Emulsion cold mix asphalt in the UK: A decade of site and laboratory experience

Day, D T; Lancaster, Ian; McKay, Dougie

doi:10.1016/j.jtte.2019.05.002

Cited by 23 publications

(11 citation statements)

References 6 publications

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“…In addition, emulsions were diluted and observed under a microscope to determine the size of the droplets (example shown in Figure b) with DP10 cardanol). At the end, the size distribution was quite narrow for the three samples, and droplet averages of 15 μm were obtained in accordance with the expectation . DP10 C16 was stable for less than 5 min despite 15% DS, and DP10 C9 was stable for 1 h. The most stable emulsions appeared to be those stabilized with DP10-cardanol presented in Figure with destabilization starting between 24 and 48 h. In this case, DS 8% represents 60% of oligomers grafted with one cardanol chain (Figure a and Supporting Information Figure SI 8 for the color code).…”

Section: Resultssupporting

confidence: 82%

“…Bitumen emulsions are composed of an oily phase composed of bitumen (40 to 80% (w/w)) and an aqueous phase (20 to 60% (w/w)) that contains a surfactant (between 0.1 and 2.5% (w/w)) , Bitumen is sheared through a colloid mill, and bitumen droplets of 1 to 20 μm are dispersed in the aqueous phase. Nowadays, bitumen emulsions are mainly cationic, meaning that they are stabilized by a cationic surfactant such as fatty amines, fatty amidoamines, fatty imidazolines, and fatty quaternary ammonium salts, which are often toxic …”

Section: Introductionmentioning

confidence: 99%

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Functionalization of Chitosan Oligomers: From Aliphatic Epoxide to Cardanol-Grafted Oligomers for Oil-in-Water Emulsions

et al. 2021

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Hydrophobically modified chitooligosaccharides (COS) were tested for suitability as an emulsifier in cationic bituminous emulsions. COS of polymerization degree (DP) 5, 10, 15 and 20 were obtained by nitrous acid deamination. A complete study on depolymerization and precise product and side product characterization was led upstream. Chemical modification of COS was performed to reach amphiphilic structures using three fatty epoxide with growing chain length (Butyl (C4), octadecyl (C9) and hexadecyl glycidyl ether (C16)). The grafting efficiency according to reaction conditions were established.Different substitution degrees (DS) were obtained by modulating the ratio of fatty epoxy/NH 2 . It was shown that after a certain DS, the oligomers thus formed were not watersoluble anymore. At the end, cardanol glycidyl ether was grafted on DP 5, 10 and 15 COS, cardanol being a biobased compound extracted from cashew nut shell, this reaction led to a potentially fully biobased structure. Water-soluble candidates with higher DS were used as surfactant to emulsify motor oil as a simulation of bitumen. Cardanol-chitosan based surfactant led to direct oil in water emulsion (60/40 w/w) formed of particles of 15 µm average that were stable at least for 24 h.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Functionalization of Chitosan Oligomers: From Aliphatic Epoxide to Cardanol-Grafted Oligomers for Oil-in-Water Emulsions

et al. 2021

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“…Bitumen emulsions are composed of an oily phase composed of bitumen (40 to 80% (w/w)) and an aqueous phase (20 to 60% (w/w)) that contains a surfactant (liquid or powder, between 0.1 and 2.5% (w/w)) [28] [29]. The bitumen is sheared through a colloid mill to disperse bitumen droplets of 1 to 20 µm in the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

Surfactant properties of chemically modified chitooligosaccharides and their potential application in bitumen emulsions

Chapelle

David

Caillol

et al. 2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…No entanto, estudos recentes vêm demonstrando o potencial deste tipo de mistura para ser utilizada como uma solução permanente. DAY et al [5] apresentam resultados de dez anos de experiências de campo e laboratório na Europa, os quais demonstram sucesso da utilização de misturas a frio em pavimentos de regiões de tráfego elevado no Reino Unido. Ainda segundo os autores, o sucesso no controle laboratorial implementado, em conjunto com o desenvolvimento contínuo das especificações, lançou as bases para a adoção mais ampla de soluções em PMF em pavimentos no País.…”

Section: Introductionunclassified

Efeito do tempo de estocagem no comportamento mecânico de mistura asfáltica a frio produzida em usina de pequeno porte

et al. 2021

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RESUMO Parte considerável da malha rodoviária brasileira se concentra em regiões de baixo volume de tráfego, nas quais pavimentar e manter os revestimentos asfálticos existentes em condições mínimas de trafegabilidade é um desafio constante. Neste contexto, os Pré Misturados a Frio (PMF) se destacam como soluções adequadas para suprir a demanda por misturas asfálticas nesses locais. O presente trabalho teve como objetivo avaliar o comportamento mecânico de uma mistura asfáltica fabricada em usina de pequeno porte, ao longo do tempo de estocagem da mistura. Inicialmente foi estabelecido um projeto de dosagem de PMF denso em laboratório para fornecer os parâmetros necessários à produção e controle da mistura fabricada na usina. De posse do projeto foram produzidos cerca de 360 kg de mistura para realização de testes de estabilidade, fluência, Resistência à Tração por compressão diametral (RT), além da obtenção de parâmetros volumétricos de amostras compactadas após 1, 7, 15, 30 e 60 dias de fabricação. Os resultados demonstraram haver relação entre o tempo de estocagem da mistura e os diferentes parâmetros analisados, ou seja, a perda de umidade no armazenamento proporcionou enrijecimento da mistura, menores densidades das amostras compactadas com consequente aumento dos vazios dos corpos de prova, associado a queda de resistência e deformabilidade.

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Emulsion cold mix asphalt in the UK: A decade of site and laboratory experience

Cited by 23 publications

References 6 publications

Functionalization of Chitosan Oligomers: From Aliphatic Epoxide to Cardanol-Grafted Oligomers for Oil-in-Water Emulsions

Functionalization of Chitosan Oligomers: From Aliphatic Epoxide to Cardanol-Grafted Oligomers for Oil-in-Water Emulsions

Surfactant properties of chemically modified chitooligosaccharides and their potential application in bitumen emulsions

Efeito do tempo de estocagem no comportamento mecânico de mistura asfáltica a frio produzida em usina de pequeno porte

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