CN107500690B - Quick traffic concrete for repairing cement concrete pavement pit slot - Google Patents
Quick traffic concrete for repairing cement concrete pavement pit slot Download PDFInfo
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- CN107500690B CN107500690B CN201710837632.7A CN201710837632A CN107500690B CN 107500690 B CN107500690 B CN 107500690B CN 201710837632 A CN201710837632 A CN 201710837632A CN 107500690 B CN107500690 B CN 107500690B
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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
- C04B28/06—Aluminous cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a quick traffic concrete for repairing a pit slot of a cement concrete pavement, which consists of the following raw materials in specific proportion: composite cement, wear-resistant medium sand, broken stone, water, a polycarboxylic acid water reducing agent and a composite additive. Wherein the content of the first and second substances,the inorganic cement-based cementing material is used for modification, so that the problems of high cost and poor repairing effect of an asphalt concrete repairing material are solved, and the problems of low hardening speed, long traffic interruption time and later strength shrinkage of common cement concrete are solved. By adding C into P.S42.5 cement2S improves the later strength of the concrete, shortens the induction period and the setting time of cement hydration through the composite admixture, and realizes high early strength and controllable setting and hardening time. The method for repairing the pit of the cement concrete pavement can meet the requirements of quick traffic of 2h, 5h, 12h and the like, and has important values for realizing low cost of pavement maintenance and quick traffic recovery.
Description
Technical Field
The invention belongs to the technical field of maintenance and repair of cement concrete pavements, and particularly relates to quick traffic concrete for repairing a pit slot of a cement concrete pavement.
Background
The cement concrete pavement is the main structural form of road networks and highway pavements in China, and has the characteristics of low cost, high strength and the like. However, with the development of domestic economy and the increase of heavy-load traffic, most of concrete in operation has various diseases, wherein the diseases of pavement slab pits are one important disease type. At present, the repairing of pit and groove diseases is mainly carried out by adopting asphalt mixture, but the problems of poor interface bonding and inconsistent deformation exist in inorganic materials such as organic materials and cement concrete, and the pit and groove repaired by the asphalt mixture can be completely damaged 3-4 months after the repairing because the asphalt mixture has strong sensitivity to water, so that the outstanding problems of high maintenance cost and poor repairing effect are caused; if ordinary concrete is adopted for repair, the time for traffic interruption is too long due to long hardening time and maintenance time.
Disclosure of Invention
The invention aims to provide the rapid traffic concrete for repairing the pit on the cement concrete pavement, which has the advantages of low cost, good effect, good durability and wear resistance, rapid hardening and controllability.
In order to solve the technical problems, the invention adopts the following technical scheme:
the quick traffic concrete for repairing the pit and the groove of the cement concrete pavement comprises the following raw materials in percentage: 19% of composite cement, 29% -31% of wear-resistant medium sand, 44% -46% of broken stone, 6% -6.6% of water, 0.19% of polycarboxylic acid water reducing agent and trace amount of composite additive; the composite admixture consists of composite set regulating agent and early strength agent, the composite set regulating agent accounts for 0-0.2 wt% of the composite cement, and the early strength agent accounts for 0-0.06 wt% of the composite cement.
The composite cement is C2S-modified sulphoaluminate cement R.S42.5, wherein C2The S content is 4.8 percent, and the weight ratio of the S content to the sulphoaluminate cement is 1: 3.
The wear-resistant medium sand consists of river sand and steel slag according to the mass ratio of 10: 1.
The sand rate of the concrete is between 38 and 42 percent.
The particle size of the crushed stone is between 3 and 20 mm.
The composite set regulator is a mixture of sodium citrate, sodium gluconate and boric acid in the weight ratio of 2: 1: 3, and the early strength agent is lithium chloride.
Aiming at the problems existing in the existing cement concrete pavement repairing, the inventor develops a rapid traffic concrete for repairing a pit slot of a cement concrete pavement, and the concrete is composed of the following raw materials in a specific proportion: composite cement, wear-resistant medium sand, broken stone, water, a polycarboxylic acid water reducing agent and a composite additive. The inorganic cement-based cementing material is used for modification, so that the problems of high cost and poor repairing effect of an asphalt concrete repairing material are solved, and the problems of low hardening speed, long traffic interruption time and later strength shrinkage of common cement concrete are solved. By adding C into P.S42.5 cement2S improves the later strength of the concrete, shortens the induction period and the setting time of cement hydration through the composite admixture, and realizes high early strength and controllable setting and hardening time. The method for repairing the pit of the cement concrete pavement can meet the requirements of quick traffic of 2h, 5h, 12h and the like, and has important values for realizing low cost of pavement maintenance and quick traffic recovery.
Detailed Description
Examples
The basic formula is as follows: 450kg of composite cement, 710kg of wear-resistant medium sand, crushed stone (362 kg of large stone and 760kg of small stone), 4.5kg of polycarboxylic acid water reducing agent, 0.09-1.12kg of composite additive and 153kg of water. Wherein the content of the first and second substances,
the composite cement is C2S modified sulphoaluminate cement R.S42.5 (Guangxi Yunyan brand), C2The S content is 4.8 percent, and the weight ratio of the S content to the sulphoaluminate cement is 1: 3.
The wear-resistant medium sand consists of river sand (sand in river sand II area of Xinlong sand field) and steel slag according to the mass ratio of 10: 1.
The sand rate of the concrete is between 38% and 42%, and fine adjustment is carried out within the sand rate range according to the actual workability of the concrete.
The broken stones (Guangxi Fuda stone field) comprise two grades of broken stones, wherein the small stones are 4.75-9.5mm, and the large stones are 9.5-19 mm.
