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Influence of Constituents on the Evolutionary Response of Bitumen-Stabilized Material.

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Title: Influence of Constituents on the Evolutionary Response of Bitumen-Stabilized Material.
Authors: Saha, Shubhadeep1 (AUTHOR) 22te06005@iitbbs.ac.in, Kumar, Rahul2 (AUTHOR) a22ce09018@iitbbs.ac.in, Behera, Atanu3 (AUTHOR) atanu.behera77@gmail.com, Sahoo, U. C.4 (AUTHOR) ucsahoo@iitbbs.ac.in
Source: Journal of Materials in Civil Engineering. Feb2025, Vol. 38 Issue 2, p1-12. 12p.
Subjects: Cement, Bituminous materials, Road construction, Asphalt emulsion mixtures, Particle size distribution, Mechanical behavior of materials, Tensile strength
Abstract: Bitumen-stabilized material (BSM) consists of aggregates, bitumen emulsion or foamed bitumen, cement, and water in specific proportions. It enhances the mechanical properties of unbound granular materials to serve as a stronger base course in the pavement structure. It is understood that the mechanical behavior of BSM evolves with time because of distinct constituent materials and their complex interactions. This study investigates the effects of bitumen emulsion content, cement, and curing duration on the volumetric and mechanical properties of BSM prepared with two different gradations as recommended by the Asphalt Academy (TG2) with nominal maximum aggregate size (NMAS) 26.5 and Austroads with NMAS 19.0 mm. Laboratory tests and statistical analysis examined the moisture loss, air voids, and indirect tensile strength (ITS) of BSM. Results indicate that combining cement and bitumen emulsion significantly improves ITS by reducing moisture loss and air voids. Being the coarser gradation, TG2 performed better with cement because of the enhanced hydration, whereas the relatively finer Austroads gradation resulted in higher ITS without cement because of better compaction and adhesion. Without cement, all the mixtures resulted in lower strength than the recommended minimum ITS of 225 kPa, highlighting cement's critical role in strength development. Further, it was established that the Michaelis–Menten (MM) reaction kinetic model effectively describes curing behavior, predicting the curing rate, theoretical maximum strength, and minimum curing time. These findings presented in this paper provide practical insights for optimizing BSM mix designs by balancing emulsion content, cement dosage, and aggregate gradation. Practical Applications: Bitumen-stabilized materials (BSM) offer a cost-effective and sustainable approach to road construction by improving the strength and durability of pavement base layers. However, optimizing their composition and curing process is essential to maximize performance. This study examines how bitumen emulsion content, cement addition, and curing time influence the volumetric and strength properties of BSM. Laboratory testing reveals that combining cement with bitumen emulsion significantly enhances strength by reducing moisture loss and air voids. The results also show that aggregate gradation affects performance—coarser gradations benefit more from cement because of enhanced hydration, while finer gradations achieve higher strength through better compaction. Importantly, without cement, the mixtures fail to meet the minimum strength requirements, highlighting its crucial role in durability. Additionally, the study captures how volumetric properties and strength evolve over time, demonstrating that curing plays a vital role in achieving optimal performance. A reaction-based model is introduced to predict the curing behavior, helping engineers optimize mix designs for efficient construction. These insights provide practical guidance for road engineers and transportation agencies, enabling the design of more durable and long-lasting roads. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Bitumen-stabilized material (BSM) consists of aggregates, bitumen emulsion or foamed bitumen, cement, and water in specific proportions. It enhances the mechanical properties of unbound granular materials to serve as a stronger base course in the pavement structure. It is understood that the mechanical behavior of BSM evolves with time because of distinct constituent materials and their complex interactions. This study investigates the effects of bitumen emulsion content, cement, and curing duration on the volumetric and mechanical properties of BSM prepared with two different gradations as recommended by the Asphalt Academy (TG2) with nominal maximum aggregate size (NMAS) 26.5 and Austroads with NMAS 19.0 mm. Laboratory tests and statistical analysis examined the moisture loss, air voids, and indirect tensile strength (ITS) of BSM. Results indicate that combining cement and bitumen emulsion significantly improves ITS by reducing moisture loss and air voids. Being the coarser gradation, TG2 performed better with cement because of the enhanced hydration, whereas the relatively finer Austroads gradation resulted in higher ITS without cement because of better compaction and adhesion. Without cement, all the mixtures resulted in lower strength than the recommended minimum ITS of 225 kPa, highlighting cement's critical role in strength development. Further, it was established that the Michaelis–Menten (MM) reaction kinetic model effectively describes curing behavior, predicting the curing rate, theoretical maximum strength, and minimum curing time. These findings presented in this paper provide practical insights for optimizing BSM mix designs by balancing emulsion content, cement dosage, and aggregate gradation. Practical Applications: Bitumen-stabilized materials (BSM) offer a cost-effective and sustainable approach to road construction by improving the strength and durability of pavement base layers. However, optimizing their composition and curing process is essential to maximize performance. This study examines how bitumen emulsion content, cement addition, and curing time influence the volumetric and strength properties of BSM. Laboratory testing reveals that combining cement with bitumen emulsion significantly enhances strength by reducing moisture loss and air voids. The results also show that aggregate gradation affects performance—coarser gradations benefit more from cement because of enhanced hydration, while finer gradations achieve higher strength through better compaction. Importantly, without cement, the mixtures fail to meet the minimum strength requirements, highlighting its crucial role in durability. Additionally, the study captures how volumetric properties and strength evolve over time, demonstrating that curing plays a vital role in achieving optimal performance. A reaction-based model is introduced to predict the curing behavior, helping engineers optimize mix designs for efficient construction. These insights provide practical guidance for road engineers and transportation agencies, enabling the design of more durable and long-lasting roads. [ABSTRACT FROM AUTHOR]
ISSN:08991561
DOI:10.1061/JMCEE7.MTENG-21486