Behavior of CFRP-confined recycled aggregate concrete under axial compression

Chen, G.M.; He, Yuding; Tao, Jianguo; Lin, Chaohui

doi:10.1016/j.conbuildmat.2016.01.054

Cited by 80 publications

(33 citation statements)

References 33 publications

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“…The value of θ (0.79 for a prism and 0.44 for a cylinder) is determined through linear fitting of the test data. Figure 13 shows that Equation (12) agrees well with the test results on the whole.…”

Section: Combined Peak Strainsupporting

confidence: 68%

“…Since then, research on recycled aggregate concrete (RAC) has become progressively more systematic. Mechanical properties, durability, and micro-characteristics of RAC have been experimentally investigated by 2 of 21 many scholars [6,[9][10][11][12][13][14][15][16][17][18]. New technologies have also been proposed to improve the quality of concrete filled with recycled aggregates in recent years [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Yong

Chen

2018

Applied Sciences

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Directly adopting coarsely crushed demolished concrete lumps (DCLs) with pouring concrete (referred to as fresh concrete, FC) in new structural members has been demonstrated to be more efficient and environmental than the traditional approach of recycling waste concrete as coarse aggregate particles. In this study, 45 prisms made of FC and DCLs were tested under axial compressive loading up to failure. The varied parameters included the dimensions of the prisms, the replacement ratio of DCLs, and the characteristic size of the lumps. The compressive performance of 36 cubes and cylinders was also experimentally examined for comparison. A formula was developed to predict the strength of compound concrete prisms filled with DCLs. Empirical formulas were also established relating a prism's strength with its elastic modulus and peak strain. It was found that: (a) when the replacement ratio is between 20% and 40%, the strength of a prism is about 1.13 that of a cylinder, due to the casting direction of the prism being different from that of the cylinder; (b) as the size of filler lumps increases relative to the size of the specimen, the strength of prisms decreases faster than that of cylinders, which weaken faster than cubes; and (c) due to the coupling effect of the aggregate size of FC and the specimen size, the compressive strength of prisms first increases with their size and then declines gradually.

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Section: Combined Peak Strainsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Yong

Chen

2018

Applied Sciences

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“…Previous experimental investigations [62][63][64][65][66][67][68][69][70][71][72][73][74][75] have clearly reported that the mechanical properties of both RAC and the members containing RAC are predominated by the characteristics of RCAs (RCA percentage, the water absorption and density of RCAs, crushing damage in RCAs, etc.). Based on the water absorption capacity of RCAs, Xu et al [64] suggested the underlying mechanism of strength reduction or enhancement of RAC manufactured with the AWM and ETWM mixing methods.…”

Section: Influences Of R and Of The Addition Water Methodsmentioning

confidence: 99%

“…Based on the water absorption capacity of RCAs, Xu et al [64] suggested the underlying mechanism of strength reduction or enhancement of RAC manufactured with the AWM and ETWM mixing methods. Figure 6 illustrates the principle of strength variations on RAC determined by the two manufacturing methodologies: the AWM (i.e., [62,63,66]) and ETWM (i.e., [69][70][71][72] equivalent effective water method and the equivalent total water method based on the way the method affects the relationship between the strengths of NAC and RAC ( Figure 6). In the present modeling, the RAC material properties were adopted from Xiao et al [56] (in the case of the AWM) and Chen et al [73] (the ETWM).…”

Section: Influences Of R and Of The Addition Water Methodsmentioning

confidence: 99%

Performance Evaluation of Reinforced Recycled Aggregate Concrete Columns under Cyclic Loadings

et al. 2019

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Recycled concrete aggregates (RCAs) generated from construction and demolition activities have been recognized as a feasible alternative to natural aggregates (NAs). Naturally, the columns fabricated with reinforced recycled concrete (RRC) have been proposed and investigated to promote the structural use of recycled aggregate concrete (RAC). There is still, however, very limited modeling research available to reproduce, accurately and efficiently, the seismic response of RRC columns under lateral cyclic loading; proper evaluations are also lacking on addressing the columns’ seismic behaviors. To fill some of those research gaps, a fiber-based numerical model is developed in this study and then validated with the experimental results published in the literature. Subsequently, the numerical model justified is applied to carry out a comprehensive parametric study to examine the effects of a range of variables on the hysteretic characteristics of RRC columns. Furthermore, a grey relational analysis is conducted to establish quantifiable evidence of key variable sensitivities. The evaluation results imply that the use of the additional water method (AWM) for manufacturing RAC is likely to reduce the lateral load-carrying capacity of the RRC columns (up to 10%), whereas the opposite would occur if a conventional mixing procedure is adopted. Moreover, compared with other factors such as steel area ratio, the content of RCA replacement has a less remarkable effect on the seismic performance of the RRC columns. In general, the RRC columns possess acceptable seismic-resistant properties, and they can be used in earthquake-prone regions with confidence.

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“…The resulting column of this strengthening technique is referred to as a fully FRP-confined concrete column. Existing research has demonstrated that the compressive strength and ductility of circular columns fully wrapped with FRP jackets are substantially enhanced [1,2,3,4,5,6,7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Behavior and Three-Dimensional Finite Element Modeling of Circular Concrete Columns Partially Wrapped with FRP Strips

2018

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Fiber-reinforced polymer (FRP) jacketing/wrapping has become an attractive strengthening technique for concrete columns. Wrapping an existing concrete column with continuous FRP jackets with the fiber in the jacket being oriented in the hoop direction is referred to as FRP full wrapping strengthening technique. In practice, however, strengthening concrete columns with vertically discontinuous FRP strips is also favored and this technique is referred to as FRP partial wrapping strengthening technique. Existing research has demonstrated that FRP partial wrapping strengthening technique is a promising and economical alternative to the FRP full wrapping strengthening technique. Although extensive experimental investigations have hitherto been conducted on partially FRP-confined concrete columns, the confinement mechanics of confined concrete in partially FRP-confined circular columns remains unclear. In this paper, an experimental program consisting of fifteen column specimens was conducted and the test results were presented. A reliable three-dimensional (3D) finite element (FE) approach for modeling of partially FRP-confined circular columns was established. In the proposed FE approach, an accurate plastic-damage model for concrete under multiaxial compression is employed. The accuracy of the proposed FE approach was verified by comparisons between the numerical results and the test results. Numerical results from the verified FE approach were then presented to gain an improved understanding of the behavior of confined concrete in partially FRP-confined concrete columns.

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Behavior of CFRP-confined recycled aggregate concrete under axial compression

Cited by 80 publications

References 33 publications

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Performance Evaluation of Reinforced Recycled Aggregate Concrete Columns under Cyclic Loadings

Behavior and Three-Dimensional Finite Element Modeling of Circular Concrete Columns Partially Wrapped with FRP Strips

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