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Concrete mix designs using a plurality of reinforcement fibers systems

a reinforcement fiber and mix technology, applied in the field of concrete formulations, can solve the problems of reducing the scope of application and placement properties, reducing the degree of mechanical resistance that can be achieved, both in terms of compressive strength, flexural strength or ductility

Inactive Publication Date: 2018-05-17
CEMEX RES GRP AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]The present invention proposes a solution to overcome the various drawbacks of WO 2011 / 053103. The concrete mix designs according to the present invention are not limited to shrinkage resistance enhancement using shrinkage reducers and synthetic fibers for this unique goal and true structural properties to be used in structural engineering for decks, bridges, pillars, etc. Also, the fiber reinforced fresh concrete mix designs according to the invention are engineered to comply with industrial production requirements, they are produced in conventional concrete mixing plants, can be transported over large distance since they have a high workability retention and do not need special curing techniques once placed.
[0126]Concrete Concrete is primarily a combination of hydraulic binder, sand, fine and / or coarse aggregates, water. Admixture can also be added to provide specific properties such as flow, lower water content, acceleration . . . .

Problems solved by technology

Amongst others, one important disadvantage of the patent application WO 2011 / 053103 is the requirement to prepare a separate slurry containing water, cement and all shrinkage reducers and plasticizers (or water reducers admixture—namely powdered melamine or phosphonates), or fillers as well as fillers.
A further important drawback of the invention according to WO 2011 / 053103 is the fact that the final placed concrete has to be cured using water after placing.
An additional drawback of the invention according to WO 2011 / 053103 is that the volume of paste is very low to ensure limited shrinkage and avoid cracking, thus reducing the scope of application and placement properties and well as the level of mechanical resistances that can be achieved, both in terms of compressive strength and in terms of flexural strength or ductility.

Method used

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  • Concrete mix designs using a plurality of reinforcement fibers systems
  • Concrete mix designs using a plurality of reinforcement fibers systems
  • Concrete mix designs using a plurality of reinforcement fibers systems

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0145]

MaterialUnitQuantityTotal binder contentkg / m3410CEM I 52.5 Nkg / m3410w / b eff—0.43Admix System I% total binder1.40%contentAdmix System II% total binder0.50%contentSand 0 / 4 roundkg / m3707Gravel 4 / 8 crushedkg / m3443Gravel 8 / 11 crushedkg / m3621Fiber type A1 - l / d = 80-l = 60 mm, YS =% volume0.50%2400, US = 2890 MPa, hookedFiber type A2 - l / d eq. = 50-l = 38 mm,% volume0.25%YS = 800 MPa, US = 870 MPa, Wavyshape, A = 3 mm, F = 2 cm−1Entrained airl / m315Paste volumel / m3321.46Slump class—SF1Slumpmm670Workability retentionmin90fcMPa40fflMPa5.1fr1MPa4.7fr3MPa5.2E modulusGpa31.8

[0146]Example 1 shows a concrete mix design with medium compressive strength and low paste volume according to the invention, with fibers systems A1 and A2, as well as admixture systems I and II.

example 2

[0147]

MaterialUnitQuantityTotal binder contentkg / m3750CEM II / A-LL 52.5 Nkg / m3500Fly ashkg / m3200Silica fumekg / m350w / b eff—0.32Admix System I% total binder2.70%contentAdmix System II% total binder0.30%contentAdmix System III% total binder6.20%contentSand 0 / 4 crushedkg / m3646Gravel 4 / 8 roundkg / m3453Gravel 8 / 10 roundkg / m3194Fiber type A1 - l / d = 80-l = 60 mm, YS =% volume0.75%2400, US = 2890 MPa, hookedFiber type A2 - l / d eq. == 50, l = 38 mm,% volume0.30%YS = 800 MPa, US = 870 MPa, Wavyshape, A = 2.5 mm, F = 4.5 cm−1Entrained airl / m326Paste volumel / m3530.79Slump class—SF2Slumpmm740Workability retentionmin120fcMPa74fflMPa8.5fr1MPa11.8fr3MPa14.7E modulusGpa41.9

[0148]Example 2 shows a concrete mix design according to the invention with high compressive strength and high paste volume, with fibers systems A1 and A2, as well as admixture systems I and II and III.

example 3

[0149]

MaterialUnitQuantityTotal binder contentkg / m3630CEM III / B 52.5Rkg / m3400Fly ashkg / m380Silica fumekg / m350w / b eff—0.35Admix System I% total binder1.80%contentAdmix System II% total binder0.45%contentSand 0 / 4 roundkg / m3721Gravel 4 / 8 Crushedkg / m3289Gravel 8 / 11 crushedkg / m3434Fiber type A1 - l / d = 40-l =% volume0.75%100 mm, YS = 1850MPa, US = 1920 MPa, straightEntrained airl / m338Paste volumel / m3441.54Slump class—S5Slumpmm240Workability retentionmin105fcMPa65fflMPa6.7fr1MPa2.1fr3MPa2.5E modulusGpa37.5

[0150]Example 3 shows a concrete mix design with high compressive strength medium to high paste and high binder content, using fibers system A1 only (without fiber system A2 or fiber system B). The concrete mix design of example 3 is not according to the invention since it does not contain fibers system B and does meet the requirements related to the ductility values to be achieved.

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Abstract

A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-80 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

Description

FIELD OF THE INVENTION[0001]The present invention relates to concrete formulations for high mechanical performances in structural designs, fiber reinforcement special mix designs to limit or avoid steel rebars or pre-stressing. More specifically, the invention discloses concrete mix designs with high volumetric content of fibers and that the concrete contains different types of fibers to form a so-called hybrid fiber system.BACKGROUND OF THE INVENTION[0002]Conventional fiber reinforced concrete technology is known, it has been described in various National and International Norms e.g. RILEM 162 TDF International), Model Code 2010 (International), CNR DT 204 (Italy SS 812310 (Sweden), TR63 (UK) ACI 318 (USA) ACI 360 (USA), DBV (Germany), DAFSTB (Austria). Fiber reinforced concrete mix designs containing different types of fibers have been for examples disclosed for example in WO 2011 / 053103 and more recently in CN102976697 and KR100940550. Such concrete are mainly used for pavement o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50Y02W30/91C04B14/062C04B14/42C04B14/48C04B16/0683C04B24/2664C04B24/38C04B24/383C04B14/06C04B14/4668C04B18/08C04B18/146C04B14/04C04B14/38C04B16/0625C04B16/0633C04B16/0691C04B2111/34
Inventor ESSER, JEREMYZAMPINI, DAVIDEGUERINI, ALEXANDREVOLPATTI, GIOVANNI
Owner CEMEX RES GRP AG
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