International Journal of Civil Infrastructure最新文献_第3页

Assessing the Effect of Coarse Aggregate Size on Self-Compacting Fibre Reinforced Concrete Mix 粗骨料粒径对自密实纤维混凝土配合比影响的评价

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2022.011

A. Mimoun, S. Kulasegaram

{"title":"Assessing the Effect of Coarse Aggregate Size on \u0000Self-Compacting Fibre Reinforced Concrete Mix","authors":"A. Mimoun, S. Kulasegaram","doi":"10.11159/ijci.2022.011","DOIUrl":"https://doi.org/10.11159/ijci.2022.011","url":null,"abstract":"- Steel fibres increase inhomogeneity and alter rheological and hardened characteristics of self-compacting concrete. To investigate the rheological behaviour and hardened characteristics of self-compacting concrete (SCC) and selfcompacting steel fibre reinforced concrete (SCSFRC), a wide range of normal strength self-compacting concrete mixes containing steel fibres and coarse aggregates (of size 10 mm, 20 mm) with target cube compressive strengths between 30 to 70 MPa were prepared in the laboratory. The plastic viscosity of these concrete mixes were estimated to be in the range between 20–50 Pa s , and the slump flow time t 500 of each mix was recorded to ensure that the flow and passing ability for workability of the mixes satisfy the recommended British and European standards. This work mainly focuses on the properties of fibre reinforced self-compacting concrete containing 0.5% and 1% (by volume fraction) steel fibres and the effect of coarse aggregates on their rheological behaviour and flow characteristics. The effect of steel fibre content on the strength of hardened concrete is also investigated. In addition, comparison of flow behaviour between SCC and SCSFRC is also presented. Unrestricted use, distribution, and reproduction in any medium are permitted, provided the original work is properly cited.","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"40 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129091479","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

Effect of Sand to Aggregate Ratio on the Properties of Self-Compacting High-Performance Concrete 砂料比对高性能自密实混凝土性能的影响

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2022.006

Abdullah Alshahrani, Tian-xiao Cui, S. Kulasegaram

{"title":"Effect of Sand to Aggregate Ratio on the Properties of \u0000Self-Compacting High-Performance Concrete","authors":"Abdullah Alshahrani, Tian-xiao Cui, S. Kulasegaram","doi":"10.11159/ijci.2022.006","DOIUrl":"https://doi.org/10.11159/ijci.2022.006","url":null,"abstract":"- Self-compacting high-performance concrete (SCHPC) combines the properties and advantages of self-compacting concrete and high-performance concrete in both fresh and hardened states. For the SCHPC mix design, sand to aggregate ratio is a crucial parameter and plays an important role in governing the properties of SCHPC mix. This paper presents the results of an experimental investigation on the flowability, passing ability and mechanical properties of SCHPC mixes for various sand to total aggregate (S/A) ratio and water to cementitious material (w/cm) ratio. Tests were conducted on specimens using four (w/cm) ratios: 0.26, 0.30, 0.35 and 0.40 and two (S/A) ratios: 48% and 53%. All the mixtures were tested using slump flow test, J-Ring test, and L-box test in the fresh state as well as compressive strength, splitting tensile strength, and unit weight in the hardened state. The test results revealed that a lower S/A ratio (0.48) enhanced the flowability whereas the higher S/A ratio (0.53) enhanced the passing ability. The lower S/A ratio (0.48), containing greater proportion of coarse aggregate, generally improved the mechanical properties of SCHPC compared to the mixes with the higher S/A ratio (0.53).","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122608192","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: 3

Effect of Corrosion Location and Transverse Reinforcement on Flexural-Ductile Response of Reinforced Concrete Beams 腐蚀位置和横向配筋对钢筋混凝土梁弯延性响应的影响

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2022.014

Safdar Naveed Amini, Aditya S. Rajput

引用次数: 0

Back Calculation of various Geomechanical Properties of Pare Rock Mass 岩体各种地质力学性质的反算

