C 33099 Lightweight Aggregates for Structural Concrete . ... The fineness modulus shall be a minimum and a maximum of The fineness modulus for any ... The nominal maximum aggregate size shall be mm, or as specified in the Contract Documents.
CIP 36 Structural Lightweight Concrete. WHAT is Structural Lightweight Concrete. Structural lightweight concrete has an equilibrium density ranging from 90 to 120 lb/ft3 3(1440 to 1840 kg/m ) compared to normalweight concrete with a density in the range of 140 to 150 lb/ft 3 (2240 to 2400 kg/m ).
While choosing the maximum size of aggregate it should not be greater than onefourth of the minimum thickness of the structural member. Also it is restricted to 5mm less than the minimum clear distance between the main rebars or 5mm less than the minimum cover to the reinforcement.
Unless the plans show differently, the base under all concrete work shall be a minimum of 6 inches deep and shall be constructed of selected gravel or crushed stone of such size that will pass a 2 inch sieve and 98% will be retained on a No. 200 sieve.
When the maximumsize aggregate is 3 / 8 inch ( mm) or smaller, the test panels shall have minimum dimensions of 12 inches by 12 inches (305 mm by 305 mm). Panels shall be shot in the same position as the work, during the course of the work and by the nozzlemen doing the work.
Step 2, Choice of maximum aggregate size: If the maximum aggregate size is not specified, determine the maximum aggregate size for the mix. Take into consideration
Coarse aggregates are any particles greater than inch, but generally range between 3/8 and inches in diameter. Gravels constitute the majority of coarse aggregate used in concrete with crushed stone making up most of the remainder. Natural gravel and sand are usually dug or dredged from a pit, river, lake, or seabed.
NSCP Structural Design. STUDY. Flashcards. Learn. Write. ... Maximum size of course aggregate for narrowest dimension between side forms. 1/3. Maximum size of course aggregate for depth of slab. 3/4. Minimum clear spacing for course aggregate between individual reinforcing bars or wires, bundles of bars, or prestressing tendons or ducts ...
Jun 05, 2011· Dependant on the underlying surface the minimum you should use is 2 1/2 times the aggregate size. So for 20mm aggregate then 50mm is the thinnest you should use, 10mm agg and you can drop to 25mm.
The nominal maximum aggregate size is the smallest sieve size through which the majority of the sample passes (up to 15 percent can be retained). The bulk volume of the coarse aggregate is based on the dry rodded aggregate volume and empirical data related to workability and the FM of the sand. The fineness modulus (FM) of the fine aggregate is
Oct 01, 2016· Onefifth of the minimum dimension of the reinforced concrete member. The minimum clear spacing between reinforced bars or 5 mm less than the minimum cover between the reinforced bars and form, whichever is smaller for heavily reinforced concrete members such as the ribs of the main bars. Remember that the size shape of aggregate particles influence the properties of freshly .
(Concrete International, May 2002) reports that the average standard deviation for elevated slab thickness is in. ( mm) based on 3454 measurements. In developing the load and resistance factors for ACI 318, "Building Code Requirements for Structural Concrete," the slab thickness standard deviation was considered to be in.
Apr 12, 2015· I agree with Nafees Imtiaz Pial, 3/4" typical.
Standard Specifications for Tolerances for Concrete Construction and Materials, published by the American Concrete Institute, Detroit, Michigan, except as modified by the requirements of these Contract Documents. Adopted as a Standard of the American Concrete Institute in November 1989 in accordance with the Institute's standardization ...
(10 mm) will often have traces of aggregate measuring 1/2 in. ( mm), the minimum thick ness at which this shotcrete mixture should be placed is 1 1/2 in. (38 mm). In conclusion, the use of coarse aggregate in shotcrete mixtures will provide a wide range .
Plain Concrete – Structural concrete with no reinforcement or with less reinforcement than the minimum amount specified for reinforced concrete. Now that we have a vise grip understanding of this critical terminology, let's dig deep and root out some facts.
Concrete Technology Aggregates for Concrete Concrete Technology 21 Fineness Modulus (FM): Index of fineness of an aggregate. It is computed by adding the cumulative percentages of aggregate retained on each of the specified series of sieves, and dividing the .
Feb 11, 2017· Optimum max agg size for structural concrete is 25mm. Studies have shown that concrete's made with max agg size greater than 40mm have lower strength. Because of the smaller surface area for the bond between agg to paste. Volume changes in the paste causes larger stresses at the interface. 93.
concrete shall contain a minimum of 55 percent AASHTO M 43 size No. 67 coarse aggregate. Approved fly ash may be substituted for portland cement up to a maximum of 20 percent Class C or 30 percent Class F by weight. Class S50 concrete is a dense high strength structural concrete.
SELECTING PROPORTIONS FOR STRUCTURAL LIGHTWEIGHT CONCRETE Most concrete mixture proportions are reported with ag gregates in either saturated, surfacedry (SSD) condition or ovendry (OD) condition. But in the field, aggregates are usually in the airdry (AD) or wet condition.
require more reinforcing steel than the structural loads criterion. A minimum of 4,500psi concrete and Grade60 reinforcing steel are required for all secondary .
14 AGGREGATES In ordinary structural concretes, the aggregates occupy approximately 70% to 75% of the volume of the hardened mass. Gradation of aggregate size to produce 11 Concrete 12 The ACI Building Code 13 Cement and Water 14 Aggregates 15 Concrete Mixes 16 Concrete in Compression 17 Concrete in Tension 18 Reinforcing Steel
1102 AGGREGATES FOR CONCRETE SECTION 1102 AGGREGATES FOR CONCRETE ... QUALITY REQUIREMENTS FOR COARSE AGGREGATES FOR STRUCTURAL CONCRETE AND COARSE AGGREGATES FOR APPLICATIONS NOT PLACED ONGRADE ... Fine Aggregate Angularity, minimum 45 KT50 Moisture Content, maximum % KT11 (3) Product Control. ...
inch) includes normal weight aggregate high volume fly ash concrete, such as HVFAC having a 56day compressive strength of 4,000 psi, a maximum coarse aggregate size of 1 inch, with a minimum unit weight of 145 pounds per cubic foot (without reinforcement). C. The term "lightweight concrete" indicates lightweight structural concrete which has a
Fire resistance. The value of may be taken as 50% of the actual length for intermediate floors and between 50% and 70% of the actual length for the upper floor column. 2 The first order eccentricity under fire conditions should be < (or h). Alternatively use .