High-Strength and High- Performance Concrete

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Guidelines for the selection ofmaterials• Using supplementary cementitious materials, such as blastfurnaceslag, fly ash and natural pozzolans, not onlyreduces the production cost of concrete, but also addressesthe slump loss problem.• The optimum substitution level is often determined by theloss in 12- or 24-hour strength that is consideredacceptable, given climatic conditions or the minimumstrength required.• While silica fume is usually not really necessary forcompressive strengths under 70 MPa, most concretemixtures contain it when higher strengths are specified.
Differences Between NSC andHSC• In normal strength concrete, the microcracks formwhen the compressive stress reaches ~ 40% of thestrength. The cracks interconnect when the stressreaches 80-90% of the strength• For HSC, Iravani and MacGregor reportedlinearity of the stress-strain diagram at 65 to 70,75 to 80 and above 85% of the peak load forconcrete with compressive strengths of 65, 95, and105 MPa.
Page 1 and 2: High-Strength and High-Performance
Page 3 and 4: Definitions• ACI defined high-per
Page 5 and 6: Microstructure
Page 7 and 8: Microstructure• The utilization o
Page 9 and 10: Materials -- Aggregate• In high-s
Page 11: Guidelines for the selection ofmate
Page 15 and 16: Mechanical Behavior• Stress-strai
Page 17 and 18: Long-term strength• Iravani and M
Page 19 and 20: Elastic Modulus• for normal weigh
Page 21 and 22: Chemical and Autogeneousshrinkage
Page 23 and 24: Definition of the autogenousshrinka
Page 25 and 26: Concerns with the use of HSC (2)•
Page 27 and 28: Concerns with the use of HSC (4)•
Page 29 and 30: Examples of application• Prof. Zi
Page 31 and 32: Petronas Towers
Page 33 and 34: Advantages of using HSC in thePetro
Page 35 and 36: Construction Stage: Jan.
Page 37 and 38: Construction Stage: March

High-Strength and High- Performance Concrete

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