ZY补偿收缩混凝土在苏州科技新天地工程的应用

苏州科技新天地工程地下室长约260m,宽约120m,除主楼四周设沉降性的后浇带以外,地下室其余地方均不设后浇带,需一次性浇筑完毕。这样地下室连续浇筑的混凝土最长仍有200多m,本工程底板厚度900-2760mm,属大体积混凝土,而且底板不做外防水,因此裂缝的控制尤为重要。苏州科技园科技新天地工程运用ZY补偿收缩混凝土抗裂防渗技术,采用不同限制膨胀率的补偿收缩混凝土,使超长混凝土结构不同部位的混凝土收缩得到了大小适宜的补偿,实现了超长混凝土结构的一次性连续浇筑,科学合理地解决了超长混凝土结构无缝施工和设计的难题,地下室底板取消外防水,取得了不裂不渗的良好效果。

Application of ZY Shrinkage Compensating Concrete to Suzhou New World of Technology Project

The basement of Suzhou New World of Technology Project has length of 260m and width of 120m. Post-grouting belts were designed merely around the main building, and other places of the basement had no post-grouting belts which required finished by once grouting. Thus the longest direction of the basement concrete requiring once grouting was over 200m. The thickness of the base plate is 900-2760mm, so it was mass concrete, besides, the base plate had no outside waterproof, therefore, the control of crack was essentially important. This project applied ZY shrinkage compensating concrete crack-resistance and seepage-proofing technique by adopting shrinkage compensating concrete of different restrained expansive rates which supplied moderate compensation for the shrinkage of different parts of the over-length structure, thus once-over grouting of over-length concrete structure was completed, the problem of seamless construction was resolved reasonably. Though the outside waterproof was cancelled, sound effect of crackless and seepageless was achieved.