losing slump flow before the formwork is completely filled. Using self-consolidating concrete in vertical and overhead applications has become an accepted and proven concrete repair method. Based on the orientation of the repair, pumping self-consolidating concrete can be the required method of placement for this material. However,
varying slump loss during pumping. This would provide for a slump higher than 4 in. at the point of delivery to obtain 4 in. slump at the end of the pumpline. Once the slump loss during pumping can be determined, acceptance or rejection of concrete based on slump can then be determined at the delivery point. For example, if a 1-1/2 in.
Workability Requirements for Concrete in Bored Pile
The most popular measure of workability of concrete is slump test. It shall be conducted for each truck load. Following standard discussed below should be followed unless other requirements are posed measuring of slump during discharging concrete into pile shaft or during discharge into hopper of concrete pump.
Mix Design for Pumped Concrete with PPC, OPC, OPC+Flyash
The workability of pumped concrete in general has an average slump of between 50 mm and 100 mm. A concrete of less than 50 mm slump is impractical for pumping, and slump above 125 mm should be avoided. In mixtures with high slump, the aggregate will segregate from the mortar and paste and may cause blocking in the pump lines.
What is the slump value for pouring the mass concrete with
Dec 01, 1989 · Unless otherwise permitted or specified, the concrete should be proportioned and produced to have a slump of 4 inches or less if it's to be consolidated by vibration. If it's consolidated any other way, the slump should be 5 inches or less.
What is the slump required for pile concrete? - Quora
Answer (1 of 19): The concrete mixes and its proportions are usually selected depending on the placing conditions. As specified in is 456 for concreting for shallow sections and pavements the workability of concrete required is very low where compacting factor test is usually adopted to find the
Mix Design and Pumped Concrete - Civil Engineering Portal
Slump is a measure of concrete consistency or fluidity. Consistency is the ability of freshly mixed concrete to flow. For given proportions of cement and aggregates (without admixtures), the higher the slump, the wetter the mix. Four-inch (4") slump is very common with normal weight concrete and is a good average slump for pumping.
Concrete Class Minimum, % Desired, % Maximum, % A, C, E, F & H 5.0 6.5 8.0 D 6.0 7.5 9.0 G, I & J 4.0 6.0 8.0 C. Water. Water shall be added in amounts that are required to obtain the slump specified by the 40 Engineer within the general limits of Table 501-5, Slump Values. The slump of concrete shall be
Concrete Q & A: Maximum versus Nominal Slump Requirements
Aug 01, 2004 · Section 3300 of the specifications for 4000 psi (27 MPa) air-entrained concrete indicates a 4-in.-maximum (100 mm) slump, but a note on the blueprints for a wall to be placed using 4000 psi (27 MPa) air-entrained concrete on the same project indicates a 4-in.-nominal (100 mm) slump. I know that a 4-in.-maximum slump means just that—a 4 in
The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
slump at the pump, the plasticizer content should be reduced so as to produce a 25 to 50 mm (1 to 2 in.) slump. The air-entraining admixture is then incorporated to produce the slump required for pumping, typically between 75 and 150 mm (3 to 6 in.). Remember that the slump killing effect works best if there is a high initial air content at
Allied Ready Mix Concrete utilizes superplasticizers to achieve slumps up to 170mm without compromising concrete strength or set time when used with any of our concrete mix designs. Concrete is often specified at a slump of 80mm +/- 20mm or less. These slumps are typically too low to ensure proper placement.
Concrete PUMPING CUTTING & GRINDING NEW METHODS | …
The required slump depends on the pump, hose diameter, and distance, particularly height. Boom pumps with a six inch pump reduced to a four inch discharge tube and hose will handle pea gravel or small coarse aggregate mixes at slightly less than a four inch slump, but that is pushing the limit. Larger aggregate mixes may require a five inch slump to maintain flow, especially if the concrete is being lift …
Aug 02, 2017 · The Minimum Slump Required for Pumping Concrete. Concrete work is very specific. We concrete work is not done well, when it is not done with precision and when it is not properly researched, things tend to go very bad. Each and every last one of us have seen bad concrete work. It is easy to get laying concrete wrong.
the same slump the concrete had at the lower tempera t u r e. Mi x i n g . To achieve a uniform c o n c r ete batch, ASTM C 94 re q u i re s a minimum of 70 to 100 re vo l u t i o n s at mixing speed. Because it's diffi-cult to obtain uniform concrete in an overloaded mixer, the volume of
Recommendations for Pumping Self-Consolidating Concrete
• Maintain the concrete slump flow (Figure 2) between 600 mm and 700 mm (24 inches and 28 inches) at the exit of the pump hose, in order to promote proper consolidation. If the slump flow is below 600 mm (24 inches), the self-consolidating concrete may not be …
SPECIFICATIONS FOR REINFORCED CAST-IN-PLACE CONCRETE
The concrete mix design(s) for the required type(s) of concrete shall specify the following: .1 Cementitious content in kilograms per cubic metre or equivalent units for each type of cementitious material. .2 Designated size, or sizes, of aggregates, and the gradation. .3 Aggregate source location(s).
Mix Design for Pumpable Concrete | Materials | Concrete
(a) It should have minimum fine particles smaller than 0.25 mm in size (cement + fine aggregate), approximately 400 kg/m 3 of concrete for the max size of 32 mm of coarse aggregate. In case of very angular and flaky aggregate, the quantity of fine aggregate may be increased by 10%.
Maximum Permitted Slump When Slump - Concrete Construction
slump or too little, aggregates that a re too absorptive or perhaps too l a r ge for the pump or pipeline. Coarse aggregate For pumpable mixes, the maxi-mum size of coarse aggre g a t e should be limited to 33 percent of the minimum opening in either the pump or the pipeline. For we l l - …
A properly designed mixture possesses the desired workability for the fresh concrete and the required durability and strength for the hardened concrete. Typically, a mix is about 10 to 15 % cement, 60 to 75 % aggregate and 15 to 20 % water. This concrete mix ratio of aggregate to sand to cement is an important factor in determining the