EP2874971A1 - Accélérateurs de prise et de durcissement en poudre pour béton pulvérisé - Google Patents

Accélérateurs de prise et de durcissement en poudre pour béton pulvérisé

Info

Publication number
EP2874971A1
EP2874971A1 EP13744457.6A EP13744457A EP2874971A1 EP 2874971 A1 EP2874971 A1 EP 2874971A1 EP 13744457 A EP13744457 A EP 13744457A EP 2874971 A1 EP2874971 A1 EP 2874971A1
Authority
EP
European Patent Office
Prior art keywords
accelerator
formula
anyone
aluminium sulphate
accelerator according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13744457.6A
Other languages
German (de)
English (en)
Inventor
Cristiano Maltese
Massimo Stefanoni
Carlo Pistolesi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mapei SpA
Original Assignee
Mapei SpA
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 Mapei SpA filed Critical Mapei SpA
Publication of EP2874971A1 publication Critical patent/EP2874971A1/fr
Withdrawn legal-status Critical Current

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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0042—Powdery mixtures
    • 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
    • C04B2103/10—Accelerators; Activators
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite

Definitions

  • the present invention relates to powder accelerators for sprayed concrete or mortars which promote very high mechanical strengths, in particular at the beginning of curing time. Furthermore, they are able to reduce the setting time of the cementitious system, also when used at low dosage.
  • the cement mixture is directly sprayed on the rocky surface, by means of high pressure nozzles, without the necessity of moulds.
  • the cement materials should meet the following requirements: 1) to adhere permanently on the rock walls; 2) to have a low rebound (a phenomenon arising mainly by the high spraying pressure) which causes a large concrete loss; 3) to harden very quickly; 4) to develop high early strengths.
  • Concrete can be sprayed through dry or wet mix method.
  • the former technique requires that cement, sand and powder accelerator should be conveyed by compressed air through a hose; the water needed for hydration is introduced at the spraying nozzle.
  • cement, sand and powder accelerator should be conveyed by compressed air through a hose; the water needed for hydration is introduced at the spraying nozzle.
  • cement, sand and powder accelerator should be conveyed by compressed air through a hose; the water needed for hydration is introduced at the spraying nozzle.
  • For the wet mix process concrete is previously prepared and pumped into a nozzle, where liquid accelerator is added and pneumatically projected onto the substrate.
  • Liquid or powder based accelerating admixtures are usually utilised in order to guarantee an excellent adhesion of the sprayed material to the rock wall and a rapid compressive strength development.
  • the first condition can be evaluated by measuring the capability of the accelerator to reduce the setting time of a cement paste.
  • the second requirement is determined by measuring the mechanical strength development during the first hours of hydration of a cementitious mortar or concrete.
  • alkaline accelerators such as: soda, potash, silicate or alkali metal aluminates. Nevertheless, such accelerators are known to negatively affect the long term mechanical strengths. Moreover, due to their alkaline nature, they are irritating to the skin and particular protective devices are requested for the workers' s safety. Furthermore, alkali metal substances reacting with aggregates, could favour alkali silica reaction (AS ) which impairing the concrete properties. Finally, they release alkaline substances that, by increasing the pH of ground waters, could be dangerous polluting agents. These problems favoured the development "low in alkali” or "alkali-free" accelerators.
  • AS alkali silica reaction
  • New "alkali-free" admixtures consisting of fluoro aluminates and aluminium sulfate are also known in the art (EP 1 167317 Bl). These accelerators can be in the form of powder or water solutions which cause a quick concrete setting, thereby allowing good adhesion to the rock walls. Nevertheless, they inhibit, in particular during the first hours of hydration, an effective mechanical strength development of the sprayed cementitious material.
  • WO 2005040059 describes liquid or powder based accelerators containing fluoro-carboxylates of aluminum, sodium aluminate and manganese sulphate allowing an effective setting time reduction and a proper mechanical strength development of the sprayed material.
  • FR 2031950 discloses the use of aluminium sulphate as setting or hardening accelerator. Nevertheless, it has to be used at high dosages.
  • WO 201 1026825 discloses a process for the preparation of a sprayable hydraulic binder composition containing water, aggregates, hydraulic binder, set accelerator, characterised in that calcium silicate hydrated is added before and/or at the spray nozzle.
  • the main disadvantages of this approach are the following: 1) It is necessary the use of two different admixtures (a hardening accelerator containing calcium silicate hydrated and a flash setting accelerator); high dosages of both admixtures are necessary to get proper mechanical strength developments.
  • the invention concerns accelerating admixtures for hydraulic binders capable to develop high mechanical strength while maintaining an efficient setting time reduction.
  • accelerators for concrete and mortar containing aluminium sulphate have better performances compared to the commercial ones. Accelerator performances are further improved by adding calcium hydrosilicate, amines and/or alkanolamines, in particular diethanolamine, and/or aluminium hydroxide and/or carboxylic acids and/or soluble fluorides.
  • Accelerator performances are further improved by adding calcium hydrosilicate, amines and/or alkanolamines and/or aluminium hydroxide and/or carboxylic acids and/or water soluble fluorides.
  • Aluminium sulphate used according to the invention is a commercial product characterised by an Al 2 O 3 content between 14 and 17%, containing at least 15% by mass of aluminium sulphate (expressed as Al 2 (SO 4 ) 3 ) characterised in that at least 50% of the total mass of aluminium sulphate has particle size lower than 1 mm.
  • the accelerator according to the invention contains at least 15% by mass of aluminium sulphate (expressed as Al 2 (SO 4 ) 3 ) which is characterized by an Al 2 O 3 content between 14 and 17%, and at least 50% of its mass has a particle size lower than 1 mm.
  • Calcium hydrosilicate could arise from precipitation process of soluble salts of calcium in combination with soluble salts of silicate.
  • Another source of calcium hydrosilicate are minerals selected from Wollastonite (wollastonite; xonotlite; nekoite); Tobermorite (clinotobermorite); Jennite (metajennite); Gyrolite.
  • the concentration of calcium hydrosilicate may range from 1 to 85% by mass of the admixture.
  • the accelerator of the invention is a powder and can be easily prepared mixing the components at ambient temperature in order to get a homogeneous mixture.
  • Example 1 All the components of the examples are expressed as per cent by weight.
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • the mechanical strength was measured by a digital force gauge (O faux Fischer Betonà, Sprayed Concrete Guideline, Wien, March 1999) and it was expressed in N.
  • the mechanical strength was measured according to the EN 196/1 and the values were expressed in MPa. The results are shown in Table 4. Table 4. Mechanical strength development
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • the mechanical strength was measured by a digital force gauge (O faux Fischer Betonà, Sprayed Concrete Guideline, Wien, March 1999) and it was expressed in N.
  • the mechanical strength was measured according to the EN 196/1 and the values were expressed in MPa. The results are shown in Table 8.
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • Table 9 are compared the values of setting times of mortars containing a common aluminium sulphate with a concentration of particles lower than 1 mm of 46% respect to Formula 5 according to the invention. Table 9.
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • Table 10 are compared the values of setting times of mortars containing an accelerator containing sodium aluminate respect to Formula 3 according to the invention. Table 10. Compositions and setting times
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • Table 1 1 are compared the values of setting times of mortars containing Aluminium Sulphate 0-2 mm respect to Formula 4 according to the invention.
  • Table 11. Compositions and setting times
  • Table 1 1 clearly indicate that the mortar containing the accelerator according to the invention (Formula 4) is characterised by a lower setting time compared to the one added with common aluminium sulphate (Formula 1).
  • the mortars were prepared according to EN 934/5.
  • the accelerating admixture was added at the end of the mixing cycle and further mixed for 10 seconds.
  • the mechanical strength was measured by a digital force gauge (O faux Fischer Betonà, Sprayed Concrete Guideline, Wien, March 1999) and it was expressed in N.
  • the mechanical strength was measured according to the EN 196/1 and the values were expressed in MPa. The results are shown in Table 12.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

