CN110698151A - Prefabricated construction steel bar sleeve grouting material - Google Patents

Prefabricated construction steel bar sleeve grouting material Download PDF

Info

Publication number
CN110698151A
CN110698151A CN201911158930.9A CN201911158930A CN110698151A CN 110698151 A CN110698151 A CN 110698151A CN 201911158930 A CN201911158930 A CN 201911158930A CN 110698151 A CN110698151 A CN 110698151A
Authority
CN
China
Prior art keywords
steel bar
percent
cement
bar sleeve
equal
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.)
Pending
Application number
CN201911158930.9A
Other languages
Chinese (zh)
Inventor
席亚杰
易磊
陈鸿杰
涂巍巍
万国慧
朱杰
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.)
Nantong Modern Construction Industry Development Co Ltd
Original Assignee
Nantong Modern Construction Industry Development Co Ltd
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 Nantong Modern Construction Industry Development Co Ltd filed Critical Nantong Modern Construction Industry Development Co Ltd
Priority to CN201911158930.9A priority Critical patent/CN110698151A/en
Publication of CN110698151A publication Critical patent/CN110698151A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70Grouts, e.g. injection mixtures for cables for prestressed concrete

Abstract

The application discloses assembled construction steel bar sleeve grouting material is formed by mixing the following components in percentage by mass: 40-50% of cement, 45-55% of fine aggregate, 4-6% of silica powder, 0.5-2.0% of alpha semi-hydrated gypsum, 0.5-1.5% of expanding agent, 0.5-1.0% of thickening powder, 0.1-0.5% of tackifier, 0.1-0.2% of water reducing agent, 0.05-0.15% of defoaming agent and 0.05-0.25% of retarder. The construction can be carried out after water is added and stirred according to the water-material ratio of 0.10-0.15, the prepared grouting material has no secret water, the 1d strength is more than or equal to 50MPa, and the 28d strength is more than or equal to 90 MPa; the initial fluidity is more than or equal to 360mm, and the fluidity is more than or equal to 300mm in 30 min; simultaneously, the expansion requirement is met, and no shrinkage exists in the later period; the steel bar is not corroded, so that the steel bar and the steel bar as well as the steel bar and the sleeve can be firmly connected; the stability is good; the cost is low.

