Reinforced Recycled Aggregate Concrete Research Articles

Bond properties between corroded steel bars and recycled aggregate concrete after high-temperature exposure

Increasingly used reinforced recycled aggregate concrete (RAC) structures may suffer from steel corrosion and high-temperature exposure. The bond behaviors between corroded steel bars and RAC after high-temperature exposure are important in the high-temperature/fire damage assessment of aging RAC structures. In this study, pull-out tests were carried out on specimens of corroded steel and natural aggregate concrete (NAC) or RAC after high-temperature exposure. The specimens were exposed to 20, 100, 200, 300, 400, 500, 600, 700 and 800 °C with steel bar in the specimens corroded with corrosion ratios of 0.00 %, 1.05 %, 3.07 %, 5.34 %, 7.50 %. The failure modes, bond-slip curves and bond strength were studied. Effects of corrosion/temperature on bond strength and their difference when using different aggregates (RAC and NAC) were analyzed. The test results indicated that the bond strength of most specimens decreased with increasing high-temperature exposure, and the bond strength degradation of NAC was slightly higher than that of RAC. The bond strength first increased and then decreased as the corrosion ratio increased, and the bond strength of NAC is higher than that of RAC under high corrosion conditions. The failure modes and bond strength also varied with and without stirrups. A bond-slip constitutive model of corroded steel bar and RAC without stirrups after high temperature was established introducing temperature and corrosion influence coefficients.

Seismic Performance of the Corroded Reinforced Recycled Aggregate Concrete Columns

Seismic Performance of the Corroded Reinforced Recycled Aggregate Concrete Columns

Bond-slip Behaviour of NSM GFRP Bars in Reinforced Recycled-Aggregate Concrete: Experiments and a Modified Model

Bond-slip behaviour of glass fiber-reinforced polymer (GFRP) bars embedded in conventional concrete has been widely investigated. In contrast, the bond-slip behaviour of near-surface mounted (NSM) GFRP bars bonded in reinforced recycled aggregate concrete (RAC) seems to be less explored, while recycled materials have been increasingly used due to reasons of environmental pollution and resource exhaustion. This study aimed to experimentally and theoretically examine the bond-slip behaviour of NSM GFRP bars in reinforced RAC under monotonic and cyclic loadings. To achieve this aim, twenty-four tests were performed, which were divided into two groups by monotonic and cyclic loadings. In each group, twelve tests were performed on ten reinforced RAC specimens and two reinforced normal aggregate concrete (NAC) specimens. The test results confirmed the brittle shear failure of concrete in the proximity of a resin-concrete surface. Bond-slip behaviour can be characterized by nonlinear and linear branches, in which the linear branch dominates the behaviour. Under monotonic and cyclic loadings, the average slips of GFRP bars in reinforced RAC were 0.238 and 0.284 mm, and their coefficients of variation (COV) were relatively large at 0.142 and 0.130, respectively. In contrast, ultimate loads had a relatively low COV of around 0.038. The effect of cyclic loading significantly increased the ultimate slip by 19.3%, whereas it negligibly reduced the ultimate load; consequently, the stiffness was reduced by 19.4%. A modified smooth model was proposed to predict the bond-slip behaviour of NSM GFRP bars in reinforced RAC under monotonic and cyclic loadings. The simplicity and accuracy of the model can be useful for engineers in structural retrofitting using NSM FRP technique. Doi: 10.28991/CEJ-2023-09-02-01 Full Text: PDF

A restoring force model for frames with steel tube columns filled with recycled aggregate concrete

AbstractTo establish a restoring force model for recycled aggregate concrete‐filled steel tube (RACFST) frames, the quasistatic tests on two frames comprising two RACFST columns and a reinforced recycled aggregate concrete (RRAC) beam each was carried out. The recycled coarse aggregate replacement ratio was 100%. The failure mechanism, hysteretic curves, and strain response of the specimens were discussed. By analyzing the degradation of the load bearing capacity with increasing displacement amplitude and combining the hysteretic curves and stiffness degradation relationships, a restoring force model of load versus displacement adopting a trilinear approximation was proposed. The characteristic points of the model were the relative yield point, relative peak point, and relative failure point. Results showed that bending‐shear or bending failure occurred at the ends of specimen beams and plastic hinges formed there earlier than at the column ends. The hysteretic curves of load versus displacement were essentially symmetric in a full shuttle shape. The proposed restoring force model adopting trilinear approximation agreed well with the experimental hysteretic curves under low‐cycle loading and can thus be recommended to perform the elastoplastic analysis of seismic response for this new type of composite structures.

