For non-professional friends, it may not be very familiar with high-strength concrete . So, what is high-strength concrete? In fact, concrete with strength class C60 and above is generally called high-strength concrete . As a new building material, high-strength concrete is widely used in high-rise building structures, large-span bridge structures and certain special structures because of its superior compressive strength, strong deformation resistance, high density, and low porosity. application.
High-strength concrete advantages
1. The concrete strength grade is from C30 to C60, the compression member saves 30-40% of the concrete; the bending member saves 10-20% of the concrete.
2. High-strength concrete costs more than ordinary concrete, reduces cross-section, reduces the weight, changes the unsightly phenomenon, increases the area of ​​use, and the economic benefits are significant.
3, dense performance, impermeability, frost resistance are better than ordinary concrete. In addition to high-rise and span projects, it is also used in marine and port engineering to increase the service life.
4. The high stiffness of the components improves the deformation performance.
High-strength concrete requirements
1. Using Portland cement with high C3S content and fineness characteristics, the strength grade of the crucible is 0.9-1.5 times, and the dosage must be controlled within the range of 500-700kg/m3.
2. Cube rubble whose strength index is greater than 2.0, such as: granite, diabase, marble and other aggregates.
3. Use clean sand with a fineness modulus of 2.5 to 3.0 and reduce the moisture content.
4. Use clean water with ph>4, water-cement ratio between 0.28 and 0.35.
5. Use NNO, MF and other superplasticizers.
Main measures adopted to increase concrete strength
(1) Use superplasticizers, high-quality aggregates, cement, and admixtures. Such as: high-quality ground fly ash.
(2) Use sulphoaluminate cements of 525,625,725, iron aluminate cements, and corresponding admixtures.
(3) Preparation of alkali-slag high-strength concrete with slag, alkali components and aggregates.
(4) The use of composite superplasticizer, with 525 cement 320kg/m and 425 cement 480kg/m.
High-strength concrete application
1, concrete
High-strength, lightweight, durable (anti-wear, freeze-thaw resistance, impermeability), disaster resistance (earthquake, wind, fire), anti-explosion and so on.
2, high performance concrete
High performance: high strength, high durability, high fluidity and so on. Compressive strength greater than C50 concrete.
High strength concrete specification
CECS 104:99 "Technical Specification for High-strength Concrete Structures" section 1.0.2 clearly states: "C50-C80 concrete prepared by conventional processes using mineral admixture."
Editor's summary: The above is a brief introduction to the common advantages and applications of high-strength concrete. Hopefully, this will help friends who have this need! For more information, please continue to pay attention to our website, follow-up will show more exciting content. You can also purchase your favorite product on Qijia Mall!
High-strength concrete
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