Research on working performance of waterborne aliphatic polyurethane modified concrete

Fan, Guoxi; Sha, Fei; Yang, Jing; Lin, Fantong; Ji, Xiang; Feng, Chao

doi:10.1016/j.jobe.2022.104262

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…LINK8 is a 3D two-node element used to model the reinforcing steel bars in the beam (Figure 7), a truss element that can account for the tensile behavior of the steel reinforcement. SOLID45 is a 3D eight-node solid element used to model the steel plates and bolts in a steel-concrete composite beam [61][62][63][64][65][66][67][68]. It is a general-purpose element that can account for material nonlinearity and damage, such as yielding of the steel plates under tension or shear.…”

Section: Numerical Investigationmentioning

confidence: 99%

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Amalraj,

Ilangovan

2023

Buildings

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Over the past few decades, research has been conducted to develop high-strength concrete (HSC) for high-rise structures and bridge decks. The research discussed in the study focuses on using polyurethane resin (PR) and aramid fibers (AF) to develop HSC, which enhances its strength, durability, and structural properties without increasing the cementitious content. This approach can lead to more sustainable and cost-effective construction practices by reducing the cementitious materials required. In the present investigation, M50-grade concrete mixes were designed in accordance with the guidelines mentioned in Indian Standard (IS) 10262 along with the addition of supplementary cementitious materials, such as fly ash and silica fume. Initially, varying percentages of AF (0% to 3%) and PR (0% to 6%) were added into the concrete mixes and detailed experimental investigations were completed on workability, strength, durability, and structural properties. It is concluded that the addition of AF and PR shows significant improvements in strength, durability, and structural properties compared to traditional HSC created with zero AF and PR content. As reinforced concrete (RC) elements serve as the final product for human construction projects, it is crucial to ensure that their structural properties are reliable. In order to validate the findings from experimental investigations, numerical simulations were conducted using the ANSYS commercial package software. Specifically, the structural properties of RC beams were analyzed using this software, allowing for further validation and verification of the experimental results. From the detailed investigation, it is concluded that 2.5% addition of AF and 4% addition of PR demonstrates better results and is considered the optimum ingredient dosage, which can be used as a reference for future studies and practical applications. These findings can result in the development of new and improved building materials and techniques that can potentially lead to safer, more durable, and sustainable structures.

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Section: Numerical Investigationmentioning

confidence: 99%

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Amalraj,

Ilangovan

2023

Buildings

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“…The total porosity is directly obtained from the MIP report. However, when conducting MIP testing, some assumptions need to be made, one of which is that each pore is connected directly or through larger pores to the specimen surface [27], a criterion that is unlikely to be met by ordinary porous materials. The ink-bottle effect is when a larger pore is preceded by a smaller neck in the intrusion path of the mercury.…”

Section: Prediction Of Capillary Water Absorptionmentioning

confidence: 99%

“…The findings demonstrated that the appropriate content of the waterborne polyurethane increased the elastic modulus, compressive strength, splitting tensile strength, and flexural strength of the waterborne-polyurethane-modified concrete. Furthermore, it could effectively improve the chloride penetration resistance and impermeability of the concrete after the waterborne polyurethane was added [27]. However, there are few studies on waterborne-polyurethane-modified recycled concrete with different contents of waterborne polyurethane.…”

Section: Introductionmentioning

confidence: 99%

Study on Capillary Water Absorption of Waterborne-Polyurethane-Modified Recycled Coarse Aggregate Concrete

Fan,

Xiang,

Yang

et al. 2023

Polymers

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The reuse of construction and demolition waste as a substitute for natural coarse aggregate in the production of recycled concrete has been widely used. In order to study the capillary water absorption performance of waterborne-polyurethane-modified recycled aggregate concrete (WPUMRC), the effects of different curing systems, polymer–cement ratios, and waterborne polyurethane addition methods on the cumulative water absorption and the rate of capillary water absorption of WPUMRC were analyzed, and through MIP tests, the micro modification mechanism of waterborne polyurethane in recycled concrete was analyzed. The results indicate that the optimal curing system for both DC (waterborne polyurethane is added separately from water) and HC (waterborne polyurethane is mixed with some effective water and then added) is the 14 d standard curing–14 d indoor natural drying curing system. Waterborne polyurethane can fill the pores and micro-cracks inside WPUMRC or interweave with the hydration products of cement to form a spatial network structure, reducing the porosity, and thereby improving the capillary water absorption performance of WPUMRC. Based on the MIP test results, the grey correlation method was used to establish the relationship between capillary water absorption and the pore structure of WPUMRC under the optimal curing system. In addition, the prediction model of capillary water absorption in recycled concrete was established according to the test results, which can be used to predict WPUMRC’s capillary water absorption performance.

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“…However, the shear modulus of PU-reinforced crushed stone slightly increases with the increase in loading frequency, but the damping ratio is not sensitive to it. In order to explore the effect of waterborne polyurethane on the mechanical properties, durability, and microstructure of concrete, Fan et al [36] carried out a series of experimental research and theoretical analysis. The test results showed that the compressive strength, splitting tensile strength, flexural strength, and elastic modulus of concrete can be improved by adding an appropriate amount of waterborne polyurethane.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Mechanical Properties and Mechanism of Waterborne Polyurethane-Reinforced Road Demolition Waste as Road Bases

Zhao

et al. 2022

Polymers

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The recycling and reuse of construction waste have not only effectively protected natural resources but also promoted the sustainable development of the environment. Therefore, in this article, waterborne polyurethane (WPU) as a promising new polymer reinforcement material was proposed to reinforce the road demolition waste (RDW), and the mechanical performance of WPU-reinforced RDW (named PURD) was investigated using triaxial unconsolidated and undrained shear (UU) and Scanning Electron Microscope (SEM) tests. The results showed that under the same curing time and confining pressure, the shear strength of PURD increased with the increase in WPU content. When the WPU content was 6%, the WPU presented the best reinforcement effect on RA. The failure strain of PURD increased with the increase in confining pressure, but increased first and then reduced with the increase in WPU content. The specimens with 5% WPU content showed the best ductility. At the curing time of 7 and 28 days, the internal friction angle and cohesion of PURD increased with the increase in WPU content, and they reached a maximum when the WPU content was 6%. The internal friction angle barely budged, but the cohesion increased obviously. The enhancement effect of WPU was attributed to the spatial reticular membrane structure produced by wrapping and bonding particles with the WPU film. Microscopic analysis showed that with the increase in WPU content, the internal pore and crack size of PURD gradually decreased. As the WPU content increased, the WPU film became increasingly thicker, which increased the adhesion between WPU and RA particles and made the structure of PURD become increasingly denser.

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Research on working performance of waterborne aliphatic polyurethane modified concrete

Cited by 10 publications

References 42 publications

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Study on Capillary Water Absorption of Waterborne-Polyurethane-Modified Recycled Coarse Aggregate Concrete

Triaxial Mechanical Properties and Mechanism of Waterborne Polyurethane-Reinforced Road Demolition Waste as Road Bases

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