Experimental Study and Finite Element Analysis on the Flexural Behavior of Steel Fiber Reinforced Recycled Aggregate Concrete Beams.

This paper reports on the flexural behavior of nine steel fiber reinforced-recycled aggregate concrete (SFRAC) beams through combined experimental and finite element analysis. The test parameters in this study include the steel fiber volume fraction, recycled aggregate replacement ratio, and concrete strength. The failure modes, crack development, load-deflection curves, and flexural bearing capacity of SFRAC beams are investigated in detail. The test results indicated that cracks and concrete crushing are formed in the compression zone of all specimens. The flexural bearing capacity of SFRAC beams increases with the increase of steel fiber volume fraction and concrete strength and the decrease of recycled aggregate replacement ratio. In addition, the results are compared with those of the finite element analysis. Based on the uniaxial compressive constitutive model of SFRAC, a new model for calculating the flexural bearing capacity of SFRAC beams is proposed. The prediction and test results are compared to evaluate the accuracy of the developed formula. The studies may provide a considerable reference for designing this type of structure in engineering practice.

Characteristics of Basalt Macro-Fiber Reinforced Recycled Aggregate Concrete

This study aims to examine the impact of using basalt macro-fibers (BMF) on characteristics of concrete made with recycled concrete aggregates (RCA). Test variables included the initial concrete grade (normal- and high-strength concrete (NSC and HSC)), RCA replacement percentage (30 and 60%), and BMF volume fraction (νf = 0.5 to 1.5%). The compressive strength reduction in the plain concrete caused by RCA was sensitive to the RCA replacement percentage rather than the initial concrete grade. The splitting and flexural strength reductions of the plain HSC caused by RCA were more significant than those of their NSC counterparts. The use of BMF compromised the concrete workability. Such a detrimental effect increased with the BMF content and was more pronounced for the HSC with 60% RCA. Reinforcing of RCA-based concrete with BMF tended to improve the mechanical properties. In some instances, the use of BMF at νf > 1% caused a decay in the strength gain. The addition of BMF to RCA-based concrete had a potential to fully restore the original splitting and flexural strengths of plain concrete mixtures made with natural aggregates (NA). The increase in the compressive strength of the RCA-based concrete caused by BMF was, however, not sufficient to fully restore the original strength of the NA-based plain concrete. The resistances to water penetration and abrasion of the RCA-based concrete improved by up to 17% and 47%, respectively, due to the addition of BMF. Idealized tensile softening laws were established for RCA-based concrete reinforced with BMF.

Eccentric compression behavior of reinforced recycled aggregate concrete columns after exposure to elevated temperatures: Experimental and numerical study

As the thermal performance of recycled aggregate concrete (RAC) is different from that of natural aggregate concrete (NAC), the mechanical properties of reinforced recycled aggregate concrete (RRAC) members after exposure to elevated temperature have been attracted great interest. However, there are little literatures about the eccentric compression behavior of the RRAC column after exposure to elevated temperature. This paper presents experimental and numerical studies on the eccentric compression behavior of RRAC columns after exposure to elevated temperatures. In this research, nine specimens were tested to study the effects of the recycled coarse aggregate (RCA) replacement percentage, elevated temperature and eccentricity ratio on eccentric compression behavior. The results showed that the temperature was the primary factor influencing the eccentric compression behavior, followed by eccentricity ratio, while RCA replacement percentage had the least effect. As temperature increased or eccentricity ratio decreased, the failure mode of eccentric columns changed from tension-controlled to compression-controlled, while the RCA replacement percentage had a little influence on it. The eccentric load bearing capacity decreased as the temperature and eccentricity ratio increased or RCA replacement percentage decreased. The parametric analysis of finite element (FE) model indicated that there was a coupling effect between design parameters of slenderness ratio, eccentricity ratio and longitudinal reinforcement ratio with temperature on the eccentric load bearing capacity. Based on the ABAQUS, the cross-sectional thermal field of RRAC columns was simulated. An equivalent model for the residual bearing capacity of RRAC columns was presented and agreed well with the results of experiment and simulation.

