CN113321471B - Crack-resistant self-induction sleeve grouting material and preparation method thereof - Google Patents

Crack-resistant self-induction sleeve grouting material and preparation method thereof Download PDF

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CN113321471B
CN113321471B CN202110658709.0A CN202110658709A CN113321471B CN 113321471 B CN113321471 B CN 113321471B CN 202110658709 A CN202110658709 A CN 202110658709A CN 113321471 B CN113321471 B CN 113321471B
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parts
grouting material
sleeve grouting
crack
water
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CN113321471A (en
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李玉博
雷五宜
苏英
贺行洋
方娇林
张路川
张权钢
程璐
杨启凡
王迎斌
杨进
王传辉
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Hubei University of Technology
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    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials
    • 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
    • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
    • 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
    • C04B2111/90—Electrical properties
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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

Abstract

The invention provides a crack-resistant self-induction sleeve grouting material and a preparation method thereof, and the grouting material is characterized by comprising the following components in parts by mass: 600-900 parts of portland cement, 200-360 parts of composite slurry, 4-6 parts of steel fibers, 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 780-1170 parts of quartz sand, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 50-60 parts of water. The grouting material provided by the invention improves the crack resistance and toughness of the grouting material, and the durability of the material is improved; the intelligent nondestructive detection is realized through the pressure sensitivity of the material, the safety is also ensured, accurate data reference is provided for the sleeve filling material in the construction detection, and the intelligent detection is really realized.

Description

Crack-resistant self-induction sleeve grouting material and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a crack-resistant self-induction sleeve grouting material and a preparation method thereof.
Background
According to the statistical situation of the development of the fabricated building collected and summarized from various reports in the ' notice of standard quota of housing and urban and rural construction department about the statistical work of the development of the fabricated building in 2020 ' (the content of the construction department ' 2020/191), the related industries of the fabricated building develop rapidly along with the enhancement of policy drive and the endogenous power in the market.
By 2020, 328 national assembly type building industry bases and 908 provincial industry bases are created in the whole country. In the assembly type building industry chain, the production and the assembly decoration of components become new bright points. Wherein, the production capacity and the capacity utilization rate of the components are further improved, and the annual assembly decoration area is increased by 58.7 percent compared with 2019.
With the rapid development of assembly type buildings, sleeve grouting is generally adopted to connect prefabricated components. However, the key of the connection mode lies in the performance of the grouting material, and at present, the sleeve grouting material is researched a lot at home and abroad, but the problems that the tensile strength is low, the crack resistance is poor, the toughness is low and the like are generally existed, the accurate detection is difficult to be carried out during the construction or later-stage completion, and the safety and the durability can not be ensured exist.
For example, patent document CN 105067164B provides a conductive cement-based composite material and a method for preparing the same. The CNT (carbon nano tube) is primarily dispersed by the nano carbon black, the nano carbon black can be filled in micro gaps between adjacent carbon nano tubes, and the unique grape string-shaped structure can promote the dispersion of the nano carbon material in a cement matrix; meanwhile, filamentous carbon nanotubes can play a role of conductive bridging paths in a cement matrix, and the carbon blacks can form chain-shaped conductive paths, but the CNT structure is damaged. In this document, only the problems of dispersion and conductivity of CNTs are considered, and only the conductivity of CNTs is used for detection, and other materials do not have good conductivity; the nano carbon black can cause the CNT to be temporarily dispersed in the material by destroying the CNT structure, but the CNT can be reunited at the later stage, the resistance is greatly changed, the influence on the later detection data is large, and the detection cannot be accurately carried out.