Description

Prefabricated construction steel bar sleeve grouting material
Technical Field
The invention relates to the technical field of building engineering materials, in particular to a grouting material for connecting an assembly type building reinforcing steel bar sleeve.
Background
In recent years, the building industrialization of China develops rapidly, the prefabricated concrete structure building has the advantages in urban residential construction, the prefabricated building has the characteristics of environmental protection in construction, short construction period, labor reduction, building quality improvement and the like, the stress steel bar connection technology of the prefabricated part is the key for directly influencing the safety of the prefabricated concrete structure, the integrity, the shock resistance and other performances of the prefabricated structure are greatly influenced, and the principle of the grouting connection technology is as follows: after the connecting reinforcing steel bar is inserted into the sleeve, special grouting material is grouted into the sleeve to fill the gap between the sleeve and the reinforcing steel bar, the grouting material is hardened and then tightly meshed with the transverse rib of the reinforcing steel bar and the inner wall of the sleeve, force is effectively transferred between the reinforcing steel bar and the sleeve, and the two reinforcing steel bars are connected together. The performance advantage of the grouting material plays an important role in ensuring the safety of the steel bar sleeve connection technology.
Along with the rapid development of the fabricated building, the demand of grouting materials is increased day by day, the grouting materials on the market at present are various in types and uneven in quality, and mainly show that the flowability of fresh slurry is poor, the volume shrinkage is large, microcracks are easy to generate, so that the support seat plate in the sleeve and the grouting materials are not tightly attached, the strength development is slow, the durability is poor, and the actual requirements of engineering cannot be met; therefore, how to improve the performance of the grouting material to obtain better effects in the aspects of strength, groutability, expansibility, durability, economy and the like is not only necessary to perfect the grouting technology of the steel sleeve, but also important to promote the development of the fabricated concrete structure.
Disclosure of Invention
The invention aims to provide a high-performance grouting material which has high flow state, no secret water, high strength and early strength, micro expansion, no shrinkage in the later period, no corrosion to reinforcing steel bars, firm connection between the reinforcing steel bars and the reinforcing steel bars, and good economical efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
the assembly type construction steel bar sleeve grouting material is formed by mixing the following components in percentage by mass:
cement: 40 to 50 percent
Fine aggregate: 45 to 55 percent
Silicon micropowder: 4 to 6 percent
Alpha hemihydrate gypsum: 0.5 to 2.0 percent
Swelling agent: 0.5 to 1.5 percent
Thickening powder: 0.5 to 1.0 percent
Tackifier: 0.1 to 0.5 percent
Water reducing agent: 0.1 to 0.2 percent
Defoaming agent: 0.05 to 0.15 percent
Retarder: 0.05 to 0.25 percent.
The cement is compounded by mixing Portland cement and high-alumina cement, the content of the high-alumina cement is 5% -15% of the total mass of the cement, wherein the strength grade of the Portland cement is 52.5Mpa or 62.5Mpa, and the strength grade of the high-alumina cement is 52.5 Mpa.
The fine aggregate is 20-100 mesh graded sand, and the mud content is less than or equal to 1%.
The alpha semi-hydrated gypsum has a compact crystal structure, the balance of a 0.2mm square-hole sieve is less than or equal to 10 percent, the mechanical strength performance of the ultra-early grouting material can be effectively improved, the hydration speed is increased, the expansibility is good, and the structure is compact.
The content of SiO2 in the silicon micropowder is more than or equal to 90 percent, the particle size is less than or equal to 1 mu m, and the specific surface area is 22000-25000 m2The physical properties of the silica fume determine that the tiny particles of the silica fume have high dispersibility, and can be fully filled among cement particles, so that the compactness of the hardened slurry is improved; meanwhile, the silicon micropowder has higher pozzolan activity, can quickly react with calcium hydroxide serving as a cement hydration product to generate calcium silicate hydrate gel (C-S-H), and improves the strength of concrete and the performance of the concrete.
The expanding agent is HCSA calcium oxide double-expansion-source expanding agent, and the specific surface area is more than or equal to 200m2The initial setting time is more than or equal to 45min, the final setting time is less than or equal to 600min, the 7d limited expansion in water is more than or equal to 0.10%, and the 21d limited expansion in air is more than or equal to-0.01%.
The particle size of the thickening powder is less than or equal to 5 mu m, and the specific surface area is 800-1000 m2Kg, the thickening powder has good workability, reinforcement and other effects, can improve various physical and mechanical properties and durability of the mortar, and greatly improveThe operation hand feeling is improved, the bonding strength is improved, and the mortar cost is effectively reduced.
The viscosity of the thickening agent is 300-800 mPa.s, and the cellulose ether can well improve the water retention of the mortar and can improve the consistency and tensile bonding strength of the mortar.
The water reducing agent is a polycarboxylic acid early strength powder water reducing agent, the water reducing rate is more than or equal to 25%, and the retarder is tartaric acid.
The application method of the prefabricated construction steel bar sleeve grouting material comprises the steps of stirring by using a mortar stirrer during construction, adding water according to the water-material ratio of 0.10-0.15, stirring for 5-10 min, and then using the grouting material for construction.
Due to the adoption of the technical scheme, the invention has the following characteristics:
1. the grouting material of the invention is composed of cement (formed by compounding Portland cement and high-alumina cement), fine aggregate, alpha semi-hydrated gypsum, silicon micropowder, expanding agent, thickening powder, tackifier, water reducing agent, defoaming agent and retarder; the problems that the flowability of fresh slurry is poor, the volume shrinkage is large, microcracks are easily generated, the support seat plate in the sleeve is not tightly attached to the grouting material, the strength development is slow, the durability is poor and the like are solved, the requirements of a steel bar sleeve grouting technology can be met, and the method has positive and important significance for assembly type building construction.
2. The invention completely meets the requirements of 'sleeve grouting material for connecting steel bars' JG/T408-2013 standard, the initial fluidity is more than or equal to 360mm, and the fluidity of slurry is more than or equal to 300mm in 30 min; the 1d compressive strength is more than or equal to 50MPa, and the 28d compressive strength is more than or equal to 90 MPa; the vertical expansion rate of 3h is more than or equal to 0.04 percent, the difference value between the expansion rates of 24h and 3h is 0.02 to 0.5 percent, and the sleeve has no corrosion effect on the reinforcing steel bars, so that the reinforcing steel bars and the reinforcing steel bars, and the reinforcing steel bars and the sleeve can be firmly connected.
3. The assembly type construction steel bar grouting material can be constructed after water is added and stirred according to the water-material ratio of 0.10-0.15 when in use, and a factory prefabrication technology is adopted, so that the material mixing is uniform, the stability and reliability of the product quality are ensured, and the construction is convenient, rapid and flexible.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
The prefabricated building steel bar sleeve grouting material in the embodiment is prepared by adopting a factory prefabrication technology; the cement is prepared from the following raw materials in a double-shaft gravity-free stirrer, wherein the raw materials comprise the following cement in percentage by mass: fine aggregate: silicon micropowder: alpha hemihydrate gypsum: swelling agent: thickening powder: tackifier: water reducing agent: defoaming agent: 42 percent of retarder (52.5MPa portland cement accounts for 92 percent of the total cement mass, and 52.5MPa high alumina cement accounts for 8 percent of the total cement mass): 53: 5: 1.0: 1.0: 0.8: 0.2: 0.12: 0.10: 0.13;
during construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.12 for stirring, and the stirring time is 5-10 min, so that the mortar can be used for construction.
Example 2
The prefabricated building steel bar sleeve grouting material in the embodiment is prepared by adopting a factory prefabrication technology; the cement is prepared from the following raw materials in a double-shaft gravity-free stirrer, wherein the raw materials comprise the following cement in percentage by mass: fine aggregate: silicon micropowder: alpha hemihydrate gypsum: swelling agent: thickening powder: tackifier: water reducing agent: defoaming agent: 44 percent of retarder (52.5MPa portland cement accounts for 90 percent of the total cement mass, and 52.5MPa high alumina cement accounts for 10 percent of the total cement mass): 52: 4: 1.1: 0.9: 0.7: 0.3: 0.14: 0.14: 0.15;
during construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.13 for stirring, and the stirring time is 5-10 min, so that the mortar can be used for construction.
Example 3
The prefabricated building steel bar sleeve grouting material in the embodiment is prepared by adopting a factory prefabrication technology; the cement is prepared from the following raw materials in a double-shaft gravity-free stirrer, wherein the raw materials comprise the following cement in percentage by mass: fine aggregate: silicon micropowder: alpha hemihydrate gypsum: swelling agent: thickening powder: tackifier: water reducing agent: defoaming agent: 46 percent of retarder (62.5MPa of Portland cement accounts for 88 percent of the total cement mass, and 52.5MPa of high-alumina cement accounts for 13 percent of the total cement mass): 51: 3: 1.2: 0.8: 0.8: 0.2: 0.16: 0.12: 0.17;
during construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.14, stirring is carried out for 5-10 min, and the mortar can be used for construction.
Example 4
The prefabricated building steel bar sleeve grouting material in the embodiment is prepared by adopting a factory prefabrication technology; the cement is prepared from the following raw materials in a double-shaft gravity-free stirrer, wherein the raw materials comprise the following cement in percentage by mass: fine aggregate: silicon micropowder: alpha hemihydrate gypsum: swelling agent: thickening powder: tackifier: water reducing agent: defoaming agent: the retarder is 48 (the Portland cement with 52 MPa5 accounts for 92% of the total cement mass, and the high-alumina cement with 52.5MPa accounts for 8% of the total cement mass): 50: 2: 0.9: 1.1: 0.7: 0.3: 0.14: 0.13: 0.18 of;
during construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.13 for stirring, and the stirring time is 5-10 min, so that the mortar can be used for construction.
Example 5
The prefabricated building steel bar sleeve grouting material in the embodiment is prepared by adopting a factory prefabrication technology; the cement is prepared from the following raw materials in a double-shaft gravity-free stirrer, wherein the raw materials comprise the following cement in percentage by mass: fine aggregate: silicon micropowder: alpha hemihydrate gypsum: swelling agent: thickening powder: tackifier: water reducing agent: defoaming agent: 45% of retarder (52.5MPa portland cement accounts for 90% of the total cement mass, and 52.5MPa high alumina cement accounts for 10% of the total cement mass): 50: 5: 0.8: 1.2: 0.9: 0.1: 0.12: 0.15: 0.16;
during construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.12 for stirring, and the stirring time is 5-10 min, so that the mortar can be used for construction.
The performance index detection is carried out on the sleeve grouting material prepared in each embodiment, and the detection results of each performance index are shown in the following table;
the table shows that all performance indexes of the grouting material for the assembled building steel bar sleeve exceed the standard value, and the grouting material is high-performance grouting material which has high flow state, no secret water, high strength and early strength, micro expansion, no shrinkage in the later period, no corrosion to the steel bar and capability of firmly connecting the steel bar and the steel bar as well as the steel bar and the sleeve.
The present embodiments are to be considered as illustrative and not restrictive, and the scope of the patent is to be determined by the appended claims.

