The College of Engineering / University of Nahrain in the Department of Civil Engineering discussed the doctoral thesis of the researcher Ahmed Maher Mohammed, entitled, ((Evaluation of the direct and indirect tensile strength of the hot asphalt concrete mixture enhanced with nanomaterials)), under the supervision of Professor Dr. Alaa Abdul Hussein, Assistant President of the University for Administrative Affairs.

The thesis came in order to evaluate the direct and indirect tensile strength of the hot asphalt concrete mixture enhanced with nanomaterials, and the laboratory work included ...

- Adding three different types of nanomaterials, namely (nano silica, nano titanium, and nano calcium carbonate) added at a rate of -1,3,5% of the weight of the reference bitumen, with a performance grade of (64 - 16) 𝖯𝖦.

-The physical and rheological properties of the improved nano-bitumen were evaluated by selecting the rotational viscometer (𝖱𝖵), dynamic shear meter (𝖣𝖲𝖱), bending threshold (𝖡𝖡𝖱), aging (𝖱𝖳𝖥𝖮), and the effect of aging of bitumen under pressure (𝖯𝖠𝖵), in order to obtain the appropriate nano-material content, and the potential benefit of each nano-type.

-The study showed a decreasing trend in the sensitivity of asphalt temperature in both penetration and ductility values, in contrast, the ductility focus and penetration index increased, compared to the reference asphalt.

Note that the viscosity level in the improved nanomaterials reaches 5% by adopting silica and titanium at 135 ° C, to approximately 60% compared to the reference bitumen.

Followed by calcium carbonate, with an increase in viscosity to 43%, as confirmed by the results of the test (𝖱𝖳𝖥𝖮) with 5% silica and titanium, thus meeting the requirements specifications at 85 and 76 ° C, respectively.

The thesis reached the confirmation of these results, through the overall desirability (𝖮𝖣), and the nano ratio of 5 showed the highest effect on the properties of bitumen with silica, followed by titanium, and finally calcium carbonate, which will be used as an ideal value to verify the potential benefit, in the hot asphalt mixture (𝖧𝖬𝖠).