Patent document CN204461579U provides a vehicle overload monitoring device based on conductive concrete self-induction capability, in which two reinforcing steel bar nets are embedded as electrodes at upper and lower positions of a part in a self-induction concrete pavement slab, and a connector lug is arranged at an end of each reinforcing steel bar net for connecting a circuit, so that a current value inside the conductive concrete pavement slab can be continuously and accurately collected when a vehicle passes through the conductive concrete pavement slab and transmitted to a control device in real time, and the control device converts the current value into vehicle weight information to be displayed on a display screen. In the document, overload, namely pressure, is detected in a way of embedding an electrode and a circuit, the way is troublesome in construction, and the breakage of the electrode and the circuit can be caused under the condition of disturbance after construction is finished, so that a detection device loses effect and cannot perform detection; in a wet environment, corrosion of the electrode can be caused, and the durability is difficult to ensure; over time, the detection error will also become larger.
Therefore, the sleeve grouting material which can be accurately detected and has good safety and durability is developed, and the method has important significance for assembly type buildings.
Disclosure of Invention
In view of the defects of low tensile strength, poor crack resistance, low toughness and the like of the existing sleeve grouting material, difficulty in detecting the existing sleeve grouting material during construction or later-stage completion, incapability of ensuring safety and durability and the like, the invention develops the crack-resistant self-induction sleeve grouting material, which improves the crack resistance and toughness of the grouting material and improves the durability of the material; the intelligent nondestructive detection is realized through the pressure sensitivity of the material, the safety is also ensured, accurate data reference is provided for the sleeve filling material in the construction detection, and the intelligent detection is really realized.
The invention provides a crack-resistant self-induction sleeve grouting material which is characterized by comprising the following components in parts by mass: 600-900 parts of portland cement, 200-360 parts of composite slurry, 4-6 parts of steel fibers, 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 780-1170 parts of quartz sand, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 50-60 parts of water.
Wherein the composite slurry is prepared by the following method, wherein the raw materials are calculated by mass portion,
(1) putting 60-90 parts of steel slag powder, 100-200 parts of water and 1-2 parts of water reducing agent into a ball mill, and grinding for 60-120 min to obtain slurry A with the median particle size of 2-3 mu m;
(2) dissolving the slurry A and 1-2 parts of a water reducing agent into 50 parts of water, adding 0.3-0.5 part of a multi-walled carbon nanotube, magnetically stirring for 5min, and ultrasonically dispersing in a water bath at the frequency of 60-100 kHz and the temperature of 10-20 ℃ for 10-30 min to obtain 212.3-344.5 parts of a suspension B, wherein the suspension B is used as a composite slurry.
The invention also provides a preparation method of the crack-resistant self-induction sleeve grouting material, which is characterized by comprising the following steps of:
(1) placing 600-900 parts of dry portland cement and 200-360 parts of composite slurry in a mortar stirring pot, and stirring at the speed of 135-145 r/min for 1-3 minutes;
(2) adding 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 780-1170 parts of quartz sand, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes; then adding 50-60 parts of water, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes;
(3) after scraping the bowl wall, adding 4-6 parts of steel fiber, and stirring at the speed of 275-295 r/min for 2-5 minutes;
finally obtaining the crack-resistant self-induction sleeve grouting material.
The beneficial technical effects of the invention are as follows:
(1) according to the crack-resistant self-induction sleeve grouting material provided by the invention, the CNT (carbon nano tube) is dispersed fully by wet grinding of the steel slag powder and the water reducing agent in cooperation with ultrasonic dispersion, and the CNT serving as a nano material has a large specific surface area and strong adsorption capacity, is easy to agglomerate due to van der Waals force to form a large number of clusters, so that large pores and cracks in a cement matrix are formed, and a local stress concentration phenomenon occurs in the cement matrix, so that the strength of the cement matrix is reduced; if the carbon nano-tube can be effectively and uniformly dispersed in the matrix, the toughening effects of pinning, debonding, pulling out, net micro-filling and the like of the carbon nano-tube can be fully exerted. The polycarboxylic acid side chain interacts with the CNT aggregate, the main chain faces to a water phase, the arrangement mode of surfactant molecules in the micelle is similar, then the CNT is fully dispersed through the mechanical friction of the steel slag, the CNT is effectively anchored by the hydration product of the steel slag in the cement, and the steel slag is used as a medium, so that the interface action of the CNT and the cement hydration product is enhanced; and the material is mixed with superfine mineral powder and superfine fly ash, so that the strength and the fluidity of the grouting material are mainly improved.
