外文翻译--再生改性混凝土的性能

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1、中文 3074 字 毕业设计 (论文 )外文资料翻译 系 别： 建筑工程系 专 业： 土木工程 班 级： 姓 名： 学 号： 外文出处： 汉斯国际期刊土木栏 附 件： 1. 原文 ； 2. 译文 2013 年 12 月 29 日 原 文 ： The Regeneration Performance of Modified Concrete Abstract: the removal of the original building, to make use of the abandoned concrete, can Protect environment and related to the

2、 sustainable development of building. The waste concrete crushing recycled aggregate, need to establish a process. Currently relatively mature methods are: the use of swelling shrinkage compensating admixture can be made from recycled concrete C50. Keywords: ecological environment； recycled aggregat

3、e； basic properties； shrinkage compensation 1 Introduction In todays world, environmental problems have become increasingly prominent, the sustainable development has been put on the agenda. Efficient, rational use of limited resources is the most important way to achieve sustainable development. Co

4、ncrete production requires a large amount of coarse and fine aggregate and sand, with the continuous mining of sand, natural building aggregate tends to dry up, the high cost of mining, the damage to the ecological environment is also very serious. On the other hand, the rapid development of city co

5、nstruction and all kinds of natural disasters have abandoned concrete waste a lot of. Recycling with the strategy of sustainable development requirements of the waste concrete, can bring significant social, economic and environmental benefits, the rise of the recycled concrete has become an importan

6、t research topic in many developed countries. 2 International renewable development status of concrete The waste concrete block by crushing, grading and mixing according to certain proportion to form aggregates known as recycled aggregate and recycled concrete aggregate. As a part or the whole of th

7、e recycled aggregate concrete as recycled aggregate concrete, recycled concrete, the traditional building materials production and use caused by excessive consumption of resources, energy shortages and environmental pollution and other serious problems, cement and concrete is an important cause of t

8、hese problems. Cement concrete structure is usually only a few decades of life cycle, completed in the structure of its use, the old concrete will be abandoned. According to statistics, industrial solid wastes produced 40% is the construction industry, construction industry to produce waste concrete

9、 is the biggest waste. In twentieth Century 90 in the early 1990s, the national annual output of waste concrete is 50000000 tons, USA is 60000000 tons, about 12000000 tons of Japan. Facing the increasing shortage of sand and other natural resources, the grim situation of construction waste is increa

10、sing, governments and research institutions have established policies, the development of new technology, in order to promote the construction waste especially recycling old concrete utilization. According to statistics, since the 90s, the annual consumption of the world total has more than 80 tones

11、 of concrete. In concrete aggregate accounted for over 70% of the total mass. 3 Compensating shrinkage of modified concrete Normal concrete is to use a wide range of building materials, but because of its limit extension rate is low, easy to crack in the dry shrinkage, creep, temperature effect, res

12、ulting in leakage caused by corrosion of reinforcement and concrete engineering, use function and the life of structures. The research indicated that, the swelling agent or expansion of shrinkage compensating concrete cement, concrete cracking is to solve the effective technical way infiltration pro

13、blem because of shrinkage compensating concrete hardening process in water can produce 0.20.7 Map pre compressive stress (or stress), the stress can be offset or partially offset by concrete shrinkage, creep, temperature induced tensile stress, so as to improve crack resistance of concrete engineeri

14、ng； in addition, due to the hydration expansion hole filling effect of products, the large hole in cement paste is smaller, the total porosity, which can improve the pore structure of concrete, greatly improve the impermeability of concrete, therefore make shrinkage compensating concrete expansive c

15、ement in foreign countries is also known as the waterproof cement. The shrinkage compensating concrete is an important branch of modern concrete science, its unique properties, is to solve the volume stability, high performance concrete is an important technical basis to improve the durability of co

16、ncrete, the research on it has yet to be further and perfect, this paper expounds some basic properties of shrinkage compensating concrete. 3.1 Expansion agent Physical and chemical properties: refers to the concrete expansion agent in concrete mixing process and the cement, water mixing after hydration reaction of stringier 3CaO Al2O3 3CaSO4 32H2O or calcium hydroxide Ca (OH) 2, make concrete produce volume expansion admixture. Concrete expansion agent is used to prepare the expansive concrete (including shrinkage compensating concrete