Effects of Surfactants on the Properties of Mortar Containing Styrene/Methacrylate Superplasticizer

Negim, El‐Sayed; Кожамжарова, Л С; Khatib, Jamal; Bekbayeva, Lyazzat; Williams, Craig D.

doi:10.1155/2014/942978

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…PVA, as an anionic action of surfactant, consists of a hydrophobic backbone and a hydrophilic end. The negative charged hydrophobic end can attach on the surface of cement particles with positive charge due to the electrostatic attraction, which benefits to reduce the surface tension and generate stable bubbles in cement matrix, as shown in Figure . Due to the moderate surfactant properties and viscoelasticity of PVA, air bubbles in the cement matrix are hardly to be removed, which can increase the porosity and improve the thermal insulation property of cement paste.…”

Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

Lu¹,

Hanif

et al. 2017

J of Applied Polymer Sci

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This study aimed to investigate the effect of poly(vinyl alcohol) (PVA) polymer on the thermal, mechanical, and surface properties on cementitious composites for sustainable development. Thermal properties of the PVA-modified cement paste, including thermal insulation and energy absorption ability, were first studied and correlated with the porosity and microstructures. The experimental results indicated that the thermal conductivity of cement paste can be greatly reduced by 42.9% with 2.0 wt % addition of PVA due to the more porous structure. However, at the same time, more thermal energy can be captured and concentrated at the surface of cement paste with the increasing amount of PVA, causing an increased thermal load and a negative effect on thermal insulating efficiency of cement paste. The contradictory effect of PVA on thermal properties of cement paste should be balanced before it is used as a foaming modifier to fabricate cementitious composites with thermal insulation. In addition, the contact angle measurement revealed that PVA can be used as an effective additive to improve the hydrophobicity of cement-based materials. Only 3.0% PVA can turn the surface nature from hydrophilicity to hydrophobicity for cement paste, which benefited to the development of self-cleaning cementitious composites. Finally, the mechanical properties of the PVA-modified cement paste, especially for the tensile strength that has been rarely reported, were investigated and correlated with its thermal and surface properties. Due to the compensative effects of irregular packing, formation of PVA films and microcracks, tensile strength of cement paste can be improved by 23.5% with a small scarifying of the compressive strength by adding 2.0% of PVA. In conclusion, the PVA-modified cement-based materials with lower thermal conductivity, hydrophobic surface nature and enhanced mechanical properties have a great potential to satisfy the high requirements in developing sustainable infrastructure.

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Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

Lu¹,

Hanif

et al. 2017

J of Applied Polymer Sci

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“…The increase in air content values of L-arginine-containing cement mortar is due to the increase in the interfacial effect between non-hydrated cement particles and L-arginine. L-arginine acts as an acid-base cationic surfactant where it reduces the surface tension and allows the formation of stable bubbles [42][43][44][45] on the surface of the cement and sand particles. Thus, flow and air content are increased with addition of L-arginine in cement mortar.…”

Section: Flow/slump and Air Content Of Fresh Cement Mortarmentioning

confidence: 99%

L-Arginine-Incorporated Cement Mortar as Sustainable Artificial Reefs

et al. 2020

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L-arginine is one of the amino acids found in plant seeds. In the present study, various amounts (i.e., 3%, 5%, 10%) of L-arginine were added to cement mortar to investigate the compressive strength, workability, leaching behavior, and pH change in distilled and natural seawater, as well as dissolved nitrogen and growth of chlorophyll-a (Chl-a) by immersion in natural seawater. The compressive strength of the cement mortar is decreased with increase in L-arginine content owing to the high flow/slump and air content. A concentration of 10% L-arginine significantly promoted the growth of Chl-a on the cement mortar for up to 56 days of immersion in natural seawater. This is due to the availability of high dissolved nitrogen and pH inside the pores. This study recommends the use of L-arginine in artificial reef structures where marine ecosystems can be maintained.

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“…Negim et al (2019) synthesized a copolymer by grafting 2-EHA on PVA using APS as a free-radical initiator and subsequently found that the properties of the cement improved with increasing the 2-EHA/grafted copolymer ratio. Negim et al (2014Negim et al ( , 2016 investigated the physico-mechanical properties of mortar containing the following cosurfactants: 2-wt.% dodecyl benzene sodium sulfonate (DBSS) and either 1.5-wt.% PVA or 1.5-wt.% polyoxyethylene glycol monomethyl ether (POE) as an air entraining agent. Additionally, the latex copolymers: styrene/butyl methacrylate (St/BuMA), styrene/methyl methacrylate (St/MMA), styrene/glycidyl methacrylate (St/GMA), and styrene/butyl acrylate (St/BuA) were prepared by emulsion in the presence of the abovementioned cosurfactants.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Poly(Polyvinyl Alcohol-g-2-Ethylhexyl Acrylate) as Admixture for Mortar

Bekbayeva¹,

Negim²,

Gulzhakhan³

et al. 2020

IJTech

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We investigated the physico-mechanical properties of mortar mixed with copolymers based on polyvinyl alcohol (PVA) and 2-ethylhexyl acrylate (2-EHA) and synthesized by grafting using ammonium persulfate (APS) as an initiator. Increasing the amount of 2-EHA in the copolymer from 4% to 8% reduced the water/cement (W/C) ratio, the initial and final setting times, and the water absorption of mortar, while it increased its compressive strength.

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Effects of Surfactants on the Properties of Mortar Containing Styrene/Methacrylate Superplasticizer

Cited by 12 publications

References 36 publications

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

L-Arginine-Incorporated Cement Mortar as Sustainable Artificial Reefs

Utilization of Poly(Polyvinyl Alcohol-g-2-Ethylhexyl Acrylate) as Admixture for Mortar

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