WO2022246524A1 - Béton à dosage unique - Google Patents

Béton à dosage unique Download PDF

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Publication number
WO2022246524A1
WO2022246524A1 PCT/BR2021/050231 BR2021050231W WO2022246524A1 WO 2022246524 A1 WO2022246524 A1 WO 2022246524A1 BR 2021050231 W BR2021050231 W BR 2021050231W WO 2022246524 A1 WO2022246524 A1 WO 2022246524A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
present
water
cement
structural
Prior art date
Application number
PCT/BR2021/050231
Other languages
English (en)
Portuguese (pt)
Inventor
Maria Fernanda ALONSO S. DE OLIVEIRA
Janaina ALVES DE MORAIS
Ivan DE SOUZA SILVA
Original Assignee
Votorantim Cimentos S/A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Votorantim Cimentos S/A filed Critical Votorantim Cimentos S/A
Priority to BR112023024152A priority Critical patent/BR112023024152A2/pt
Priority to PCT/BR2021/050231 priority patent/WO2022246524A1/fr
Publication of WO2022246524A1 publication Critical patent/WO2022246524A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/32—Superplasticisers

Definitions

  • the present invention reveals a concrete for application in works in general, especially works aimed at vertical real estate developments.
  • the concrete of the present invention is a line of concrete that, through its technology and characteristics, allows the execution of concreting with greater productivity, with concrete of differentiated performance and greater resistance, allowing the entire structure to be carried out with a single type of concrete ("single trace"). Concrete is supplied through concrete mixer trucks and is known as central dosed concrete (CDC).
  • CDC central dosed concrete
  • the concretes of the present invention are basically composed of a homogeneous mixture of Portland cement, coarse and fine mineral aggregates, with controlled granulometry, water and chemical additives.
  • the concrete mix also known as dosage, is characterized by the proportion of water, sand, cement and gravel needed to make the concrete for the work. Any change to this measurement can result in a dough that has an irregular texture and is difficult to work with.
  • Document PI 0705850-0 discloses a structural concrete with defined trait dry mixed and stored in bags.
  • Document MU 8102012-0 also reveals concrete in bags with a water dispenser which, according to its characteristics, has the principle of generating concrete packed in bags with its previously defined mix, with a view to taking more practice its use and based on a resistant and safe product.
  • Document PI 0010670-4 discloses an additive for use in the preparation of light weight concrete, in which said additive includes a combination of about 40% to 99% of organic polymeric material and from 1% to about 60 % of an air entrainment agent.
  • the additive is particularly suitable for the preparation of lightweight concrete using polystyrene aggregate.
  • the concrete of the present invention solves the existing problem in the state of the art, since the use of a single trace throughout the structure, allows the production of concrete of greater resistance, providing more support and, therefore, increasing safety structural.
  • single mix concrete allows for increased productivity in concreting, which reduces losses for the construction company, impacting productivity costs.
  • This concrete has numerous advantages compared to the state of the art, such as less variability of the concrete produced, greater compatibility of deformations along the structure, simplification of management, increased productivity, optimization of projects, lower consumption of steel, lower consumption of concrete, greater performance of the structure.
  • structures produced with the concrete of the present invention have greater durability, generating a longer useful life in relation to structures produced with conventional concrete;
  • the present invention allows the execution of concreting of greater productivity, with concrete of different performance in relation to the usual concrete.
  • the concrete of the present invention is the first concrete that allows the entire structure to be made with a single type of concrete, thus replacing the numerous traces of concrete used in a structure.
