WRI states in Tech Facts 705 that two of the primary purposes for reinforcing slabs-on-ground are for shrinkage and temperature control. SFRC is an economical way of controlling cracks due to changes in temperature or volume changes as the concrete ages. For WWR or rebar to control these cracks positioning is important. Positioning is important when using WWR or rebar. WRI states that when on layer of reinforcement is used, it should not be allowed to be below middepth.
In general, positioning at ⅓ the depth below the surface is sufficient. This is extremely difficult with the common practice of using a LaserScreed™ to strike-off the concrete. This problem is eliminated with the use of SFRC since the fibers are randomly distributed throughout the concrete.
SFRC is an economical way of controlling cracks due to changes in temperature or volume changes as the concrete ages. For WWR or rebar to control these cracks positioning is important. Positioning is important when using WWR or rebar. WRI states that when on layer of reinforcement is used, it should not be allowed to be below mid depth. In general, positioning at ⅓ the depth below the surface is sufficient. This is extremely difficult with the common practice of using a Laser Screed™ to strike-off the concrete. This problem is eliminated with the use of SFRC since the fibers are randomly distributed throughout the concrete.
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