Long-Term Flexural Behaviour of Cracked Reinforced Concrete Beams with Recycled Aggregate

This paper presents the results of an investigation into the long-term flexural behaviour of cracked reinforced recycled aggregate concrete (RAC) beams. Washed construction and demolition wastes (CDW) with a maximum size of 20 mm were used as the coarse recycled aggregate. The main variable in the research was the replacement ratio of recycled aggregate. Specimens with 0%, 50% and 100% recycled aggregate were cast and tested. The experimental results showed that samples with an increased amount of recycled aggregate had significantly reduced strength and a noticeable increase in both short-term and long-term deflection of RAC beams over equivalent normal concrete (NC) beams. Increased levels of RA resulted in greater creep and shrinkage of RAC and greater long-term loss of tension stiffening in RAC reinforced tension specimens. Prediction of long-term deflections using Eurocode 2, even after incorporating the experimental concrete properties within the Code method, underestimated the experimental deflections of the RAC beams. However, by modifying the tension stiffening factor, β used in Eurocode 2, deflections were predicted to within approximately 1%. From this investigation, it is recommended that the factor β be reduced from 0.5 (for NC) to 0.4 (for RAC @50% replacement) and 0.3 (for RAC @100% replacement).

Shear behavior of reinforced recycled aggregate concrete beams after exposure to temperatures up to 600 °C

This study aims to investigate the shear behavior of reinforced recycled aggregate concrete (RRAC) beams after exposure to elevated temperatures. A total of sixteen 1/3-scale RRAC beams with the shear span-to-depth ratio of 1.2 were tested using the four-point bending facility. The method of equivalent total water was employed to manufacture the RAC. Four recycled coarse aggregate (RCA) replacement ratios (i.e., 0, 30%, 70% and 100%) and three elevated temperatures (i.e., 200 °C, 400 °C and 600 °C) were considered to examine their effects on the shear behavior of RRAC beams. The test results indicate that increasing of the elevated temperatures leads to the change of concrete color from smoky-gray to grayish-reddish and results in reducing the shear performance (i.e., load bearing capacity and initial stiffness) of RRAC beams. The shear damage and mechanism of RRAC beams were similar to those of reinforced natural aggregate concrete (RNAC) beams at the same elevated temperatures. A finite element method developed based on ABAQUS was used to simulate the thermal and shear behavior of RRAC beams. The parametric analysis was then conducted to investigate the effect of transverse reinforcement spacing and shear span-to-depth ratio on the shear behavior of the beam. Six design provisions including GB 50010, ACI 318, Europe 2, BS 8110, AS 3600 and JSCE 15 were employed to evaluate the residual shear capacity of RRAC beams. The evaluation results indicate that the existing provisions derived from RNAC underestimate the residual shear capacity of RRAC beams within the temperature equal to 500 °C.

Mechanical and durable properties of chopped basalt fiber reinforced recycled aggregate concrete and the mathematical modeling

Herein, the study conducts an experimental research on the mechanical strength and durability of chopped basalt fiber (BF) reinforced recycled aggregate (RA) concrete. BF at six volumetric dosages of 0, 0.25, 0.5, 0.75, 1 and 1.5% and RA at five volumetric substitution levels of 0, 25, 50, 75 and 100% are used in determining the compressive strength, the splitting tensile strength, the specific strength [ratio of splitting tensile strength and apparent density] and the chloride penetration. Results show that BF reinforces both RA and nature aggregate (NA) concrete in a dosage dependent way. Relative to the late strength, BF has a better reinforcement effect on the early strength of RA concrete. BF content though is positively related to the splitting tensile strength is with a declined marginal utility. The opitmal dosage thereby exists and is identifed as 1%. Given the reinforcement of BF and the lower density of RA, the combined use of BF at low dosage and RA in high content results in a specific strength that is higher than that of RA concrete. Besides the strength enhancement effect, BF also descends the porosity and ascends the resistance to chloride penetration of RA concrete. The respond surface methodology interestingly is found to have a prominent role in establishing a mathematical model between the compressive and the splitting tensile strength because both strengths have respond surfaces that are shaped by BF and RA. Aforementioned results verify inferior properties of RA concrete can be offset by BF addition, signifying a complementary effect between BF and RA.

