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38 gm pycnometer filled with water mass c 16652 gm

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Saturated surface dry mass (B) = 166.38 gm Pycnometer filled with water mass (C) = 1665.2 gm Pycnometer filled with water & sample mass (D) = 1768.02 gm Bulk dry specific gravity = A/ (C+B-D) = 165.77/ (1665.2+166.38-1768.02) = 2.61
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Bulk SSD specific gravity = B/ (C+B-D) = 166.38/ (1665.2+166.38-1768.02) = 2.62 Apparent specific gravity = A/ (C+A-D) =165.77/ (1665.2+165.77-1768.02) = 2.63 Absorption ratio = ((B-A)/ A) * 100% = ((166.38-165.77)/ 165.77) * 100% =0.37% CONCLUSION: The ASTM standards show the acceptable ranges for the specific gravity. The specific gravity should lie between (2.36 -3.5) for coarse aggregate, and for fine aggregate it lie between (2.3- 4.5), and our result for coarse aggregate it satisfy the acceptable ranges, we get 2.62 for FOLIYEA aggregate and 2.73 for HUMOSIEYA aggregate, and our result for fine aggregate it satisfy the acceptable ranges, we get 2.78 for ADASIYEA aggregate and 2.63 for SAND aggregate. and The absorption values ranges between (0.00% - 5.00%), and our results for coarse aggregate for HUMOSIEYA 4.62% and for FOLIYEA 2.33%. and our results for FINE aggregate for ADASIYEA 4.51% and for SAND 0.37% for our values are lie between the range So we can conclude that our results were reasonable & similar to the real values, although we 8 don’t have systematic error in this experiment but we expect have random error. But often there some common systematic error that happened in this experiment. for example, the Pycnometer maybe not filled correctly to the calibrated mark and that affect on the mass taken, some free water on the surface was not completely dried by the piece of cotton, the readings maybe not taken accurately from the balance or other instruments, or maybe the basket which submerged in water was not filled completely to calibrated mark. ENGINEERING USE : the strength of the aggregate depends on their water absorption . Absorption values are used to calculate the amount of water that is absorbed by aggregates during Portland cement concrete mix (PCC). So that, the study of the specific gravity and absorption of coarse and fine aggregates is important to the development of satisfactory mix designs for hot mix asphalt (HMA) and for PCC. References: 1) Building materials, d. Mohammed Abbas, Abdul Haq, Birzeit University.
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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. 4) American cement manufactory (1916). ( ). 9
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