CN102267809A - High strength cement mortar for connecting steel bars, and preparation method thereof - Google Patents
High strength cement mortar for connecting steel bars, and preparation method thereof Download PDFInfo
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- CN102267809A CN102267809A CN 201010196399 CN201010196399A CN102267809A CN 102267809 A CN102267809 A CN 102267809A CN 201010196399 CN201010196399 CN 201010196399 CN 201010196399 A CN201010196399 A CN 201010196399A CN 102267809 A CN102267809 A CN 102267809A
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Abstract
The invention relates to high strength cement mortar for connecting steel bars, and a preparation method thereof. The high strength cement mortar for grouting and connecting the steel bars comprises the following components, 35-70 parts of cement, 30-65 parts of graded sand, 0.3-1 parts of a water reducing agent, 0.5-2 parts of an extender, 0.5-2.5 parts of an early strength agent, 0-0.5 parts of a retarding agent and 0.05-0.1 parts of an antifoaming agent. The high strength cement mortar provided by the present invention has the following advantages that: (1) the high strength cement mortar has extremely high fluidity; (2) the mobility of the high strength cement mortar is more than 240 mm after blending, such that sufficient operation time is ensured; meanwhile the compressive strength is raised rapidly, the compressive strength is more than 50 MPa after 1 day; (3) the volume of the high strength cement mortar slightly expands so as to ensure dense filling in the perfused space; (4) the finally strength can reach more than 85 MPa.
Description
Technical field
The present invention relates to a kind of special engineered material, be specifically related to a kind ofly have high workability, reinforcing bar grouting strong, high-strength, the microdilatancy performance early and connect and use sand-cement slurry.Reinforcing bar grouting of the present invention connects with sand-cement slurry can be used for reinforcing bar grouting connection.
Background technology
In the concrete structure building operation, it is one of most important technology wherein that reinforcing bar connects.The reinforcing bar of cast-in-place concrete structure mainly adopts colligation, welding or mechanical connection method to connect, wherein mechanical connection obtains using very widely in the modern concrete building, connects but these methods of attachment all can't be used for the reinforcing bar of prefabricated concrete structure.
The structure of assembly concrete mainly adopts prefabricated components, and with the workload of a large amount of minimizings working-yard, when member was connected with member, the performance of connecting method for reinforcing bars and joint was huge to structure construction cost and security implication.Prefabricated structure builds abroad that developed country has developed many decades, and the reinforcing bar of its prefabricated components connects the main sleeve grouting method of attachment of adopting.
The grouting method of attachment is exactly the joint sleeve that inwall of connecting reinforcement insertion with ribbing of member is had concave, convex structure (for example screw thread of coarse pitch), the high strength cement mortar that a kind of nothing is shunk (or microdilatancy) injects from the grout hole on the joint sleeve sidewall, gap between reinforcing bar and the joint sleeve is full of, after treating the sand-cement slurry sclerosis, joint sleeve and two reinforcing bars promptly link together, and wherein the hardened sand-cement slurry plays the effect of transmission power between reinforcing bar and joint sleeve.
Though developed countries has been used reinforcing bar grouting interconnection technique many decades, do not see the case history or the report of relevant technologies and product practical application at present as yet in China.The import of existing domestic enterprise external grouting joint sleeve and cement mortar material product, connect the research trial of homemade reinforcing bar, but the result is unsatisfactory, and the price of imported product is very expensive, be difficult to use in the domestic construction marketing in future.
Have the grouting of not having contraction or microdilatancy and have multiple product at home with cement-based material, but these products are mainly used in the filling and the reinforcing at Equipment Foundations and building structure reconstruction reinforcing position, all can't be used for reinforcing bar grouting and connect, external reinforcing bar grouting connects the technical information that used sand-cement slurry does not have open composition and composition yet.