Experimental study on bond behaviour between recycled aggregate concrete and basalt fibre-reinforced polymer bars under different strain rates

Concrete structures are constantly subjected to both static and dynamic loads. Hence, this study mainly focused on the strain rate effect on the bond behaviour between reinforced recycled aggregate concrete (RAC) and basalt fibre-reinforced polymer (BFRP) bars. Pull-out tests were conducted to investigate the bond performance between RAC and BFRP bars. The strain rates which indicate the static, earthquake, and impact loads were considered to investigate the strain rate effect on the bond behaviour. The bond mechanism was analysed according to the bond interface damage and bond stress–slip relationship. Furthermore, the bond stiffness, bond strength, and bond slip were examined. It is found that BFRP bars with different surface shapes induced different bond mechanisms. Although the high strain rate effect improved the bond behaviour, it changed the bond mechanism. Dynamic influence factors reflecting the strain rate effect were developed, and the corresponding formulae were proposed. It was confirmed that the proposed formulae can accurately predict the bond behaviour under different strain rates. Finally, a theoretical model that can simulate the dynamic bond behaviour between concrete and BFRP bars was proposed. The achievements of this study can provide reference for the dynamic bond design of BFRP bar-reinforced RAC structures.

Investigation of FRP-reinforced recycled concrete compressive members: Experimental and theoretical analysis

This study aims to investigate the structural performance of glass fiber reinforced polymer (GFRP) reinforced recycled aggregate concrete (RAC) columns (GFRAC columns) under different loading conditions. The structural performance of GFRAC columns is compared with steel rebars reinforced recycled aggregate concrete columns (STRAC columns). Eighteen samples with geometric measurements of 250 mm and 1150 mm for diameter and height, correspondingly, were fabricated including nine samples with GFRP rebars and hoops and nine samples with steel rebars and hoops. The results depicted that the average axial load-carrying capacity of GFRAC columns was 7.8% lesser than that of STRAC columns. The GFRAC columns presented larger deformation capacity indices. Both GFRAC and STRAC columns depicted similar damage behavior and portrayed substantial lessening in the axial load-carrying capacity because of the eccentric loadings. An analytical model for calculating the axial load-carrying capacity of GFRAC columns was proposed based on a large experimental database of GFRP reinforced samples. A close correlation was detected between the testing outcomes and the theoretical estimates for GFRAC columns, which solidly substantiates the accuracy of the proposed model.

Experimental and Theoretical Study on the Flexural Behavior of Recycled Concrete Beams Reinforced with GFRP Bars

This paper experimentally investigated the flexural behavior of reinforced recycled aggregate concrete (RAC) beams reinforced with glass fiber-reinforced polymer (GFRP) bars. A total of twelve beams were built and tested up to failure under four-point bending. The main parameters were reinforcement ratio (0.38%, 0.60%, and 1.17%), recycled aggregate replacement ratio (R = 0, 50%, and 100%) and longitudinal reinforcement types (GFRP and steel). The flexural capacity, failure modes, flexibility deformation, reinforcement strains and crack distribution of the tested beams were investigated and compared with the calculation models of American code ACI 440.1-R-15, Canadian code CSA S806-12 and ISIS-M03-07. The tested results indicated that the reinforcement ratio has great influence on the ultimate load, crack width and deflection of GFRP-RAC beams, the recycled aggregate replacement ratio has little influence on it. However, it was found that the reinforcement ratio has no obvious influence on the cracking load which was only related to the recycled aggregate replacement ratio. The average cracking load decreased by 5% and 15% as the recycled aggregate replacement ratio increased from 0 to 50% and 100%. For the steel-RAC beams, the ultimate load was found to be about 1/2 of the ultimate load of GFRP-RAC beam under the same condition and the trend of strain, deflection and crack width were different from GFRP-RAC beams. This is due to the different material properties of GFRP bars and steel rebar. On the other hand, the calculation results showed that ACI 440.1-R-15 and CSA S806-12 underestimated the ultimate load of GFRP-RAC beams. Moreover, the deflection prediction of GFRP-RAC beams by CSA S806-12 is relatively accurate compared with ACI 440.1-R-15 and ISIS-M03-07. As for the prediction of crack width, the results of ACI 440.1-R-15 prediction were in good agreement with the experimental results at the ultimate load, with the average value of 1.09 ± 0.28.

