Performance optimization of one-component polyurethane healing agent for self-healing concrete

Hu, Zun-Xiang; Hu, Xiangming; Cheng, Weimin; Zhao, Yanyun; Wu, Mingyue

doi:10.1016/j.conbuildmat.2018.05.199

Cited by 160 publications

(55 citation statements)

References 30 publications

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“…Hu et al incorporated miniaturized glass tubes (30 mm length and 8 mm diameter) filled with a mixture of polyurethane, which is one-component healing agent with high viscosity and acetone, which serves as a viscosity-decreasing agent (Hu et al, 2018). The authors confirmed that acetone decreased the overall viscosity to a sufficient level, which eventually led to filling of the crack with the size of 300 um.…”

Section: Glass Tube-based Approachmentioning

confidence: 99%

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Shahsavari

Hwang

2020

Front. Mater.

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Nature-inspired ensemble of organic and inorganic constituents, such as that found in the microstructure of nacre and dactyl clubs of Mantis shrimp, has evolved into the model system for the structural design of industrial composites. This novel design concept, which helps attaining the balance between strength, toughness and ductility, has not only induced a paradigm shift in the synthesis of advanced materials such as graphene-based composites but also, in the development of more abundant, low-cost materials such as cement and concretes. The advance in synthetic techniques and the advent of new manufacturing technologies such as 3D printing has enabled effective integration of cementitious materials with soft materials across various length scales. Furthermore, novel functional properties such as self-healing have also been materialized based on a variety of strategies. This review will provide the comprehensive overview on the ongoing research efforts, encompassing 3D printing, self-healing strategies and integration of C-S-H with organic components, all of which are actively exploited in synthesizing bioinspired, multifunctional cementitious materials.

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Section: Glass Tube-based Approachmentioning

confidence: 99%

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Shahsavari

Hwang

2020

Front. Mater.

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“…4,5 Due to low utilization and high output, stockpiling is the main disposal approach for CG, which poses serious damages to ecological environment for gangue mounds occupy lots of farmland, as well as pollute the air atmosphere and groundwater. [6][7][8][9][10] Hence, the feasible and economic application of CG is an urgent need for environmental protection.…”

Section: Introductionmentioning

confidence: 99%

Impact of titanate coupling agent on properties of high density polyethylene composite filled with coal gangue

Ding

Zhang

et al. 2020

Surface & Interface Analysis

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In this study, surface modification of coal gangue (CG) was performed with titanate coupling agent 201 (isopropyl tri(dioctylpyrophosphate) titanate), and the effects of surface modifier on mechanical properties and thermal stability of high‐density polyethylene filled with CG (HDPE/CG) and high‐density polyethylene filled with modified CG (HDPE/mCG) composites were investigated. The coupling agent was successfully grafted on CG surface through chemical reaction according to the analyses of Fourier transform infrared spectroscopy (FT‐IR) and X‐ray photoelectron spectroscopy (XPS), and the coupling agent can effectively enhance the hydrophobicity of surface that was verified by water contact angle beyond 90° of modified CG sample. With the introduction of coupling agent, some enhancements of tensile strength, flexural strength, and impact strength were observed in HDPE/mCG compared with HDPE/CG, due to the improved compatibility between mCG fillers and matrix. The increased storage modulus and decreased loss factor of HDPE/mCG composite further confirm the stronger interface adhesion after modification. Moreover, it is found that titanate coupling agent 201 can improve the thermal stability of HDPE/mCG composite to some extent.

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“…Polyurethane, a representative of organic materials, is produced by reacting polyester polyol with polyisocyanate. It is widely used because of its short curing time and high foaming coefficient; however, its high foaming speed and viscosity prevent its full diffusion in strata [11][12][13]. Although other organic materials, such as epoxy and phenolic resins, have high mechanical strength and strong thermal stability, they are insoluble in water and thus must be diluted with specific diluents before use; this requirement increases their cost [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

Sun

Zhang

Sun

2019

Advances in Civil Engineering

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A new soluble polymer foaming (PF) grouting material was developed by using hydrophilic amino resin as the base material and adding other cross-linking, foam, foam stabilizing, toughening, and coupling agents. The PF material exhibited low viscosity, excellent adhesion, and strong penetration. The grouting reinforcement effect of the proposed PF material on broken coal masses was investigated and compared with that of traditional superfine cement (SC) through simulation experiments. Results showed that after grouting, fractures, joints, and other failure planes inside raw coal were filled and bonded, and the mechanical strength of the grout-coal concretion improved relative to the residual strength of raw coal. The average uniaxial compressive strength of SC specimens was 6.16 MPa, whereas that of PF specimens was 10.85 MPa. Moreover, the PF specimens presented an obvious characteristic of plastic strengthening. Analyzing the reinforcement effect of the grouting materials on the basis of single structural plane theory revealed that at the critical state, the average σ3 value of SC specimens was 1.43 MPa, whereas that of PF specimens was 3.09 MPa. In addition, coordination between the lateral and axial deformations of the PF specimens during compression promoted the formation of a bearing structure that can adapt to deformation. This structure is crucial for the safe operation of coal mines.

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Performance optimization of one-component polyurethane healing agent for self-healing concrete

Cited by 160 publications

References 30 publications

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Impact of titanate coupling agent on properties of high density polyethylene composite filled with coal gangue

Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

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