The present invention is intended to propose a kind of reinforcing bar grouting jointing high-strength cement mortar, this mortar material all adopts home made materials, after adding an amount of water and stirring, can between the minim gap of joint sleeve and reinforcing bar, flow fast, and be full of the gap, have suitable swelling property and high-strength characteristic simultaneously, being used for the prefabricated structure reinforcing bar connects, reinforced bar sleeve grouting joint is better than in physical dimension under the condition of foreign same type product, and the performance of joint reaches the performance index of the highest joint I level joint of national sector standard " reinforcing steel bar machinery connects the current techique rules " JGJ107 regulation.
Summary of the invention
The object of the present invention is to provide a kind of reinforcing bar grouting to connect and use high-strength cement mortar, thereby remedy the deficiency that existing reinforcing steel bar machinery method of attachment can't be used for the reinforcing bar connection of prefabricated concrete structure.
The present invention is these problems that solve by the following technical programs:
A kind of reinforcing bar grouting connects uses high-strength cement mortar, comprises the component of following weight part: 35～70 parts of cement, 30～65 parts of graded sands, 0.3～1 part of water reducer, 0.5～2 part of swelling agent, 0.1～0.5 part of hardening accelerator, 0～0.5 part of retardant, 0.05～0.1 part of defoamer.
Preferably, described reinforcing bar grouting connects the component that comprises following weight part with high-strength cement mortar: 40～50 parts of cement, 40～60 parts of graded sands, 0.5～0.8 part of water reducer, 0.75～1.25 part of swelling agent, 0.2～0.4 part of hardening accelerator, 0～0.3 part of retardant, 0.06～0.08 part of defoamer.
Wherein, described cement is quick hardening sulphoaluminate cement.Described graded sand is artificial sand or natural sand.
The fineness modulus of described graded sand is 1.6～2.5.
Described water reducer is polycarboxylate water-reducer or polycarboxylate water-reducer and mighty-100 water reducer or the composite water reducer that forms of SM water reducer.
Described polycarboxylate water-reducer is FOX-8 high-efficiency water-reducing agent of poly-carboxylic acid or PC1030 high-efficiency water-reducing agent of poly-carboxylic acid.
Described hardening accelerator is Basic Chrome Sulphate or Quilonum Retard.
Described retardant is citric acid or boric acid.
Described swelling agent is calcium oxide or ettringite class swelling agent.
Wherein, described ettringite class swelling agent is ZY cement expansive material or UEA cement expansive material.
Described defoamer is P803 defoamer or DF6352 defoamer.
The present invention also provides described reinforcing bar grouting to connect the preparation method who uses high-strength cement mortar, comprises the steps:
1) by proportioning graded sand, cement, water reducer, swelling agent, hardening accelerator, retardant, defoamer are dropped in the whipping device and stir, obtain standby mortar;
2) weight that adds in described standby mortar is the water of basis 12-18%, adopts artificial or mechanical uniform mixing to get final product.
The present invention also provides reinforcing bar grouting of the present invention to connect with high-strength cement mortar application under construction.
Reinforcing bar grouting connection of the present invention uses the initial flow degree of high-strength cement mortar greater than 300mm, degree of mobilization was greater than 240mm in 40 minutes, ultimate compression strength was greater than 50MPa in 1 day, ultimate compression strength was greater than 85MPa in 28 days, and produce small expansion in the process of setting, both had good construction performance, had excellent mechanical property again, can effectively reduce the size of joint sleeve.
Description of drawings
Fig. 1 is used for the synoptic diagram of reinforcing bar grouting joint for high-strength cement mortar of the present invention;
Fig. 2 is used for the synoptic diagram of reinforcing bar grouting-thread connecting joint for high-strength cement mortar of the present invention;
Fig. 3 is used to not have the synoptic diagram of the reinforcing bar grouting jointing of joint sleeve for high-strength cement mortar of the present invention;
Fig. 4 is used for the synoptic diagram of bar planting for high-strength cement mortar of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment, it should be understood that these embodiment only are used for the purpose of illustration, never limit protection scope of the present invention.
