Shear strength of reinforced-recycled material

Touahamia, M.; Sivakumar, V.; McKelvey, David

doi:10.1016/s0950-0618(02)00029-6

Cited by 31 publications

(12 citation statements)

References 3 publications

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“…The RA was separated from the cement matrix through multiple crushing stages and loose fine particles were washed off the surface of the RA to minimise the deleterious effect of the fines (Touahamia et al, 2002). The resulting coarse RA contains little adhered old mortar and has similar physical properties to those of the NA as shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Early experimental studies consistently indicated a reduction in compressive strength www.concrete-research.com 1751-763X (Online) 0024-9831 (Print) # 2010 Thomas Telford Ltd of as much as 30%-35% when all the coarse aggregate was replaced with RCA (Rasheeduzzafar, 1984;Ravindrarajah and Tam, 1985;Ajdukiewicz and Kliszczewicz, 2002;Touahamia et al, 2002;Etxeberria et al, 2007). These observations are consistent with microscopic examination of the new mortar-RA interface, which confirmed that the interfacial zone is less dense than that of natural aggregate, and the old interface between the adhered mortar and the old aggregate acts as a weak link inside RAC rather than the new interfaces when RA was produced from aged lowstrength concrete (Poon et al, 2004;Etxeberria et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Experimental studies have been carried out to investigate the effects of RA on the flexural and shear behaviour of concrete beams; they revealed no significant difference in the behaviour or strength because of the RA (Yagishita et al, 1993;González-Fonteboa and Martínez-Abella, 2007). On the other hand, direct shear tests of recycled aggregate showed lower shear strength than that of freshly quarried rocks, indicating the RA may have less effective aggregate interlocking mechanisms (Touahamia et al, 2002). A similar trend was also observed in flexural beams as the recycled aggregate replacement ratio increased .…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the shear strength of recycled aggregate concrete beams

Choi¹,

Yi²,

Cho³

et al. 2010

Magazine of Concrete Research

108

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In concrete beam design, the shear capacity of the concrete beam is of great interest because shear failure is associated with an abrupt failure mode that undermines the flexural performance of the beam. Recently, because of the increasing cost of natural resources and environmental concerns, the use of recycled aggregate (RA) in construction is becoming the standard practice. However, the effects of recycled aggregates on the shear strength of concrete have not been fully examined. In this study the effects of RA on concrete shear strength are studied experimentally by performing flexural tests on 20 RA concrete beams with various combinations of span-to-depth ratios (a/d ¼ 1 . 50, 2 . 50, 3 . 25), longitudinal reinforcement ratios (s ¼ 0 . 53%, 0 . 83%, 1 . 61%) and RA replacement ratios (0%, 30%, 50%, 100%). The test results indicate that the concrete shear strength diminishes by up to 30% at 100% replacement ratio compared with the natural aggregate concrete. The shear strengths of the RA concrete beams are also compared with those obtained from the existing models for natural aggregate concrete and some design considerations in using the recycled aggregate concrete are discussed. NotationA b section area of beam (m 2 ) A s steel rebars area (mm 2 ) a/d shear span-to-depth ratio b w , h, d width, depth and effective depth of beam (mm) E c elastic modulus (GPa) E s modulus of elasticity of rebars (GPa) f ck specified concrete compressive strength (MPa) f su specified tension strength of rebar (MPa) f y specified yield strength of rebar (MPa) P c early transverse tension crack load (kN) P cr initial critical shear crack load (kN) P cu ultimate shear load (kN) V cr shearing strength in early shear crack (kN) V u ultimate shearing strength (kN) r principal rebar ratio r/r b relative rebar ratio

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on the shear strength of recycled aggregate concrete beams

