Self-consolidating concrete flow mainly depends on the properties of the Self-consolidating mortar (SCM) design. SCM properties are influenced by mineral powder content, powder (mineral additive) type, and the chemical admixture content used in the mixes. In this study, the effects of mineral additives, the water/powder ratio, and the chemical admixture content on the yield stress of SCM was investigated. Five mineral additives, including limestone powder, waste marble powder, brick powder, fly ash, and limestone powder plus fly ash, were used. The SCM mixes with different powder types were prepared by using the polycarboxylate-based chemical admixture in ratios of 1, 1.5, 2, and 2.5% by powder weight. Total powder content (cement and mineral additives) was constant. The workability of fresh SCM was defined using the mini slump cone test and mini V-funnel tests. The yield stress of SCM was determined by the asymptotic flow regime approach, which depends on slump flow value. The test results show that the powder type is as effective as the chemical admixture and water/powder ratio (w/p) on the yield stress of SCM. SCM yield stress decreased as the w/p and SP dosage increased.