Reinforcing bar grouting of the present invention connects uses high-strength cement mortar, comprises the component of following weight part: 35～70 parts of cement, 30～65 parts of graded sands, 0.3～1 part of water reducer, 0.5～2 part of swelling agent, 0.1～0.5 part of hardening accelerator, 0～0.5 part of retardant, 0.05～0.1 part of defoamer.
Preferably, described reinforcing bar grouting connects the component that comprises following weight part with high-strength cement mortar: 40～50 parts of cement, 40～60 parts of graded sands, 0.5～0.8 part of water reducer, 0.75～1.25 part of swelling agent, 0.2～0.4 part of hardening accelerator, 0～0.3 part of retardant, 0.06～0.08 part of defoamer.
Wherein, described cement is quick hardening sulphoaluminate cement.
Described graded sand is artificial sand or natural sand.
The fineness modulus of described graded sand is 1.6～2.5.
Described water reducer is polycarboxylate water-reducer or polycarboxylate water-reducer and mighty-100 water reducer or the composite water reducer that forms of SM water reducer.
Described polycarboxylate water-reducer is FOX-8 high-efficiency water-reducing agent of poly-carboxylic acid or PC1030 high-efficiency water-reducing agent of poly-carboxylic acid.
Described hardening accelerator is Basic Chrome Sulphate or Quilonum Retard.
Described retardant is citric acid or boric acid.
Described swelling agent is calcium oxide or ettringite class swelling agent.Wherein, described ettringite class swelling agent is ZY cement expansive material or UEA cement expansive material.
Described defoamer is P803 defoamer or DF6352 defoamer.
All raw material of the present invention all can obtain from market easily.
It is to make by ordinary method that reinforcing bar grouting of the present invention connects with high-strength cement mortar, specifically may further comprise the steps:
1) by proportioning graded sand, cement, water reducer, swelling agent, hardening accelerator, retardant, defoamer are dropped in the whipping device and stir, obtain standby mortar with standby.
2) weight that adds by standby mortar is the water of basis 12-18%, adopts artificial or mechanical uniform mixing to use.
In use, be filled in the grout hole of reservation with special-purpose machines and tools and get final product.
Embodiment 1
The selection intensity grade is 35 kilograms of 52.5 quick hardening sulphoaluminate cements, and fineness modulus is 65 kilograms of 2.5 artificial sands, 0.3 kilogram of PC1030 polycarboxylate water-reducer, 1 kilogram in calcium oxide, 0.4 kilogram of Quilonum Retard, 0.1 kilogram of citric acid, 0.05 kilogram of DF6352 defoamer.Earlier wherein sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, stirred 3-5 minute, add 11 kilograms of entry, stirred 2-3 minute, add 1.5 kilograms of entry again, continue to stir 2-3 minute, can implement grouting subsequently.
The synoptic diagram of Fig. 1 for reinforced bar sleeve grouting-straight thread composite-joint is in the milk, as shown in Figure 1, when connecting the reinforced bar sleeve grouting-straight thread composite-joint in the member (post or wall) of vertical direction, the mortar that stirs is injected (below arrow locations) with special-purpose machines and tools from the grout hole below the splice, mortar is upwards flowed from the joint sleeve bottom, be full of the gap of reinforcing bar and joint sleeve, simultaneously the air in the joint sleeve is ejected, (upper arrow position) overflowed in the plasma discharge aperture of upper end to mortar from joint sleeve, block grouting mouth and plasma discharge mouth immediately, the grouting work of a joint promptly finishes.Then begin the grouting operation of other splice of member again, repeat above work, being in the milk until whole splices of member finishes.The grouting operation must promptly pick up counting after mortar stirs, and finishes grouting fast, and the mortar of guaranteeing each joint use is promptly finished the joint perfusion before initial set, prevent that mortar solidifies in filling process, causes connection failure.Transom guarantees that it is static relatively, stablizes by bracing or strutting arrangement, and dabbling mortar reaches when allowing to remove the intensity of bracing or strutting arrangement in the joint, the dismountable strut member of, and behind the dismounting bracing or strutting arrangement, the connection work of member is promptly accused and is finished.
