Is a need of some voids that absorb water and let it

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is a need of some voids that absorb water and let it sink down to the interior of earth and should be in the range of (3-5%) , for example in the airport the voids ratio should be 4%,and in highway roads it should be 5% ,because of the high frequency and traffics in highways compared to the airports. The average for the rate of aggregate voids filled with bitumen was (49.35%) and it is not in the range of acceptable value (75.82%), due to some errors in our experiment mentioned below. Marshall Stability (Number of blows =2 * 75) 9.00 KN Flow value (in 0.254-mm unit) 8-16 units (2-4 mm) Voids in total mix, VTM 3-5 % Aggregate voids filled with bitumen binder, VFB 75-82 % The qualities of the results produced by this standard test are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used, so some errors must have happened; some of them are listed below.
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Sources of error: 1. May the materials become cold while we were using them; also maybe the bitumen was cooled before the sample was mixed with it. So, the mixture may be non-homogeneous. 2. The bitumen was hot and so it was hard to deal with. 3. May some of bitumen stayed on the container of mixing and its arm. 4. Losing some of mineral filler (dust) during transferring it and mixing aggregate mixture. 5. Some errors may accrue in readings of the gauges while applying load to do the stability and the flow tests, and when weighting the samples. 6. May the samples did not compact as well as we need. References: 1) Building materials, d. Mohammed Abbas, Abdul Haq, BirZeit University. 2) Technology and properties of concrete, d. Spiritual Sharif, Oman 0.1982. 3) Building materials and tests, d. Mohammed Stas and d. Andrew Saud, Damascus University.
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6.References: 1) Construction Materials Laboratory, d. Mustafa Abedmosa, Bir Zeit University. 2) Neville, A. M., & Brooks, J. J. (1987). Concrete technology ( Second Edition). Harlow, Essex, UK: Longman Scientific & Technical.
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