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2022.012

P. Singh, D. Goswami, R. Singh

{"title":"Back Calculation of various Geomechanical Properties of Pare Rock Mass","authors":"P. Singh, D. Goswami, R. Singh","doi":"10.11159/ijci.2022.012","DOIUrl":"https://doi.org/10.11159/ijci.2022.012","url":null,"abstract":"- With the interest of overcoming certain challenges like floods, shortage of electricity, drinking water, etc., river valley projects are taken which can serve the required purposes in the long run. Generally, the river valley projects which involve the construction of dam are situated in gorges where constructions are done through the rock masses. So, the specifications of the supports provided at the site can be utilized again for estimating the behaviour of the rock mass with the help of back calculation technique. Further, the determination of the properties of the rock mass at the site also aid in the assessment of stability, which can be done with the help of in-situ tests as well as laboratory tests. Since it is not feasible to conduct a large number of in-situ tests at site, one can find it advantageous to use the tools like Finite element codes like Plaxis 3D AE for determining the properties of the rock mass. In this research work, an attempt has been made to derive the properties of the rock mass by back calculation technique using the results of in-situ Plate load test. An appropriate material modelling is very important in any Finite Element analysis to arrive at solutions close to the exact values, necessitating the selection of appropriate constitutive model. In this context, the suitability of the four constitutive models viz. Jointed Rock mass model, Hoek-Brown model, Mohr-coulomb model and Hardening Soil model, appropriate to Pare Rock mass is examined. Through this study, a systematic approach has been adopted for the simulation of rock mass properties of the Pare Hydroelectric Project site with the help of numerical modelling. In addition to this, two different parameters viz. RMSE and MAPE values are computed to check the discrepancies among the field and the FEM values in the constitutive models for both loading and unloading conditions.","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115395121","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

A Finite Element Approach to Investigate the Deformation Behaviour in Deep Excavation for TBM Launching Shaft TBM发射井深基坑变形特性的有限元研究

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2023.005

Sultan Al Shafian, Md. Nafis Imtiyaz, Mostafiz Emtiaz

引用次数: 3

Development of Relative Rigidity Measure for Shallow Foundations 浅基础相对刚度测量方法的发展

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2023.003

S. Tabsh, Magdi Elemam

{"title":"Development of Relative Rigidity Measure for Shallow Foundations","authors":"S. Tabsh, Magdi Elemam","doi":"10.11159/ijci.2023.003","DOIUrl":"https://doi.org/10.11159/ijci.2023.003","url":null,"abstract":"- This study investigates the influence of the structure-to-soil relative rigidity on the structural behaviour of shallow foundation. The effect of change in the material and geometrical properties on the critical soil pressure intensity, bending moment and shear force of spread footings and rafts is investigated numerically using the finite element method. The parameters that are addressed in the analysis include the foundation thickness, soil modulus of subgrade reaction, concrete modulus of elasticity and plan geometry of the foundation. The foundation is modelled by thick shell elements while the soil by Winkler elastic springs. Findings of the study showed that the most important variables that affect the structural response of shallow foundations are the thickness and plan dimensions of the foundation, and to a lesser extent the soil modulus of subgrade reaction and concrete modulus of elasticity. A relative foundation-to-soil rigidity measure that can quantitatively predict the degree of stiffness of a shallow foundation was developed. The rigidity measure can help engineers in forecasting whether the traditional rigid foundation approach can be safely used to analyse a given spread footing or raft.","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116133989","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

Proof-of-Concept Laboratory-Scale Production of ‘Sand-like’ Material using Clayey Soil 使用粘性土壤的“沙状”材料的概念验证实验室规模生产

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2023.001

J. W. Koh, S. Subramanian, S. Chew, K. Low, Y. C. Tan, C. Teo, J. M. J. Lee, M. Y. Koh

引用次数: 0

Modelling the Effects of Soil Properties, Rainfall and Road Geometry to Erosion in Unpaved Roads 模拟土壤性质、降雨和道路几何形状对未铺设道路侵蚀的影响

