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Standard Practice for Selecting Proportions for. Normal, Heavyweight, and Mass Concrete (ACI ). Reported by ACI Committee Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete (ACI ) (Reapproved ) Reported by ACI Committee ACI Standard Practice for Selecting Proportions for Normal, Heavyweight, And Mass Concrete - Free download as PDF File .pdf), Text File . txt) or read.

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Aci 211.1 91 Pdf

ACI - Download as PDF File .pdf), Text File .txt) or read online. ACI Concrete is composed principally of aggregates, a portland or blended cement, and water, and contain other cementitious materials and/or chemical. ACI Committee Publication Year: Pages: ISBN: Categories: Mixture Proportioning. Formats: Printed Document or PDF.

Sieve Percent percent gravity, retained percent size, Opening, retained retained by SSD by retained by no. Most concrete mixture proportions are reported with ag- proportion of coarse aggregate should approach the maxi- gregates in either saturated, surface-dry SSD condition or mum consistent with workability and placeability, unless oven-dry OD condition. But in the field, aggregates are tests indicated that a lesser proportion provides optimum usually in the air-dry AD or wet condition. However, light- characteristics. Most In some cases, strength may be increased by reducing the structural lightweight aggregate concrete mixture propor- nominal maximum size of the aggregate without increasing tions are reported in the oven-dry condition. However, in the the cement content. This condition is usually achieved by sprinkling, soaking, ther- 2. The result is some- ties of fractions retained on the different sieve sizes are nearly times referred to as the as-is condition, [Fig. Percentages retained on each size indicated by weight The main problem for the concrete technologist is to have give a true indication of percentages by volume. However, the an easy method of using field data to convert the oven-dry bulk specific gravity of the various size fractions of light- laboratory trial proportions to proportions in the as-is weight aggregate usually increases as the particle size decreas- moisture condition. Some coarse aggregate particles may float on water, whereas material passing a No. It is 2. A material retained on each sieve, that determines the void con- well-graded aggregate will have a continuous distribution of tent and paste content, and influences workability of the con- particle sizes producing a minimum void content and will re- crete. Percentages retained on each sieve and fineness quire a minimum amount of cement paste to fill the voids. Conversely, concrete con- size distribution by volume.

Carrasquillo Alan C. Carter Martyn T. Conrey James E. Cook Russel A. Cordon Wayne J. Costa Edward A. James E. Bennett, Jr. Cook-t Russell A. Cook David A. Crocker Kenneth W. Fox Donald A. Graham George W. Hollon William W. Hotaling, Jr. Robert S. Jenkins Paul Klieger Frank J.

Lahm Stanley H. Lee Gary R. Bell" Calvin L. Dodl Richard W. Narva Paul R. Stodola Stanley J.

BIas, Jr. Thomas A. Fox Leo P. Nicholson Michael A. Taylor Ramon L. Carrasquillo Donald A. Graham James E. Olivenon Stanely J. Vigalitte Peggy M. Carrasquillo George W. Hollon James S.

Pierce William H. Voelker Alan C.

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Carter William W. Hotaling, Jr. Sandor Popovics" Jack W. Weber" Martyn T. Conrey Robert S.

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Jenkins Steven A. Ragan Dean J. White II James E. Cook Paul K1ieger Harry C. Robinson Milton H. Willis, Jr. Russel A. Cook" Frank J. Lahm Jere H.

Rose" Francis C. Cordon Slantey H. For use with lightweight coarse aggregate and normal weight fine aggregate. It enhances workability, im- the specific gravity factor of lightweight coarse aggregate, as proves resistance to freeze-thaw cycles and deicer chemi- discussed in Appendix A, from which the first estimate of the cals, decreases bleeding, and tends to obscure minor grading weight of fresh lightweight concrete can be made.

Addition- deficiencies. When severe exposure is not anticipated, its use ally, the absorption of lightweight coarse aggregate may be may be waived, but the beneficial effects of air entrainment measured by the method described in ASTM C or by the on concrete workability and cohesiveness are desirable and spin-dry procedure discussed in Appendix B, which permits can be achieved at air contents of not less than 4.

ACI 211.1-91 Standard Practice for Selecting Proportions for Normal, Heavyweight, And Mass Concrete

Entrained air also lowers the unit weight of the concrete by 3. The weight aggregate concrete that may be subjected to freezing question of suitability is frequently not left to the individual and thawing or to deicer salts is 4 to 6 percent air when max- who selects the proportions.

Minimum cement or cementitious materials content 2. Air content by high air contents. At normal air contents 4 to 6 percent , 3. Slump the reduction is small if slumps are 5 in. Nominal maximum size of aggregate 2. Type of placement pump, bucket, belt conveyor, etc. Recommended average total air content, percent, for level of 8. Other requirements such as strength overdesign, ad- exposure mixtures, and special types of cement and aggregate. Mild exposure 4.

These quantities of mixing water are for use in computing cement or cementitious materials content for trial batches at 68 to 77 F. They are maximum for reasonably Step 2: Choice of nominal maximum size of lightweight well-shaped angular aggregates graded within limits of accepted specifications.

The aggregateThe largest nominal maximum size of well- use of water-reducing chemical admixtures ASTM C may also reduce mixing water by 5 percent or more. The volume of the liquid admixtures is included as part graded aggregates has fewer voids than smaller sizes. The slump values of 7 to 11 in.

Generally, the nominal Additional recommendations for air content and necessary tolerances on air content maximum size of aggregate should be the largest that is eco- for control in the field are given in a number of ACI documents, including ACI , , , , and ASTM C 94 for ready-mixed concrete also gives air content nomically available and consistent with the dimensions of limits.

The requirements in other documents may not always agree exactly, so in pro- the structure. In no event should the nominal maximum size portioning concrete, consideration must be given to selecting an air content that will meet the needs of the job and also meet the applicable specifications. If the mortar volume will be substantially different from that deter- of forms, one-third the depth of slabs, nor three-quarters of mined in this recommended practice, it may be desirable to calculate the needed air the minimum clear spacing between individual reinforcing content by taking 9 percent of the actual mortar value.

These limita- tions are sometimes waived by the engineer if workability and methods of consolidation are such that the concrete can not necessarily reflected in strength since other compensat- be placed without honeycombing or voids. When high- ing factors may be involved. It is not greatly affected by the quantity of cement or tent should be used.

That is, the air content should be the cementitious materials.

ACI Mix Design

Table 3. This will inal maximum sizes of aggregate, with and without air en- avoid developing an overly optimistic estimate of strength trainment. Depending on aggregate texture and shape, on the assumption that average rather than extreme condi- mixing water requirements may be somewhat above or be- tions will prevail in the field. For additional information on low the tabulated values, but they are sufficiently accurate air content recommendations, see ACI Such differences in water demand are These volumes are selected from concrete.

For more workable concrete, such as may some- when various cementitious materials are used.