Some recent developments in concrete construction materials offer new possibilities. Portland cement, the primary component of concrete, is difficult to manufacture and costly. Lowering its cost is, however, possible through the use of vertical instead of rotary kilns. Fly ash and other waste silica can be used as substitutes. Synthetic aggregates often replace mineral aggregates in concrete to advantage. The weight of concrete is also reduced by foams and internal chemical reactions, and its strength increased by polymerization. Polymer latex modified mortars provide raised bond strength and resistance to chemicals. Elimination of shrinkage cracking is ensured by expansive cements. Random distributed steel or glass fibers can double the tensile strength of concrete. Ferro-cement made of closely layered wire meshes and cement mortar is used successfully for boat hulls. Regulated set cements are used to control setting time and for early strength.
|Original language||English (US)|
|Number of pages||8|
|Journal||J Assoc Eng Archit Isr|
|State||Published - Jan 1 1975|
ASJC Scopus subject areas