Strength, shrinkage, erodibility and capillary flow characteristics of cement-treated recycled pavement materials

Fedrigo, William; Núñez, Washington Peres; Kleinert, Thaís Radünz; Matuella, Matheus Ferreira; Ceratti, Jorge Augusto Pereira

doi:10.1016/j.ijprt.2017.06.001

Cited by 33 publications

(16 citation statements)

References 21 publications

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“…In [ 49 ], it was shown that cold recycled mix (CRM) achieved similar dry shrinkage values to cement stabilized macadam (CSM) mixes with only virgin aggregate. Higher cement content increases the dry shrinkage, which was also observed in [ 24 ]. As the temperature rises, the value of thermal shrinkage (TS) increases.…”

Section: Introductionsupporting

confidence: 78%

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Research on the Properties of Mineral–Cement Emulsion Mixtures Using Recycled Road Pavement Materials

2021

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The reduction in natural resources and aspects of environmental protection necessitate alternative uses of waste materials in the area of construction. Recycling is also observed in road construction where mineral–cement emulsion (MCE) mixtures are applied. The MCE mix is a conglomerate that can be used to make the base layer in road pavement structures. MCE mixes contain reclaimed asphalt from old, degraded road surfaces, aggregate improving the gradation, asphalt emulsion, and cement as a binder. The use of these ingredients, especially cement, can cause shrinkage and cracks in road layers. The article presents selected issues related to the problem of cracking in MCE mixtures. The authors of the study focused on reducing the cracking phenomenon in MCE mixes by using an innovative cement binder with recycled materials. The innovative cement binder based on dusty by-products from cement plants also contributes to the optimization of the recycling process in road surfaces. The research was carried out in the field of stiffness, fatigue life, crack resistance, and shrinkage analysis of mineral–cement emulsion mixes. It was found that it was possible to reduce the stiffness and the cracking in MCE mixes. The use of innovative binders will positively affect the durability of road pavements.

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Section: Introductionsupporting

confidence: 78%

“…Increasing the reclaimed asphalt pavement (RAP) content in the mix reduces the strength of the mixtures but has no significant effect on drying shrinkage, erosion susceptibility, and capillary flow characteristics [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Properties of Mineral–Cement Emulsion Mixtures Using Recycled Road Pavement Materials

2021

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“…sobre reciclagem com cimento (Fedrigo et al, 2016;2017b), foi determinado o índice de prio-EC importante ressaltar que muitos dos critérios adotados nesse trabalho se basearam na ex-periência e conhecimento dos autores, adquiridos durante o desenvolvimento de um amplo projeto de pesquisa acerca do assunto, no Laboratório de Pavimentação (LAPAV) da Universidade Federal do Rio Grande do Sul (UFRGS). Dessa maneira, pretende-se fornecer ao meio técnico um embasamento cientı&ico para emprego de ferramentas que auxiliam na dosagem dessas misturas.…”

Section: Procedimentos Metodológicosunclassified

“…Para os fatores controlaveis, foram indicados os intervalos de investigação interessantes para o estudo. São apresentados os nıveis &ixos adotados para os fatores mantidos constantes, de&inidos a partir de estudos realizados por Fedrigo et al (2017a;2017b), sendo que alguns deles já foram avaliados em mais nıveis. Ao desenvolver a matriz experimental, foi necessário limitar a quantidade de análises, concomitantemente com a necessidade de analisar o maior intervalo exequıvel.…”

Section: Planejamento Do Experimentounclassified

Aplicação da metodologia de projeto de experimentos na dosagem de misturas de reciclagem de pavimentos com adição de cimento

et al. 2019

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Nesse estudo foi verificada a aplicação da metodologia de projeto de experimentos na dosagem de misturas de reciclagem de pavimentos com adição de cimento. Adotou-se um método de dosagem que avalia propriedades mecânicas, volumétricas e de erodibilidade, e foram desenvolvidas todas as etapas que contemplam um projeto de experimentos. O planejamento possibilitou definir as variáveis que exercem maior influência nos resultados, de modo a estabelecer uma matriz experimental abrangente e reduzida. Na análise dos resultados foi possível quantificar o efeito dos fatores controláveis estudados (teor de cimento e porcentagem de fresado) em cada variável de resposta. A partir da otimização multivariada, obteve-se o ajuste ótimo dos fatores controláveis considerando todas as variáveis de resposta simultaneamente. A ferramenta adotada nesse trabalho se mostrou bastante eficiente, podendo ser amplamente empregada na otimização de processos, como é o caso da dosagem de misturas recicladas.

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“…e utilization of recycled asphalt pavement (RAP) in the cold recycling process of asphalt pavement possesses the dual benefits of saving energy and protecting the environment [1,2]. However, the application of RAP in asphalt mixture is highly limited due to the presence of the aged asphalt on the RAP surface [3,4], which can reduce the properties of cold recycled asphalt mixture.…”

Section: Introductionmentioning

confidence: 99%

Adhesion Improvement between RAP and Emulsified Asphalt by Modifying the Surface Characteristics of RAP

Wang

Guo

et al. 2020

Advances in Materials Science and Engineering

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Recycled asphalt pavement (RAP) can be used in highway engineering again by cold recycled technology. Due to the aged asphalt on the surface of RAP, some problems such as poor adhesion between emulsified asphalt and RAP and the low properties of emulsified asphalt recycling mixture are easy to occur. This work aims at analyzing the aging degree of asphalt from RAP surface and improving the poor adhesion between RAP and emulsified asphalt by modifying the surface characteristics of RAP. In this work, a new device was designed to delaminate off the asphalt on the surface of RAP. The aging degree of asphalt at different layers was studied then by physical properties and molecular weight distribution. Slurry of hydrated lime (Ca(OH)2) (S-Ca) and slurry of silane coupling agent (SCA) modified Ca(OH)2 (S-Si-Ca) were used to modify the asphalt on the surface of RAP, respectively. The adhesion between emulsified asphalt and RAP was studied by contact angle and boiling method. Results show that the asphalt on the RAP surface can be successfully stripped into four layers through the self-designed RAP delaminating and stripping device. The aging degree of asphalt wrapped around the surface of the RAP showed a tendency to be gradually severe from outside to inside. However, asphalt at the innermost layer (L4) shows abnormal situation due to the fact that the light components are absorbed by the aggregate. In addition, reasonable dosage of SCA is determined as 3.0% in Ca(OH)2 powder mass. Both S-Ca and S-Si-Ca can effectively reduce the contact angle and thus improve the adhesion between emulsified asphalt and RAP. Moreover, S-Si-Ca possesses the most obvious modification effect attributed to the formation of asphalt-SCA-Ca(OH)2 structure.

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Strength, shrinkage, erodibility and capillary flow characteristics of cement-treated recycled pavement materials

Cited by 33 publications

References 21 publications

Research on the Properties of Mineral–Cement Emulsion Mixtures Using Recycled Road Pavement Materials

Research on the Properties of Mineral–Cement Emulsion Mixtures Using Recycled Road Pavement Materials

Aplicação da metodologia de projeto de experimentos na dosagem de misturas de reciclagem de pavimentos com adição de cimento

Adhesion Improvement between RAP and Emulsified Asphalt by Modifying the Surface Characteristics of RAP

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