CN112945663A - Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base - Google Patents

Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base Download PDF

Info

Publication number
CN112945663A
CN112945663A CN202110111096.9A CN202110111096A CN112945663A CN 112945663 A CN112945663 A CN 112945663A CN 202110111096 A CN202110111096 A CN 202110111096A CN 112945663 A CN112945663 A CN 112945663A
Authority
CN
China
Prior art keywords
concrete
asphalt
concrete base
hydraulic
cohesiveness
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.)
Granted
Application number
CN202110111096.9A
Other languages
Chinese (zh)
Other versions
CN112945663B (en
Inventor
屈漫利
付浩东
滕振敏
刘时明
王宁坤
丁立鸿
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.)
Xian University of Technology
Original Assignee
Xian University of Technology
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 Xian University of Technology filed Critical Xian University of Technology
Priority to CN202110111096.9A priority Critical patent/CN112945663B/en
Publication of CN112945663A publication Critical patent/CN112945663A/en
Application granted granted Critical
Publication of CN112945663B publication Critical patent/CN112945663B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Road Repair (AREA)

Abstract

The invention discloses a method for detecting the cohesiveness of hydraulic asphalt concrete and a concrete base, which is implemented according to the following steps: selecting an asphalt concrete raw material; carrying out a paving test to obtain construction parameters required by construction; pretreating the concrete base, and heating and uniformly mixing the asphalt concrete raw material to obtain an asphalt mixture; paving an asphalt mixture on the surface of the pretreated concrete base, embedding a pull rod piece in the asphalt mixture, and rolling and compacting to form a spreading layer; drilling a hole outside the pull rod piece by using a concrete core drilling machine, wherein the drilled hole extends into the concrete base; connecting the pulled rod piece with a loading force-bearing device, increasing the stress of the pulled rod piece through the loading force-bearing device until the core column is broken, and judging whether the cohesiveness of the hydraulic asphalt concrete and the concrete base is qualified or not according to the broken surface; through pre-burying the pull rod piece, the cohesiveness of the hydraulic asphalt concrete and the concrete base is detected, and the interference of human factors is avoided.