La présente invention concerne des accélérateurs en poudre pour béton ou mortiers pulvérisés, favorisant une très grande résistance mécanique, notamment au début du temps de prise.
EP13744457.6A 2012-07-18 2013-07-11 Accélérateurs de prise et de durcissement en poudre pour béton pulvérisé Withdrawn EP2874971A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT001255A ITMI20121255A1 (it) 2012-07-18 2012-07-18 Additivi acceleranti di presa e indurimento
PCT/EP2013/064701 WO2014012844A1 (fr) 2012-07-18 2013-07-11 Accélérateurs de prise et de durcissement en poudre pour béton pulvérisé

Publications (1)

Publication Number Publication Date
EP2874971A1 true EP2874971A1 (fr) 2015-05-27

Family

ID=46939784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13744457.6A Withdrawn EP2874971A1 (fr) 2012-07-18 2013-07-11 Accélérateurs de prise et de durcissement en poudre pour béton pulvérisé

Country Status (4)

Country Link
EP (1) EP2874971A1 (fr)
JP (1) JP2015522516A (fr)
IT (1) ITMI20121255A1 (fr)
WO (1) WO2014012844A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021024853A1 (fr) * 2019-08-02 2021-02-11 デンカ株式会社 Additif pour ciment et composition hydraulique
JP6902644B1 (ja) * 2020-03-18 2021-07-14 デンカ株式会社 セメント混和剤及び水硬性組成物
JP6972214B2 (ja) * 2020-03-18 2021-11-24 デンカ株式会社 セメント混和剤及び水硬性組成物
JP6972213B2 (ja) * 2020-03-18 2021-11-24 デンカ株式会社 セメント混和剤及び水硬性組成物
JP6675033B1 (ja) * 2019-08-02 2020-04-01 デンカ株式会社 セメント混和剤及び水硬性組成物
JP6902643B1 (ja) * 2020-03-18 2021-07-14 デンカ株式会社 セメント混和剤及び水硬性組成物

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2142647A1 (en) * 1971-06-22 1973-02-02 Grupul Ind Chimie Powdered/granulated aluminium sulphate - by atomising soln in hot/cold burnt gas/air flow

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100276252B1 (ko) * 1998-12-19 2000-12-15 홍상복 분무내화물의 경화제로 사용되는 황산알루미늄의 미분화방법
ATE429410T1 (de) * 2006-07-14 2009-05-15 Constr Res & Tech Gmbh Stabile spritzbetonbeschleunigerdispersion mit hohem aktivstoffgehalt
CN105367025A (zh) * 2009-09-02 2016-03-02 建筑研究和技术有限公司 可喷涂型水硬性粘合剂组合物及使用方法
ITMI20101950A1 (it) * 2010-10-22 2012-04-23 Mapei Spa Additivo attivatore di cemento e accelerante per calcestruzzi proiettati

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2142647A1 (en) * 1971-06-22 1973-02-02 Grupul Ind Chimie Powdered/granulated aluminium sulphate - by atomising soln in hot/cold burnt gas/air flow

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, CHEMICAL ABSTRACTS SERVICE (C A S), US, 24 August 1992 (1992-08-24), XP000375883, ISSN: 0009-2258 *
See also references of WO2014012844A1 *

Also Published As

Publication number Publication date
WO2014012844A1 (fr) 2014-01-23
JP2015522516A (ja) 2015-08-06
ITMI20121255A1 (it) 2014-01-19

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