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The phase composition of a particular cement can be quantified through a complex set of calculation known as the Bogue formula. To avoid the flash setting of concrete, due to the very fast hydration of the tricalcium aluminate ( C 3 A ), 2–5 wt. % calcium sulfate is interground with the cement clinker to prepare the cement powder.
An AFm phase is an "alumina, ferric oxide, monosubstituted" phase, or aluminate ferrite monosubstituted, or Al 2 O 3, Fe 2 O 3 mono, in cement chemist notation (CCN). AFm phases are important hydration products in the hydration of Portland cements and hydraulic cements.
Texas City Independent School District is a public school district based in Texas City, Texas. It serves most of Texas City and La Marque as well as a portion of Tiki Island. [2] In 2009, the school district was rated "academically acceptable" by the Texas Education Agency. [3]
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]
The effect of the water-to-cement (w/c) ratio onto the mechanical strength of concrete was first studied by René Féret (1892) in France, and then by Duff A. Abrams (1918) (inventor of the concrete slump test) in the USA, and by Jean Bolomey (1929) in Switzerland.
In 2009, the school district was rated "academically acceptable" by the Texas Education Agency.[2]The Texas Education Agency's college readiness performance data shows that only 3.1% (5 out of 152 students) of the graduates of the class of 2010 of the La Marque school district met TEA's average performance criterion on SAT or ACT college admission tests.
The Dallas Independent School District (Dallas ISD or DISD) is a school district based in Dallas, Texas . It operates schools in much of Dallas County and is the second-largest school district in Texas and the seventeenth-largest in the United States. It is also known as Dallas Public Schools (DPS). [8]
Hitchcock Independent School District is a public school district based in Hitchcock, Texas, United States. In addition to Hitchcock, the district serves parts of La Marque (including Delaney Cove ) Tiki Island [ 1 ] and the Saltgrass Crossing Subdivision.