Proceedings of the International Conference on Industrial Engineering and Operations Management Dubai, UAE, March 10-12, 2020 © IEOM Society International Application of Tagushi Design in Quality Improvement for Construction Industry Ziout, A., Jaber Abu Qudeiri , Mohammed AlAjouz, Osama Bassam, Hana Abusabiekeh Department of Mechanical Engineering United Arab Emirates University AlAin, AbuDhabi, UAE Ziout@uaeu.ac.ae Abstract This study aims to utilize Tagushi design in quality improvement for construction industry. A comparison between full factorial and Tagushi design is conducted experimentally. The experiment investigates the effect of four major factors and their interactions on concrete compression strength. The factors are; percentage of recycled aggregates, percentage of dune sand, amount of steel fiber in concrete mixture and test time. Two types of design of experiments (DOE) have been done to test different concrete mixtures by using different combinations of the mentioned four factors. The collected data has been studied using full factorial and Taguchi “Robust” designs. Also, Minitab software results have been obtained and analyzed. Based on full factorial design, it was found that all factors were significant, whereas the interactions between factors were significant only for two-way interaction. The three-way and four-way interactions were insignificant. On the other hand, Taguchi analysis was used to determine the main effects of factors. The results of both full factorial and Taguchi methods were the same except for the percentage of dune sand. In the full factorial method, when combining both types of sand, the compressive strength of concrete increased. In contrast, Taguchi showed opposites results. Keywords Design of Experiments, Full factorial, Taguchi design, construction industry Introduction and Literature review Concrete is the main building material that is widely used in all kinds of civil engineering works like substructure, infrastructure, buildings, installations of defense work, environs defense and local-domestic improvements. Basically, concrete is made by three basic components which are water, natural aggregates, such as sand, rocks or gravel, and Portland cement. Recently, the perception of the continued extensive abstraction and use of natural resources aggregates is questioned at a worldwide level (Lawson et al, 2001). In order to overcome this problem and decrease the rapid consumption of natural aggregates, concrete debris, resulted from demolition works, are being recycled and used in concrete productions. Recycled concrete aggregate lessens impact on landfills, reduces energy depletion and provides cost reserves (Huang et al, 2002). Yehia et al. (2015) studied the concrete properties produced with 100% replacement of recycled aggregates (RA). The test results showed that compressive, strength of the 100% RA concrete could be achieved with high packing density of concrete” high compaction”.Zhou and Chen (2017) studied the effect of two different types of recycled aggregate in the mechanical properties of concrete. The results showed different mechanical properties for various types of recycled aggregates. RPA had lower water absorption and density than RCRA. Therefore, RPA concrete had high compressive strength than RCRA. The compressive strength of recycled aggregate concrete was similar and sometimes higher than that of normal aggregate concrete. The authors referred this result due to high absorption of recycled which lead to higher bonding strength between cement and aggregate. M. Baena et al. (2016) studied the effect of recycled aggregate on concrete mix. Test results showed C20 compressive strength decreased regardless of the percentage replacement of recycled aggregate due to different in water-cement ratio. C30 for 50% and less 1443