Control of water absorption in concrete materials by modification with hybrid hydrophobic silica particles

Mora, Ernesto; González, Guillermo Íñiguez; Romero, Pedro; Castellón, Erick

doi:10.1016/j.conbuildmat.2019.06.086

Cited by 48 publications

(20 citation statements)

References 33 publications

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“…In the case of similar coarse aggregate properties, the mechanical properties of concrete materials are directly bound up with the microscopic characteristics (different pore types, various pore sizes, and micro-defects) of the mortar matrix [ 9 , 26 , 27 , 28 , 29 ]. It is generally accepted that the most variable section of concrete materials is the mortar matrix, which is also named the concrete matrix surrounded by the coarse aggregates [ 30 ]. Hydrophobic admixtures usually have hydrophobic functional groups in chemical composition or in the products of chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Chloride diffusion coefficient is a key parameter of concrete that closely relates with rebar depassivation. Traditionally, many approaches have been applied to decrease the chloride diffusivity of cement-based materials or increase the time of rebar depassivation, including lowering the water-cement ratio of the concrete, replacing cement with mineral admixtures [2], expanding the thickness of cover, and using some nanomaterials [3][4][5][6] and polymers [7][8][9][10][11]. Besides, there are other methods to improve the durability of the concrete structures: for example, Yu et al [12] applied bidirectional electromigration rehabilitation technology to improve the durability of chloride-contaminated concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Novel Nano-Precursor Inhibiting Material for Improving Chloride Penetration Resistance of Concrete: Evaluation and Mechanism

Chen

Liu

et al. 2021

Materials

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Durability improvement is always important for steel–concrete structures exposed to chloride salt environment. The present research investigated the influence of a novel nano-precursor inhibiting material (NPI), organic carboxylic acid ammonium salt, on the mechanical and transport properties of concrete. The NPI caused a slight reduction in the strength of concrete at later ages. NPI significantly decreased water absorption and slowed down the speed of water absorption of concrete. In addition, the NPI decreased the charge passed and the chloride migration coefficient, and the results of the natural chloride diffusion showed that the NPI decreased the chloride concentration and the chloride diffusion coefficient. The NPI effectively improved the resistance of chloride penetration into testing concrete. The improvement in the impermeability of concrete was ascribed to the incorporation with the NPI, which resulted in increasing the contact angle of cement pastes. The contact angle went up from 17.8° to 85.8° for 0% and 1.2% NPI, respectively, and cement pastes became less hydrophilic. Some small pore throats were unconnected. Besides, the NPI also optimized the pore size distribution of hardened cement paste.

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“…The induction of hydrophobicity in concrete materials has become a current trend in construction engineering [24][25][26][27]. Hydrophobic concrete is a promising material through its repellency of water and minimum flow of water through the material, thereby bestowing an enhanced durability [1,5,15,28,29].…”

Section: Introductionmentioning

confidence: 99%

Anti-adherent Molds Yield Hydraulic Concrete Samples Suitable for Assessments of Surface and Water Absorption

Mora¹,

Castellón²

2021

J. Civ. Eng. Constr.

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To assess several quality parameters of hydraulic concrete, cubic samples of this material are commonly assembled in engineering laboratories using molds. It is ubiquitous the use of cubic metallic molds of volume 125 cm3; these molds require the application of demolding substances (such as oils) on their surfaces to avoid the adhesion of the final hardened concrete sample to the molds. Despite this common practice suitable for evaluating mechanical traits of the materials, the use of a demolding agent spoils the concrete samples for the assessment of surface and water absorption parameters. To overcome this difficulty, we propose a new anti-adherent cubic mold that requires no demolding agent. The construction of the new mold based on anti-adherent polytetrafluoroethene (PTFE, Teflon®) is described with its use. To assess the claimed advantages of the new anti-adherent molds in testing surface and water diffusion traits of concrete samples, experiments on water contact angles, rates of water absorption and drying were performed on concrete specimens obtained with the classic and the new PTFE molds. It was proved the advantage of the anti-adherent mold over common metallic molds. The use of an oil as demolding agent in the concrete samples assembled in metallic molds produced conspicuous differences of water contact angles and absorption in comparison to clean concrete samples produced with PTFE molds.

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Control of water absorption in concrete materials by modification with hybrid hydrophobic silica particles

Cited by 48 publications

References 33 publications

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

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

Novel Nano-Precursor Inhibiting Material for Improving Chloride Penetration Resistance of Concrete: Evaluation and Mechanism

Anti-adherent Molds Yield Hydraulic Concrete Samples Suitable for Assessments of Surface and Water Absorption

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