  • the concrete of the present invention is the only material that allows works already designed with different types of concrete, even with different resistances, to be executed with only one concrete.
  • figure 1 presents selected images extracted from example 01, showing the detail of the Shape Plan of the low floor type (2nd to 7th floor );
  • figure 2 shows selected images extracted from example 01, showing the layout of the low floor forms (2nd to 7th floor);
  • figure 3 presents selected images extracted from example 01, showing the detail of the shape plan of the 8th floor;
  • figure 4 shows selected images extracted from example 01, showing the layout plan for the 8th floor
  • figure 5 presents selected images extracted from example 01, showing the detail of the formwork plan of the 9th floor;
  • figure 6 shows selected images extracted from example 01, showing the ground plan of the 9th floor
  • figure 7 presents selected images extracted from example 01, showing the detail of the plan of forms of the high floor (10th to 14th floor);
  • figure 8 shows selected images extracted from example 01, showing the shape plan of the high-type floor (10th to 14th floor).
  • the present invention consists of a homogeneous mixture of Portland cement, coarse aggregates and mineral fines, with controlled granulometry, water and chemical additives.
  • the coarse and fine aggregates are derived from the crushing of limestone rocks and quartz sand deposits, with optimized and controlled granulometry to obtain greater compactness.
  • the chemical additives used are of the type: a) RA2 - high-performance synthetic superplasticizer based on polycarboxylate polymers (PCE), which promotes water reduction in concrete and considerably increases its fluidity, b) AI incorporating air, which adds a controlled amount of stable microbubbles to the concrete, promoting better rheological behavior and c) CH - hydration controller, which controls the hydration of the cement used, allowing better quality in the application of the concrete.
  • PCE polycarboxylate polymers
  • the amount of mixing water used to produce the concrete of the present invention is lower than conventional concrete. This significant reduction provides improvement in concrete quality parameters in the hardened state, such as such as improved mechanical resistance, improved durability, lower porosity, higher modulus of elasticity and lower shrinkage.
  • the low amount of water used allows the reduction of the amount of cement used. Compared to conventional concrete, this reduction in the amount of water results in a decrease of up to 20% in the emission of CCh/m 3 of concrete.
  • the present invention presents a minimum compressive strength at 28 days of age of 40 MPa and 50 MPa, slump class S220 and uses gravel with grading 0 and 1.
  • the properties of the present invention allow replacing concrete of different strengths used in the structure of a building by a single concrete. Also, due to the high fluidity of the present invention, it is possible replace concrete of different slump classes used in the structure of a building by a single concrete.
  • the structure of the analyzed building is composed of slabs supported by beams that transmit the efforts to the pillars, all of these elements being molded in loco in reinforced concrete.
  • the 8th and 9th floors have variations in structure due to changes in the architectural design, as well as transition beams and changes in pillar sections following the variations in the facades.
  • Structural Model 01 is the original model of the structure, with restrictions and compatibility due to other parts of the building as described in the previous item.
  • the specification of the concrete used in this model is as follows:
  • Structural Model 02 is identical to Structural Model 01, except for the concrete specifications, which are described below:
  • Structural Model 03 was based on Structural Model 01, optimizing the thicknesses of the slabs, disregarding the restriction of guide tubes as explained in item 04. Thus, the thicknesses of the slabs of the standard floors were reduced from 14 cm to 12 cm, and the dimensions of the other structural elements were maintained.
  • the concrete specification was kept identical to Structural Model 01; d.
  • Structural Model 04 was based on Structural Model 02, optimizing the thicknesses of the slabs, disregarding the restriction of guide tubes as explained in item 04.
