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PCC Properties Used in Comparison of Conventional JPCP with Composite PCC/JPC Pavement for US-14 Section Using MEPDG Design Feature Conventional JPCP Composite PCC/JPC Slab thickness 9 in. 3-in. high-quality concrete (granite aggregate) 6-in. low-cost concrete (50% RCA, 60% fly ash substitution) Joint spacing and load transfer 15 ft 1.25-in ...
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Aggregate is classified as two different types, coarse and fine. Coarse aggregate is usually greater than 4.75 mm (retained on a No. 4 sieve), while fine aggregate is less than 4.75 mm (passing the No. 4 sieve). The compressive aggregate strength is an important factor in the selection of aggregate.
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Surface course: This is the top layer, which consists of the PCC slab. Base course: This is the layer directly below the PCC layer and generally consists of aggregate or stabilized subgrade. Subbase course: This is the layer (or layers) under the base layer. A subbase is not always needed and therefore may often be omitted. Structural Elements
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The size of fine aggregate particles is less than 4.75mm. Why is the replacement material required instead of coarse aggregate? The cement, sand & coarse aggregates are the vital material in construction. At present, a structure can not be constructed without those materials. In concrete, the aggregate occupies
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• 100 to 175 mm (4 to 7 in.) – Primary roads and interstate highways • 175 to 280 mm (7 to 11 in.) – Large airports • 200 to 460 mm (8 to 18 in.) Whitetopping - Advantages Construction • Can place on pavement in bad condition. – Little or no pre-overlay repair needed. • Avoid reconstruction problems. – Minimal rain delays.
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In the same way, 10 mm, 20 mm and 40 mm aggregates shall be combined in the ratio of 1:1.5:3 to get a 40 mm graded coarse aggregate. Fine aggregate of Zone II as per IS: 383-1970 is generally suitable for pumped concrete provided 15 to 30% sand should pass the 300 micron sieve and 5 to 10 percent should pass the 150 micron sieve.
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The grading of aggregates is the determination of the aggregate size used for construction works. The coarse aggregate is graded as per its size (10mm, 12mm & 20mm). The selection of the right coarse aggregate size depends on the specific construction activity. You will understand how grading of aggregates influences the bondage in concrete ...
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The size of the aggregate used for PCC varies from 10-12 mm to 40 mm depending on where they are to be used. If the size of the aggregate is more, it results in the reduction of cement consumption. Coarse aggregate shall be clean and free from elongated, flaky or laminated pieces.
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Answer (1 of 2): I don't know, why we using 40 mm CA for First PCC concrete below footing,,, why we shouldn't use 20mm for that . what is the difference between 20 mm pcc and 40 mm pcc ?
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PCC Patching. Rigid pavement patches are used to treat localized slab problems such as spalling, scaling (e.g., reactive aggregate distress, over-finishing the surface), joint deterioration, corner breaks or punchouts. If the problem is limited in depth, then a partial depth patch may be appropriate, otherwise a full depth patch is recommended.
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Coarse aggregate used in the PCC must be of hard broken stone of granite or similar stone, free from dust, dirt and other foreign matter. The stone ballast shall be 20 mm in size and smaller. All the coarse material should be retained in a 5mm square mesh and should be well graded so that the voids do not exceed 42%.
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For maximum aggregate sizes less than 50 mm (2 inches), each test is conducted on a 152 x 152 x 508 mm (6 x 6 x 20 inch) PCC beam (see Figures 3 and 4). The beam is supported on each end and loaded at its third points (for the third-point loading test) or at the middle (for the center-point loading test) until failure.
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So compressive strength of m7.5 grade of concrete is 7.5N/mm^ 2 and mix ratio in m7.5 grade of concrete is about 1:4:8 in which one part is cement 4 Part is sand and 8 part is aggregate. cement consumption in PCC 1:4:8. Suppose we have project of making concrete pavement of area 100m2 and slab thickness of PCC is 150 mm. Area = 100 sq.m
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The other five agencies and their considerations are listed in Table 2-3. 23% 15% 35% 31% 12% 31% 31% 6 4 9 8 3 8 8 0 10 20 0% 20% 40% 60% 80% Number of Responses Percentage of Survey Respondents 26 survey respondents Marginal (out of specification) aggregate Marginal (out of specification) recycled aggregate Quarry byproduct (less ...
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Where 1 signifies the ratio of cement, 2 signify the ratio of sand (fine aggregate) and 4 for coarse aggregate (crushed stone). Dry volume = wet volume x 1.54. Determine crushed stone, cement and sand in PCC work. Concrete ratio is 1:2:4. Material is equal to material ratio/ratio sum x dry volume. Cement is equal to 1/1 + 2 + 4 x wet volume x 1.54
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shows these limits for fine aggregate and for one size of coarse aggregate. There are several reasons for specifying grading limits and nominal maximum aggregate size; they affect relative. 82. Design and Control of Concrete Mixtures EB001. Fig. 5-4. Range of particle sizes found in aggregate for use in concrete. (8985) Fig. 5-5.
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Aggregate No dowels interlocking High stresses High deflections Pavement distresses Traffic direction Aggregate Interlock Loss of support ... PCC thickness (mm) Distance to free edge (mm) 3000 3600 4800 7200 225 1050 875 650 425 250 950 775 600 400 275 850 725 525 350 300 775 650 500 325 Bar diameter: 16 mm ...
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Coarse aggregate used in the PCC must be of hard broken stone of granite or similar stone, free from dust, dirt and other foreign matter. The stone ballast shall be 20 mm in size and smaller. All the coarse material should be retained in a 5mm square mesh and should be well graded so that the voids do not exceed 42%.
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Answer (1 of 3): I guess your question is why is Silt considered to be undesirable in fine aggregate used in making concrete. So answering for the same.. Silt is a fine material which is less than 150 micron. It is unstable in the presence of …
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233 cuft ( 3 tractor trolly) sand consumption in pcc 1:2:4 for 100m2 and 150 mm thick slab. aggregate quantity calculation in pcc 1:2:4. Part of aggregate in mix = 4/7. 1m3 = 35.32 cuft. Dry volume =23.1 m3. Volume of aggregate = (4/7)×23.1 × 35.32 cuft. Volume of sand = 466 cuft. if one tractor trolly has = approx =80 cuft
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