OnlyasmallquantityismanufacturedintheU.S.Mixofpozzolanswithlime.Masonrycements:Portlandcementwhereothermaterialshavebeenaddedprimarilytoimpartplasticity.Aluminouscements:Limestonesandbauxitearethemainrawmaterials.Usedforrefractoryapplications(suchascementingfurnacebricks)andcertainapplicationswhererapidhardeningisrequired....
1. Snow is cementing. 雪正在凝结。 名词 1. The cement has already set. 那水泥已经凝固了。 cement 网络解释 1. cement的意思 1. 牙骨质:应果断及时做根管治疗(Root Canal Therapy)以免后患.有很多人在牙齿的颈部(近牙齦处)表面出现楔状缺损,只有少部分人是刷牙方法不正确, 采用大力横刷, 而牙颈部这个...
PROBLEM TO BE SOLVED: To provide a cement composite material which is obtained by molding a cement-containing W/O emulsion composition comprising cement, water, an oily substance and an emulsifier, is excellent in freeze damage resistance and bending strength and is especially suitably used as a ...
1. A material or a mixture of materials (without aggregate) which, when in a plastic state, possesses adhesive and cohesive properties and hardens in place. Frequently, the term is used incorrectly for concrete, e.g., a “cement” block for concrete block. See also portland cement. 2. A...
there is additional contribution to the entropy of the liquid due to increased randomness.As the entropy of solution is higher than that of pure liquid, there is weaker tendency to form the gas.Thus, a solute (non-volatile) lowers the vapour pressure of a liquid, and hence a higher boiling...
or burned separately when it is to be inter-ground with portland cement clinker or blended with portland cement, calcium sulfate, and free lime.Type M: A mixture of portland cement, calcium aluminate cement, and calcium sulfate.Type S: A portland cement containing a large computed tricalcium al...
The heat of hydration of cement is the amount of energy required to hydrate a mass unit of cement (1 kg) in water at 37°C. This quantity is defined as the product of the enthalpy change and time, or ΔH value. The enthalpy change depends on temperature, pressure and type of cement...
One example of such a set retarder is a copolymer formed from a monomer of 2-acrylamido-2-methylpropane sulfonic acid (AMPS); and a commercial AMPS set retarder is SCR-100™ (Halliburton Energy Services, Inc.). When cement composition additives that are not biodegradable are utilized in ...
A polymer is a chemical compound that has a simple structure of large molecules. Perhaps the earliest known occurrence of cement is from twelve million years ago. A deposit of cement was formed after an occurrence of oil shale [页岩] located adjacent to a bed of limestone burned due to natu...
A building material that is a powder made of a mixture of calcined limestone and clay; used with water and sand or gravel to make concrete and mortar Concrete A compound or mass formed by concretion, spontaneous union, or coalescence of separate particles of matter in one body. To divide al...