CN108863262B - High-strength quick anchoring agent and preparation method of slurry thereof - Google Patents

High-strength quick anchoring agent and preparation method of slurry thereof Download PDF

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Publication number
CN108863262B
CN108863262B CN201810739147.0A CN201810739147A CN108863262B CN 108863262 B CN108863262 B CN 108863262B CN 201810739147 A CN201810739147 A CN 201810739147A CN 108863262 B CN108863262 B CN 108863262B
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materials
percent
main
anchoring agent
strength
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CN108863262A (en
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杨忠年
刘泉维
黄习习
凌贤长
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Qingdao University of Technology
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Qingdao University of Technology
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    • 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
    • C04B28/14Compositions 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 calcium sulfate 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
    • C04B2111/20Resistance against chemical, physical or biological attack
    • 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
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention provides a high-strength rapid anchoring agent, which comprises a main material and an auxiliary material, wherein the main material comprises the following raw materials in parts by weight: 30-50% of sulphoaluminate cement, 15-25% of early strength portland cement, 25-35% of fine sand, 3-7% of calcium sulfate and 3-7% of calcium carbonate; the auxiliary materials comprise the following raw materials in percentage by weight relative to the main materials: 0.7 to 1.3 percent of magnesium oxide, 0.7 to 1.3 percent of silicon micropowder, 0.7 to 1.3 percent of naphthalene water reducer powder and 0.07 to 0.13 percent of boric acid. The quick anchoring material provided by the invention has the following beneficial effects: (1) the curing time is short, the compressive strength is high, the compressive strength in the chamber within 24 hours can reach 30MPa under the standard curing condition, and the safe, rapid and high-standard construction requirements can be met; (2) the initial setting time of the slurry is controllable, the fluidity is good, and the use is convenient; (3) good volume stability and good corrosion resistance.

Description

High-strength quick anchoring agent and preparation method of slurry thereof
Technical Field
The invention belongs to the technical field of reinforcing materials for building structures, and particularly relates to a high-strength rapid anchoring agent and a preparation method of slurry thereof.
Background
The anchoring agent has wide application in the processing engineering of building structures, and is generally divided into organic anchoring agents and inorganic anchoring agents from the material composition. The organic anchoring agent has the defects of high curing speed, high anchoring strength and large bearing capacity, but has the defects of harsh construction conditions, easy embrittlement, easy aging, high toxicity, high price and the like in an alkaline environment. The inorganic anchoring agent is mainly composed of silicate cement or sulphoaluminate cement compounded with various functional additives, admixtures and inorganic fillers, and has the advantages of fire resistance, no aging, elastic modulus close to that of concrete, wettability operation, relatively low price and the like. However, the inorganic anchoring agent in the current market needs a long curing time, generally 3 to 7 days, and cannot meet the requirement of rapid construction.
Disclosure of Invention
Aiming at the problem that the existing inorganic anchoring agent has long curing time, the invention aims to provide a high-strength rapid anchoring agent, under the standard curing condition, the compressive strength in an inner chamber within 24 hours can reach 30MPa, and the requirement of rapid construction can be met.
A high-strength rapid anchoring agent comprises a main material and an auxiliary material, wherein the main material comprises the following raw materials in parts by weight: 30-50% of sulphoaluminate cement, 15-25% of early strength portland cement, 25-35% of fine sand, 3-7% of calcium sulfate and 3-7% of calcium carbonate; the auxiliary materials comprise the following raw materials in percentage by weight relative to the main materials: 0.7 to 1.3 percent of magnesium oxide, 0.7 to 1.3 percent of silicon micropowder, 0.7 to 1.3 percent of naphthalene water reducer powder and 0.07 to 0.13 percent of boric acid.
Further, the main materials comprise the following raw materials in parts by weight: 40% of sulphoaluminate cement, 20% of Portland cement, 30% of fine sand, 5% of calcium sulfate and 5% of calcium carbonate; the auxiliary materials comprise the following raw materials in percentage by weight relative to the main materials: 1% of magnesium oxide, 1% of silicon micropowder, 1.25% of naphthalene water reducing agent powder and 0.1% of boric acid.
Further, the early strength portland cement is 425R.
The invention also provides a preparation method of the high-strength rapid anchoring agent slurry, which comprises the steps of uniformly stirring the main material and the auxiliary material according to the mixture ratio, and then adding water for stirring, wherein the water addition amount is 24-28% of the mass of the anchoring agent.
The sulphoaluminate cement, the silicate cement and the calcium sulfate react quickly to form the expansive ettringite quickly; the fine sand plays a skeleton role; the magnesium oxide reacts with the silicon micro powder to improve the strength of the material; the naphthalene water reducing agent mainly improves the workability of the anchoring material; boric acid is used to extend the setting time.
The high-strength rapid anchoring material provided by the invention has the following beneficial effects: (1) the curing time is short, the compressive strength is high, the compressive strength in the chamber within 24 hours can reach 30MPa under the standard curing condition, and the safe, rapid and high-standard construction requirements can be met; (2) the initial setting time of the slurry is controllable, the fluidity is good, and the use is convenient; (3) good volume stability and good corrosion resistance.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 24% of the mass of the anchoring agent.
Example 2
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 24% of the mass of the anchoring agent.
Example 3
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 24% of the mass of the anchoring agent.
Example 4
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 28% of the mass of the anchoring agent.
Example 5
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 25% of the mass of the anchoring agent.
Example 6
According to the mixture ratio shown in the table 1, the auxiliary materials and the main materials are weighed, mixed and stirred uniformly, and then water is added for stirring, wherein the water addition amount is 28% of the mass of the anchoring agent.
Table 1 examples 1-6 raw material ratios of high-strength fast anchoring agent
TABLE 2 Properties of the anchoring Agents
Examples 1-6 slurry initial set times: 30-40 min; good fluidity; under the standard curing condition, the compressive strength in the chamber within 24 hours can reach 30MPa, and the compressive strength in 7 days can reach 60 MPa; micro-expansion; the corrosion resistance is good. The above-mentioned properties of the anchoring agent according to the invention are clearly superior to those of the commercially available equivalent products.
The high-strength rapid anchoring agent of the invention has entrusted a detection mechanism to carry out detection, and the detection unit is as follows: qingdao Jian national engineering detection Co., Ltd, report No. 08C-cAWM1800001, sample name: a high-strength quick anchoring agent.
Example 7 practical application of anchoring agent-Anchor rope construction for open cut foundation pit of subway station
Geological conditions of the field area: the fourth system of the field is an invasion rock mass with the thickness of 5.70-8.70 m and the bedrock in the field mainly comprises granite porphyry. In the influence range of the site structure fracture zone, most of the structural rocks formed under the influence of structural extrusion are disclosed, and the matrix rocks around the fracture zone are influenced by the structural rocks to show the characteristics of uneven mineral alteration degree in the horizontal and vertical directions and uneven fracture joint and crack development.
Anchor cable design values: type of anchor cableThe incidence angle is 20 degrees, the total length is 18m, the anchoring section is 8m, the free section is 10m, the prestress locking value is 370kN, and the designed bearing capacity value is 673 kN.
Preparing slurry: an anchoring agent slurry was prepared as in example 3, and the slurry was stirred uniformly and used with stirring.
Grouting: and performing primary grouting on the anchoring section. And (4) adopting a bottom grouting mode, inserting the bottom end of the guide pipe into the bottom of the hole, and pulling out the grouting pipe while grouting. When the cement grout flows out of the orifice, grouting is stopped.
Grouting effect: after grouting is finished for 20 hours, starting a tension test, pressurizing step by step, and pressurizing to the prestress locking value of the anchor cable of 370kN first, wherein the anchoring body is not damaged; on the basis, the pressure is gradually increased to the designed value of 673kN, and the displacement of the anchoring body is not changed. Fully indicates that the effect achieved by the anchoring material can fully meet the design requirement of 673kN within 20 h. The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (4)

