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 Information @ a Glance
         General
  • Inspired by the natural processes of the earth's crust, in the 19th century the first attempts in fabricating units (bricks) from sand and lime were made. In 1880 the German researcher Wilhelm Michaels finally succeeded in producing "artificial sandstone" by the action of steam under pressure.

        Process

  • The process of making sand lime brick was invented in Germany where it probably has had its greatest development.
  • In making Sand-Lime Brick, measured quantities of sand and lime were thoroughly mixed to a 3- 6 % water content and fed into areactor where the lime was converted from CaO to Ca(OH)2. After passing through a rod mill, the mixture was transferred to presses where bricks were pressed in die boxes.
  • The bricks were then loaded in quantities of 1335 onto cars which were fed into large (7-foot diameter, 75-foot long) steel autoclaves. Within each autoclave, 12 cars with 16,000 bricks were subjected to dry steam at 250 psi for 8 hours to create bricks of calcium silicate compounds. After cooling, the bricks were sorted and packaged into cubes of 500.

         Technology

  • Countries that constitute a major portion of the market share of trade in concrete are
    represented in the ISO technical committee ISO//TC 71 through their national institutes.
    The member countries of ISO/TC 71 includes countries like usa, china, England, Japan, brazil
    and Canada.
  • Due to the use of natural raw materials calcium silicate does not emit noxious substances and has negligible content of radioactive constituents.
  • By its nature calcium silicate acts as a buffer to heat and it can absorb water vapour from air with high relative humidity. At low humidity conditions this absorbed water is released as vapour back to the surrounding air. In this way calcium silicate contributes to comfortable and healthy living conditions.

        Market & Report

  • Canada's brick industry were not recorded until the late 1880's. Surveys indicated that at that time there were about 350 brickyards operating in Canada. In contrast, a survey in 1972 showed that clay bricks were being made at only 34 plants in Canada, half of them in Ontario.
  • In recent years the total number of bricks produced annually in Canada has been in excess of 800 million, valued at over 48 million dollars, with clay bricks accounting for about 64 per cent of the total, concrete bricks about 29 per cent, and the remainder sand-lime bricks.
  • By way of indicating the market for bricks in Canada it can be calculated that the industry's production would provide sufficient bricks in a year for the construction (should such a structure ever be required) of a wall over 6 feet high stretching from Halifax to Vancouver, a distance of 3475 miles.

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