Residual behavior of recycled aggregate concrete beam and column after elevated temperatures

This paper presents the results of an experimental study on the residual behavior of reinforced recycled aggregate concrete (RRAC) beam-columns after exposure to elevated temperatures. Two parameters were considered in this test: (a) recycled coarse aggregate (RCA) replacement percentages (i.e. 0, 30, 50, 70 and 100%); (b) high temperatures (i.e. 20, 200, 400, 600, and 800℃). A total of 25 RRAC short columns and 32 RRAC beams were conducted and subjected to different high temperatures for 1 h. After cooling down to ambient temperature, the following basic physical and mechanical properties were then tested and discussed: (a) surface change and mass loss ratio; (b) strength of recycled aggregate concrete (RAC) and steel subjected to elevated temperatures; (c) bearing capacity of beam-columns; (d) load-deformation curve. According to the test results, the law of performance degradation of RRAC beam-columns after exposure to high temperatures is analyzed. Finally, introducing the influence coefficient of RCA replacement percentage and high temperatures, respectively, to correct the calculation formulas of bearing capacity of beam-columns in Chinese Standard, and then the residual bearing capacity of RRAC beam-columns subjected elevated temperatures is calculated according to the modified formulas, the calculated results are in good agreement with the experimental results.

Reinforced Concrete Slabs Containing Recycled Concrete as Coarse Aggregate

This research presents an experimental study on the performance of reinforced recycled aggregate concrete (RAC) that contains one of two types of recycled coarse aggregate, one from normal concrete and another from self – compacting concrete (SCC). The replacement percentages (by weight) of natural coarse aggregate with the recycled coarse aggregate are (0, 33.3, 66.7 & 100) % by weight. Moreover, Silica Fume was used as an admixture for all (RAC) mixtures. Concrete compressive strength, split tensile strength, and flexural strengths were studied for all of the reference and (RAC) mixtures at (28) days age, by testing concrete cubes, cylinders and reinforced concrete slabs specimens respectively. The results showed that the using of recycled waste concrete as concrete as aggregate will largely decreasing the slabs flexure strength while using of recycled (SCC) mixtures have relatively small effect in reducing the slabs flexure strength. The adding of silica fume to the concrete mix will increasing the slabs flexural strength and that increase is larger for recycled (SCC) aggregate mixtures than the recycled concrete aggregate mixtures. The results also indicate that the compressive strength and tensile strength are decreased by different ratio when using of recycled waste concrete as aggregate, while using of recycled (SCC) aggregate will also reduce the tensile strength and the modulus of rupture while the compressive strength increased when using this type of recycled aggregate. On the other hand, the mixtures with the Silica Fume showed a significant enhancement in the mechanical properties compared to those without the Silica Fume.

Study of Mechanical Properties of an Eco-Friendly Concrete Containing Recycled Carbon Fiber Reinforced Polymer and Recycled Aggregate.

This study investigates the feasibility of collaborative use of recycled carbon fiber reinforced polymer (RCFRP) fibers and recycled aggregate (RA) in concrete, which is called RCFRP fiber reinforced RA concrete (RFRAC). The mechanical properties of the composite were studied through experimental investigation, considering different RCFRP fiber contents (0%, 0.5%, 1.0%, and 1.5% by volume) and different RA replacement rates (0%, 10%, 20%, and 30% by volume). Specifically, ten different mixes were designed to explore the flowability and compressive and flexural strengths of the proposed composite. Experimental results indicated that the addition of RCFRP fibers and RA had a relatively small influence on the compressive strength of concrete (less than 5%). Moreover, the addition of RA slightly decreased the flexural strength of concrete, while the addition of RCFRP fibers could significantly improve the flexural performance. For example, the flexural strength of RA concrete with 1.5% RCFRP fiber addition increased by 32.7%. Considering the good flexural properties of the composite and its potential in reducing waste CFRP and construction solid waste, the proposed RFRAC is promising for use in civil concrete structures with high flexural performance requirements.

Flexural Capacity of Reinforced Recycled Aggregate Concrete Columns Under Seismic Loading: Database and a Simplified Model

This paper proposes a simplified envelop curve model for evaluation of capacity curve of reinforced recycled aggregate concrete (RAC) columns subjected to seismic loads. A seismic research database containing 53 reinforced RAC columns was established and applied to calibrate the envelop curve model. The effective initial stiffness, feature drift ratio, and various loads of collected RAC columns were discussed and modelled by a database analysis and a simplified sectional analysis. According to comparative results, effective initial stiffness, yield stiffness, and various drift ratios of RAC columns could be modelled simply considering the effects of axial load ratio and replacement ratio of recycled aggregate in RACs. Considering the weak self-properties of recycled aggregates, the study suggested the yield load of reinforced RAC columns under seismic loads could be taken simply as 80% of calculated peak load of the columns. The ultimate drift ratios of RAC columns were evaluated by a simplified linear function of peak drift ratios. The paper found that the lateral confinement index of columns has a significant influence on the flexural envelop curves of reinforced RAC columns. The comparative results verified that the proposed envelop curve model can evaluate the experimental behaviour with a good agreement.

