CN112945663B - 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

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Publication number
CN112945663B
CN112945663B CN202110111096.9A CN202110111096A CN112945663B CN 112945663 B CN112945663 B CN 112945663B CN 202110111096 A CN202110111096 A CN 202110111096A CN 112945663 B CN112945663 B CN 112945663B
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concrete
asphalt
concrete base
rod piece
hydraulic
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CN112945663A (en
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屈漫利
付浩东
滕振敏
刘时明
王宁坤
丁立鸿
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Xian University of Technology
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Xian University of Technology
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    • 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

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 a 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 15cm.
And 4, paving the asphalt mixture with the thickness of 30cm.
The rolling compaction process in the step 4 comprises the following specific steps: after the temperature of the paved asphalt mixture reaches the primary rolling temperature, canvas covering and rolling are carried out according to construction parameters and the vibration roller adopting 3T double vibration, and the canvas is taken down 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 100mm.
And 5, extending the drill hole into the concrete base by a depth of not less than 5cm.
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 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.
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 concrete bases of the paving test are arranged, the length is not less than 30m, the thickness is not less than 15cm, the concrete bases of the paving test have the same mark number as a dam concrete base, the paving test comprises two parts of contact surface trial treatment with the concrete base and asphalt concrete trial paving, and the asphalt concrete trial paving of the paving test comprises 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 2.36 mm) 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 proportioning 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 15s; 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 in order that newly-built asphalt concrete fully exhausts the scumming, protects newly-built asphalt concrete aspect simultaneously, avoids the raise dust pollution.
The 3T double-vibration rolling is adopted, 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 depth of each drilled hole extending into the concrete base is not less than 5cm 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, and if the depth of each drilled hole extending into the concrete base is less than 5cm, a fracture surface is easy to appear on the junction surface of the asphalt concrete and the concrete base, so that the real 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. If the concrete is not qualified, 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 diluted asphalt proportion and the construction process, or changing the asphalt mortar proportion and the construction process.
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 15cm; 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 (1)

1. A method for detecting the cohesiveness of hydraulic asphalt concrete and a concrete base is characterized by comprising 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; the construction parameters comprise equipment type selection, rolling temperature and rolling times;
step 3, pretreating the concrete base, and heating and uniformly mixing the asphalt concrete raw material to obtain an asphalt mixture;
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, and brushing asphalt mortar after the diluted asphalt is dried;
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;
the tension member is deformed steel bar with the diameter of 16 mm;
the pre-embedding depth of the pull rod piece in the asphalt mixture is 15cm;
the thickness of the paved asphalt mixture is 30cm;
the concrete process of rolling compaction comprises the following steps: after the temperature of the paved asphalt mixture reaches the primary rolling temperature, canvas is covered and rolled by adopting a 3T double-vibration roller according to construction parameters, and the canvas is taken down after the rolling is finished;
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 a concrete base to obtain a core column containing the pulled rod piece;
the diameter of a drilled hole drilled outside the pull rod piece by using the concrete core drilling machine is 100mm;
the depth of the drill hole extending into the concrete base is not less than 5cm;
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 bonding property of the hydraulic asphalt concrete and the concrete base is qualified or not according to the broken surface;
the specific process for judging whether the cohesiveness of the hydraulic asphalt concrete and the concrete base is qualified or not according to the fracture surface 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.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (2)

* 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
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
水泥混凝土桥面防水粘结材料性能试验研究;杨子业等;《城市道桥与防洪》;20070915(第09期);147-151页 *

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