(2) According to the crack-resistant self-induction sleeve grouting material provided by the invention, the steel fibers are doped, so that the bonding force between the steel fibers and a grouting material matrix can block the extension of cracks, and the steel fibers are distributed in a disorder manner in the grouting material, so that the steel fibers distributed in the disorder manner form a net system in the grouting material when being pressed, and a larger bridging constraint effect is achieved in the material, so that the mechanical property of the grouting material is improved. The flexural strength of the steel fibers 1d and 28d is increased by 55.4% and 74.7%, respectively, which shows that the steel fibers can obviously increase the toughness and rigidity of the grouting material.
(3) The crack-resistant self-induction sleeve grouting material provided by the invention has the advantages that the electrical property of the carbon nano tube is good, the carbon nano tube and the steel fiber form a circuit in the material, the electrical signal is stable and regularly changed, the changed electrical signal is analyzed through testing, the stress strain or crack damage of the material can be monitored and sensed, the grouting material is arranged in the sleeve, the durability is good, and the electrical signal is not required to change along with the time. Therefore, based on the conductive characteristic of the carbon nanotube/steel fiber cement-based composite material, the grouting material has self-sensing capability, and intelligent monitoring is really realized.
Detailed Description
The invention provides a crack-resistant self-induction sleeve grouting material which is characterized by comprising the following components in parts by mass: 600-900 parts of portland cement, 200-360 parts of composite slurry, 4-6 parts of steel fibers, 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 780-1170 parts of quartz sand, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 50-60 parts of water.
Wherein the composite slurry is prepared by the following method, and the raw materials are calculated by mass portion,
(1) putting 60-90 parts of steel slag powder, 100-200 parts of water and 1-2 parts of water reducing agent into a vertical stirring ball mill, and grinding for 60-120 min to obtain slurry A with the median particle size of 2-3 mu m;
(2) dissolving the slurry A and 1-2 parts of water reducing agent into 40-60 parts of water, adding 0.3-0.5 part of carbon nano tube, magnetically stirring for 3-7 min, and ultrasonically dispersing in water bath at the frequency of 60-100 kHz and the temperature of 10-20 ℃ for 10-30 min to obtain a suspension B, wherein the suspension B is used as a composite slurry.
The raw materials used in the present invention are all conventional raw materials in the art, and are not particularly limited, and are commercially available as long as the object of the present invention can be achieved, and the raw materials used in the examples of the present invention and comparative examples are also commercially available, and the parameters of these raw materials satisfy the limitations of the respective raw materials in the preferred embodiments described below.
Preferably, the steel slag powder is fine powder with the median particle size of 10-20 microns.
Preferably, the water reducing agent is polycarboxylate water reducing agent powder, and the maximum water reducing rate is 30-40%.
Preferably, the carbon nanotube is a multi-walled carbon nanotube (MWCNT), the average outer diameter is preferably 1.2-2.0 nm, more preferably 1.6 +/-0.4 nm, and the length is more than or equal to 5 microns.
Preferably, the cement is P.II52.5 Portland cement with the specific surface area of more than or equal to 419.7m2Kg, density is more than or equal to 3.14g/cm3。
Preferably, the length of the steel fiber is 1-3 mm, the diameter of the cross section of the steel fiber is less than or equal to 0.12mm, and the length-diameter ratio of the steel fiber is less than or equal to 68.
Preferably, the activity index of the superfine mineral powder is more than or equal to 120 percent, and the median D50 is less than or equal to 4.75 mu m.
Preferably, the superfine fly ash micro-beads have the median particle diameter D50 of less than or equal to 3 μm and the activity index of more than or equal to 120%.
Preferably, the maximum grain diameter of the quartz sand is less than or equal to 2.36mm, and the mud content is less than or equal to 1%.
