Surface Modification of Cured Cement Pastes by Silane Coupling Agents

Stewart, Andrew; Schlosser, Brett; Douglas, Elliot P.

doi:10.1021/am301967v

Cited by 82 publications

(31 citation statements)

References 34 publications

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“…Recently, several authors have indicated the relevant role of the hydrogen bridge bonding in the mechanism of the surface modification of concrete [38][39][40], in our case, we suggest that the large hydroxyl groups of chitin can modify the mechanical properties of the cementitious materials. In a water or sulfate environment, this can be appreciated physically in the samples' morphology (Table 1) where the RMS roughness of the cements powders with chitin present lower values than the control samples (cements without chitin); we find the nonlinearity of the Young's modulus in function of the chitin concentration.…”

Section: Infrared and Raman Spectrasupporting

confidence: 57%

Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy

Ortega

Rodríguez

Figueroa-Labastida

et al. 2016

Phys. Status Solidi A

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The presence of sulfates potentialize damage on cementbased materials, leading to structural failures. Therefore, structures must be designed to compensate for this effect. The mechanical properties of cement-chitin mixtures are investigated with different percentages of chitin (0.5, 1.3, and 2.1 wt.%) and aging of composite in a joint nanoscopic-and macroscopic-scale by experimental study. The objective is to increase the durability of concrete elements at coastal aquifers where concrete structures are in constant exposure to sulfate ions, chloride ions among others. Tapping mode AFM was used to characterize the surface structure and roughness of the cement pastes. To verify the chitin addition and the formation of sulfate-based aggregates Raman and IR spectra were recorded and are presented in this work. Then, force spectroscopy was used to obtain the nanomechanical properties at three different exposure times (1 day, 6 months, and 1 year) into water or a SO 4 À2 environment. Macroscopic parameters (e.g., compression strength of cylindrical probes) were assessed for comparison following standard guidelines. The results show a decrease of its mechanical properties as a function of the polymer concentration but more importantly, they correlate the elasticity and adhesion at the nanoscale with the behavior of the bulk material.

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Section: Infrared and Raman Spectrasupporting

confidence: 57%

Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy

Ortega

Rodríguez

Figueroa-Labastida

et al. 2016

Phys. Status Solidi A

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“…[14][15][16][17] Among commonly used coupling agents, silane coupling agents have been used to improve environmental durability of the epoxy/metal and epoxy/cement interfaces in recent years. [18][19][20] Silane coupling agents usually contains an organofunctional group (Y) and alkoxy function group (OR), which can react with an inorganic (e.g., cement) through hydrolysis and condensation. Several studies of applying silane coupling agents to cement are reviewed herein.…”

Section: Introductionmentioning

confidence: 99%

“…The results demonstrated that the concrete treated by the hydrophobic agent led to increase in its water impermeability. 25,26 Furthermore, Stewart et al 20 investigated the interaction between silane coupling agents and cured cement paste using X-ray photoelectron spectroscopy and static contact angle measurements. Their results conrmed the formation of a covalent bond between the cement paste and silane.…”

Section: Introductionmentioning

confidence: 99%

A cement paste–tail sealant interface modified with a silane coupling agent for enhancing waterproofing performance in a concrete lining system

Yang

Tao

et al. 2019

RSC Adv.

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Although hydrophobic surface coating of concrete is currently used to enhance waterproofing performance of underground structures, the chemical and mechanical incompatibility between an inorganic cement and organic coating makes it a challenge to ensure long-term waterproofing properties of underground facilities, especially for tunnel lining systems. This study explores the feasibility of using a silane coupling agent to improve compatibility between the cement and tail sealant interface, which aims to reduce the water leakage risk of lining systems. The enhanced waterproofing performance of the cement-tail sealant interface modified with the silane agent was confirmed by its hydrophobicity (i.e. reduced wetting ability) and reduced permeability, which was evaluated by static water-contact angle and impermeability pressure measurements. The processes underlying the enhanced waterproofing performance of the cement-tail sealant interface were revealed by chemical bonding, microstructure and porosity characterization. Fourier transform infrared spectroscopy (FTIR) results of the cement-tail sealant interface confirm the reactions between the silane agent and cement hydration products, while both microstructure and porosity results reveal that the cement-tail sealant interface is denser and less porous, relative to the control cement grout.Conventional tail sealant was used as the base material in this study, which is composed of hydraulic uid, polyisobutylene, cotton ber and active calcium carbonate. Among these ingredients, hydraulic uid and polyisobutylene act as base oil and Fig. 1 (a) Schematic illustration of how a tail shield is applied on the surface of linings, (b) a sketch map of transverse section of a tunnel lining system and (c) a picture of a typical cross-section of a tunnel lining system. 7166 | RSC Adv., 2019, 9, 7165-7175 This journal is

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“…The addition of polymers can improve the fluidity and rheological property of concrete and reduce its brittleness [5][6][7][8]. Polymers can also be used to repair concrete cracks and protect concrete from corrosion [9][10][11]. However, because the cement is not compatible with polymer, the improvement is limited [12,13].…”

Section: Introductionmentioning

confidence: 99%

Organic/inorganic dual network formed by epoxy and cement

Zhang

Zhu

et al. 2018

Polymer Composites

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Organics generally does not form network with inorganics because of their poor compatibility. Here, we report organic/inorganic dual network (DN) formed by epoxy and high alumina cement. In the presence of water, the cement quickly forms inorganic network via hydration followed by the gradual curing of epoxy yielding the organic network interpenetrating with the former. Such DN has improved mechanical properties either at early or final stage in comparison with the cement or epoxy after curing. It also exhibits high bonding strength with concrete so that it can be used to repair concrete cracks and blocking water leakage. The novel organic/inorganic DN is expected to find applications in constructional and geotechnical engineering. POLYM. COMPOS., 39:E2490–E2496, 2018. © 2018 Society of Plastics Engineers

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Surface Modification of Cured Cement Pastes by Silane Coupling Agents

Cited by 82 publications

References 34 publications

Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy

Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy

A cement paste–tail sealant interface modified with a silane coupling agent for enhancing waterproofing performance in a concrete lining system

Organic/inorganic dual network formed by epoxy and cement

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