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Round up domestic steel prices HC Valve Network: Domestic steel prices continue to rise overall, including tons of cold rolled coils prices rose 150 yuan. CCTV reporter Yang Chao connection below to find details.

Moderator: Steel prices continue to rise, or how much, where relatively large gains?
Reporter: Spot prices of steel in the building last week, rose again in general, including Jinan, Taiyuan, Lanzhou and other markets rose by a larger average increase per ton 100 yuan, Plate prices rise sharply, or the biggest is in Beijing and Tianjin market, up 150 yuan per ton, hot-rolled product prices overall rose 50 yuan per ton, cold-rolled products, the average rose to 150 yuan per ton.

Moderator: Steel prices continue to rise, what is the reason?
Reporter: rising costs push power on the one hand, on the other hand is the demand pull, is mainly two aspects. In addition, one is making the economy take a good demand in the security, on the other hand is a strong ability to shift the cost of some
  Steel Rise in raw materials companies, while the transfer by way of price increases the cost. It is noteworthy that iron ore imports continue to maintain nearly a month is an upward price trend, the current domestic market price of imported ore from 116 to 118 U.S. dollars per ton in the price has reached its highest point during the year than the year lows nearly doubled.

A concrete technology

Hollow core concrete systems coupled with energy efficient TermoDeck technology offer several advantages when compared with traditional systems.

EFFICIENT: Hollow core concrete slabs being used on a building.

In the world of concrete, hollow core systems that have been around for about 25 years in different countries, is now knocking the doors here.

The technology of factory-made concrete slabs for floors and roofs has been in use for a long time. In Kochi, the proposed shopping mall, by the promoters of Dubai's Lulu Centre, at Edappally is likely to have hollow core slabs. For this the company that would be taking up the contract would be setting up a plant here.

Energy efficient

John Durham, Technical Director of Hollow Core Systems (India) Private Limited and TermoDeck International Limited, who made a presentation at the recent national convention of the Builder's Association of India in Kochi, made quite an impression on builders assembled here with his presentation on an energy-efficient system promoted by the company.

According to him, the system promoted by his company has not just hollow core slabs but an energy efficient system too, which goes hand in hand with the hollow core slabs.

The concrete slabs in the required specifications are set in the factory and brought to the site of construction. Fixing of the slab requires just about four workers, said Mr. Durham. A 500 sq.feet. floor can be fixed in a matter of hours, he added. A bigger area may take a day, he added. The traditional process of laying a roof takes days for the arrangements and at least 10 days for the wet concrete to set in. But with hollow core slabs it can be finished in just about a day.

The system is environment-friendly as it totally removes the need of the bamboo props that are required to give support to concrete laying by the traditional method, said Mr. Durham. The high-technology method of making the hollow core slabs reduces the weight of the concrete by 60 per cent. Water content in the concrete is reduced by 70 per cent and the span of the concrete is big.

The casting bed is 1.20-1.40 metres wide, and standard thickness, between 15 cm and 50 cm. No plastering is required on the slabs because of the fine finish, said Mr. Durham. It can straight away take a coat of paint.

The slabs have tubular holes - cores - running through its length. The slabs take its name from this hollowness inside and the main purpose of the hollow core is to decrease the weight. The materials used are comparatively much less, though there is no compromise on strength. The slabs are made on steel strands running longitudinally

The concrete beams between the holes carry the steel rods that provide the compressive stress that holds the slab together under heavy loads.

Workers at Concrete Technology in Tacoma set rebar for the second bridge girder on November 16, 2007. 


Overhead cranes are used to maneuver the steel framing into position before the concrete is poured. 


Positioning the steel framing for the second girder. 


I-90 Easton bridge girder tagged for shipment.



The first girder curing on the Tacoma waterfront. This photo illustrates the "bulb tee" (pdf 634kb) girder design.