Mortar of the present invention has good degree of mobilization and long presetting period, when using special-purpose machines and tools to carry out pressure grouting, the grouting complete operation time as 1 joint is 1 minute, reserve 10 minutes safety margin time, but use 30 joints of mortar continous pouring of the present invention, grouting work production efficient height.Be in the milk back 1 day at joint, mortar strength can reach 50MPa, can obviously shorten the supporting time of member, accelerates the engineer operation progress.
Embodiment 2
The selection intensity grade is 70 kilograms of 42.5 quick hardening sulphoaluminate cements, and fineness modulus is 30 kilograms of 1.6 natural sands, 0.2 kilogram of PC1030 polycarboxylate water-reducer, 0.6 kilogram of SM water reducer, 2 kilograms in calcium oxide, 0.5 kilogram of Quilonum Retard, 0.5 kilogram of boric acid, 0.1 kilogram of P803 defoamer.Earlier wherein sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, be packaged into bag after stirring as standby mortar.Add by the water of standby mortar weight after being transported to the working-yard, can implement grouting behind the stirring pulping for basis 18%.The synoptic diagram of Fig. 2 for standard reinforced bar sleeve grouting joint is in the milk.
As shown in Figure 2, when the standard reinforced bar sleeve in the member (floor or beam) of connection horizontal direction is in the milk joint, the mortar that stirs is injected (left side arrow locations) with special-purpose machines and tools from the grout hole of splice, mortar is flowed from joint sleeve one side direction opposite side, be full of the gap of reinforcing bar and joint sleeve, simultaneously the air in the joint sleeve is ejected, (right side arrow position) overflowed in plasma discharge aperture to mortar from the joint sleeve the other end, block grouting mouth and plasma discharge mouth immediately, the grouting work of a joint promptly finishes, begin the grouting operation of other splice of member again, repeat above work, being in the milk until whole splices of member finishes.Transom guarantees that by bracing or strutting arrangement it is static relatively, stable, after dabbling mortar reaches and allows to remove the intensity of bracing or strutting arrangement in the joint, and detaching device, the connection work of member is promptly accused and is finished.
Embodiment 3
The selection intensity grade is 45 kilograms of 42.5 quick hardening sulphoaluminate cements, and fineness modulus is 65 kilograms of 2.0 artificial sands, 0.8 kilogram of PC1030 polycarboxylate water-reducer, 1.25 kilograms in calcium oxide, 0.1 kilogram of Basic Chrome Sulphate, 0.3 kilogram of citric acid, 0.05 kilogram of DF6352 defoamer.Earlier wherein sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, be packaged into bag after stirring as standby mortar.Standby mortar is transported to adds behind the working-yard, stir into homogeneous slurry, can implement grouting after stirring pulping by the water of standby mortar weight for basis 14%.The synoptic diagram of Fig. 3 for pre-opened hole grouting bar splicing joint is in the milk.
As shown in Figure 3, when the pre-opened hole in the member (post or wall) of connection vertical direction is in the milk the bar splicing joint, the mortar that stirs is injected (below arrow locations) with special-purpose machines and tools from the grout hole below the splice, mortar is upwards flowed from joint pre-opened hole bottom, be full of the gap between reinforcing bar and the member pre-opened hole, simultaneously the air in the pre-opened hole is ejected, (upper arrow position) overflowed in the plasma discharge aperture of upper end to mortar from pre-opened hole, immediately grouting, the plasma discharge mouth is blocked, the grouting work of a joint promptly finishes, begin the grouting operation of other splice of member again, repeat above work, being in the milk until whole splices of member finishes.Transom guarantees that it is static relatively, stablizes by bracing or strutting arrangement, and dabbling mortar reaches when allowing to remove the intensity of bracing or strutting arrangement in the joint, the dismountable strut member of, and behind the dismounting bracing or strutting arrangement, the connection work of member is promptly accused and is finished.
