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A sand scandal is brewing in China, with concerns that low-quality concrete has been used in the construction of many of the country's largest buildings -- putting them at risk of collapse.. The

The new concrete mix was made using crushed recycled concrete aggregate for both the coarse aggregate and sand, recycled concrete washout water, fly ash, slag, admixtures, and only 2 percent cement. That's equivalent to 82 pounds of cement in a 3875 pound cubic yard mix. This concrete mix containing air-entrainment had a water cement ratio of 0

They created concrete floors, housing structures, and underground cisterns. 3000 BC - Egypt and China: Egyptians used mud mixed with straw to bind dried bricks. They also used gypsum mortars and mortars of lime in the pyramids. The Great Pyramids at Giza used about 500,000 tons of mortar.

Brand New Concrete Mixer German Design Shipping by seller SKU: 25287 Made In: China Condition: Used Motor: 12 Drum Opening: 385 Drum Capacity: 115 Drum Speed: 26.7 min / tr/min Lenmark Industries Ltd 27576 51a Ave Langley, British Columbia Canada V4W4A9 Tel: 604.449.1880 www.lenmark.com

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