1. The high-strength rapid anchoring agent is characterized by comprising main materials and auxiliary materials, wherein the main materials comprise the following raw materials in parts by weight: 30-50% of sulphoaluminate cement, 15-25% of early strength portland cement, 25-35% of fine sand, 3-7% of calcium sulfate and 3-7% of calcium carbonate; the auxiliary materials comprise the following raw materials in percentage by weight relative to the main materials: 0.7 to 1.3 percent of magnesium oxide, 0.7 to 1.3 percent of silicon micropowder, 0.7 to 1.3 percent of naphthalene water reducer powder and 0.07 to 0.13 percent of boric acid.
2. The high-strength rapid anchoring agent according to claim 1, wherein the main material comprises the following raw materials by weight: 40% of sulphoaluminate cement, 20% of Portland cement, 30% of fine sand, 5% of calcium sulfate and 5% of calcium carbonate; the auxiliary materials comprise the following raw materials in percentage by weight relative to the main materials: 1% of magnesium oxide, 1% of silicon micropowder, 1.25% of naphthalene water reducing agent powder and 0.1% of boric acid.
3. The high strength rapid anchoring agent according to claim 1, wherein the early strength portland cement is 425R.
4. A preparation method of high-strength rapid anchoring agent slurry is characterized in that main materials and auxiliary materials are uniformly stirred according to the mixture ratio of claim 1, then water is added for stirring, and the water addition amount is 24-28% of the mass of the anchoring agent.
CN201810739147.0A 2018-07-06 2018-07-06 High-strength quick anchoring agent and preparation method of slurry thereof Active CN108863262B (en)

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CN109723057A (en) * 2018-12-29 2019-05-07 青岛理工大学 Double high pressures, which are stirred, sprays work soil stabilization method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1396138A (en) * 2002-07-11 2003-02-12 武汉武大巨成加固实业有限公司 Fast anchor type inorganic viscose grouting matenial and its preparing process
CN101157537A (en) * 2007-08-02 2008-04-09 铁道科学研究院铁道建筑研究所 Rapid-hardening self-leveling mortar material
CN104944869A (en) * 2014-03-31 2015-09-30 天津天筑建材有限公司 Grouting material for connecting prefabricated assembled concrete component sleeve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140060391A1 (en) * 2012-08-28 2014-03-06 Pkl Corporation Shrinkage-compensating concrete

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1396138A (en) * 2002-07-11 2003-02-12 武汉武大巨成加固实业有限公司 Fast anchor type inorganic viscose grouting matenial and its preparing process
CN101157537A (en) * 2007-08-02 2008-04-09 铁道科学研究院铁道建筑研究所 Rapid-hardening self-leveling mortar material
CN104944869A (en) * 2014-03-31 2015-09-30 天津天筑建材有限公司 Grouting material for connecting prefabricated assembled concrete component sleeve

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