Embodiment 4
The selection intensity grade is 40 kilograms of 52.5 quick hardening sulphoaluminate cements, and fineness modulus is 60 kilograms of 2.2 artificial sands, 0.2 kilogram of PC1030 polycarboxylate water-reducer, 0.6 kilogram of SM water reducer, 0.75 kilogram in calcium oxide, 0.1 kilogram of Quilonum Retard, 0.3 kilogram of citric acid, 0.05 kilogram of DF6352 defoamer.Earlier wherein sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, be packaged into bag after stirring as standby mortar.It is the water on basis 13% that standby mortar is transported to the weight that adds by standby mortar behind the working-yard, stirs into homogeneous slurry.Fig. 4 is the synoptic diagram that carries out the vertical reinforcement bar planting.
As shown in Figure 4, when on member, doing vertical reinforcement bar planting operation, with the mortar that stirs with special-purpose machines and tools or directly with pouring in the container in the member bar planting hole, again reinforcing bar is slowly inserted in the mortar in the bar planting hole, unnecessary mortar is extruded (as shown by arrows) by reinforcing bar in the hole, the closely knit gap that is full of reinforcing bar and component hole of all the other mortars, reinforcing bar and institute bar planting member guarantee that by the bracing or strutting arrangement of reinforcing bar it is relative static, stable, treat that dabbling mortar reaches when allowing to remove the intensity of bracing or strutting arrangement in the hole, remove strut member, the bar planting operation of reinforcing bar is promptly accused and is finished.
Embodiment 5
The selection intensity grade is 50 kilograms of 42.5 quick hardening sulphoaluminate cements, fineness modulus is 40 kilograms of 2.0 artificial sands, 0.5 kilogram of FOX-8 polycarboxylate water-reducer, 0.5 kilogram of mighty-100 water reducer, 0.5 kilogram of ZY cement expansive material, 0.2 kilogram of Basic Chrome Sulphate, 0.06 kilogram of DF6352 defoamer.Earlier wherein artificial sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, be packaged into bag after stirring as standby mortar.Standby mortar is transported to adds behind the working-yard by the water of standby mortar weight for basis 14%, stir into homogeneous slurry, the special use of packing into is in the milk in the facility, pour in the sleeve by the grout hole of reserving, treat to block when venting hole overflows slurries venting hole, withdraw from the grouting facility, block grout hole, grouting is finished.
Embodiment 6
The selection intensity grade is 45 kilograms of 42.5 quick hardening sulphoaluminate cements, and fineness modulus is 50 kilograms of 2.3 natural sands, 0.5 kilogram of FOX-8 polycarboxylate water-reducer, 2 kilograms of UEA cement expansive materials, 0.3 kilogram of Basic Chrome Sulphate, 0.08 kilogram of DF6352 defoamer.Earlier wherein natural sand, cement are dropped in the stirrer and stirs, again swelling agent, hardening accelerator, retardant, defoamer are dropped in the stirrer, be packaged into bag after stirring as standby mortar.Standby mortar is transported to adds behind the working-yard by the water of standby mortar weight for basis 12%, stir into homogeneous slurry, the special use of packing into is in the milk in the facility, pour in the sleeve by the grout hole of reserving, treat to block when venting hole overflows slurries venting hole, withdraw from the grouting facility, block grout hole, grouting is finished.
Reinforcing bar grouting of the present invention with the advantage of high-strength mortar is:
(1) have high flowing property, the initial flow degree reaches more than the 300mm, can fill the gap between adapter sleeve barrel and the reinforcing bar fast;
(2) adopt quick hardening sulphoaluminate cement as main gelatinous material, and the compound action by hardening accelerator and retardant is adjusted time of coagulation and hydration reaction speed, reinforcing bar grouting of the present invention is had with high-strength mortar mix and stir back 40 minutes degree of mobilization greater than 240mm, guarantee enough operable times, ultimate compression strength increases fast simultaneously, and ultimate compression strength reached more than the 50MPa in 1 day;
(3) the dabbling space of closely knit filling is guaranteed in volume microdilatancy in process of setting;
(4) reinforcing bar grouting of the present invention can reach more than the 85MPa with the high-strength mortar final strength, can effectively reduce the joint sleeve size.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (10)
1. high-strength cement mortar is used in a reinforcing bar grouting connection, it is characterized in that, comprises the component of following weight part: 35～70 parts of cement, 30～65 parts of graded sands, 0.3～1 part of water reducer, 0.5～2 part of swelling agent, 0.1～0.5 part of hardening accelerator, 0～0.5 part of retardant, 0.05～0.1 part of defoamer.
