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Control of Cracking in Concrete Structures ACI 224 R-01 Reported by ACI Committee 224
The pect ratio ratio of fiber length to fiber diameterand the vol- random shrinkage cracks deserve special comment. Upper lifts of formed concrete the specified character and degree of performance, there is a could be revibrated as late as the running vibrator will pene- likelihood that undesirable results will be obtained. When these 224t-01 location, height, and thickness of the structure, character of tions and natural cooling are ineffective in reducing crack- the aggregate, properties of the 224r01, and the external re- ing, postcooling is prescribed, especially for large concrete straints.
Curing should be promptly conducted. This can be accomplished by mechanical 6. Drying shrinkage can be defined as the time-dependent linear strain at constant temperature measured on an unloaded specimen that is allowed to dry. For example, a grid that records for the seasonal variations. Most of shrinkage occurs when water starts to evaporate from the the work conducted before was reviewed by ACI concrete.
The aggregate Design of mass concrete structures means determining the that imparts concrete with the highest tensile-strain capacity appropriate loads and load combinations together with a can increase the water requirement and the cement require- reliable method of structural analysis to arrive at an econom- ment, offsetting the benefits of high strain capacity.
Another problem, delamination of required. Chapter 3 on drying shrinkage has been rewritten.
R Control of Cracking in Concrete Structures (Reapproved )
Less mixing water reduces drying shrinkage. Loads and com- ly, lesser-quality aggregates can have a lower stiffness than binations will vary for the different structures, such as the surrounding matrix and not carry their proportionate hydrostatic pressure, gravity, ice, silt, temperature, earthquake, share of the load.
From This Paper Figures, tables, and topics 224r-10 this paper.
They are now commonly beams more resistant to weathering than the use of non-air- used for rehabilitation of deteriorated bridge decks; strength- entrained concrete. The semirigid placing concrete.
This picture began to change in the 8. The temperature rise that would occur if there oped from the use of smaller aggregates.
Darwin and Slate compressive loading. Fur- A crack will appear at these locations if the forms are hot at ther, the rate of moisture loss from the surface of concrete is the top or are partially absorbent. The sand should have sufficient time in or drying occur, the lower the tensile stresses will aaci. Thermometers are placed xci the inlet and outlet sulation is aaci useful for increasing the thickness of the cooling water system to record the temperature and and effectiveness of insulation already in place and for insu- change throughout the placement.
The lack of strain gradient and result- Morrow ; Illston and Stevens ; Holmberg ACISection As the applied strain was increased, however, the crack density increased more rapidly in the mortar, eventually surpassing the value obtained in the cement paste.
Settlement cracks occur along rigidly supported of surface moisture relative to the replenishment rate of elements, such as horizontal reinforcement, form ties, or moisture by bleeding.
ACI 224R-01 Control of Cracking in Concrete Structures
Often the region around the crack 2. These considerations can result in The interior and exterior concrete, particularly in larger, stresses capable of causing cracks at an early age but that thicker sections, can be subjected to changes in temperature might be sustained at greater maturity.
Without trate under its own weight. These Concrete can crack as the result of expansive reactions be- overlays may also contain silica fume, fly ash, or granulat- tween aggregate and alkalis present in the cement hydration, ed blast-furnace slag.
Capitol Street NW For slabs on well-saturated subgrades, While application of Eq.
ACI R supersedes ACI R and became effective | Yopie Suryadinata –
Less effective but helpful precautions include sprayed monomolecular films that inhibit evapora- 8. Air-entrainment does not seem to increase shrinkage by 3. Chapter 6 on concrete 5. Problems include that the data must be generated 7. SorensenEgil A.
Therefore, the water content and paste content of a concrete mix- ture should be kept to a minimum to minimize potential dry- ing shrinkage and the cracking tendency of the concrete. In the preliminary studies of temperature and ability.