Claims (7)

1. The prefabricated building steel bar sleeve grouting material is characterized by being formed by mixing the following components in percentage by mass:
cement: 40 to 50 percent
Fine aggregate: 45 to 55 percent
Silicon micropowder: 4 to 6 percent
Alpha hemihydrate gypsum: 0.5 to 2.0 percent
Swelling agent: 0.5 to 1.5 percent
Thickening powder: 0.5 to 1.0 percent
Tackifier: 0.1 to 0.5 percent
Water reducing agent: 0.1 to 0.2 percent
Defoaming agent: 0.05 to 0.15 percent
Retarder: 0.05 to 0.25 percent.
2. The assembly type construction steel bar sleeve grouting material of claim 1, wherein the cement is a compound cement formed by mixing portland cement and high-alumina cement, the content of the high-alumina cement is 5% -15% of the total mass of the cement, the strength grade of the portland cement is 52.5MPa or 62.5MPa, and the strength grade of the high-alumina cement is 52.5 MPa.
3. The assembly type construction steel bar sleeve grouting material of claim 1, wherein the fine aggregate is 20-100 mesh graded sand, and the mud content of the sand is less than or equal to 1%.
4. The assembly type construction steel bar sleeve grouting material of claim 1, wherein the content of SiO2 in the silica micropowder is more than or equal to 90%, the particle size is less than or equal to 1 μm, and the specific surface area is 22000-25000 m2/kg。
5. The assembly type construction steel bar sleeve grouting material of claim 1, wherein the particle size of the thickening powder is less than or equal to 5 μm, and the specific surface area is 800-1000 m2/kg。
6. The fabricated construction steel bar sleeve grout material as claimed in claim 1, wherein the tackifier is cellulose ether and the viscosity is 300-800 mPa-s.
7. The application method of the assembly type construction steel bar sleeve grouting material according to claim 1, wherein the assembly type construction steel bar sleeve grouting material is constructed by adding water and stirring according to a water-material ratio of 0.10-0.15.
CN201911158930.9A 2019-11-22 2019-11-22 Prefabricated construction steel bar sleeve grouting material Pending CN110698151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911158930.9A CN110698151A (en) 2019-11-22 2019-11-22 Prefabricated construction steel bar sleeve grouting material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911158930.9A CN110698151A (en) 2019-11-22 2019-11-22 Prefabricated construction steel bar sleeve grouting material

Publications (1)

Publication Number Publication Date
CN110698151A true CN110698151A (en) 2020-01-17

