ACI 231R-10 - Report on Early-Age Cracking: Causes, by ACI

By ACI

Early-age cracking is a problem for the concrete undefined. fabrics choice, environmental stipulations, and box practices all have massive effect at the propensity for early-age cracking to take place. This record makes a speciality of thermal- and moisture-related deformations; either are materials-related and give a contribution to early-age cracking. The record offers specified stories at the motives of deformation and cracking, try out equipment for assessing shrinkage and thermal deformation houses, and mitigation options for decreasing early-age cracking.

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For concretes for pavement applications, higher early-age flexural strength is desirable to get traffic on the road with minimal delay. 433 and internal curing at a level of 100 lb/yd3 (59 kg/m3) saturated lightweight aggregate replacement for natural sand have indicated that 74% of the 28-day flexural strength was achieved in 3 days, which is an improvement of 7% over the control mixture. The 3-day flexural strength of the internally cured mixture was 15% greater than that of the control. At 28 days, the flexural strength of the mixture with internal curing exceeded that of the control mixture by 8% (Roberts 2005).

1 How SRAs work—Concrete is generally observed to shrink (that is, reduce its volume) in response to the loss of water that is held in the pore space of the concrete. This loss of water results in the development of a meniscus and capillary pressure in pores. The radius of the meniscus (approximately the radius of the pore being emptied) may be directly related to the extent of capillary pressure that is formed using the Young-Laplace equation (Eq. (5-1)) 2γ ⋅ cos θ σ cap = ---------------------r (5-1) where γ in lb/in.

2006a,b). The influences of SRA on the mechanical properties such as strength or stiffness have also been evaluated. Several researchers reported a reduction in strength and stiffness for water-cured specimens. For example, Brooks and Jiang (1994) reported a lower compressive strength (28%), tensile strength (30 to 40%), flexural strength (10 to 15%), and modulus of elasticity (38%) for specimens containing SRA. Cope and Ramey (2001) reported the compressive strength and elastic modulus were reduced by approximately 10%, while the splitting tensile strength was reduced by 8 to 34%.

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