Description

Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base
Technical Field
The invention belongs to the technical field of water conservancy and hydropower seepage-proofing engineering, and relates to a method for detecting the cohesiveness of hydraulic engineering asphalt concrete and a concrete base.
Background
As a commonly used seepage-proofing structure of hydraulic and hydroelectric engineering, the asphalt concrete seepage-proofing core wall is connected with a bedrock, a concrete seepage-proofing wall and a bank slope through a concrete base. The asphalt concrete core wall-concrete base-bed rock and impervious curtain or the asphalt concrete core wall-concrete base-concrete impervious wall form a rock-fill dam impervious system; the bonding of the joint surface of the asphalt concrete core wall and the dam foundation concrete base is one of weak load bearing links of an anti-seepage system, and the detection of the bonding of the joint surface of the asphalt concrete core wall and the dam foundation concrete base is of great importance.
The task of detecting the bonding property of the joint surface of the asphalt concrete core wall and the dam foundation concrete base is arranged in an off-site paving test before the construction of the asphalt concrete core wall. At present, in a paving test, a method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base is only limited to drilling and taking a core sample, an observation method is used for observing the appearance phenomenon of the joint of the hydraulic asphalt concrete of the core sample and the concrete base surface, the cohesiveness of the hydraulic asphalt concrete and the concrete base is judged by combining engineering experience of technicians, the detection result is greatly influenced by human factors, and the cohesiveness of the hydraulic asphalt concrete and the concrete base is difficult to obtain a unified standard.
Disclosure of Invention
The invention aims to provide a method for detecting the cohesiveness of hydraulic engineering asphalt concrete and a concrete base, which solves the problem that evaluation standards are inconsistent due to the influence of human subjective factors in the conventional method for judging the cohesiveness of the hydraulic engineering asphalt concrete and the concrete base.
The technical scheme adopted by the invention is that the method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base is implemented according to the following steps:
step 1, selecting an asphalt concrete raw material according to the requirements of engineering design technical indexes;
step 2, carrying out a paving test to obtain construction parameters required by construction;
step 3, pretreating the concrete base, and heating and uniformly mixing the asphalt concrete raw material to obtain an asphalt mixture;
step 4, paving an asphalt mixture on the surface of the pretreated concrete base, embedding a pull rod piece in the asphalt mixture, and rolling and compacting to form a paving layer;
step 5, cooling the layer to be paved to the ambient temperature, drilling holes outside the pulled rod piece by using a concrete core drilling machine, and extending the drilled holes into the concrete base to obtain a core column containing the pulled rod piece;
and 6, connecting the pulled rod piece with a loading force-bearing device, increasing the stress of the pulled rod piece through the loading force-bearing device until the core column is broken, and judging whether the bonding property of the hydraulic asphalt concrete and the concrete base is qualified or not according to the broken surface.
The invention is also characterized in that:
and 2, the construction parameters comprise equipment type selection, rolling temperature and rolling times.
Step 3, the concrete base is pretreated by the following specific processes: chiseling the surface of the concrete base, removing scum, drying the surface, spraying diluted asphalt on the surface of the concrete base, drying the diluted asphalt, and brushing asphalt mortar on the surface.
And 4, the pulled rod piece in the step 4 is deformed steel with the diameter of 16 mm.
The pre-buried depth of pre-buried tension member in bituminous mixture is 15 cm.
And 4, paving the asphalt mixture with the thickness of 30 cm.
The rolling compaction process in the step 4 comprises the following specific steps: and after the temperature of the paved asphalt mixture reaches the primary rolling temperature, carrying out canvas covering and rolling by adopting 3T double-vibration rolling according to construction parameters, and taking down the canvas after the rolling is finished.
And 5, drilling holes outside the pulled rod piece by using a concrete core drilling machine, wherein the diameter of the drilled holes is 100 mm.
And 5, extending the drill hole into the concrete base by a depth of not less than 5 cm.
Step 6, judging whether the cohesiveness of the hydraulic asphalt concrete and the concrete base is qualified according to the fracture surface comprises the following specific processes: if the fracture surface is not at the joint surface of the hydraulic asphalt concrete and the concrete base, the hydraulic asphalt concrete and the concrete base are judged to have good cohesiveness; and if the fracture surface appears at the joint surface of the hydraulic asphalt concrete and the concrete base, judging that the adhesion between the hydraulic asphalt concrete and the concrete base is unqualified.
The invention has the beneficial effects that:
according to the method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base, the cohesiveness of the hydraulic asphalt concrete and the concrete base is detected by embedding the pull rod pieces, so that the interference of human factors is avoided, and the uniform standard for evaluating the cohesiveness of the asphalt concrete core wall and the dam foundation concrete base is conveniently formed.
Drawings
Fig. 1 is a schematic position diagram of a pre-buried tension member according to the present invention;
FIG. 2 is a schematic diagram of a fracture surface with good adhesion in the detection process of the embodiment of the present invention.
In the figure, 1, a concrete base, 2, a joint surface of asphalt concrete and the concrete base, 3, asphalt mixture, 4, a pulled rod piece and 5, a core column.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The invention relates to a method for detecting the cohesiveness of hydraulic asphalt concrete and a concrete base, which is implemented according to the following steps:
step 1, selecting an asphalt concrete raw material according to the requirements of engineering design technical indexes;
step 2, carrying out a paving test, wherein the concrete base of the paving test is arranged, the length is not less than 30m, the thickness is not less than 15cm, the concrete base of the paving test has the same mark number as the concrete base of the dam, the paving test is divided into two parts of trial processing of contact with the concrete base and trial paving of asphalt concrete, and the trial paving of the asphalt concrete of the paving test is divided into three stages of trial mixing of asphalt mixture, trial paving and trial rolling; acquiring construction parameters required by construction; the construction parameters comprise equipment type selection, rolling temperature and rolling times.
