composites 石英砂粒径优化对工程胶凝复合材料流变性和延性的影响

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.2.447

H. Karaca, Kamil Tekin, Süleyman Bahadır Keskin, Özlem Kasap Keskin

{"title":"Effects of particle size optimization of quartz sand on rheology and ductility of engineered cementitious composites","authors":"H. Karaca, Kamil Tekin, Süleyman Bahadır Keskin, Özlem Kasap Keskin","doi":"10.7764/rdlc.21.2.447","DOIUrl":"https://doi.org/10.7764/rdlc.21.2.447","url":null,"abstract":"In this study, the effect of particle size of quartz sand on the fresh and hardened properties of engineered cementitious composites (ECC) was investigated. For this purpose, three ECC mixtures that are identical except for the gradation of quartz sands used in their composition were designed. One of the mixtures includes a combination of quartz sands with amounts determined by the Andreasen and Andersen particle size optimization model while the remaining two have a finer and a coarser gradation. In the fresh state, mini slump, mini V-funnel and bleeding tests were applied, and rheological parameters were determined according to Bingham and modified Bingham models by using a rotational viscometer. In the hardened state, flexural strengths, mid-span deflections and numbers of microcracks formed under flexural loading were determined at 7 and 28 days. It was observed that the particle size optimization of the quartz sand can provide a balance between flow and bleeding characteristics of ECC mixtures. Although a reduction in flexural strength occurred at both ages in the optimized ECC mixture, the deflection capacity and the crack formation capacity under loading were significantly increased, reaching a deflection value of over 10 mm with at least 11 cracks formed during the test. As a result, it was revealed that particle size optimization can yield a mixture with the highest ductility without compromising the workability of ECC.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71305473","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

Comprehensive evaluation of transverse joint spacing in jointed plain concrete pavement 节理素面混凝土路面横缝间距综合评价

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.618

O. Kaya

引用次数: 0

Prediction of strength and shrinkage of ternary blended concrete with fly ash, slag and silica fume 粉煤灰、矿渣、硅灰三元掺合混凝土强度与收缩预测

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.669

T. Sakthivel, K. Arulraj

{"title":"Prediction of strength and shrinkage of ternary blended concrete with fly ash, slag and silica fume","authors":"T. Sakthivel, K. Arulraj","doi":"10.7764/rdlc.21.3.669","DOIUrl":"https://doi.org/10.7764/rdlc.21.3.669","url":null,"abstract":"In the recent years, there has been increased in concern on shrinkage response of concrete systems as abundant cases of premature deterioration were reported. The major factors affecting the deterioration of a concrete system are quality, composition and the surrounding environment. In connection with this, the work concentrates on the study of long-term effects on materials used in the concrete (supplementary cementitious materials SCMs) such as fly ash, slag and silica fume as a blended concrete system. To carry out the experimental work, nine concrete mixes were designed for varying proportions of SCMs and w/b. Evolution of compressive strength, elastic modulus, shrinkage and selected durability parameters were tested under a controlled laboratory condition. Based on the work, it was found that the inclusion of fly ash, slag and silica fume on the concrete systems enhance the compressive strength in long-term, also the shrinkage response of the ternary systems shows a substantial reduction in the measured strain. Durability performance like chloride penetration and sorptivity had a better performance in comparison with the conventional concrete systems.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71305661","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: 1

Mechanical performance of ETC RC beam with U-framed AFRP laminates under a static load condition 静载条件下u -框架AFRP层合板ETC RC梁的受力性能

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI: 10.7764/rdlc.21.3.678

P. Loganathan, R. Mohanraj, S. Senthilkumar, K. Yuvaraj

引用次数: 9