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• Portland cement — is the most common type of cement in general usage in many parts of the world, as it is a basic ingredient of concrete, mortar, stucco and most non specialty grout. It is a fine powder produced by Portland cement clinker (more than 90%), a… …   Wikipedia

• Approximate Composition of Portland Cement, Table — ▪ Table Table 2: Approximate Composition of Portland Cement (ASTM Types I–V)   ASTM type and name composition (%)* characteristics applications C3S  C2S  C3A  C4AF  I (Ordinary) 42–65 10–30  0–17  6–18 no special requirements general construction …   Universalium

• Cement — In the most general sense of the word, a cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The name cement goes back to the Romans who used the term opus caementicium to describe masonry… …   Wikipedia

• building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

• bridge — bridge1 bridgeable, adj. bridgeless, adj. bridgelike, adj. /brij/, n., v., bridged, bridging, adj. n. 1. a structure spanning and providing passage over a river, chasm, road, or the like. 2. a connecting, transitional, or intermediate route or… …   Universalium

• Cordwood construction — For the method of electronic component assembly, see Printed circuit board# Cordwood construction. A section of a cordwood home. Cordwood construction (also called cordwood masonry, stackwall construction or stackwood construction ) is a term… …   Wikipedia

• Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …   Wikipedia

• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

• Technological and industrial history of Canada — The technological and industrial history of Canada encompasses the country s development in the areas of transportation, communication, energy, materials, public works, public services (health care), domestic/consumer and defense technologies.… …   Wikipedia

• roads and highways — ▪ transportation Introduction       traveled way on which people, animals, or wheeled vehicles move. In modern usage the term road describes a rural, lesser traveled way, while the word street denotes an urban roadway. Highway refers to a major… …   Universalium

• Rapid City, South Dakota — City of Rapid City   City   Downtown Rapid City …   Wikipedia