Choi¹,

Yi²,

Cho³

et al. 2010

Magazine of Concrete Research

108

View full text Add to dashboard Cite

show abstract

“…According to research by Vieira and Pereira [29], construction waste mixtures are mainly composed of bricks and concrete, and the mechanical properties of construction waste show low variability. Touahamia et al [30] carried out direct shear tests on the recycled waste materials, and the results show that the shear strength of the waste materials can be significantly improved by crushed concrete. If the crushed concrete in construction waste is reused as a curing agent, it can not only improve the mechanical properties of the soil, but also realize the recycling of construction waste, resource saving, and environmental protection [31,32].…”

Section: Introductionmentioning

confidence: 99%

Triaxial Shear Test on Hydrochloric Acid-Contaminated Clay Treated by Lime, Crushed Concrete, and Super Absorbent Polymer

Fang

2019

Advances in Materials Science and Engineering

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Acid pollution weakens the bearing capacity of subgrade, and discarded concrete occupies land. The mechanical properties of hydrochloric acid-contaminated clay were investigated by triaxial consolidation undrained tests. Also, the theory of diffusion double electric layer was employed to explain the change principle of cohesion and compression characteristics of hydrochloric acid-contaminated clay. In addtion, the curing effects of lime, crushed concrete, and SAP on the shear strength of hydrochloric acid-contaminated clay were compared. The triaxial test results show that cohesion decreased with the increase of hydrochloric acid concentration. The internal friction angle firstly increased and then decreased, and the change of internal friction angle was less affected by acid concentration. The curing effect of crushed concrete was similar to that of lime, which was better than lime. SAP could only improve the cohesion of the hydrochloric acid-contaminated clay; the internal friction angle decreased significantly; the three kinds of curing materials could significantly improve the cohesion of acid-contaminated clay to be higher than the natural clay, improving the shear strength to a certain extent. Additionally, the theory analysis illustrated that due to the change in the thickness of the diffusion layer between the clay particles, the van der Waals force between the particles changed, and the colloidal formation of the micelles led to changes in cohesion. The study can provide references to the treatment of contaminated soil in engineering practice.

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“…Pullout tests method commonly performed in accordance with ASTM D6706 [14] to provide the design parameters, which can be used in the design of geosynthetic-reinforced retaining walls, slopes, and embankments or in other applications where resistance of a geosynthetic to pullout under simulated field condition is important. Thus, a safe and economic design of soil reinforcement requires a good understanding of interaction mechanisms that develop between the soil and the reinforcement [15][16][17]. The interactions can be simplified as soil sliding in direct shear over the reinforcement and pullout of reinforcement from the soil [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Interface Behaviour of Different Types of Granular Soil/Geosynthetics

Choudhary

Krishna

2016

Int. J. of Geosynth. and Ground Eng.

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In this paper, influence of different types of soils and geosynthetics on soil/geosynthetics interface behaviouris investigated by direct shear and pullout tests. Three different types of cohesionless soils and three different types of geosynthetics materials are adopted for experimental investigation. A series of large direct shear tests and pullout tests were conducted to investigate the interface behaviour of soil/geosynthetics. The test equipment, soils, and geosynthetics properties are described. The influence of soil particle size (D 50 ) and geosynthetic structure are discussed by analysing tests results. Results are presented and discussed in terms of peak shear resistance, peak pullout resistance, interface friction angle, efficiency factors and interaction coefficient for different soils and geosynthetics. It could be seen that the interface friction angle from both direct shear and pullout tests linearly increases with increase in (D 50 ) of soil. The pullout interaction coefficients (C i ) are found to be in the range of 0.62-1.72 for different tests conditions.

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Shear strength of reinforced-recycled material

Cited by 31 publications

References 3 publications

Experimental study on the shear strength of recycled aggregate concrete beams

Experimental study on the shear strength of recycled aggregate concrete beams

Triaxial Shear Test on Hydrochloric Acid-Contaminated Clay Treated by Lime, Crushed Concrete, and Super Absorbent Polymer

Experimental Investigation of Interface Behaviour of Different Types of Granular Soil/Geosynthetics

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