高度超过800米、多达160层的迪拜塔(Burj Dubai)拔地而起，直冲云霄。这座全世界最高的建筑物于2010年1月4日建成揭幕。巴斯夫的混凝土外加剂Glenium SKY帮助迪拜塔创造了全球建筑物高度的新纪录。迪拜塔轻松超越了位于台湾的台北101大楼 -- 台北国际金融中心，使这座高509米、共101层的大厦从此退居世界第二位。
迪拜塔的施工为期五年，其令人炫目的高度以及极端的气候条件，给混凝土外加剂带来了特殊的挑战：凭借巴斯夫的Glenium SKY品牌高性能混凝土外加剂，混凝土可以不间断地泵送至600米的高度。迪拜塔的地基和上层结构大约需要18万立方米添加了Glenium 增塑剂的混凝土。巴斯夫化学建材业务部负责人敖云峰(Tilman Krauch)博士表示，“迪拜塔的建造是工程史上的杰作，我们很自豪能够为这项工程的建成做出贡献。”
巴斯夫提供的这种基于聚羧酸聚合物的混凝土外加剂具有卓越的流动性，可以防止混凝土在泵送过程中因高压而分层离析。在施工现场，通过使用Glenium SKY可以轻松地处理混凝土，避免品质受损。此外，Glenium SKY高性能外加剂可以提高混凝土的早硬强度。每一楼层浇筑的混凝土可以迅速达到足够的稳定性，使施工在短时间内得以继续。通过这种方式，Glenium SKY能够确保建筑工作的快速进展。在迪拜，通常的施工进度为每周一层，而迪拜塔的施工超越了这种进度，达到每周两层。
建造这座世界第一高楼时还需面临的更多挑战是迪拜的气候条件：这里的气温冬季低至10°C，夏季则高达50°C，且昼夜温差常常达到20°C。尽管如此，Glenium SKY的优异性能以及现场巴斯夫团队的专业技术确保了混凝土一贯的高品质。
另外，迪拜塔的超常高度给混凝土结构带来了极大的压强。为了防止这座摩天大楼坍塌，Glenium SKY使混凝土的耐压强度高达80N/mm2。这相当于一辆小汽车的重量施加在一个大脚趾上的压强。高耐压强度可以使混凝土结构拥有长久的使用寿命，从而确保迪拜塔的可持续使用。
巴斯夫化学建材服务中国市场长达20年，作为业内倍受信赖的合作伙伴，巴斯夫为众多著名项目作出了贡献，其中包括广州西塔、台北101、杭州湾大桥、三峡大坝和中国高速铁路等。
附英文版：
Rising more than 800 meters to 160 stories, the Burj Dubai appears to touch the Dubai skies. On January 4, 2010, the tallest building in the world is opened. Glenium SKY concrete additives from BASF helped to achieve this new world record in altitude. The Burj Dubai comfortably exceeds the Taipeh International Financial Centre in Taiwan, which boasts a height of 509 meters and 101 stories, relegating it to second in global ranking.
With a construction period of five years, dizzying heights and extreme climate conditions, the Burj Dubai presented a very special challenge to the concrete plasticizer: With the high-performance concrete plasticizer from BASF sold under the brand name Glenium SKY it was possible to pump the concrete up to an altitude of 600 meters without interruption. The foundations and the superstructure of the Burj Dubai required approximately 180,000 m3 concrete with Glenium plasticizer. “The construction of Burj Dubai is an engineering master piece. We are proud that we could contribute to the success of this project,” said Dr. Tilman Krauch, Head of Construction Chemicals division of BASF.
The concrete additives, which are based on polycarboxylate ether polymers, ensure great flowability and, during the pumping process, they are able to prevent segregation in spite of the high pressure used. On site, it was easy to process the concrete without quality loss due to Glenium SKY. In addition, Glenium SKY super-plasticizers improve the concrete’s early strength. The concrete cast to build a new story quickly reaches sufficient stability so that construction work can be continued after a short while. This way, Glenium SKY helped to ensure that building work progressed quickly. With two stories built per week, the building speed exceeded
the usual Dubai standard of one story a week.
Further challenges that had to be met when constructing the tallest building in the world were the climate conditions in Dubai: Here, the temperatures not only fluctuate between 10°C in winter and 50°C in summer but the temperature difference between day and night can easily reach 20°C. Glenium SKY and the expertise of the BASF team on site, however, made sure that the concrete was of a consistently high quality.
In addition, the enormous height of the Burj Dubai causes extreme pressure in the concrete structure. To prevent the skyscraper from collapsing, Glenium SKY lends the concrete a compressive strength of up to 80 N/mm2. This equals the entire weight of a small car resting on a space as small as the big toe. The great strength gives the concrete structure a long lifespan and ensures the sustainable use of the tower.
With a strong presence in China for 20 years, BASF’s Construction Chemicals has been recognized as a reliable partner in the industry and has contributed to many prestigious projects including Guangzhou West Tower, Taipei 101, Hangzhou Bay Bridge, Three Gorges Dam and China High-speed Railway.
