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为了揭示钢渣粗骨料因安定性不良问题而对混凝土造成破坏的规律,将钢渣粗骨料和含钢渣粗骨料的混凝土进行了压蒸试验,研究了钢渣粗骨料含量对不同强度的混凝土的破坏规律。所用钢渣的游离CaO和MgO质量百分数分别为4.83%和4.76%。研究结果显示:压蒸条件下,游离CaO和MgO矿物会加速反应使钢渣粗骨料发生膨胀破坏,含钢渣粗骨料的混凝土可能会因钢渣产生的内部膨胀应力而产生损伤;钢渣粗骨料占粗骨料的比例越大,对混凝土造成的损伤越严重;混凝土的强度越高,抵抗钢渣粗骨料造成内部膨胀应力的能力越强,但钢渣粗骨料的含量仍需严格控制,就该文采用的钢渣而言,钢渣粗骨料质量百分数不能超过40%。
In order to reveal the regularity of the damage of concrete due to poor stability, the coarse aggregate of steel slag and the concrete containing coarse aggregate of steel slag were subjected to steam-pressure-steaming test. The effects of coarse aggregate content of steel slag on concrete with different strength The law of destruction. The free CaO and MgO mass percentages of the used steel slag are 4.83% and 4.76% respectively. The results show that the free CaO and MgO minerals will accelerate the reaction to cause the steel slag coarse aggregate to expand and destroy under the condition of steaming. The concrete with steel slag coarse aggregate may be damaged by the internal expansion stress caused by steel slag. The greater the proportion of coarse aggregate, the more serious damage to concrete. The higher the strength of concrete, the stronger the ability of resisting internal expansion stress caused by coarse aggregate. However, the content of coarse aggregate still needs to be strictly controlled. In this paper, the slag content, the mass fraction of coarse aggregate can not exceed 40%.