Aims: Produce a low environment impact concrete by recycling waste brick and waste marble. Background: Marble and brick wastes are produced as a byproduct during manufacture or cutting processes. These materials could be used as a substitution to cement in mortar and concrete to reduce its environmental impact. Objective: Study the performance of self-compacting mortar with marbles and brick powders at the fresh and hardened states. Methodology: It is an experimental investigation where two Blaine finenesses of marble and brick powders were used. Rheological and mechanical and the physical properties of the new composites were studied. Results: The results show that for optimal workability and compressive strength of SCM, the maximum percent of substitution must not exceed 5% for brick powder, whereas for marble powder it can reach up to 20% according to the fineness of powder. The incorporation of brick and marble powders separately decreases the shrinkage of SCM and the combination of both powders has a positive effect on its sorptivity coefficient and total shrinkage. Conclusion: Maximum 5% and 20% of respectively brick and marble powder are recommended for optimal properties of self-compacting mortar.

When providing care, to protect a part of the human body against resins and plas ters for certain time, it is necessary to use a circular knitted band in cotton as a raw material. The generating of Cotton fiber fly throughout the knitting process is due to interactions of frictional surfaces with the hairiness of ring spun yarn. During the manufacture short fibers are formed in the machine device, this problem is more important with the use of cotton yarns. In this research paper, the short fibers formation on circular knitting machines from spun yarns such as cotton is investigated The knitting conditions consist of; yarn tension, yarn feeding speed and the angle contact of the yarn with guides and needles. The results obtained illustrate the effect of yarn tension on the short fibers deposit caused by the combination of yarn friction with the knitting elements.