Enhancements and mechanisms of nanoparticles on wear resistance and chloride penetration resistance of reactive powder concrete

Wang, Danna; Zhang, Wei; Ruan, Yanfeng; Yu, Xun; Han, Baoguo

doi:10.1016/j.conbuildmat.2018.09.041

Cited by 42 publications

(13 citation statements)

References 20 publications

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“…Nevertheless, an agreement has not been reached yet on the reason of promoting the cement hydration by nano-TiO 2 . Recently, it has been claimed that nano-TiO 2 is capable of enhancing the rate and the peak of cement hydration due to its nucleation and particle-filling effects without participation in the hydration process [137,138,139]. As Lawrence et al [140] revealed, nano-TiO 2 could act as a nucleus in the cement matrix to accelerate the formation of C-S-H gel.…”

Section: Properties Of Photocatalysis Cementitious Materialsmentioning

confidence: 99%

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TiO2-based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, and Assessment Techniques

2019

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Applications of heterogeneous photocatalytic processes based on semiconductor particles in cement-based materials have received great attention in recent years to enhance the aesthetic durability of buildings and reducing global environmental pollution. Amongst all, titanium dioxide (TiO2) is the most widely used semiconductor particle in structural materials with photocatalytic activity because of its low cost, chemically stable nature, and absence of toxicity. Utilization of TiO2 in combination with cement-based materials would plunge the concentration of urban pollutants such as NOx. In fact, cementitious composites containing TiO2 have already found applications in self-cleaning buildings, antimicrobial surfaces, and air-purifying structures. This paper aims to present a comprehensive review on TiO2-based photocatalysis cement technology, its practical applications, and research gaps for further progression of cementitious materials with photocatalytic activity.

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Section: Properties Of Photocatalysis Cementitious Materialsmentioning

confidence: 99%

“…Influencing parameters affecting the performance of photocatalytic cement-based materials extracted from [137,155,166,167,168,169]. …”

Section: Figurementioning

confidence: 99%

TiO2-based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, and Assessment Techniques

2019

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“…The results once again showed that YREC promoted hydration. Moreover, the calcium hydroxide crystal (CH) of LY-4 developed better at 11.3° according to Figure 13 a. Wang et al [ 50 ] and Haruehansapong et al [ 51 ] reported that the development of CH crystal led a negative effect on the strength. Han et al [ 52 ] discovered that the refinement of CH crystal size and quantity could further improve the interface transition zone, and thus enhance the concrete compactness and strength.…”

Section: Resultsmentioning

confidence: 97%

The Influence of a Novel Hydrophobic Agent on the Internal Defect and Multi-Scale Pore Structure of Concrete

Zhang

et al. 2021

Materials

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In high humidity areas, it is necessary to improve the impermeability of concrete to water and other erosion solutions. The internal defect and pore channel of concrete are the main factors affecting the impermeability and durability. In this paper, a novel hydrophobic agent named Yellow River Engineering Consulting (YREC) was prepared. The relative internal defect degree of concrete with different curing ages and YREC contents was evaluated by ultrasonic non-destructive testing as qualitative characterization method, and the effect of YREC on hydration reaction was investigates using X-ray powder diffraction (XRD). Water permeability and contact angle tests were used to analyze the internal and external hydrophobicity induced by YREC addition, respectively. The pore structure changes of concrete mortar matrix induced by YREC were further discussed applying low-temperature liquid nitrogen adsorption (LT-NA) and mercury intrusion/extrusion porosimetry (MIP). The results indicated that YREC not only improves the impermeability of water, but also greatly enhances the mechanical strength. In the case of mixing YREC, the porosity of concrete mortar matrix decreases accompanied with the more advantage pores (micropores and transition pores) developed. Based on the relative internal defect degree and the changes of multi-scale pore structure, the functionality and durability of concrete with 4% YREC addition are the most desirable.

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“…Studies have shown that moisture has a direct or indirect effect on concrete damage. Concrete damage that is not directly related to moisture can also accelerate the transmission of moisture inside the concrete [11], such as with cracking damage and wear damage.…”

Section: Introductionmentioning

confidence: 99%

Influence of a New Type of Graphene Oxide/Silane Composite Emulsion on the Permeability Resistance of Damaged Concrete

Chen

Zhang²,

et al. 2021

Coatings

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Through penetration depth tests, capillary water absorption tests under different abrasion depths, and capillary water absorption tests of a cement mortar test block with crack damage, a self-prepared, novel, graphene oxide/silane composite emulsion used for the effect of wear or cracking damage was studied. The waterproof performance of concrete and the protective mechanism of a composite emulsion was verified by scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis. The test results showed that the penetration depth of the composite emulsion reached depths greater than 9 mm, which yielded a good waterproof effect; when the concrete was cracked or worn, the composite emulsion still had a stable waterproof performance. It was found that the composite emulsion could form a hydrophobic layer with a certain thickness inside the cement-based material, which explains why the composite emulsion had a good waterproof effect.

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Enhancements and mechanisms of nanoparticles on wear resistance and chloride penetration resistance of reactive powder concrete

Cited by 42 publications

References 20 publications

TiO2-based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, and Assessment Techniques

TiO2-based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, and Assessment Techniques

The Influence of a Novel Hydrophobic Agent on the Internal Defect and Multi-Scale Pore Structure of Concrete

Influence of a New Type of Graphene Oxide/Silane Composite Emulsion on the Permeability Resistance of Damaged Concrete

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