Early Egyptians and Greeks had only stone lintels, which had a limited tensile strength so distances spanned could only be relatively small. The Romans developed the semi-circular arch. Load is transferred down through constant columns to ground. As the arch is loaded, the stone will tighten up and bear greater load.
Concrete is strong in compression, however is generally weak in tension. Therefore when a load is placed upon it it may bend. To make sure this doesn’t happen, steel reinforcement is put in on the tensile face, normally the bottom edge if a floor or beam.
Tension can also occur outwards, so for example a basement [...]
Advantages
Good compressive strength
Familiar material to workforce
Ethnic – of the locality
Disadvantages
Poor tensile strength
Some stones decay
Need for skilled workforce
Maintenance cost – discolouration/cleaning
Sedimentary stone is not formed under pressure but in layers and can split off if vertically loaded. This can, however, be useful – eg slate
Some stone, such as marble, is too expensive for construction although may [...]
