Concrete protection by combined hygroscopic and hydrophilic crystallization waterproofing applied to fresh concrete

Al-Rashed, Radi; Al-Jabari, Maher

doi:10.1016/j.cscm.2021.e00635

Cited by 15 publications

(3 citation statements)

References 32 publications

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“…For existing concrete structures, researchers have developed solutions such as different products, chemical bases and commercial systems to apply on concrete surfaces as waterproofing barrier systems. These products and systems include emulsions, acrylic membranes, asphalt blankets, polymeric mortars (2), liquid-applied films or sheets made of acrylic resins, bitumen, styrene-butadiene-styrene copolymer, ethylene propylene diene monomer (EPDM), acrylics, polyethylene; silane, siloxane (3) and silicone (4) and, more recently, crystallizing hydrophobic minerals (5), dual-crystallization (DCE) (6, 1) and multi-crystallization technology (7,8) with hygroscopic and hydrophilic characteristics. On the other hand, in new concrete structures, solutions involve a concrete mix design using supplementary cementitious materials such as metakaolin, silica fume, nano-silica, fly ash (9,10), nano metakaolin (11), rice husk ash and waste glass (12) or super absorbent polymers (SAPs) (13,14).…”

Section: Introductionmentioning

confidence: 99%

Influence of crystallizing type chemical admixture on precast micro concretes: a statistical analysis and holistic engineering overview

Lopes,

Bacarji,

Bacarji

et al. 2024

Mater. constr.

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The aim of this paper is to evaluate the influence of a crystallizing chemical admixture on precast micro concretes with two water contents (7% and 11%, by dried mass) and two different conditions of exposure. Thus, precast micro concretes with a composition of 1:3 (cement: fines) with and without crystalline chemical admixture were evaluated on compressive strength (at the age of 28 and 154 days) and water absorption by immersion (at the age of 154 days). Statistical analysis showed that the only significant factor was the effect of the water content on the compressive strength. Besides that, the most significant factors for the water absorption and voids index properties were the water content, followed by the exposure conditions, and the interaction between the water content and the presence of the chemical admixture. The crystalline admixture was insignificant in the conditions of this research.

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Section: Introductionmentioning

confidence: 99%

Influence of crystallizing type chemical admixture on precast micro concretes: a statistical analysis and holistic engineering overview

Lopes,

Bacarji,

Bacarji

et al. 2024

Mater. constr.

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“…There are two ways to reduce the contact of alkaline active ingredients with water: 1) improve the waterproofness of concrete; 2) improve the waterproofness of aggregates. The use of surface protection systems to improve the water resistance of concrete is a research hotspot [14][15][16][17]. Surface protection systems are harmonized by European standards, especially EN 1504-2 [18] which include moisture control (MC) and increasing resistivity (IR), these two are closely related.…”

Section: Introductionmentioning

confidence: 99%

Exploration of Waterproofness of Concrete and Alkali-Aggregate Using Hydrophobic Impregnation and Coating

Kang¹,

Yuan²,

Liu³

et al. 2022

Journal of Renewable Materials

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Part of the tunnel spoil can not be used for concrete due to alkali-aggregate reaction (AAR). Water is an indispensable condition for AAR, so separating the alkali-aggregate from water is of great benefit to controlling the AAR. This paper investigates the modification of concrete and aggregate by hydrophobic impregnation and organic coating and then evaluates their waterproof and mechanical properties by dynamic contact angle (DCA), ultrasonic wave velocity, scanning electron microscope (SEM), nuclear magnetic resonance (NMR), and so on. For waterproofness, hydrophobic impregnation and organic coating can both improve the waterproofness of concrete and aggregate. The organic coating is suitable for aggregate because it wrap aggregate well. And aggregate coated by PVA can improve the interfacial transition zone (ITZ). For mechanical properties, both materials will weaken the strength of the interface. Furthermore, concrete made by aggregate with organic coating shows plastic deformation and has a good correlation with the film thickness, a plastic estimation model based on film thickness is proposed. This paper evaluates the waterproof of concrete and aggregate and finds plastic concrete with good aggregate waterproofness which provides a new idea for the application of alkali-aggregate in seepage control facilities of water conservancy projects.

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“…The flexible waterproof materials have the characteristics of flexibility and high durability, meanwhile, they are weak at adhesion. Rigid cementitious waterproofing materials are frequently employed; however, most hard cementitious waterproof materials are surface-sealing waterproofing agents [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Ameliorating the Mechanical Parameters, Thermal Stability, and Wettability of Acrylic Polymer by Cement Filling for High-Efficiency Waterproofing

et al. 2022

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Acrylic polymer/cement nanocomposites in dark and light colors have been developed for coating floors and swimming pools. This work aims to emphasize the effect of cement filling on the mechanical parameters, thermal stability, and wettability of acrylic polymer. The preparation was carried out using the casting method from acrylic polymer coating solution, which was added to cement nanoparticles (65 nm) with weight concentrations of (0, 1, 2, 4, and 8 wt%) to achieve high-quality specifications and good adhesion. Maximum impact strength and Hardness shore A were observed at cement ratios of 2 wt% and 4 wt%, respectively. Changing the filling ratio has a significant effect on the strain of the nanocomposites. The contact angle was increased as the concentration of additives and cement increased, indicating that the synthesized coating is not hydrophilic and does not allow water permeability through it. The results show that the acrylic polymer/cement with a cement ratio of 8 wt% is the best nanocomposite for high-efficiency waterproofing.

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Concrete protection by combined hygroscopic and hydrophilic crystallization waterproofing applied to fresh concrete

Cited by 15 publications

References 32 publications

Influence of crystallizing type chemical admixture on precast micro concretes: a statistical analysis and holistic engineering overview

Influence of crystallizing type chemical admixture on precast micro concretes: a statistical analysis and holistic engineering overview

Exploration of Waterproofness of Concrete and Alkali-Aggregate Using Hydrophobic Impregnation and Coating

Ameliorating the Mechanical Parameters, Thermal Stability, and Wettability of Acrylic Polymer by Cement Filling for High-Efficiency Waterproofing

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