摘要
在高温干热气候环境下,现浇混凝土的收缩程度较大,导致浇筑结构的误差难以满足验收要求,为此,提出高温干热气候现浇混凝土质量控制方法。在现浇混凝土原料质量控制阶段,通过与水泥生产厂家签订技术合同的方式,对水泥温度进行控制,同时控制注入水泥罐水泥的使用时间在12 h以后,确保水泥的热量充分释放;在砂石骨料方面,提高大颗粒骨料级配,并对其实施防晒措施,极端情况下对粗骨料仓进行喷水冷却处理。在混凝土搅拌过程中,通过在搅拌机内适当添加碎冰的方式对混凝土温度加以控制。在开展混凝土浇筑之前,以待施工结构所在位置为中心,安装冷却水管装置,采用分区分层浇筑法按照周围向内侧倾斜式的方式进行混凝土的浇筑,过程中配合二次振捣工艺。在实际应用结果中,将不同部位的浇筑混凝土施工误差控制在允许误差范围内,具有良好的实际应用效果。
In the high temperature and dry and hot climate environment,the shrinkage degree of cast-in-place concrete is large,resulting in the error of the pouring structure is difficult to meet the acceptance requirements.Therefore,the quality control method of cast-in-place concrete in high temperature and dry and hot climate is proposed.In the quality control stage of cast-in-place concrete raw materials,the cement temperature is controlled by signing the technical contract with the cement manufacturer,and the use time of the cement tank is controlled after 12 hours to ensure full heat release;the large particle aggregate grading is improved and sunscreen measures are implemented.Besides,the coarse aggregate bin is cooled by water in extreme cases.In the concrete mixing process,the concrete temperature is controlled by properly adding broken ice in the mixer.Before the concrete pouring,the cooling water pipe device should be installed in the center of the construction structure,and the concrete pouring method is carried out according to the surrounding inclined way to the inside,combined with the secondary vibration process in the process.In the practical application results,the pouring concrete construction error of different parts is controlled within the allowable error range,which has a good practical application effect.
作者
曹金亮
谭龙
姚黎明
王成志
CAO Jinliang;TAN Long;YAO Liming;WANG Chengzhi(Sinohydro Third Engineering Co.,Ltd.,Xi'an 710024,China)
出处
《四川建材》
2023年第10期160-162,共3页
Sichuan Building Materials
关键词
高温干热气候
现浇混凝土
质量控制
原料质量控制
骨料级配
冷却水管装置
分区分层浇筑法
high temperature dry and hot climate
cast-in-place concrete
quality control
raw material quality control
aggregate grading
cooling water pipe device
partition layered pouring method