Preferably, the swelling agent is a plastic swelling agent, (K)2O+Na2The total content of O) is 0.3 to 0.4 percent, the vertical expansion rate of 3 hours can reach 2.5 percent, the vertical expansion rate of 24 hours can reach 2 percent, and the strength loss is less than or equal to 12 percent.
The invention also provides a preparation method of the crack-resistant self-induction sleeve grouting material, which is characterized by comprising the following steps of:
(1) placing 600-900 parts of dry portland cement and 212.3-344.5 parts of composite slurry in a mortar stirring pot, and stirring at the speed of 135-145 r/min for 2 minutes;
(2) adding 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 780-1170 parts of quartz sand, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes; then adding 50-60 parts of water, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes;
(3) after scraping the bowl wall, adding 4-6 parts of steel fiber, and stirring at the speed of 275-295 r/min for 2-5 minutes;
finally obtaining the crack-resistant self-induction sleeve grouting material.
Examples
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be clearly and completely described below by way of examples, but the present invention is not limited to the following examples.
Example 1
The preparation method of the composite slurry in the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) putting 60 parts of steel slag powder, 100 parts of water and 1 part of water reducing agent into a vertical stirred ball mill, and grinding for 60min to obtain slurry A with the median particle size of 3 mu m;
(2) dissolving the slurry A and 1 part of water reducing agent into 50 parts of water, adding 0.3 part of MWCNT, magnetically stirring for 5min, and ultrasonically dispersing in water bath at the frequency of 80kHz and the temperature of 15 ℃ for 10min to obtain 212.3 parts of suspension B, wherein the suspension B is used as composite slurry.
The preparation method of the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) placing 600 parts of dry portland cement and 212.3 parts of composite slurry in a mortar stirring pot, and stirring at a low speed of 140r/min for 2 minutes;
(2) adding 60 parts of superfine mineral powder, 60 parts of superfine fly ash microbeads, 1 part of defoaming agent, 1 part of expanding agent and 780 parts of quartz sand, and mixing and stirring at low speed for 1 minute; then 50 parts of water is added, and the mixture is mixed and stirred for 2 minutes at a low speed of 140 r/min;
(3) scraping the wall of the bowl, adding 4 parts of steel fiber, and stirring for 3 minutes at a medium speed of 285 r/min; and obtaining the crack-resistant self-induction sleeve grouting material.
Example 2
The preparation method of the composite slurry in the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) putting 70 parts of steel slag powder, 150 parts of water and 2 parts of water reducing agent into a vertical stirred ball mill, and grinding for 80min to obtain slurry A with the median particle size of 2.5 mu m;
(2) dissolving the slurry A and 1 part of water reducing agent into 40 parts of water, adding 0.4 part of WMCNT, magnetically stirring for 3min, and ultrasonically dispersing in water bath at the frequency of 60kHz and the temperature of 10 ℃ for 20min to obtain 263.4 parts of suspension B, wherein the suspension B is used as composite slurry.
The preparation method of the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) placing 700 parts of dry portland cement and 263.4 parts of composite slurry in a mortar stirring pot, and stirring at a low speed of 135r/min for 1 minute;
(2) adding 70 parts of superfine mineral powder, 70 parts of superfine fly ash microbeads, 1 part of defoaming agent, 2 parts of expanding agent and 910 parts of quartz sand, and mixing and stirring at low speed for 2 minutes; then 55 parts of water is added, and the mixture is mixed and stirred for 1 minute at a low speed of 135 r/min;
(3) scraping the bowl wall, adding 5 parts of steel fiber, and stirring at a medium speed of 275r/min for 2 minutes; and obtaining the crack-resistant self-induction sleeve grouting material.
Example 3
The preparation method of the composite slurry in the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) putting 80 parts of steel slag powder, 150 parts of water and 2 parts of water reducing agent into a vertical stirred ball mill, and grinding for 100min to obtain slurry A with the median particle size of 2.1 mu m;
(2) dissolving the slurry A and 2 parts of water reducing agent into 60 parts of water, adding 0.5 part of MWCNT, magnetically stirring for 7min, and ultrasonically dispersing in a water bath at the frequency of 100kHz and the temperature of 20 ℃ for 30min to obtain 294.5 parts of suspension B, wherein the suspension B is used as composite slurry.
