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High Strength Concrete

About the definition of high strength concrete, it is in a continuous change state because which strength value that can be called high strength cannot be confirmed with the concrete strength used in construction industry constant increase over the years. Compared with today ready mix concrete used in normal construction projects possesses a 28-day specified compressive strength ranging from 20 MPa (3000 psi) to 40 MPa (6000 psi), with most of it between 28 MPa (4000 psi) and 35 MPa (5000 psi), the high strength concrete has a strength significantly beyond it. In construction projects in the world, high strength concrete with a design strength of 131 MPa (19,000 psi) has been used in the two union square building in Seattle used in its steel tube and concrete composite columns. When you design the mixture components in the production of high strength concrete, you may or may not need special materials, but the producer should know the factors affecting compressive strength and know how to vary those factors for best results. The mixture proportions and properties of commercially available high strength concrete are as shown below.

units per m³mixer number
Cement, Type I, Kg564
Silica fume, Kg24478974
Fly ash, Kg5910487
Coarse aggregate SSD (12.5mm crushed limestone), Kg1068
Fine aggregate SSD, Kg647
HRWR Type F, liters11.611.611.2220.1116.446.3
HRWR Type G, liters3.24
Retarder, Type D, Kg1.121.050.971.461.5
Water to cementing materials ratio0.
Fresh concrete properties
Density, Kg/m³245124532433248624592453
Air Content, %
Concrete temp., ℃242418171723
Compressive strength, 100 x 200-mm moist-cured cylinders
3 days, MPa575455725343
7 days, MPa677171927763
28 days, MPa79929011710085
56 days, MPa849495122116
91 days, MPa881059612412092
182 days, MPa9710597128120
426 days, MPa103118100133119
1085 days, MPa115122115150132
Modulus of elasticity in compression, 100 x 200-mm moist-cured cylinders
91 days, GPa50.649.950.156.553.447.9
Drying shrinkage, 75 by 75 x 285-mm prisms
7 days, millionths19312310087137
28 days, millionths400287240203233
90 days, millionths573447383320340
369 days, millionths690577520453467
1075 days, millionths753677603527523

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