Analysis on Mechanical Properties of Recycled Aggregate Concrete Members after Exposure to High Temperatures

In order to study the mechanical properties of recycled aggregate concrete (RAC) specimens after exposure to high temperatures, 120 RAC prism specimens, 57 reinforced recycled aggregate concrete (RRAC) specimens, and 56 steel reinforced recycled aggregate concrete (SRRAC) specimens were designed, involving two varying parameters such as recycled coarse aggregate (RCA) replacement percentage and temperature. The performance degradation of RCA materials, RRAC members, and SRRAC members after exposure to high temperatures was analyzed in depth. The research results show that after exposure to high temperatures the surface color of members may change from cinereous to gray-white. Some cracks may appear on surface of members and the mass of members may be lighter. With the increase of the experiencing temperatures, the bearing capacity (compressive, bending, and shearing) of RAC and its members are reduced, but their ductility and energy dissipation capacity have little effect on the change of high temperature. With the increase of the RCA replacement percentage, the mass loss ratio, ultimate bearing capacity, and peak deformation of each RAC and its members increase slightly, and the displacement ductility and energy dissipation capacity of the RRAC members decrease slightly. With the increase in replacement percentage of RCA, mechanical properties of RAC and their members have little effect after exposure to elevated temperatures, and the fluctuation range is within 20%.

Seismic Strength and Stiffness for Recycled Aggregate Concrete-Filled Steel Tube Frame

To study the seismic strength and stiffness for recycled aggregate concrete-filled steel tube (RACFST) frame, two-frame specimens made up of RACFST column and reinforced recycled aggregate concrete (RAC) beam were used for a seismic test under reversed low-cycle loading. The failure mechanism, hysteresis curve, strength attenuation, and stiffness degradation were determined for the specimens. The design methods for the story shear bearing capacity and stiffness for the single-layer single-span RACFST frame were discussed. It is shown that the seismic design requirements including “strong column weak beam” and “strong shear weak bending” can be met. The hysteresis curves are symmetric and the strength attenuation and rigidity degeneration change significantly, then change a little, and then significantly again under the same displacement. It is possible that the methods including elastic bending moment at the column end, plastic hinge at the column end, and plastic hinge at the column bottom can all be applied to the design calculation of the story shear bearing capacity for the single-layer single-span RACFST frame. The method adopted in this paper can be used to estimate the original elastic layer stiffness of the RACFST frame.

Dynamic behaviour and energy dissipation of reinforced recycled aggregate concrete beams under impact

Abstract In order to study the dynamic behaviour and energy dissipation of reinforced recycled aggregate concrete (RAC) beams under impact, four groups of reinforced RAC simply supported beams with various recycled coarse aggregate (RCA) replacement percentages are designed and tested under drop weight impact at the mid-span of beams and corresponding another four groups of beam specimens under static loading. The static resistance versus mid-span displacement curves are obtained from static loading test to analyse the effect of RCA replacement percentage on the beam's mechanical performance. It is concluded that the static resistance and stiffness of the RAC beam decrease slightly as the RCA replacement percentage increases and the deformation curve of reinforced RAC beam conforms to the classical bending theory of beam. In the drop weight impact test, the reinforced RAC beams failed with both global and local damage, and in bending controlled mode. The time history of impact forces, mid-span displacements and stress states of the beams are investigated. The mid-span displacement of the beams increases with the increase of RCA replacement percentage. The energy dissipation of the beams under impact is discussed based on the simplified resistance model. A concept of global damage energy dissipation is introduced and the method for calculating the global damage energy dissipation of the reinforced RAC beam under impact is proposed. The global damage energy dissipation ratio is defined and used to measure the proportion of global damage and local damage on reinforced RAC beam under impact. The experimental results presented here provide benchmark data for the further research work on the dynamic response of reinforced RAC beam under impact.