The preparation method of the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) placing 800 parts of dry portland cement and 294.5 parts of composite slurry in a mortar stirring pot, and stirring at a low speed of 145r/min for 3 minutes;
(2) adding 80 parts of superfine mineral powder, 80 parts of superfine fly ash microspheres, 2 parts of defoaming agent, 3 parts of expanding agent and 1040 parts of quartz sand, and mixing and stirring at low speed for 3 minutes; then 60 parts of water is added, and the mixture is mixed and stirred for 3 minutes at the low speed of 145 r/min;
(3) scraping the bowl wall, adding 6 parts of steel fiber, and stirring at the medium speed of 295r/min for 5 minutes; and obtaining the crack-resistant self-induction sleeve grouting material.
Example 4
The preparation method of the composite slurry in the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) putting 90 parts of steel slag powder, 200 parts of water and 2 parts of water reducing agent into a vertical stirred ball mill, and grinding for 120min to obtain slurry A with the median particle size of 2 mu m;
(2) dissolving the slurry A and 2 parts of water reducing agent into 50 parts of water, adding 0.5 part of MWCNT, magnetically stirring for 5min, and ultrasonically dispersing in water bath at the frequency of 80kHz and the temperature of 15 ℃ for 30min to obtain 344.5 parts of suspension B, wherein the suspension B is used as composite slurry.
The preparation method of the crack-resistant self-induction sleeve grouting material comprises the following steps:
(1) placing 900 parts of dry cement and 344.5 parts of composite slurry in a mortar stirring pot, and stirring at a low speed of 140r/min for 2 minutes;
(2) adding 90 parts of superfine mineral powder, 90 parts of superfine fly ash microbeads, 2 parts of defoaming agent, 3 parts of expanding agent and 1170 parts of quartz sand, and mixing and stirring for 1 minute at low speed; then 60 parts of water is added, and the mixture is mixed and stirred for 2 minutes at a low speed of 140 r/min;
(3) scraping the bowl wall, adding 6 parts of steel fiber, and stirring at a medium speed of 280r/min for 3 minutes; and obtaining the crack-resistant self-induction sleeve grouting material.
Comparative example 1
And (3) common grouting materials:
Figure BDA0003114397060000091
according to the components, the Portland cement, the slag, the water reducing agent, the defoaming agent and the expanding agent are weighed according to the parts by weight, the river sand is added and stirred uniformly, the water is added, and the stirring is carried out by using a mortar stirring method to prepare the conventional common grouting material.
The only difference between the comparative example 1 and the example is that the comparative example 1 is the existing common grouting material, the median particle size of the slag is 5.3-14.5 mu m, and the particle size of the river sand is 0.15-4.75 mm.
The following performance tests were performed on the grouting materials prepared in examples 1 to 4 and comparative example 1, and the test results are shown in table 1.
The detection method is as follows:
fluidity: and (4) detecting according to the standard of GB/T2419-2005.
Expansion ratio: the test was carried out with reference to the GB/T50123 standard.
Compressive strength and flexural strength: and detecting according to the standard of GB 50204-2015.
Volume resistivity: the resistance was measured with a digital multimeter (Agilent Technologies 34410a) and the volume resistivity was calculated.
TABLE 1
Figure BDA0003114397060000101
As can be seen from Table 1, the crack-resistant self-induction sleeve grouting materials prepared in the embodiments 1-4 of the invention have better fluidity and 3h expansion rate than the grouting material prepared in the comparative example 1.
In addition, regarding the difference between the expansion rate% of 24h and the expansion rate% of 3h and the compressive strength, the crack-resistant self-induction sleeve grouting materials prepared in the embodiments 1 to 4 of the present invention are similar to the grouting material prepared in the comparative example 1, which shows that the grouting material prepared in the present invention also reaches the existing level in the two indexes of the difference between the expansion rate% of 24h and the expansion rate% of 3h and the compressive strength.