And 3, chiseling the surface of the concrete base, removing scum, drying the surface, spraying diluted asphalt on the surface of the concrete base, drying the diluted asphalt, and brushing asphalt mortar, wherein the asphalt mortar comprises asphalt, sand (the particle size is not more than 2.36mm) and mineral powder in a mass ratio of 1: 2: 2, heating and uniformly mixing the asphalt concrete raw material, and fully grading the coarse aggregate, the fine aggregate and the mineral powder according to the mineral aggregate grading of the construction mixing ratio; then the prepared mineral aggregate (the general name of coarse aggregate and fine aggregate powder) is pushed into a heating room to be dried and heated (the heating temperature of the mineral aggregate is less than or equal to 180 ℃); then the mineral aggregate is dry-mixed in a stirrer, and the dry-mixing time is more than or equal to 15 s; adding asphalt (the temperature of the asphalt is 150 +/-5 ℃) for wet mixing for more than or equal to 45s, mixing the mineral powder with the heated coarse aggregate and fine aggregate, and then uniformly mixing the mixture with the asphalt to obtain an asphalt mixture;
step 4, paving an asphalt mixture on the surface of the pretreated concrete base, and embedding a pull rod piece in the asphalt mixture, wherein the embedding depth is 15cm, and the depth is 15cm, so that the pull rod piece can be prevented from being pulled off in a test; generally, paving the asphalt concrete to a thickness not more than 30cm and compacting the asphalt concrete to a thickness of 25-27 cm according to the current hydraulic engineering asphalt concrete construction specification, wherein a pull rod piece is not positioned on a contact surface of the asphalt concrete and a concrete base, the pull rod piece is deformed steel bar with a diameter of phi 16mm, the pull rod piece can be prevented from being pulled off in a test, the thickness of the paved asphalt mixture is 30cm, the paved asphalt mixture is rolled and covered by 3T double-vibration rolling according to construction parameters after the temperature of the paved asphalt mixture reaches a primary rolling temperature, and the canvas is taken down to form a spread layer after the rolling is finished;
wherein, cover the canvas so that the bituminous concrete of new shop fully exhausts the flood, protects the bituminous concrete aspect of new shop simultaneously, avoids the raise dust pollution.
The method adopts 3T double-vibration rolling to roll, and the compaction is carried out according to three stages of static rolling leveling, vibration rolling compaction and static rolling finishing.
Step 5, cooling the layer to be paved to the ambient temperature, drilling holes outside the pulled rod piece by using a concrete core drilling machine, wherein the diameter of each drilled hole is 100mm, the drilled holes extend into the concrete base according to the tensile stress intensity of asphalt concrete, the maximum loading of loading equipment and the standard drill bit size of the concrete core drilling machine, the depth of each drilled hole extending into the concrete base is not less than 5cm, if the depth of each drilled hole is less than 5cm, a fracture surface is easy to appear on the junction surface of the asphalt concrete and the concrete base, the true stress condition cannot be reflected, and a core column containing the pulled rod piece is obtained;
step 6, connecting the pulled rod piece with a loading force-bearing device, increasing the stress of the pulled rod piece through the loading force-bearing device until the core column is broken, and judging whether the cohesiveness of the hydraulic asphalt concrete and the concrete base is qualified according to the broken surface, wherein the concrete process comprises the following steps: if the fracture surface is not at the joint surface of the hydraulic asphalt concrete and the concrete base, the hydraulic asphalt concrete and the concrete base are judged to have good cohesiveness; and if the fracture surface appears at the joint surface of the hydraulic asphalt concrete and the concrete base, judging that the adhesion between the hydraulic asphalt concrete and the concrete base is unqualified. And if the concrete base surface is unqualified, finding the reason, improving and perfecting the paving test scheme, and performing roughening, cleaning and drying treatment on the concrete base surface again, or changing the proportion and the construction process of diluted asphalt, or changing the proportion and the construction process of asphalt mortar.
Examples
The detection method is adopted for practical operation verification, and the verification process is that when the first layer of asphalt concrete is paved, a deformed steel bar tension member with the diameter of 16mm is embedded, and the embedding depth is 15 cm; after the first layer of asphalt concrete is cooled to the ambient temperature of 22 ℃ after construction is completed, drilling the core column of the pull rod receiving member in the center by using a concrete core drilling machine; connecting the pull rod piece with a loading force-bearing device, increasing the stress of the pull rod piece through the loading force-bearing device until the core column is broken, measuring the maximum load to be 2.35kN, calculating the tensile strength to be 0.30MPa (the tensile strength of asphalt concrete at 22.3 ℃ is 0.27MPa in a laboratory test), and enabling the broken surface to be positioned 19cm below the asphalt concrete layer, namely the broken surface is not positioned at the joint surface of the asphalt concrete and the concrete base, so that the bonding quality of the asphalt concrete and the concrete base is qualified, as shown in fig. 2.
The method of the invention can be obtained by carrying out multiple parallel verification and is consistent with the result of artificial judgment, and because the method of the invention directly obtains the conclusion according to the fracture surface, the method does not relate to the influence of artificial voting or other main factors.
According to the method, the binding property of the hydraulic asphalt concrete and the concrete base is detected by pre-embedding the pull rod pieces, so that the interference of human factors is avoided, the unified standard for evaluating the binding property quality of the asphalt concrete core wall and the dam foundation concrete base is convenient to form, the processing method and the quality control standard for roughening, cleaning and drying the dam foundation concrete base surface can be determined according to the detection result of the method, the diluted asphalt proportion, the mixing method, the spraying process and the quality control standard are determined, and the asphalt mortar proportion, the mixing method, the coating process and the quality control standard are determined.

