Design a concrete mix for the construction of an elevated water tank. The target strength at...
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Design a concrete mix for the construction of an elevated water tank. The target strength at 28 days is 60 MPa measured on standard cylinders. The specific gravity of fine and coarse aggregates are 2.1 and 2.5, respectively. The coarse aggregate is crushed single sized 20 mm aggregate. Fine aggregate is crushed sand with a fineness modulus of 2.46. The Surface Saturated Density (SSD) of coarse and fine aggregates are 2680 kg/m3 and 2610 kg/m3, respectively. Ordinary Portland cement (Type I) will be used. A slump of 80 mm is necessary. If the amount of concrete required for a single pouring is 5m3, what is the amount of each constituent for this pour? All tables and graphs for the mix design are provided below. Table 2 Approximate compressive strengths (N/mm2) of concrete mixes made with a free-water/cement ratio of O.5 Compressive strengths (N/mm2) Age (days) Cement Туре of *............. ..... . .... strength coarse class aggregate 7 28 91 42.5 Uncrushed 22 30 42 49 Crushed 27 36 49 56 52.5 Uncrushed 29 37 48 54 Crushed 34 43 55 61 Throughout this publication concrete strength is expressed in the units N/mm?. 1 N/mm? - 1 MN/m? = 1 MPa. (N = newton; Pa = pascal.) Throughout this publication concrete strength is expressed in the units N/mm?. 1 N/mm? = 1 MN/m² = 1 MPa. (N = newton; Pa = pascal.) Table 3 Approximate free-water contents (kg/m) required to give various levels of workability Slump (mm) 0-10 10-30 30-60 60-180 Vebe time (s) >12 6-12 3-6 0-3 Maximum size of aggregate Туре of (mm) aggregate 10 Uncrushed 150 180 205 225 Crushed 180 205 230 250 20 Uncrushed 135 160 180 195 Crushed 170 190 210 225 40 Uncrushed 115 140 160 175 Crushed 155 175 190 205 Note: When coarse and fine aggregates of different types are used, the free-water content is estimated by the expression: 3 W, + 'a W. where W, = free-water content appropriate to type of fine aggregate and W. = free-water content approporiate to type of coarse aggregate. 90 Starting line using data from Table 2 80 70 60 20 10 Figure 4 Relationship between compressive strength and free-water/cement ratio 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Free-water/cement ratio Compressive strength (N/mm2) 2700- Relative density of combined aggregate (on saturated and surface-dry basis) -2600 2500 2.9 Assumed for crushed aggregates 2.8 2.7 Assumed for uncrushed aggregates 2400 2300 2.6 2.5 2200 2.4 2100 100 160 180 200 220 240 260 280 120 140 Free-water content (kg/m) Figure 5 Estimated wet density of fully compacted concrete Wet density of concrete mix (kg/m3) Maximum aggregate size : 10 mm Slump : 0-10 mm Vebe : 12s 10-30 mm 6-12s 30-60 mm 3-6s 60-180 mm 0-3s 80 70 Fineness modulus 3.5 60 3.5 3.0 50 3.0 2.5 40 2.5 2.0 20 30 1.5 1.5 20 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 Free-water/cement ratio Maximum aggregate size : 20 mm Fineness modulus 50 3.5 3.5 40 3.0 3.0 25 2.0 1.5 2.5 30 2.0 20 1.5 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 Free-water/cement ratio Maximum aggregate size : 40 mm 80 70 Fineness modulus 3.5 3.5 3.0 3.0 25 20 15 25 2.0 20 1.5 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 Free-water/cement ratio 0.8 0.4 0.6 0.8 Percentage of fine aggregate ardar9se auy jo asejuassad Design a concrete mix for the construction of an elevated water tank. The target strength at 28 days is 60 MPa measured on standard cylinders. The specific gravity of fine and coarse aggregates are 2.1 and 2.5, respectively. The coarse aggregate is crushed single sized 20 mm aggregate. Fine aggregate is crushed sand with a fineness modulus of 2.46. The Surface Saturated Density (SSD) of coarse and fine aggregates are 2680 kg/m3 and 2610 kg/m3, respectively. Ordinary Portland cement (Type I) will be used. A slump of 80 mm is necessary. If the amount of concrete required for a single pouring is 5m3, what is the amount of each constituent for this pour? All tables and graphs for the mix design are provided below. Table 2 Approximate compressive strengths (N/mm2) of concrete mixes made with a free-water/cement ratio of O.5 Compressive strengths (N/mm2) Age (days) Cement Туре of *............. ..... . .... strength coarse class aggregate 7 28 91 42.5 Uncrushed 22 30 42 49 Crushed 27 36 49 56 52.5 Uncrushed 29 37 48 54 Crushed 34 43 55 61 Throughout this publication concrete strength is expressed in the units N/mm?. 1 N/mm? - 1 MN/m? = 1 MPa. (N = newton; Pa = pascal.) Throughout this publication concrete strength is expressed in the units N/mm?. 1 N/mm? = 1 MN/m² = 1 MPa. (N = newton; Pa = pascal.) Table 3 Approximate free-water contents (kg/m) required to give various levels of workability Slump (mm) 0-10 10-30 30-60 60-180 Vebe time (s) >12 6-12 3-6 0-3 Maximum size of aggregate Туре of (mm) aggregate 10 Uncrushed 150 180 205 225 Crushed 180 205 230 250 20 Uncrushed 135 160 180 195 Crushed 170 190 210 225 40 Uncrushed 115 140 160 175 Crushed 155 175 190 205 Note: When coarse and fine aggregates of different types are used, the free-water content is estimated by the expression: 3 W, + 'a W. where W, = free-water content appropriate to type of fine aggregate and W. = free-water content approporiate to type of coarse aggregate. 90 Starting line using data from Table 2 80 70 60 20 10 Figure 4 Relationship between compressive strength and free-water/cement ratio 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Free-water/cement ratio Compressive strength (N/mm2) 2700- Relative density of combined aggregate (on saturated and surface-dry basis) -2600 2500 2.9 Assumed for crushed aggregates 2.8 2.7 Assumed for uncrushed aggregates 2400 2300 2.6 2.5 2200 2.4 2100 100 160 180 200 220 240 260 280 120 140 Free-water content (kg/m) Figure 5 Estimated wet density of fully compacted concrete Wet density of concrete mix (kg/m3) Maximum aggregate size : 10 mm Slump : 0-10 mm Vebe : 12s 10-30 mm 6-12s 30-60 mm 3-6s 60-180 mm 0-3s 80 70 Fineness modulus 3.5 60 3.5 3.0 50 3.0 2.5 40 2.5 2.0 20 30 1.5 1.5 20 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 Free-water/cement ratio Maximum aggregate size : 20 mm Fineness modulus 50 3.5 3.5 40 3.0 3.0 25 2.0 1.5 2.5 30 2.0 20 1.5 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 0.8 Free-water/cement ratio Maximum aggregate size : 40 mm 80 70 Fineness modulus 3.5 3.5 3.0 3.0 25 20 15 25 2.0 20 1.5 0.4 0.6 0.8 0.4 0.6 0.8 0.4 0.6 Free-water/cement ratio 0.8 0.4 0.6 0.8 Percentage of fine aggregate ardar9se auy jo asejuassad
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Intermediate Accounting
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10th Edition
Authors: Loren A Nikolai, D. Bazley and Jefferson P. Jones
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