In addition, compared with the comparative example 1, the crack-resistant self-induction sleeve grouting material prepared in the embodiments 1 to 4 of the invention has the advantages that the breaking strength and toughness of the grouting material are obviously improved, the extension of a pressed crack can be prevented, and the durability of the material is improved; the volume resistivity is small, the fluctuation during detection is small, the data are stable, the accuracy is high, intelligent nondestructive detection can be realized through the pressure sensitivity of the material, the safety is also ensured, accurate data reference is provided for the detection of the sleeve grouting material, and the method has important significance for the development of the assembly type building.

Claims (9)

1. The crack-resistant self-induction sleeve grouting material is characterized by comprising the following components in parts by mass: 600-900 parts of portland cement, 200-360 parts of composite slurry, 4-6 parts of steel fibers, 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 780-1170 parts of quartz sand, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 50-60 parts of water;
wherein the composite slurry is prepared by the following method, wherein the raw materials are calculated by mass portion,
(1) putting 60-90 parts of steel slag powder, 100-200 parts of water and 1-2 parts of water reducing agent into a ball mill, and grinding for 60-120 min to obtain slurry A with the median particle size of 2-3 mu m; wherein the water reducing agent is polycarboxylate water reducing agent powder;
(2) dissolving the slurry A and 1-2 parts of water reducing agent into 40-60 parts of water, adding 0.3-0.5 part of carbon nano tube, magnetically stirring for 3-7 min, and ultrasonically dispersing in water bath at the frequency of 60-100 kHz and the temperature of 10-20 ℃ for 10-30 min to obtain a suspension B, wherein the suspension B is used as a composite slurry.
2. The sleeve grouting material of claim 1, wherein the steel slag powder has a median particle diameter of D50 ═ 10 to 20 μm;
the maximum water reducing rate of the water reducing agent is 30-40%;
the average outer diameter of the carbon nano tube is 1.2-2.0 nm, and the length of the carbon nano tube is more than or equal to 5 mu m.
3. A sleeve grouting material as claimed in claim 1, characterised in that the specific surface area of the portland cement is 419.7m or more2Kg, density is more than or equal to 3.14g/cm3。
4. The sleeve grouting material as claimed in claim 1, wherein the length of the steel fiber is 1-3 mm, the diameter of the cross section is less than or equal to 0.12mm, and the length-diameter ratio is less than or equal to 68.
5. The sleeve grouting material as claimed in claim 1, wherein the activity index of the ultrafine ore powder is not less than 120%, and the median D50 is not more than 4.75 μm.
6. A sleeve grouting material as claimed in claim 1, wherein the ultrafine fly ash micro-beads have a median particle diameter D50 of 3 μm or less and an activity index of 120% or more.
7. The grouting material for sleeves according to claim 1, wherein the maximum grain size of the quartz sand is less than or equal to 2.36mm, and the mud content is less than or equal to 1%.
8. A sleeve grouting material as claimed in claim 1, characterised in that the swelling agent is a plastic swelling agent.
9. The preparation method of the crack-resistant self-induction sleeve grouting material as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
(1) placing 600-900 parts of dry portland cement and 200-360 parts of composite slurry in a mortar stirring pot, and stirring at the speed of 135-145 r/min for 1-3 minutes;
(2) adding 60-90 parts of superfine mineral powder, 60-90 parts of superfine fly ash microbeads, 1-2 parts of defoaming agent, 1-3 parts of expanding agent and 780-1170 parts of quartz sand, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes; then adding 50-60 parts of water, and mixing and stirring at the speed of 135-145 r/min for 1-3 minutes;
(3) after scraping the bowl wall, adding 4-6 parts of steel fiber, and stirring at the speed of 275-295 r/min for 2-5 minutes;
and obtaining the crack-resistant self-induction sleeve grouting material.
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CN113998959B (en) * 2021-12-07 2022-04-22 哈尔滨工业大学 Structure and perception function integrated intelligent grouting material for steel bar sleeve
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