This paper examines the structural, workability, physical and mechanical properties of (mass concrete) with the inclusion of microcapsule of Zinc oxide (ZnOMC) with a size (0.5) µm and in different percentages (0, 0.5, 1 and 1.5) % of cement weight. The proportions of the concrete mixture were (1:2:4.8) and the water-cement ratio (W/C) was 0.4. 0.6% of Superplasticizer (SP) by weight of cement with all concrete mixtures was added. An SEM analysis employed to obtain a better view of the concrete behavior with ZnOMC. Referring to the analysis and discussion, it was found that the types of microcapsule used to have an effective effect on the compressive and flexural strength and mechanism of sealing the crack, also the highest percentage of microcapsule which there has a positive contribution towards mass concrete properties have been recorded.

Because cracks are the main problem of mass concrete, this paper investigates an experimental study on the effect of polypropylene microfiber (PPMFs) on self -repair behavior of mass concrete, through study the microstructure, workability, physical, and mechanical properties of mass concrete. PPMFs with a diameter of 18 µm add in different percentages (0, 0.5, 1 and 1.5) % of cement weight. Where the prepared mixture ratio was (1:2:4.8) and the water-cement ratio (W/C) was 0.4. Also, 0.6% of Superplasticizer (SP) % of cement weight to all concrete mixtures was added. In this study, an SEM analysis used to observe the effect of PPMFs on the microstructure of mass concrete, and compressive and flexural strength tests for study the mechanical properties of this. And referring to the analysis and discussion of the results, PPMFs used have changed the microstructure of mass concrete, and have an effective effect on improving compressive strength and flexural strength, and mechanism of sealing the cracks of concrete autogenously. Also, 1% PPMFs (% of cement weight) recorded as the highest addition, which has a positive effect on mass concrete properties to apply it in the construction field.

Because cracks are the main problem of mass concrete, this paper investigates an experimental study on the effect of polypropylene microfiber (PPMFs) on self -repair behavior of mass concrete, through study the microstructure, workability, physical, and mechanical properties of mass concrete. PPMFs with a diameter of 18 μm add in different percentages (0, 0.5, 1 and 1.5) % of cement weight. Where the prepared mixture ratio was (1:2:4.8) and the water-cement ratio (W/C) was 0.4. Also, 0.6% of Superplasticizer (SP) % of cement weight to all concrete mixtures was added. In this study, an SEM analysis used to observe the effect of PPMFs on microstructure of mass concrete, and compressive and flexural strength tests for study mechanical properties of this. And referring to the analysis and discussion of the results, PPMFs used have changed microstructure of mass concrete, and have an effective effect on improve compressive strength and flexural strength, and mechanism of sealing the cracks of concrete autogenously. Also, 1% PPMFs (% of cement weight) recorded as the highest addition, which has a positive effect on mass concrete properties to apply it in the construction field.