The polycarboxylate superplasticizer (TKA-2 type polycarboxylate superplasticizer produced by Chongqing Tongtong building materials Co., Ltd., the water reduction rate is more than 25%) accounts for 1% of the cement weight.
The composite admixture consists of composite set regulating agent and early strength agent, the composite set regulating agent accounts for 0-0.2 wt% of the composite cement, and the early strength agent accounts for 0-0.06 wt% of the composite cement.
The composite set control agent (Suzhou Shendu fine chemical industry Co., Ltd.) is a mixture of sodium citrate, sodium gluconate and boric acid in a weight ratio of 2: 1: 3, and the early strength agent is lithium chloride (Sichuan lithium).
The hardening time of the rapid traffic concrete for repairing the pits and the grooves of the cement concrete pavement with the formula is within 20 minutes, the 2-hour compressive strength is 30MPa, the 12-hour bending tensile strength is 4.5MPa, and the 28-day compressive strength is 50MPa, the bending tensile strength is 5.0MPa and is far higher than that of common concrete. The concrete mixture is convenient to construct, can be manually stirred on site, and does not need to be vibrated. According to the time requirement of open traffic, 2h, 5h and 12h open traffic can be realized by controlling the proportion of the composite set control agent and the lithium chloride (tables 1-3).
TABLE 12 hours open traffic
| Ambient temperature | Lithium chloride | Composite coagulation regulator | Construction time |
| ＞25℃ | 0.04％-0.06％ | 0.05％-0.2％ | 10±2mim |
| 10℃～25℃ | 0.04％-0.06％ | 0-0.05％ | 10±2min |
| 0℃～10℃ | 0.04％-0.06％ | 0 | 10±2min |
TABLE 25 hours open traffic
| Ambient temperature | Lithium chloride | Composite coagulation regulator | Construction time |
| ＞25℃ | 0.00％-0.02％ | 0.05％-0.1％ | 20±5min |
| 10℃～25℃ | 0.01％-0.02％ | 0-0.05％ | 20±5min |
| 0℃～10℃ | 0.03％-0.05％ | 0 | 20±5min |
Open traffic for 312 hours
| Ambient temperature | Lithium chloride | Composite coagulation regulator | Construction time |
| ＞25℃ | 0 | 0-0.05％ | 40±10min |
| 10℃～25℃ | 0.00％-0.02％ | 0-0.05％ | 40±10min |
| 0℃～10℃ | 0.02％-0.04％ | 0 | 40±10min |
The rapid traffic concrete for repairing the pit and the groove is applied to a damaged road surface, has been operated for about 1 year so far, still has good use effect, is firmly bonded, and has no deformation and damage.
Claims (4)
1. The quick traffic concrete for repairing the pit slot of the cement concrete pavement is characterized by comprising the following raw materials in percentage by weight: 19% of composite cement, 29% -31% of wear-resistant medium sand, 44% -46% of broken stone, 6% -6.6% of water, 0.19% of polycarboxylic acid water reducing agent and trace amount of composite additive; the composite admixture consists of a composite set control agent and an early strength agent, wherein the composite set control agent accounts for 0-0.2% of the weight of the composite cement, and the early strength agent accounts for 0-0.06% of the weight of the composite cement; the weight ratio of the composite set control agent is 2: 1: 3, the mixture of sodium citrate, sodium gluconate and boric acid, and the early strength agent is lithium chloride; the composite cement is C2S-modified sulphoaluminate cement R.S42.5, wherein C2The S content is 4.8%, and the weight ratio of S to sulphoaluminate cement is 1: 3; the composite set control agent and the early strength agent account for not 0 percent of the weight of the composite cement.
2. The rapid traffic concrete for repairing pits and grooves in cement concrete pavements according to claim 1, which is characterized in that: the wear-resistant medium sand is composed of river sand and steel slag according to the mass ratio of 10: 1.
3. The rapid transit concrete for pit and trench restoration in a cement concrete pavement according to claim 1, wherein the sand ratio of the concrete is between 38% and 42%.
4. The rapid traffic concrete for repairing pits and grooves in cement concrete pavements according to claim 1, which is characterized in that: the particle size of the crushed stone is between 3 and 20 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710837632.7A CN107500690B (en) | 2017-09-15 | 2017-09-15 | Quick traffic concrete for repairing cement concrete pavement pit slot |
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| CN107500690A CN107500690A (en) | 2017-12-22 |
| CN107500690B true CN107500690B (en) | 2020-09-15 |
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| CN109734370A (en) * | 2019-03-14 | 2019-05-10 | 招商局重庆交通科研设计院有限公司 | A kind of cement concrete repair materials and preparation method thereof |
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| US8715409B2 (en) * | 2010-05-07 | 2014-05-06 | Pkl Corporation | Fast setting low permeability cement and concrete |
| CN102503322A (en) * | 2011-10-27 | 2012-06-20 | 北京东方雨虹防水技术股份有限公司 | Preparation method for material capable of being used for rapid rush-repair of roads |
| CN103360001B (en) * | 2013-07-10 | 2015-08-26 | 中交公路养护工程技术有限公司 | The complete thick formula repairing high-early-strength type concrete of cement concrete pavement |
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Address after: No.6, Gaoxin 2nd Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region Patentee after: Guangxi Jiaoke Group Co.,Ltd. Address before: 530007 No. 6 hi-tech two road, XiXiangTang District, Nanning, the Guangxi Zhuang Autonomous Region Patentee before: GUANGXI TRANSPORTATION RESEARCH & CONSULTING Co.,Ltd. |