Sustainable Modeling of Water Retention Curve for Cement Cold Asphalt Mixtures

Saadoon, T, Dulaimi, A, Ghiassi, B and Al Nageim, H (2025) Sustainable Modeling of Water Retention Curve for Cement Cold Asphalt Mixtures. In: IOP Conference Series: Earth and Environmental Science , 1507 (1). 012067-012067. (5th International Conference on Sustainable Engineering Techniques (ICSET24), 11th Dec - 12th Dec 2024, Baghdad, Iraq).

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Abstract

Cold Asphalt Mixture (CA) is one of asphalt types which used in pavement. It is manufactured with water, bitumen emulsion, aggregate and sometime cementitious materials. This type of asphalt involves economic, safety, health, and environmental benefits compared to other paving materials. However, it is restricted to using as a structural layer due to weak performance especially at first ages. Trapped water inside CA at early curing stages is the reason behind this weak performance. This research aims to investigate the effect of the bitumen emulsion and cementitious materials on the capillarity and water retention curve (WRC) of CA (with and without cementitious materials). With this objective, the effect the bitumen emulsion and cementitious materials was assessed from the point of view of water evaporation and specifically the head capillarity of WRC. With this purpose, WRC was calculated for unbound materials (aggregate) and CA. Depending on the results of experimental tests (hydraulic conductivity tests), the WRC was theoretically predicted by using results of the pore size distribution index (sizes and structure of voids) which was calculated depending on the hydraulic conductivity tests. The results showed that the pore size distribution index (n) have a significant link with the hydraulic conductivity. Compared to unbound materials, the bitumen emulsion increased the hydraulic conductivity of CA, as a result, n. The cementitious materials have not significant effect on the n of the CA. There is a significant positive relationship between n and the capillarity, as a result, WRC too. Therefore, the bitumen emulsion reduce the curing capacity of CA by decreasing its capillarity. As a result, the time of drying increase. Finally, cementitious materials do not significantly contribute to increase the capillarity of CM.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	30 Agricultural, veterinary and food sciences; 37 Earth sciences; 41 Environmental sciences
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TE Highway engineering. Roads and pavements
Divisions:	Civil Engineering and Built Environment
Publisher:	IOP Publishing
Date of acceptance:	1 June 2025
Date of first compliant Open Access:	13 June 2025
Date Deposited:	13 Jun 2025 09:02
Last Modified:	13 Jun 2025 09:02
DOI or ID number:	10.1088/1755-1315/1507/1/012067
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26578

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