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/IJCI.2021.015

Esdras Ngezahayo, G. Ghataora, Michael Burrow

{"title":"Modelling the Effects of Soil Properties, Rainfall and Road Geometry to Erosion in Unpaved Roads","authors":"Esdras Ngezahayo, G. Ghataora, Michael Burrow","doi":"10.11159/IJCI.2021.015","DOIUrl":"https://doi.org/10.11159/IJCI.2021.015","url":null,"abstract":"Erosion of soils seriously challenges the sustainability and safety in unpaved roads. It leads to faster deterioration of these roads by formation of rills and gullies in the running surface. Many factors related to the soil properties, rainfall parameters, and road geometry affect erodibility of soils at the surface of unpaved roads. However, little is known about the relationships between those factors of erodibility for a single rainfall event. This paper models the contributions of soil properties, intensity and duration of the rainfall, and road’s length and gradient to the quantity of eroded soils from unpaved roads. For a 30-minute duration and two consecutive days; rainfall intensities of 30 mm/hr, 51 mm/hr and 68 mm/hr were used to test the erodibility of soils. The tested bed surfaces were set at slopes of 0% and 6%, in a small (large)-scale testing box of 0.6 m (1.2 m) x 0.3 m x 0.17 m (length x width x height). RapidMiner Studio software was used to predict quantities of eroded soils based on the measured eroded soils under the same influencing factors of erodibility. Six predictive models were developed based on the firstand second-day rainfall events. The predictive models can perform well with the Nash and Sutcliffe’s coefficients of efficiency (ME) ranging from 0.62 to 0.74. Also, clay content and mean particle size of the surface soils, rainfall intensity and slope gradient were the most contributing factors to the quantity of eroded soils from unpaved roads.","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122228817","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: 1

Seismic Performance of Reinforced Concrete Shear Wall Buildings 钢筋混凝土剪力墙建筑抗震性能研究

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/IJCI.2021.003

S. A. Hossain, A. Bagchi

引用次数: 0

Bearing Capacity and Strength of Fibre-Reinforced Sand: Experimental and Parametric Study 纤维增强砂的承载力与强度:试验与参数化研究

International Journal of Civil Infrastructure Pub Date : 1900-01-01 DOI: 10.11159/ijci.2023.004

Ruba Elmootassem, Haitham A. Badrawi, Magdi Elemam, A. Amin

{"title":"Bearing Capacity and Strength of Fibre-Reinforced Sand: Experimental and Parametric Study","authors":"Ruba Elmootassem, Haitham A. Badrawi, Magdi Elemam, A. Amin","doi":"10.11159/ijci.2023.004","DOIUrl":"https://doi.org/10.11159/ijci.2023.004","url":null,"abstract":"- In this paper, Polyolefin fibre which is produced from simple olefin (CnH2n) was mixed with dry sand to investigate the shear strength improvement of the admixture. Specimens with 0.5%, 1%, 1.5% and 2% fibre contents with yarns lengths of 15 mm and 30 mm are prepared in repeatable steps and tested in direct shear tests. Bearing capacity of hypothetical footing resting on ground surface of the tested fibre-reinforced-sand was estimated using Terzaghi’s bearing capacity equation. Moreover, a parametric study includes thickness of reinforced layer, depth of foundation, and fibres content percent is conducted. In the parametric study, the continuous footing was analysed using procedures estimating the bearing capacity of layered soils. Results of shear strength tests indicated that, the inclusion of randomly distributed discrete fibres significantly improved the shear strength of sand. The optimum fibre percentage for improving both friction angle was about 1%. Adding fibre more than this ratio resulted in a significant reduction in soil shear strength parameters. The effect of fibre on sand apparent tensile cohesion is more pronounced compared to its effect on the friction angle. The parametric study indicates that having a continuous footing resting on a soil layer reinforced with 30 mm artificial fibres at 0.5% content provides the highest ultimate bearing capacity. Finally, the thickness of the reinforced layer and the depth of the foundation are among the parameters that affect bearing capacity.","PeriodicalId":371508,"journal":{"name":"International Journal of Civil Infrastructure","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121661792","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