随着砂石骨料需求愈发旺盛。
性能得到改善的骨料。
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.
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.
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%.
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%.
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