2. reinforcing bar grouting according to claim 1 connects uses high-strength cement mortar, it is characterized in that, the component that comprises following weight part: 40～50 parts of cement, 40～60 parts of graded sands, 0.5～0.8 part of water reducer, 0.75～1.25 part of swelling agent, 0.2～0.4 part of hardening accelerator, 0～0.3 part of retardant, 0.06～0.08 part of defoamer.
3. reinforcing bar grouting according to claim 1 and 2 connects uses high-strength cement mortar, it is characterized in that described cement is quick hardening sulphoaluminate cement; Described graded sand is artificial sand or natural sand.
4. reinforcing bar grouting according to claim 3 connects uses high-strength cement mortar, it is characterized in that the fineness modulus of described graded sand is 1.6～2.5.
5. reinforcing bar grouting according to claim 1 and 2 connects uses high-strength cement mortar, it is characterized in that described water reducer is polycarboxylate water-reducer or polycarboxylate water-reducer and mighty-100 water reducer or the composite water reducer that forms of SM water reducer.
6. reinforcing bar grouting according to claim 5 connects uses high-strength cement mortar, it is characterized in that described polycarboxylate water-reducer is FOX-8 high-efficiency water-reducing agent of poly-carboxylic acid or PC1030 high-efficiency water-reducing agent of poly-carboxylic acid.
7. reinforcing bar grouting according to claim 1 and 2 connects uses high-strength cement mortar, it is characterized in that described hardening accelerator is Basic Chrome Sulphate or Quilonum Retard; Described retardant is citric acid or boric acid; Described swelling agent is calcium oxide or ettringite class swelling agent; Described defoamer is P803 defoamer or DF6352 defoamer.
8. reinforcing bar grouting according to claim 7 connects uses high-strength cement mortar, it is characterized in that described ettringite class swelling agent is ZY cement expansive material or UEA cement expansive material.
9. the described reinforcing bar grouting of more than one claims connects the preparation method with high-strength cement mortar, it is characterized in that, comprises the steps:
1) by proportioning graded sand, cement, water reducer, swelling agent, hardening accelerator, retardant, defoamer are dropped in the whipping device and stir, obtain standby mortar;
2) weight that adds in described standby mortar is the water of basis 12-18%, adopts artificial or mechanical uniform mixing to get final product.
10. the described reinforcing bar grouting of claim 1-8 connects with high-strength cement mortar application under construction.
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| CN108609972A (en) * | 2018-06-05 | 2018-10-02 | 长安大学 | A kind of high-strength fast hard bolt grouting material |
| CN108609972B (en) * | 2018-06-05 | 2021-01-19 | 长安大学 | High-strength quick-hardening anchor rod grouting material |
| CN108978932A (en) * | 2018-09-19 | 2018-12-11 | 安徽建筑大学 | A kind of vertical connector of precast wall body and its connection type |
| CN109676766A (en) * | 2019-01-18 | 2019-04-26 | 广州远大住宅工业有限公司 | A kind of prefabricated components and its connection method of being in the milk |
| CN110128088A (en) * | 2019-05-21 | 2019-08-16 | 武汉沃尔浦科技有限公司 | A kind of high fluidity reinforcing bar sleeve for connection grouting material |
| CN112025968A (en) * | 2020-09-16 | 2020-12-04 | 郭冰晨 | Processing method of high-compactness concrete precast slab capable of preventing surface cracking |
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| CN102267809B (en) | 2013-06-26 |
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