ភាពខុសគ្នារវាងកំណែនានារបស់ "ផ្លាយ អាស់"

 
===អិដ្ឋ===
Fly ash bricks gain strength as they age.
In India fly ash is being used to make fly ash bricks. Leading manufacturers like '''Puzzolana Green Bricks''' ( www.flyashbricksdelhi.com)have introduced high strength bricks in Delhi- NCR region which can be used like normal bricks.
 
 
In the United Kingdom fly ash has been used for over fifty years to make concrete building blocks. They are widely used for the inner skin of cavity walls. They are naturally more thermally insulating than blocks made with other aggregates.
 
Ash bricks have been used in house construction in [[Windhoek|Windhoek, Namibia]] since the 1970s. There is, however, a problem with the bricks in that they tend to fail or produce unsightly pop-outs. This happens when the bricks come into contact with moisture and a chemical reaction occurs causing the bricks to expand.
 
In May 2007, [[Henry Liu (civil engineer)|Henry Liu]], a retired 70-year-old American [[civil engineer]], announced that he had invented a new, environmentally sound building [[brick]] composed of fly ash and water. Compressed at 4,000 [[Pounds per square inch|psi]] and cured for 24 hours in a 150 °F (66 °C) steam bath , then toughened with an [[air entrainment]] agent, the bricks last for more than 100 freeze-thaw cycles. Owing to the high concentration of [[calcium oxide]] in class C fly ash, the brick can be described as "self-cementing". The manufacturing method is said to save energy, reduce [[mercury (element)|mercury]] pollution, and costs 20% less than traditional clay brick manufacturing. Liu intended to license his technology to manufacturers in 2008.<ref>Popular Science Magazine, [http://www.popsci.com/popsci/technology/b987485a9f492110vgnvcm1000004eecbccdrcrd.html?s_prop16=%20RSS:technology INVENTION AWARDS : A Green Brick], May 2007</ref><ref>
National Science Foundation, Press Release 07-058, [http://www.nsf.gov/news/news_summ.jsp?cntn_id=109594&org=ENG "Follow the 'Green' Brick Road?"], May 22, 2007</ref>
Bricks of fly ash can be made of two types. One type of brick is made by mixing fly ash with about equal amounts of soil and proceeding through the ordinary process of making a brick. This type of formation reduces the use of sand in making bricks.
 
Another type of brick can be made by mixing soil, plaster of paris and fly ash in a definite proportion with water and allowing the mixture to dry. Because it does not need to be heated in a furnace this technique reduces air pollution.
 
== បញ្ហា​បរិស្ថាន ==
===ផលប៉ះ​ពាល់​ដល់​ទឹក​ក្រោម​ដី​===
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