Cement absorbs carbon dioxide well. Free Technical Library News

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Cement absorbs carbon dioxide well

28.11.2016

An international team of researchers led by Professor Dabo Guan from the University of East Anglia found that cement-based materials have the ability to absorb excess CO2 from the air.

Carbon dioxide is absorbed through a process called carbonization. This is a slow process that accompanies the entire life cycle of a cement-based material. CO2 penetrates through the pores of the material and starts a chemical reaction - first in the surface layers, gradually moving inside.

The authors of the study modeled regional and global atmospheric CO2 uptake from 1930 to 2013 using new data from field studies in China and available data from studies of cement materials in service, demolition and recycling of concrete waste.

Modeling has shown that the existing cement reserves around the world absorb about one billion tons of atmospheric CO2 annually. The researchers focused on four materials: concrete, mortar, construction waste cement, and cement dust.

Scientists have calculated that this is approximately 43% of the CO2 emissions from cement production over the same time period, not including emissions associated with the combustion of fossil fuels in the production process. In turn, carbon dioxide emissions from cement production account for up to 90% of all industrial emissions, the authors of the study note.

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ADATA HD700 and HV620S Hard Drives 27.06.2016

ADATA has announced the HD700 and HV620S external hard drives that use a USB 3.0 interface to connect to a computer.

The HD700 is IP56 rated, which means it is water and dust resistant. The operating temperature range is from 5 to 50 degrees Celsius. Capacity - 1 or 2 TB. Dimensions are 133,0 x 88,0 x 22,0 mm.

The second novelty, HV620S, is capable of storing 1 TB of information. This model is characterized by compact dimensions of 115 x 78 x 11,5 mm.

Both hard drives use a USB cable for power, so no additional power source is required.

The HD700 external hard drive will be available in black and blue, while the HV620S is available in dark blue. Unfortunately, nothing has been reported about the timing of the start of deliveries to the Russian market and the estimated cost.

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