State of the art of macro-defect-free composites

Ekincioglu, Ozgur; Özkul, M. Hulusi; Struble, Leslie J.; Paţachia, Silvia

doi:10.1007/s10853-018-2328-y

Cited by 11 publications

(2 citation statements)

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“…[ 11 ]. The calcium aluminate cement–polyvinyl alcohol polymer (CAC-PVA) system was one of the examples with very high flexural strength up to 150 MPa, close to that of ordinary steel [ 14 , 15 , 16 ]. The cross-linking structure formed between organic polymer and inorganic matrix was proved to be the reason for the high flexural strength of MDF cement.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Xing

Wei

et al. 2022

Polymers

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In this work, two series of chemically reactive polymers, silane coupling agents (SCAs) and water-soluble polymers, were specifically designed as an additive to improve the ductility of slag geopolymer paste by vibration pressure technique. The influences of organic polymers on the fluidity, rheological behavior, mechanical property, porosity, and toughening mechanism of slag geopolymer were investigated. The polycondensation and bonding characteristics of organic–inorganic products were calculated by 1H liquid nuclear magnetic resonance (NMR) technology and Fourier transform infrared (FT-IR). The polymerization degree of composite geopolymer was evaluated by 29Si NMR and X-ray photoelectron spectroscopy (XPS). The microscopic morphology of the geopolymer matrix was analyzed using scanning electron microscopy (SEM). The results showed that the dosage of the KH570 and PAA-Na with 5 wt% behaved best in improving the flexural strength and the compressive strength of geopolymer in their corresponding organic series, respectively. The addition of polymers decreased the fluidity and the fluidity loss ratio of geopolymer slurry but reduced the harmful pores of hardened geopolymer. The organic polymers acting as bridge-fixed water molecules weakened the repulsion force, and formed a three-dimensional network through molecular interweaving in a geopolymer matrix. Methacryloxy in silane coupling agents and carboxyl group in water-soluble polymers may contribute to the improvement of hydration product structure through strong bonding with C-A-S-H. Microscopic measurements indicated that the addition of KH570 and PAA-Na in geopolymer could form 73.55% and 72.48% Si-O-Si with C-A-S-H gel, higher than the reference, and increase the polycondensation degree of C-A-S-H phase, reflected by the increased generation of Q2 and Q2(1Al) and the longer chain length, leading to a higher densified geopolymer matrix with high ductility.

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Section: Introductionmentioning

confidence: 99%

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Xing

Wei

et al. 2022

Polymers

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“…Macro defect free cements represent ceramic-polymer composite materials with better mechanical resistance than traditional ones [31][32][33][34][35][36][37]. The surface hardness and scratch resistance of these materials could be improved by glazing.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Cement Composites Glazing by Concentrated Solar Energy

et al. 2021

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Macro defect free (MDF) cements are polymer-cement composites characterized by high biaxial flexural strength compared to traditional concrete, having as a drawback a low water resistance. Glazing these composite materials with an inorganic enamel containing TiO2 nano-particles has led to a high water-stable material with advanced photocatalytic properties. Classic glazing by thermal treatment of samples, at 1050 °C, requires energy consumption and long-time performing. The purpose of this paper is to test the use of solar radiation as a source of energy in the glazing process. A vertical axis solar furnace has been used, from PROMES-CNRS Solar Laboratory, Font-Romeu Odeillo, France, and it has been observed that a uniform appearance of the glaze coating has been achieved; it shows high scratch resistance, meaning a good hardness and adhesion to the substrate. The obtained film was also characterized by SEM, EDS and XRD, aiming to evidence the coat morphology, the TiO2 distribution and its crystallinity alteration, when compared to the samples obtained by classic thermal treatment. The conclusion of the paper is that using solar radiation in the MDF cement glazing process is a promising approach for obtaining multifunctional materials.

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Biomimetic Mechanical Robust Cement‐Resin Composites with Machine Learning‐Assisted Gradient Hierarchical Structures

Wu,

Pan,

Huang

et al. 2024

Advanced Materials

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Biological materials relying on hierarchically ordered architectures inspire the emergence of advanced composites with mutually exclusive mechanical properties, but the efficient topology optimization and large‐scale manufacturing remain challenging. Herein, this work proposes a scalable bottom‐up approach to fabricate a novel nacre‐like cement‐resin composite with gradient brick‐and‐mortar (BM) structure, and demonstrates a machine learning‐assisted method to optimize the gradient structure. The fabricated gradient composite exhibits an extraordinary combination of high flexural strength, toughness, and impact resistance. Particularly, the toughness and impact resistance of such composite attractively surpass the cement counterparts by factors of approximately 700 and 600 times, and even outperform natural rocks, fiber‐reinforced cement‐based materials and even some alloys. The strengthening and toughening mechanisms are clarified as the regional‐matrix densifying and crack‐tip shielding effects caused by the gradient BM structure. The developed gradient composite not only endows a promising structural material for protective applications in harsh scenarios, but also paves a new way for biomimetic metamaterials designing.

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State of the art of macro-defect-free composites

Cited by 11 publications

References 100 publications

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Polymer-Cement Composites Glazing by Concentrated Solar Energy

Biomimetic Mechanical Robust Cement‐Resin Composites with Machine Learning‐Assisted Gradient Hierarchical Structures

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