Family

ID=69206723

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911158930.9A Pending CN110698151A (en) 2019-11-22 2019-11-22 Prefabricated construction steel bar sleeve grouting material

Country Status (1)

Country Link
CN (1) CN110698151A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012149429A2 (en) * 2011-04-28 2012-11-01 Kao Wei H Application of high toughness, low viscosity nano-molecular resin for reinforcing pothole patching materials in asphalt and concrete base pavement
CN105693173A (en) * 2016-02-03 2016-06-22 合肥工业大学 Sleeve grouting material for prefabricated buildings
CN106699077A (en) * 2016-12-19 2017-05-24 重庆市建筑科学研究院 Sleeve grouting material for assembly type building steel bar connection
CN108546063A (en) * 2018-04-17 2018-09-18 上海复培新材料技术有限公司 The special dry powder sleeve grouting material of bar connecting and its preparation
CN110467418A (en) * 2019-07-26 2019-11-19 山西大学 Double expansion sources prefabricated concrete structure reinforced bar sleeve grouting materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012149429A2 (en) * 2011-04-28 2012-11-01 Kao Wei H Application of high toughness, low viscosity nano-molecular resin for reinforcing pothole patching materials in asphalt and concrete base pavement
CN105693173A (en) * 2016-02-03 2016-06-22 合肥工业大学 Sleeve grouting material for prefabricated buildings
CN106699077A (en) * 2016-12-19 2017-05-24 重庆市建筑科学研究院 Sleeve grouting material for assembly type building steel bar connection
CN108546063A (en) * 2018-04-17 2018-09-18 上海复培新材料技术有限公司 The special dry powder sleeve grouting material of bar connecting and its preparation
CN110467418A (en) * 2019-07-26 2019-11-19 山西大学 Double expansion sources prefabricated concrete structure reinforced bar sleeve grouting materials

Similar Documents

Publication Publication Date Title
CN103265253B (en) High-performance grouting material for prefabricated building construction, and preparation method thereof
CN106699077B (en) A kind of assembled architecture bar connecting sleeve grouting material
CN106830856A (en) A kind of ungauged regions reinforcing bar sleeve for connection grouting material and preparation method thereof
CN103896527A (en) Lightweight high-strength cement based composite material
CN105272004A (en) Light-weight high-strength cement-based composite material
CN104150836B (en) A kind of track plates sealing off and covering anchorage mortar and preparation method thereof
CN109809775A (en) A kind of self-compaction self-waterproof concrete
CN107572941B (en) Grouting material special for micro-expansion assembly type construction steel bar connecting sleeve and preparation method thereof
CN108083679B (en) Concrete glue reducing agent and preparation method thereof
CN105693173A (en) Sleeve grouting material for prefabricated buildings
CN107793098B (en) High-fluidity rapid repair mortar
CN104557124B (en) Lightweight anti-crack concrete and preparation method thereof
CN111517732A (en) Sleeve grouting material composition for connecting iron tailing sand steel bars and preparation and application thereof
CN108264270B (en) Environment-friendly slurry for paving metal floor tiles
JP5145918B2 (en) Underwater inseparable cement-based filling composition and underwater inseparable cement mortar
CN111620624A (en) Self-compacting concrete and preparation method thereof
CN110655366A (en) Sound insulation mortar and preparation method thereof
CN110698151A (en) Prefabricated construction steel bar sleeve grouting material
CN109279861B (en) Self-compacting composite concrete, preparation method thereof and concrete wall brick
CN108863148B (en) Self-compacting concrete viscosity modifier
CN108191346B (en) Prefabricated building sleeve grouting material
CN110668750A (en) Special high-impermeability compensation shrinkage concrete for urban underground comprehensive pipe gallery and preparation method thereof
CN109665780A (en) A kind of high flowability reinforcing steel bar connecting sleeve tube grouting material and preparation method thereof
CN108439897A (en) Big fibers content height is prepared using microballon and flows GRC materials and preparation method thereof
CN104496354B (en) A kind of cement-based grouting material and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination