# Experimental Study on the Workability and Stability of Steel Slag Self-Compacting Concrete
## 1 Introduction
The results show that with the increase of slag content, the self-compacting performance of concrete gradually reduces, and when the replacement rate is low, the self-compacting performance of concrete still remains. [PERSON] et al. [18] used magnetite aggregate to replace the natural coarse aggregate of SCC and general concrete with the volume ratio of 50%, 75% and 100% in the study of heavyweight SCC. The slump test and J-ring test results show that the workability of fresh concrete decreases gradually with the increase of the amount of magnetite aggregate. [PERSON] et al. [19] used the slump flow test, V-funnel test, L-box test and J-ring test to study and analyze the workability of SCC with ethylene vinyl acetate (EVA) and ladle furnace slag (LFS) instead of cement and natural sand. The results show that adding EVA increases the workability of SCC, while LFS decreases that. In recent years, quite a few researchers have begun to explore the application of steel slag in the preparation of SCC [20; 21; 22; 23; 24; 25; 26]. [PERSON] et al. [20] developed SCC containing stainless steel oxidizing slag (SSOS, partial substitution of fine and coarse aggregate) and stainless steel reducing slag (SSRS, partial substitution of cement). Results showed that the stainless steel slag-based SCC can accelerate the hardening process, the compressive strength of SCC prepared with SOS replacement in full exhibits slightly better or at least similar results to that of the control while potentially volumetric instability. [PERSON] et al. [21; 23], investigated the mix design, in-fresh and hardened properties of SCC incorporating electric arc-furnace steelmaking slag as aggregate, and concluded that it is possible to prepare SCC using electric arcfunace slag as coarse and fine aggregate, using appropriate doses and compatible chemical admixtures. [PERSON] [22] investigated the effect of steel slag replacing natural aggregate on SCC, and the slump flow test, V-shaped funnel test, column segregation test, sieve analysis test, segregation probe test and U-shaped box test were used to comprehensively evaluate the influence. The results show that steel slag aggregate can be used in SCC, but the workability of SCC will be greatly affected when the substitution rate of steel slag is over 50%. [PERSON] [24], investigated the combined influence of glass powder and granular steel slag on fresh and mechanical properties of SCC, and found that the workability of SCC decreases with the increase in granular steel slag content which may be attributed to the porous and rough texture of steel slag. [PERSON] et al. [25] investigated the effects of steel slag powder on the properties of SCC with recycled aggregates and found that steel slag powder improved the filling ability and passing ability of SCC, but adversely affected segregation resistance. [PERSON] et al. [26] investigated the feasibility of high-performance SCC prepared with electric arc furnace slag (EAFS) aggregate and cupola slag powder based on the rheological and physical-mechanical experiments of SCC. The experimental results showed that it is possible to obtain a very homogeneous, symmetrical, and stable distributed mixture without segregation or concentration of coarse aggregates. EAFS reduces concrete slump and passing ability by 10%, reduced the flow rates more noticeably compared to reference mixes due to their high viscosity. Use of industrial wastes as cement or aggregate replacement can play vital role in reducing the utilization of natural resources, besides decreasing land and air pollution [24]. Although there are many works on steel slag use as aggregates or mineral admixture in concrete and its advantageous properties have been reported, the research on the utilization of steel slag in SCC preparation has only begun in recent years to some extent because the high water absorption of steel slag is unfavorable to the fluidity of the concrete mixture.