Claims (10)

1. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base is characterized by comprising the following steps of:
step 1, selecting an asphalt concrete raw material according to the requirements of engineering design technical indexes;
step 2, carrying out a paving test to obtain construction parameters required by construction;
step 3, pretreating the concrete base, and heating and uniformly mixing the asphalt concrete raw material to obtain an asphalt mixture;
step 4, paving an asphalt mixture on the surface of the pretreated concrete base, embedding a pull rod piece in the asphalt mixture, and rolling and compacting to form a paving layer;
step 5, cooling the layer to be paved to the ambient temperature, drilling holes outside the pulled rod piece by using a concrete core drilling machine, and extending the drilled holes into the concrete base to obtain a core column containing the pulled rod piece;
and 6, connecting the pulled rod piece with a loading force-bearing device, increasing the stress of the pulled rod piece through the loading force-bearing device until the core column is broken, and judging whether the bonding property of the hydraulic asphalt concrete and the concrete base is qualified or not according to the broken surface.
2. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete foundation according to claim 1, wherein the construction parameters in the step 2 comprise equipment type selection, rolling temperature and rolling times.
3. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein the concrete base is pretreated in the step 3 by a specific process comprising: chiseling the surface of the concrete base, removing scum, drying the surface, spraying diluted asphalt on the surface of the concrete base, drying the diluted asphalt, and brushing asphalt mortar on the surface.
4. The method for detecting the adhesion between the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein the tension member in step 4 is deformed steel bar with a diameter of 16 mm.
5. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein the pre-buried depth of the tension members pre-buried in the asphalt mixture is 15 cm.
6. The method for detecting the adhesiveness of the hydraulic asphalt concrete and the concrete base according to claim 1, wherein the thickness of the paved asphalt mixture in the step 4 is 30 cm.
7. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein the concrete rolling compaction process in step 4 is as follows: and after the temperature of the paved asphalt mixture reaches the primary rolling temperature, carrying out canvas covering and rolling by adopting 3T double-vibration rolling according to construction parameters, and taking down the canvas after the rolling is finished.
8. The method for detecting the adhesion between the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein the diameter of the drilled hole drilled outside the pulled rod by the concrete core drilling machine in the step 5 is 100 mm.
9. The method for detecting the adhesion between the hydraulic asphalt concrete and the concrete base as claimed in claim 1, wherein in the step 5, the drill hole extends into the concrete base by a depth of not less than 5 cm.
10. The method for detecting the cohesiveness of the hydraulic asphalt concrete and the concrete base according to claim 1, wherein the specific process of judging whether the cohesiveness of the hydraulic asphalt concrete and the concrete base is qualified according to the fracture surface in the step 6 is as follows: if the fracture surface is not at the joint surface of the hydraulic asphalt concrete and the concrete base, the hydraulic asphalt concrete and the concrete base are judged to have good cohesiveness; and if the fracture surface appears at the joint surface of the hydraulic asphalt concrete and the concrete base, judging that the adhesion between the hydraulic asphalt concrete and the concrete base is unqualified.
CN202110111096.9A 2021-01-27 2021-01-27 Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base Active CN112945663B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110111096.9A CN112945663B (en) 2021-01-27 2021-01-27 Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110111096.9A CN112945663B (en) 2021-01-27 2021-01-27 Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base

