Aims and Scope
Recent Articles
Influence of Heterogeneity, Typology, and Contaminants of Recycled Aggregates on the Properties of Concrete
Gilberto A. da Silva Neto, João P. V. de Oliveira, Pedro V. Salles, Raphael T. de Vasconcelos Barros, Maria T. Paulino, White J. dos Santos
Background:
The depletion of raw material resources, the preservation of the environment, and the need to compensate economic imbalances drive research efforts regarding the application of Construction and Demolition Waste (CDW) in concretes.
Objective:
This paper aimed to assess the influence of the heterogeneity, typology, and presence of contaminants of CDW (collected in different seasons and locations) on the mechanical properties and durability of concretes.
Methods:
Characterization procedures were performed for the aggregates (visual quantification and physical properties of the constituents), and for the concretes (compressive strength, splitting tensile strength test, modulus of elasticity, water absorption, porosity, electrical resistivity, carbonation depth, and digital microscopy). The replacement rate of natural aggregate for CDWA was of 20% in three different particle sizes: sand, gravel 0, and gravel 1.
Results:
The characteristics of the samples of CDW were very variable, influenced by the season and location of collection. The presence of materials with elevated porosity (ceramics, mortars) was observed in some samples and required increases in mixing water volume to keep the concretes’ consistency. A wide variation in mechanical properties caused by the CDWA constituents was also observed. Regarding the durability of the concretes, it was proven the greatest sensibility of this property to contaminants, thus requiring the removal of deleterious materials to using CDWA in structural concretes in order to avoid the formation of vesicles and guaranteeing their life span.
Conclusion:
The heterogeneity, typology and contaminant content significantly influence the analyzed properties. Besides, the segregation of waste at source makes the use of CDWA feasible in concretes.
December 31, 2020
Articles
- December 21, 2020
Numerical Investigation of Innovative Support Frame of Openings in the Segmental Tunnel Lining
November 27, 2020Current Opportunities and Challenges in the Incorporation of the LCA Method in BIM
October 08, 2020Numerical Simulation and Experimental Investigation on Seismic Performance of Composite Structural Connection of Encased CFST Column and Reinforced Concrete Beam with Steel Ring
August 24, 2020Clogging Potential of Earth-Pressure Balance Shield Driven Tunnels
August 19, 2020Corrosion Effect of Rice Husk Ash in Concrete Pore Solution: Response Surface Analysis
June 29, 2020Stability Analysis of Dike to Impound Freshwater in Brackish Water Estuarine Environment
Editor's Choice
Investigation of Uplift Capacity of Deep Foundation in Various Geometry Conditions
Danial Jahed Armaghani, Houman Sohaei, Eshagh Namazi, Aminaton Marto
Background:
Uplift resistance of deep foundations or piles is a critical factor for deep foundation design in several civil engineering applications such as electric transmission towers, communication towers and wind power generators. Therefore, the behavior of the pile under uplift load, together with its influential parameters, should be studied to provide a proper design.
Objective:
The aim of this study was to identify the effects of pile geometry, including diameter and embedment depth on the Maximum Uplift Resistance (MUR) of the small-scale piles.
Methods:
To achieve the aims of this study, a total of nine laboratory experiments having various pile diameters (i.e. 9 mm, 12 mm and 15 mm) and embedment depths (i.e., 10 cm, 15 cm and 20 cm) were planned, designed and conducted.
Results:
Generally, the results indicated that both diameter and embedment depth have a significant effect on the MUR of piles. The values of the MUR of piles were increased by increasing the pile diameters in all conducted tests. Furthermore, a significant increase in the MUR results was observed when the embedment depths are increased from 10 cm to 20 cm. Moreover, in all cases, small-scale piles were failed in embedment depths ranging from 5 mm to 10 mm.
Conclusion:
It was concluded that pile geometry has a deep impact on the MUR of the piles. Future research can be done to investigate the effects of other influential factors on the MUR.
December 31, 2019
Other Post
- August 30, 2019
Development of an Artificial Intelligence Approach for Prediction of Consolidation Coefficient of Soft Soil: A Sensitivity Analysis
March 28, 2019An Enhanced Beam Model for the Analysis of Masonry Walls
August 30, 2019The Behavior of Concrete-Filled Single and Double-Skin uPVC Tubular Columns Under Axial Compression Loads
January 31, 2019Seismic Assessment of Steel MRFs by Cyclic Pushover Analysis
November 23, 2018Empirical Model Of Unreinforced Beam-column RC Joints With Plain Bars
November 30, 2017Influence of Fineness of Recycled Glass Waste and Slag on Compressive Strength of Sulphate Resisting Cement Mortars