WASET
    Reza Keihani and  Ali Bahadori-Jahromi and  Timothy James Clacy,  Sustainable Development of Medium Strength Concrete Using Polypropylene as Aggregate Replacement.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 588 - 599
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10010763.