求翻译：混凝土耐久性破坏经常是多因素引起的，有的是碱---骨料反应引起或加剧其它因素的破坏作用，有的是其它因素的破坏加剧碱---骨料反应。应该全面强调混凝土耐久性各方面因素，以保证和提高混凝土结构的安全使用期。施工期间要求做到以下几点：依据《普通混凝土用碎石或卵石质量标准及检验方法》检验粗骨料的碱活性。采用低碱水泥。（以含NaO%+0.658K2O%）为标准。采用低碱外加剂（含膨胀剂）。是什么意思？

Durability of concrete destruction is often caused by multiple factors, some alkali --- aggregate reaction to cause or exacerbate the damaging effects of other factors, some destruction of the other factors exacerbate the aggregate reaction of alkali ---. Should be comprehensive and emphasize the du

Concrete durability damage is often caused by many factors, some are alkali - galvanizer reaction or other factors increase the destructive role, some other factors increase the damage - galvanizer alkali reaction. It should be stressed that all concrete durability factors in all aspects, to ensure

Durability of concrete damage is often caused by many factors, some soda---aggregate reaction of damage caused or exacerbated by other factors, some other factor undermining alkali---aggregate reactions. Should emphasize various aspects of durability of concrete factors to ensure and improve the saf