Publications (2)

Publication Number Publication Date
CN112945663A true CN112945663A (en) 2021-06-11
CN112945663B CN112945663B (en) 2022-11-25

Family

ID=76237838

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110111096.9A Active CN112945663B (en) 2021-01-27 2021-01-27 Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base

Country Status (1)

Country Link
CN (1) CN112945663B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001141624A (en) * 1999-11-10 2001-05-25 Tokyo Electric Power Co Inc:The Method and device for measuring asphalt strength
CN102864758A (en) * 2012-10-22 2013-01-09 安蓉建设总公司 Construction method of rolling compaction type asphalt concrete impervious core wall in high altitude and cold areas
CN109060653A (en) * 2018-09-03 2018-12-21 中国建筑科学研究院有限公司 Method and device for detecting bonding strength of bonding surface of laminated member
CN211825622U (en) * 2020-04-07 2020-10-30 山东文登抽水蓄能有限公司 Device for measuring cohesive force of sprayed concrete and rock

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001141624A (en) * 1999-11-10 2001-05-25 Tokyo Electric Power Co Inc:The Method and device for measuring asphalt strength
CN102864758A (en) * 2012-10-22 2013-01-09 安蓉建设总公司 Construction method of rolling compaction type asphalt concrete impervious core wall in high altitude and cold areas
CN109060653A (en) * 2018-09-03 2018-12-21 中国建筑科学研究院有限公司 Method and device for detecting bonding strength of bonding surface of laminated member
CN211825622U (en) * 2020-04-07 2020-10-30 山东文登抽水蓄能有限公司 Device for measuring cohesive force of sprayed concrete and rock

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨子业等: "水泥混凝土桥面防水粘结材料性能试验研究", 《城市道桥与防洪》 *

Also Published As

Publication number Publication date
CN112945663B (en) 2022-11-25

Similar Documents

Publication Publication Date Title
Liu et al. Experimental study on real-time control of roller compacted concrete dam compaction quality using unit compaction energy indices
CN104062190B (en) Shearing strength detection method for new and old pavement connecting layer material
CN104372727B (en) The mixing proportion design method of normal temperature modified asphalt
Tariq et al. Mechanical behaviour of cement-treated sand
Bonicelli et al. Laboratory analysis for investigating the impact of compaction on the properties of pervious concrete mixtures for road pavements
CN205024904U (en) Solid brick curtain structural texture
CN102967520A (en) Method for measuring aggregate crushing value
CN112945663B (en) Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base
CN115494224A (en) Method for evaluating fusion degree of new asphalt and old asphalt of hot mix plant recycled asphalt mixture
Han et al. Engineering properties and air void characteristics of cold recycled mixtures with different compaction methods
CN108169463A (en) A kind of detection method of the pervious concrete working performance based on slurry rheology
Li et al. Experimental Investigation on Influence of Molding Methods on Properties of Pervious Concrete
CN107121336A (en) The method for building up of Sandy Silt uniaxial compressive strength curve
Bulbul Ahmed et al. Improvement of soil strength using cement and lime admixtures
Sivakumar et al. Influence of testing on permeability of compacted fine soils
CN110763583A (en) Concrete strength detection method
Jiang [Retracted] Damage Mechanism of Asphalt Concrete Pavement under Different Immersion Environments
CN111335094A (en) Method for preparing flowing material by using tail dust of asphalt mixing station and backfilling engineering part
CN107476160B (en) Improvement method of laterite gravel road base layer
Sravya et al. Swell and strength characteristics of expansive soil reinforced with synthetic fibers
Zhang et al. Investigation on shear strength properties of water-bearing concrete-rock interface based on convolutional neural network recognition method
Konthesingha et al. Bond and compressive strength of masonry for locally available bricks
Zhang et al. Research on New Type of Cement-soil Piles to Reinforce Soft Soil Foundation
Hasan et al. An investigation of geomechanical and microstructural properties of full-scale jet grout column constructed in organic soil
CN115110523B (en) Screw pile integrity defect grouting repairing method

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
GR01 Patent grant
GR01 Patent grant