Weathering of Roofing Insulation Materials under Multi-Field Coupling Conditions

Zhou, Shan; Ding, Yang; Wang, Zhongping; Dong, Jicheng; She, Anming; Wei, Yongqi; Li, Ruguang

doi:10.3390/ma12203348

Cited by 18 publications

(11 citation statements)

References 29 publications

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“…EPUC (EPUC) is a composite material mixed with one component or two component Polyurethane as the binder, cement sand as the filler aggregate and mixed with a certain proportion of rubber particles. Compared with conventional concrete, EPUC has lower density, higher strength and a shorter fitting time and, in the flow state, it is a kind of colloid in nature, with strong bonding force, no peeling damage and a strong ability to limit cracks; however, it has high usage costs and considerable construction process requirements [2,3]. At the same time, the addition of rubber particles can effectively reduce the internal stress and failure cracks of EPUC; it effectively inherits the energy absorption and impact resistance characteristics of the rubber particles [4], which can protect engineering structures and resist fatigue, thus prolonging a given structure's service life.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Jia

Sun

et al. 2021

Materials

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“…The reproduction tests were performed for all the eluates. When observing the reproduction results for both eluates, after 64 days, a stabilization of the reproduction behavior was noticed at the end of the test, indicating a reduction of the toxicity and decrease in the presence of active ingredients from the waterproof material when exposed to water for a longer time [ 28 ]. The drop in the number of offsprings was not very alarming for eluates of the waterproof material.…”

Section: Resultsmentioning

confidence: 99%

Testing of Eluates from Waterproof Building Materials for Potential Environmental Effects Due to the Behavior of Enchytraeus albidus

2021

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In order to determine the potential environmental impact of construction products, it is necessary to evaluate their influence on organisms exposed to them or their eluates under environmental conditions. The behavior of the white worm Enchytraeus albidus is a useful tool for assessing the potential environmental impact of construction products in contact with water and soil. This study investigates the environmental effects of eluates from two construction products, a reactive waterproofing product, and an injection resin, on the reproduction and avoidance behavior of E. albidus. The eluates were prepared according to existing guidelines. The soil used for the tests was moistened with the eluates of the construction products. The reproduction results of the worms were collected after six weeks of exposure. Offsprings were counted under the microscope and statistically analyzed. Results from the avoidance behavior were collected after 48 h of exposure, and results were compared with the reproduction results. The eluates from both construction products induced significant changes in the reproduction behavior of E. albidus. Undiluted or only slightly diluted eluates of the injection resin drastically reduced the reproduction of the worms, whereas the leaches of the reactive waterproofing product only had a minor effect. The avoidance results for the injection resin indicates that its presence in the habitat is clearly detrimental to the survival of E. albidus, while the avoidance results for the waterproofing resin showed an initial avoidance of the eluates, but no harmful effects were observed. The avoidance test is a way of rapid toxicity screening of environmental samples when time is a critical parameter to measure possible environmental effects. This study shows that ecotoxicological tests using Enchytraeids are a valuable and important tool for understanding the mode of action of eluates from construction products in the environment.

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“…In addition, it does not need to spend a lot of time on the complicated process of programming and solving problems. This feature makes the software a very convenient tool for theoretical realization in scientific research, rather than black box software which can only input the parameters for a solution [34,35].…”

Section: Simulation Of the Chloride Ion Transport Process Based On Co...mentioning

confidence: 99%

Experimental Study and Simulation Calculation of the Chloride Resistance of Concrete under Multiple Factors

et al. 2021

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Cement is widely used in marine concrete, and its resistance to chloride ion corrosion has been widely considered. In this paper, based on a laboratory test, the influence of different hydrostatic pressures, coarse aggregate contents and w/c ratios on the chloride resistance performance is analyzed. Based on COMSOL finite element software, a two-dimensional cementitious materials model is established, and the simulation results are compared with the experimental results. The results show that the penetration depth of chloride ions in cement increases with the increase of the w/c ratio. Under the hydrostatic pressure of 0 MPa, when the w/c ratio is 0.35, the penetration depth of chloride ions is 7.4 mm, and the simulation result is 8.0 mm. When the w/c ratio is 0.45, the penetration depth of chloride ions is 9.3 mm, and the simulation result is 9.9 mm. When the w/c ratio is 0.55, the penetration depth of chloride ions is 12.9 mm, and the simulation result is 12.1 mm. Under different hydrostatic pressures, the penetration depth of chloride ions obviously changes, and with the increase in hydrostatic pressure, the penetration depth of chloride ions deepens. Under the w/c ratio of 0.35, when the hydrostatic pressure is 0.5 MPa, the penetration depth of chloride ions is 11.3 mm, and the simulation result is 12.1 mm. When the hydrostatic pressure is 1.0 MPa, the penetration depth of chloride ions is 16.2 mm, and the simulation result is 17.5 mm.

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Weathering of Roofing Insulation Materials under Multi-Field Coupling Conditions

Cited by 18 publications

References 29 publications

Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Preparation and Mechanical-Fatigue Properties of Elastic Polyurethane Concrete Composites

Testing of Eluates from Waterproof Building Materials for Potential Environmental Effects Due to the Behavior of Enchytraeus albidus

Experimental Study and Simulation Calculation of the Chloride Resistance of Concrete under Multiple Factors

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