Research On The Effect Of Integrating Energy Saving And Structure Performance In Concrete With Phase Change Steelball

In order to achieve the effect of integrating energy saving and structure performance of concrete in building structure, this paper from the perspective of concrete materials, a large thermal conductivity and PCM absorption as carrier materials was studied. And then composited phase change subsrate materials into concrete, a new kind of phase change energy storage concrete could be prepared.This article first choose hollow steelball as matrix materials adsorpting octadecane, after package, steelball phase change energy storage concrete could be gained in different coarse aggregate ratio. From the research, the results showed that:1) The quantity of octadecane absorption of steelball, was about 75% steelball mass. After 30 times thermal cycling, there was no steelball leakage. After 720 times thermal cycling, the probability of leakage of steelball steadied at 21%. The leakage rate of steelball was low.2) The compressive strength of steelball phase change energy storage concrete was less than that of ordinary concrete in the same W/C. In order to improve the bond property between steelball and cement. In this paper, coating spring clamp on steelball surface and insteading of a certain proportion of cement by silicon powder, as a results, the compressive strength of steelball phase change energy storage concrete at which stone raplacement rate were 75%, 50% and 25%, could be more than 40 MPa. At the same time, the elastic modulus for the steelball phase change energy storage concrete at stone rate were 75% and 50%, increased with dosage of silicon powder going up.3) The building model builded foam as four walls and floor and concrete plates as rooftop, had good temperature, for the building model with stone ratios at 100%, the best temperature difference influenced by phase change materials at room center was 7.1℃, compared with the room center temperature at the ordinary model. While, stone rate were 75% and 50% respectively, the best the temperature difference caused by phase change materials were 5.8 ℃ and 5.8 ℃ respectivly. Lastly, building model for phase change steelball stone ratio at a rate of 25%, the best temperature difference influenced by phase change materials at room center was 4.1℃.4) Fire resistance of the steelball phase change energy storage concrete could be improved by mixing silica fume into the concrete. Otherwise, fire behavior of steelball phase change energy storage concrete for stone ratio at 50%, was better than that for stone ratio at 75%. What’s more, fire behavior of steelball phase change energy storage concrete for stone ratio at 50% was best by mixing silica fume with 10%.5) The paper use the fast test method of chloride penetration(RCM method), the results showed that the durability of steelball phase change energy storage concrete for stone ratio at 50%, was better than that for stone ratio at 75%. What’s more, the minimum value 2.0×10-12 m2 / s appeared in steelball phase change energy storage concrete for stone ratio at 50% and mixed silica fume by 10%.6) In the thermal cycling experienments, the results showed that the compressive strength of steelball phase change energy storage concrete increased for both stone ratio at 50% and 75%, growth were 13.8% and 22.0%,respectively.