Answer: Gypsum is added to control the "Setting of cement". If not added, the cement will set immediately after mixing of water leaving no time for placing.

Rapid Set cement in not a gypsum cement. Unlike gypsum, Rapid Set® cement can be used in wet environments. See similar questions...

Answer: Setting is the stiffening of the cement paste after water is mixed. Broadly it refers to change of fluid to solid state. See similar questions...

Answer: The rate of hydration of cement depends on the fineness of cement and for a rapid development of strength high fineness is necessary. See similar questions...

Answer: Cement (sometime referred to as Portland Cement or hydraulic cement) is one component of concrete. Cement is to concrete what flour is to a loaf of bread. Concrete is basically a mixture of 2 components: aggregates and paste. The paste, comprised of cement and water, binds the aggregates (sand and stone or grael) into a rocklike mass as the paste hardens because of the chemical reaction of the cement and water. This reaction is called hydration. See similar questions...

Answer: Cement may sometimes contain free lime, which may cause expansion; hence soundness test is conducted to see that even if uncombined lime is present in cement whether it is in prescribed limits. If it is within the prescribed limits then it is said to be sound and causes less expansion and cracks. See similar questions...

Answer: Proper storage of cement shall permit easy access for inspection and identification. Cement shoudl be stored in suitable weather, tight sructures, to protect the cement from dampness. It should not be piled more than ten bags in a stack and should be arranged in heather and stretcher fasion as far as possible. While removing the bags for use "FIRST IN FIRST OUT" rule should be applied. See similar questions...

A white mineral that is milled, heated, hydrated and formed into drywall; or used to manufacture plaster. See similar questions...

Cement, or Portland cement, is a dry powder made from limestone and other materials. It is burned in a kiln and then ground finely. Cement reacts chemically with water to cause concrete to harden. There are several different types of Portland cement, designated as Type I, Type II, Type III, etc. See similar questions...

Primitive Baptists cannot consent with those who compromise scriptural commandments in order to gain social acceptance. We deny the claim that terms of truth and morality are to be guided by the ever changing winds of social values (Eph 4:14). Instead, these are defined by our ever constant Lord, and are revealed in His inspired word (Mal 3:6, Lk 21:33, Heb 13:8, I Pet 1:24-25). See similar questions...

NCPDP would like to ask the NCVHS to work with all of the SDOs and help monitor the process as we move forward with this project. As you know, standards development does take time in order to reach consensus, not only with our member companies, but also with other SDOs. We would like to ask for the necessary time for consensus on this standard versus putting one out there that will have problems and high costs. We would appreciate any guidance regarding federal preemption. See similar questions...

Did you know that 32 million (14 percent) of the people in the U.S. speak a language other than English at home? For example in California, 0.6 million people speak Chinese and 5.5 million speak Spanish at home. Over 17 million (8 percent) of the people living in the U.S. speak Spanish at home. Understand cultural diversity. Many cultural groups depend upon fishing to augment their diet either because of poverty or tradition. See similar questions...

Answer: Calcareous (Lime stone obtained from mines) are Argillaceous materials (Clay, Bauxite) and Iron are teh commonly used Raw materials in the manufacture of cement. See similar questions...

Answer: Slow setting in cement is due to salts and chemicals in water sand and aggregate. Cold weather, less cement, high percentage of impurities, adulterated cement and improper water cement ratio. Qick setting of cement is due to addition of low quantity of Gypsum, hot weather condition, high cement fineness. See similar questions...

Answer: The Setting time of Cement is the time required by concrete to harden and set itself according to the formwork in which it has been placed. The amount of time taken by concrete to set is 7 hours to 10 hours depending on the conditions under which the concrete is placed in the formwork. But this does not mean that the formwork may be removed after 7 hours. See similar questions...

Answer: No, the color of cement does not affect the strength of cement in anyway. It just gives a proper finish to the concrete. There is a general misconception that the cement that is darker in color has greater strength, this is not true and the cement that is lighter in color not only has the same strength but also has a more pleasing finish than the cement that is darker in color. See similar questions...

Answer: The water cement ratio is very important with regards to the strength of concrete. The strength of concrete is inversely proportional to the water cement ratio i.e. with teh increase in water content the compressive strength of concrete decreases and vice versa. See similar questions...

Materials that contain appropriate amounts of calcium compounds, silica, alumina and iron oxide are crushed and screened and placed in a rotating cement kiln. Ingredients used in this process are typically materials such as limestone, marl, shale, iron ore, clay, and fly ash. The kiln resembles a large horizontal pipe with a diameter of 10 to 15 feet (3 to 4.1 meters) and a length of 300 feet (90 meters) or more. One end is raised slightly. See similar questions...