简析了石钢电炉炼钢厂矩型坯内裂产生的原因，并提出了相应改造措施。
The reason for inner crack in rectangular billet is analyzed and some measures to improve presented.
通过全面检测和分析，指出混凝土骨料中含有的方镁石发生水化反应所引起的体积膨胀，是混凝土构件胀裂的根本原因。
Through some macro and micro inspections, the cause is found out of the volume expansion due to the hydration of magnesia in concrete aggregates.
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