| Autor: |
Kagan, M. Z., Belonozhko, V. M. |
| Zdroj: |
Power Technology and Engineering (formerly Hydrotechnical Construction); November 1991, Vol. 25 Issue: 11 p698-700, 3p |
| Abstrakt: |
Conclusion A comparison was made of the water absorption of two fiber-reinforced concrete blocks with different geometric parameters of the fibers. It was found that in the case of using thin fibers d=0.5 mm (block No. 2), the water absorption by weight was less and it was distributed more uniformly over the entire length than in the case of using fibers with d=1.5 mm (block No. 1). A dependence of the coefficient of variation on Ww was established (a decrease of Ww causes a decrease of Cv and vice versa). This was displayed especially clearly in block No. 1 (thick fibers) and less so in block No. 2. Furthermore, it was found that the addition of thin fibers directly into the concrete mixer (into the mixed concrete) leads to their clumping and ultimately to the occurrence of “hedgehogs” in the concrete and to worsening of Ww. Clumping of fibers occurs little, if at all, when thick fibers are added to the concrete mixer. Precisely the addition of fibers to the concrete mix is one of the most complex problems in the given area of construction. |
| Databáze: |
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