Flexible and stretchable polyurethane/waterglass grouting material

Yang, Zhengpeng; Zhang, Xuefeng; Liu, Xuan; Guan, Xiaohong; Zhang, Chunjing; Niu, Yutao

doi:10.1016/j.conbuildmat.2017.01.113

Cited by 89 publications

(35 citation statements)

References 27 publications

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“…This is also mainly due to the addition of the flexible segments of prepolymer grafted onto the epoxy resin chain. As a result, the prepolymer was interspersed in the epoxy resin system and intertwined with the epoxy chain to form an interpenetrating network structure, thus changing the brittleness of the epoxy resin [37]. When the material is subjected to stress, the structure of the network can disperse the stress and the flexible chain can help to maintain a higher elongation at break.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Toluene-Diisocyanate-Trimer-Modified Epoxy Resin

Zhang

Qiao

et al. 2019

Polymers

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In this paper, a novel modified epoxy resin with an interpenetrating network structure for use as a grouting material with high toughness was prepared by a method of graft copolymerization between polyurethane prepolymer (PUP) trimer and epoxy resin (E-44). Polyurethane prepolymer was synthesized using poly(propylene glycol) (PPG) and 2,4-toluene diisocyanate trimer (TDIT) at 70 °C for 3 h. The graft copolymer was prepared by grafting polyurethane prepolymer onto the side chain of epoxy resin at 110 °C. The mechanical properties, fracture surface morphology, chemical structure, thermal properties, and corrosion resistance of the modified epoxy resin curing products were studied. Due to the beneficial flexible segments and the interpenetrating network structure, the results show that when the ratio of epoxy resin to polyurethane prepolymer is 10:2, the optimum mechanical properties are obtained; these include a compressive resistance of 184.8 MPa, impact property of 76.6 kJ/m2, and elongation at break of 31.5%. At the same time, the modified epoxy resin curing product also has excellent heat and corrosion resistance. This work provides a new method for the study of epoxy resins with high performance.

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Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Toluene-Diisocyanate-Trimer-Modified Epoxy Resin

Zhang

Qiao

et al. 2019

Polymers

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“…Polyurethane is one of the most versatile polymer material that has been widely used as coatings, adhesives, foam mattresses, medical implants, insulator and grouting material [1]. Polyurethane as a grouting material has been gaining a lot of attention from manufacturers from all over the world due to its extraordinary properties such as light weight, good permeability and good mechanical performance [2]. Polyurethane grout is a rigid foam material.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Castor-Based Polyurethane Composites Filled With Waste Carbon Tyres (Wct) as Grouting Material

et al. 2020

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This research focused on the fabrication of castor-based polyurethane composite (CPUC) filled with waste carbon tyres (WCT) with particle size of 200 µm that acts as reinforcing filler. WCT was first sieved using a sieving machine to obtain uniform particle size. WCT loading was varied at 0wt%, 2wt%, 4wt% and 6wt%. The effect of WCT loading in CPUC was evaluated based on their foam reaction time, apparent density, rheology, compression strength, morphology and thermal properties. The foam reaction time of CPUC achieved was in the range of industrial PU grout’s properties. The rheology index and compression strength of CPUC decreased with increasing WCT loading. CPUC with 2wt% of WCT loading achieved the optimum compression strength where it increased from 2.58 MPa to 3.39 MPa with the improvement of 31.40% compared to neat PU. FESEM micrograph showed that CPUC consists of closed foam cell indicating the rigidity of the CPUC. The addition of 2wt% of WCT resulted in achieving the optimum thermal stability of CPUC where CPUC2 had the highest char residue content. The high residue content indicated that CPUC2 had the lowest decomposition of elements as WCT acted as heat barrier in CPUC matrix thus increasing the thermal stability of CPUC2.

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“…Generally materials characterized as chemical grouts are polyurethane, epoxy resins, acrylamide, methacrylate and acrylate [ 2 , 3 ]. Moreover, water glass and a number of composite materials such as polyurethane/water glass [ 4 ], epoxy resin/sand [ 5 ], acrylamide/sand [ 6 ], have also been used as grouting materials. Although, there is lot of experience in controlling the viscosity, achieving the desired penetration length, desired gel time and good sealing of the small cracks or pores by using organic molecules based grouts, the big issue is their toxicity, As shown by Svedrup et al there was considerable leaching from the acrylamide based grout used in a tunnel in Norway [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Silica sol as grouting material: a physio-chemical analysis

2018

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At present there is a pressing need to find an environmentally friendly grouting material for the construction of tunnels. Silica nanoparticles hold great potential of replacing the organic molecule based grouting materials currently used for this purpose. Chemically, silica nanoparticles are similar to natural silicates which are essential components of rocks and soil. Moreover, suspensions of silica nanoparticles of different sizes and desired reactivity are commercially available. However, the use of silica nanoparticles as grouting material is at an early stage of its technological development. There are some critical parameters such as long term stability and functionality of grouted silica that need to be investigated in detail before silica nanoparticles can be considered as a reliable grouting material. In this review article we present the state of the art regarding the chemical properties of silica nanoparticles commercially available, as well as experience gained from the use of silica as grouting material. We give a detailed description of the mechanisms underlying the gelling of silica by different salt solutions such as NaCl and KCl and how factors such as particle size, pH, and temperature affect the gelling and gel strength development. Our focus in this review is on linking the chemical properties of silica nanoparticles to the mechanical properties to better understand their functionality and stability as grouting material. Along the way we point out areas which need further research.

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Flexible and stretchable polyurethane/waterglass grouting material

Cited by 89 publications

References 27 publications

Preparation and Properties of Toluene-Diisocyanate-Trimer-Modified Epoxy Resin

Preparation and Properties of Toluene-Diisocyanate-Trimer-Modified Epoxy Resin

Preparation of Castor-Based Polyurethane Composites Filled With Waste Carbon Tyres (Wct) as Grouting Material

Silica sol as grouting material: a physio-chemical analysis

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