  • the thicknesses of the slabs of the standard floors were reduced from 14 cm to 12 and 11 cm (due to the Modulus of Elasticity of the single-trace concrete adopted), and the dimensions of the other structural elements were maintained.
  • the concrete specification was kept identical to Structural Model 02.
  • Table 03 Floor Type Tall (10th to 14th floor)
  • Model 01 due to the requirement of NBR 6118 - Design of Concrete Structures - Procedure regarding the minimum reinforcement for slabs and beams being linked - among other factors - to the characteristic resistance of concrete to compression, the comparison between Model 01 and Model 02 presents a distortion because the structural elements - especially the slabs - have the same dimensions, but with higher minimum reinforcement values in Model 02 (Single Trace Concrete) due to the higher value of the characteristic compressive strength of concrete.
  • Models 03 and 04 this distortion is smaller because the slabs have different thicknesses as explained in item 05; d.
  • the dimensions of the pillars were not modified in the models due to the initial premise of the study, but the adoption of Concrete with Single Trace can lead to smaller sections with consequent savings in forms, volume of concrete and amount of steel.
  • Table 7 shows the performance of the two concretes analyzed against the axial compression strength test:
  • Table 8 shows the performance of the two concretes analyzed against the modulus of elasticity test:
  • Table 9 shows the performance of the two concretes analyzed against the chloride ion diffusion test: Table 9. Performance of concrete in the chloride ion diffusion test
  • the performance of the Concrete of the present invention is superior to the reference standard concrete, presenting a low diffusivity and, consequently, greater resistance to the penetration of chloride ions.
  • Table 10 shows the performance of the two concretes analyzed against the capillary water absorption test:
  • Table 11 shows the performance of the two concretes analyzed against the water absorption test by immersion and boiling and void ratio:
  • good quality concrete has a void ratio of less than 15%, and water absorption of less than 5%, and therefore, in this regard, the concrete of the present invention is superior to the standard concrete of reference.
  • Table 12 shows the performance of the two concretes analyzed against the penetration test of water under pressure:
  • the concrete of the present invention presented better indices of durability properties: a. ionic diffusion index (diffusivity): 51.2% of the reference standard concrete; B. capillary absorption index (absorbed volume): 77.6% of the reference standard concrete; ç. Capillary rise (capillary height): 91.7% of reference standard concrete; d. Water absorption (volume): 75.2% of reference standard concrete, and e. void index (porosity): 75.1% of the reference standard concrete.
  • VUP (ABNT NBR 15575), which corresponds to the reference useful life RSL of ISO 15686.
  • the results of the replacement analyzes of standard CAA II class concretes by the concretes of the present invention for service life prediction were obtained through the models TUUTTI (1982), BOB and BOB (1991), MORINAGA (1990) and is presented in the following examples.
  • Example 3 Calculation of Project Useful Life, VUP, according to TUUTTI
  • Concrete of the present invention presented an average coefficient of durability indexes 25.8% higher than that of the reference concrete. In other words, it would correspond to reducing the global coefficient of deterioration and aging due to the risk of depassivation of steel by carbonation to 74.2% in relation to the reference concrete that meets the 50-year VUP.
  • K represent the environmental conditions (in this study, same environment)
  • d represent the C02 concentration on the concrete surface (in this study, the same environment)
  • T ambient temperature (°C); (in this study the same)
  • t time (days).
  • VUP design lifetime
  • the concrete of the present invention presented a VUP design lifetime, or RSL reference lifetime, superior to the reference standard concrete, thus being more durable and stronger than required and prescribed by ABNT NBR 6118 and ABNT NBR 12655 for the condition of exposure and aggressiveness class CAA II.

