Concrete

**Concrete:** Is a manufactured mixture of cement and water, with aggregates of sand and stones, which hardens rapidly by chemical combination to a stonelike, water-and-fire-resisting solid of great compressive but low tensile st rength.

**Reinforced concrete:** was developed to add the tensile strength of steel to the compressive strength of mass concrete. Permits the erection of vast vaults and domes with a concrete and steel content so reduced that the thickness is comparatively less than that of an eggshell.
 * concrete-shell construction: **

 ** Reinforced concrete: ** ** ** prestressed concrete: ** **// What is the difference between tiltwall construction, tilt-up panel construction and pre-cast concrete construction? //**
 * Pre-cast concrete:

 Tilt-up and tiltwall are two terms used to describe the same process.   <span style="font-size: 12pt; font-family: Arial,Helvetica,sans-serif; color: rgb(246, 107, 9);">The process is similar for tiltwall and precast concrete, but to tilt wall the climatic factor is very determinant because the walls are created by assembling forms and pouring large slabs of concrete called panels directly at the job site, but concrete tilt-up walls are poured outdoors, so contractors are at the mercy of climatic conditions is also beneficial because transportation panels isn´t required. The proces of Precast concrete is very similar to tiltwall but For precast concrete buildings, work crews do not set up forms at the job site to create the panels, workers pre cast concrete panels at a large manufacturing facility, their problem is than is necessary transporting the panels, which are heavy and if is a larg distance is more complicated.