美国水泥需求量三季度已经下降了19%，预拌混凝土下降了30%，骨料下降了31%。
US cement volumes had fallen 19% in the third quarter. Readymix has fallen 30% and aggregates 31%.
国内许多大型工程都非常重视混凝土碱骨料反应问题，均采取了有效的预防控制措施。
More attention is paid for AAR in many large-scale domestic constructions, and measures are taken.
在砂石骨料混凝土系统方案优选中受到多种条件的制约，所涉及的因素多而繁琐。
The factors in this field with which we are concerned are many and various.
在砂石骨料混凝土系统方案优选中受到多种条件的制约，所涉及的因素多而繁琐。
The factors in this field with which we are concerned are many and various.
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