Abstract

La présente invention concerne un béton qui présente un dosage unique et comprend un mélange homogène de ciment Portland, de aggrégats grossiers et de minerais fins avec une granulométrie régulée, d'eau et d'additifs chimiques. Le béton présente aussi une quantité d'eau de malaxage très inférieure à celle des bétons traditionnels.
PCT/BR2021/050231 2021-05-28 2021-05-28 Béton à dosage unique WO2022246524A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR112023024152A BR112023024152A2 (pt) 2021-05-28 2021-05-28 Concreto com traço único
PCT/BR2021/050231 WO2022246524A1 (fr) 2021-05-28 2021-05-28 Béton à dosage unique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BR2021/050231 WO2022246524A1 (fr) 2021-05-28 2021-05-28 Béton à dosage unique

Publications (1)

Publication Number Publication Date
WO2022246524A1 true WO2022246524A1 (fr) 2022-12-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2021/050231 WO2022246524A1 (fr) 2021-05-28 2021-05-28 Béton à dosage unique

Country Status (2)

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BR (1) BR112023024152A2 (fr)
WO (1) WO2022246524A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208535A1 (fr) * 1985-07-12 1987-01-14 SHIMIZU CONSTRUCTION Co. LTD. Procédé pour la productiond'un béton fludifié
US5181961A (en) * 1989-05-22 1993-01-26 Nihon Cement Co., Ltd. Cement composition
EP0990629A1 (fr) * 1998-04-17 2000-04-05 New Tokyo International Airport Authority Beton de jointement et procede de jointement faisant appel a ce beton
GB2377930B (en) * 2001-06-08 2004-03-10 Rmc Readymix Ltd A cementitious composition

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208535A1 (fr) * 1985-07-12 1987-01-14 SHIMIZU CONSTRUCTION Co. LTD. Procédé pour la productiond'un béton fludifié
US5181961A (en) * 1989-05-22 1993-01-26 Nihon Cement Co., Ltd. Cement composition
EP0990629A1 (fr) * 1998-04-17 2000-04-05 New Tokyo International Airport Authority Beton de jointement et procede de jointement faisant appel a ce beton
GB2377930B (en) * 2001-06-08 2004-03-10 Rmc Readymix Ltd A cementitious composition

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
BASTOS, A. R O.: "ANALISE DA INFLUENCIA DE ADITIVOS SUPERPLASTIFICANTES NO COMPORTAMENTO DE PASTAS DE CIMENTO PORTLAND COM E SEM ADIQAO DE FILER CALCARIO", TRABALHO DE CONCLUSAO DE CURSO, DEPARTAMENTO DE ENGENHARIA CIVIL, UFRGS, 2016 *
CORREA A. C., ET AL.: "AUGUSTO CESAR ABDUCHE CORRÊA ESTUDO DO DESEMPENHO DOS ADITIVOS PLASTIFICANTES E POLIFUNCIONAIS EM CONCRETOS DE CIMENTO PORTLAND TIPO CPIII-40", MASTER DISSERTATION, CIVIL ENGINEERING GRADUATE PROGRAM, UFF, 1 January 2010 (2010-01-01), XP093011075, [retrieved on 20230102] *
ELAINE CRISTINA ZUQUETTI, ESTHER FERREIRA DE AMORIM, ISABELA ALDA ALVES, JÉSSICA LORRANY FERNANDES DE BORGES, LAURA RODRIGUES BERN: "Aditivos e Adições no Concreto = [Additives and Additions in Concrete]", GLOBAL SCIENCE AND TECHNOLOGY, vol. 13, no. 1, 10 June 2020 (2020-06-10), Rio Verde, BR, pages 88 - 102, XP009541691, ISSN: 1984-3801 *
MARTINS V C: "OTIMIZAÇÃO DOS PROCESSOS DE DOSAGEM E PROPORCIONAMENTO DO CONCRETO DOSADO EM CENTRAL COM A UTILIZAÇÃO DE ADITIVOS: ESTUDO DE CASO VANESSA DA COSTA MARTINS", UNIVERSIDADE FEDERAL DE SANTA CATARINA -UFSC PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA CIVIL -PPGEC, 1 January 2005 (2005-01-01), XP093011084, Retrieved from the Internet <URL:https://repositorio.ufsc.br/bitstream/handle/123456789/101966/211524.pdf?sequence=1&isAllowed=y> [retrieved on 20230102] *
NETO A M: "ESTUDO DA INFLUENCIA DE ADITIVOS EM CONCRETO", TRABALHO DE CONCLUSAO DE CURSO, 1 January 2018 (2018-01-01), XP093011081, Retrieved from the Internet <URL:http://186.251.225.226:8080/bitstream/handle/123456789/149/Nardy%20Neto,%20Arnaldo%20Martin%202018.pdf?sequence=1&isAllowed=y> [retrieved on 20230102] *

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