Study on Fatigue Test and Life Prediction of Polyurethane Cement Composite (PUC) under High or Low Temperature Conditions

Gao, Hongshuai; Sun, Quansheng

doi:10.1155/2020/2398064

Cited by 19 publications

(10 citation statements)

References 25 publications

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“…The main parameters such as loading frequency, loading waveform and strain level need to be calibrated before the four-point bending fatigue test, as different parameter choices will greatly affect the fatigue life of EPUC. In this paper, a loading frequency of 10 Hz and a continuous uninterrupted semi-positive vector wave were selected for the fatigue test [24]; the strain levels were 400 µε, 600 µε, 800 µε, 1000 µε and 1200 µε [25]. When the bending stiffness modulus of the specimen was reduced to half of the initial stiffness modulus, the experiment was stopped, and the specimen was considered to have been damaged by fatigue.…”

Section: Fatigue Testmentioning

confidence: 99%

“…According to the expression of Hooke's law-σ = E ε-the ε-N fatigue equation is transformed into a classical S-N fatigue equation, as shown in Table 4 below: We compared EPUC to the PUC fatigue equation proposed by Gao Hongshuai [25] and drew it in Figure 21 to explore the differences between them. It can be seen from Figure 21 that the fatigue life of EPUC increases at different temperatures.…”

Section: Fatigue Propertiesmentioning

confidence: 99%

“…The increase is the largest at low temperatures, indicating that the addition of rubber particles to PUC can improve its fatigue life to a certain extent. We compared EPUC to the PUC fatigue equation proposed by Gao Hongshuai [25] and drew it in Figure 21 to explore the differences between them. It can be seen from Figure 21 that the fatigue life of EPUC increases at different temperatures.…”

Section: Fatigue Propertiesmentioning

confidence: 99%

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Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Jia

Sun

et al. 2021

Materials

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In order to solve issues related to bridge girders, expansion devices and road surfaces, as well as other structures that are prone to fatigue failure, a kind of fatigue-resistant elastic polyurethane concrete (EPUC) was obtained by adding waste rubber particles (40 mesh with 10% fine aggregate volume replacement rate) to conventional engineering polyurethane concrete (PUC). Based on the preparation and properties of EPUC, its constitutive relation was proposed through compression and tensile tests; then, a scanning electron microscope (SEM), an atomic force microscope (AFM) and a 3D non-contact surface profilometer were used to study the failure morphology and micromechanisms of EPUC. On this basis, four-point bending fatigue tests of EPUC were carried out at different temperature levels (−20 °C, 0 °C, 20 °C) and different strain levels (400 με~1200 με). These were used to analyze the stiffness modulus, hysteresis angle and dissipated energy of EPUC, and our results outline the fatigue life prediction models of EPUC at different temperatures. The results show that the addition of rubber particles fills the interior of EPUC with tiny elastic structures and effectively optimizes the interface bonding between aggregate and polyurethane. In addition, EPUC has good mechanical properties and excellent fatigue resistance; the fatigue life of EPUC at a room temperature of 600 με can grow by more than two million times, and it also has a longer service life and reduced disease frequency, as well as fewer maintenance requirements. This paper will provide a theoretical and design basis for the fatigue resistance design and engineering application of building materials. Meanwhile, the new EPUC material has broad application potential in terms of roads, bridges and green buildings.

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Section: Fatigue Testmentioning

confidence: 99%

Section: Fatigue Propertiesmentioning

confidence: 99%

Section: Fatigue Propertiesmentioning

confidence: 99%

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Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Jia

Sun

et al. 2021

Materials

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“…The lowest temperature in the winter reaches about −40 • C in cold areas in the north, and the highest temperature in the summer is close to +40 • C in hot areas. Hongshuai Gao et al [14] found that temperature has a great influence on the fatigue life of PUC in their study in which PUC was used in a steel bridge deck pavement. PUC shows large strength differences under different ambient temperatures in practical applications, which in turn affect the bridge-strengthening effect.…”

Section: Introductionmentioning

confidence: 99%

Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC)

Hou

Li³

et al. 2022

Materials

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Polyurethane cement (PUC) is now commonly used in the reinforcement of old bridges, which exhibit various issues such as poor toughness, temperature-sensitive mechanical properties, and brittle failure. These problems can lead to the failure of the reinforcement effect of the PUC on old bridges in certain operating environments, leading to the collapse of such reinforced bridges. In order to alleviate these shortcomings, in this study, the toughness of PUC is improved by adding polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber. In addition, we study the change law of the flexural strength of PUC between −40 °C and +40 °C. The control parameters evaluated are fiber type, fiber volume ratio, and temperature. A series of flexural tests and scanning electron microscope (SEM) test results show that the flexural strength first increases and then decreases with the increase in the volume-doping ratio of the three fibers. The optimum volume-mixing ratios of polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber are 0.3%, 0.04% and 1%, respectively. Excessive addition of fiber will affect the operability and will adversely affect the mechanical properties. The flexural strength of both fiber-reinforced and control samples decreases with increasing temperature. Using the flexural test results, a two-factor (fiber content, temperature) BP neural network flexural strength prediction model is established. It is verified that the model is effective and accurate, and the experimental value and the predicted value are in good agreement.

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“…Polyurethane concrete is a composite material composed of two components with polyurethane as the binder and cement and aggregate as the filler [ 1 , 2 ], which has the characteristics of quick-hardening, high initial strength, and excellent comprehensive mechanical strength, but it has high usage costs and construction process requirements. The repair method can be applied for rapid repair of concrete in anchorage zone of bridge expansion joint, which solves the problems such as ease of damage, poor driving comfort, long maintenance cycles [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid

et al. 2021

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In view of the problems of traditional repair materials for anchorage concrete of expansion joints, such as ease of damage and long maintenance cycles, the design of polyurethane concrete was optimized in this article, which could be used for rapid repair of concrete in anchorage zone of expansion joints. A new type of carbon fiber grid–polyurethane concrete system was designed, which makes the carbon fiber grid have an excellent synergistic effect with the quick-hardening and high-strength polyurethane concrete, and improved the flexural bearing capacity of the polyurethane concrete. Through the four-point bending test, the influence of the parameters such as the number of grid layers, grid width, and grid density on the flexural bearing capacity of polyurethane concrete beams was tested. The optimum preparation process parameters of carbon fiber grid were obtained to improve the flexural performance of polyurethane concrete. Compared with the Normal specimen, C-80-1’s average flexural strength increased by 47.7%, the failure strain along the beam height increased by 431.1%, and the failure strain at the bottom of the beam increased by 68.9%. The best width of the carbon fiber grid was 80 mm, and the best number of reinforcement layers was one layer. The test results show that the carbon fiber grid could improve the flexural bearing capacity of polyurethane concrete. The carbon fiber grid–polyurethane concrete system provides a new idea for rapid repair of the anchorage zone of bridge expansion joints, and solves the problems such as ease of damage and long maintenance cycles of traditional repair materials, which can be widely used in the future.

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Study on Fatigue Test and Life Prediction of Polyurethane Cement Composite (PUC) under High or Low Temperature Conditions

Cited by 19 publications

References 25 publications

Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC)

Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid

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