The strength of concrete is measure in terms of pounds per square inch (or PSI). PSI is a measure of compressive strength, or the ability of the material to carry loads and handle compression. 1.) PSI

For purposes of establishing concrete proportions and calculating yields, we will not concern ourselves with bulk yield or bulk volumes of aggregate, cement, etc., but ... Design Min. Laboratory Compressive Strength at 28 days (f'c) (psi) Aggregate Size No. 6 Design Max. .

of a typical 3500psi concrete mix also are show n . • Cementitious materials 1% ... Slump adjustment is a fact of life for concrete contractors, but they should follow these guidelines for its use ... • Decrease compressive strength 150 to 200 psi

strength by more than 500 psi (or by more than times the specified strength for specified strengths greater than 5000 psi), ACI 31808, "Building Code Requirements for Structural Concrete," requires that steps shall be taken to assure that loadcarrying

Use of HighStrength Concrete in Prestressed Concrete Box Beams for Highway Bridges JOHN J. SCHEMMEL AND PAUL ZIA A study was conducted to determine the structural and economic benefits of using highstrength (6,000 to 12,000 psi) concrete in ... use of highstrength concrete in highway bridge applications.

The strength of concrete that you use is regional, industry, and schedule driven. ... and isn't worried because, with the admixtures, it will be 3,000 psi eventually. You should use a strength that is normal for your region because it is economical. RE: 3000 psi vs 4000 psi concrete PicoStruc (Structural) 7 .

For any concrete use requiring high early strength and rapid strength gains where superior workability is desired. Profinish 5000 sets quickly, making it ideal for cold weather applications.

Sep 27, 2006· 3000 psi is fine for a sidewalk. Concrete continues to strengthen long after is poured and cured. Sidewalks genereally do not carry a load and don't need the additional strength.

Feb 25, 2007· Forget about the strength of the concrete that is there. Your eally do not know how consistant it is and how uniform the thickness is. ... Then he can pour using bagged concrete mix (3000 psi would be adequate). If you really need them 3' square, put 3 or 4 rebars (1/2") each way.

stated, no structural concrete can be specified with a strength less than 2500 psi. Other properties of the concrete can be significant for concrete exposed to freezethaw conditions, sul fate exposure and chloride exposure (effects of chlorides on the corrosion of the reinforcing steel).

Sakrete High Strength Concrete Mix is a preblended mixture of sand, coarse aggregate, and cementitious materials. For new construction or repairs where concrete thickness exceeds 2 in. Use for: driveways, patios, foundations walls and footings, curbs, stairs and structural applications requiring a small volume of concrete

Since all concrete masonry units complying with ASTM C90 (ref. 7) have compressive strengths exceeding 1,900 psi ( MPa), by the unit strength method any C90 unit used

The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength.

According to the Code this would require a block compressive strength of 1900 psi. Recently on projects, some designers are now specifying a higher f'm,, 2000 psi, 2500 psi and 3000 psi with Type S mortar. According to the Code this would require a block compressive strength of 2800 psi, 3750 psi and 4800 psi, respectively.

Sep 18, 2007· RE: 3000 psi or 5000 psi concrete JKW05 (Structural) 17 Sep 07 15:40 ACI has some requirements for higher strength concrete for special exposures; low permeability or exposure to freezing, deicing agents, seawater, etc.

CIP 33 High Strength Concrete WHAT is High Strength Concrete? ... It is a type of high performance concrete generally with a specified compressive strength of 6,000 psi (40 MPa) or greater. The compressive strength is mea ... to ensure the success of projects using high strength concrete. During construction, extra measures should ...

Dec 06, 2009· Concrete strength is measured in psi. Typically, the required strength of concrete is specified by the architect or engineer, or if there is none, by the minimum required in the building code. Strength is typically specified at 28 days, meaning in theory the concrete is allowed to cure for 28 days, then its strength in psi is measured using a ...

Oct 23, 2009· Concrete compressive strength requirements can vary from 2500 psi (17 MPa) for residential concrete to 4000 psi (28 MPa) and higher in commercial structures. Higher strengths up to and exceeding 10,000 psi (70 MPa) are specified for certain applications.