阅读说明：本技术 玄武岩纤维筋（bfrp）粘结剂配方 (Basalt fiber Bar (BFRP) binder formulation ) 是由 林加剑 王朝成 韦天下 于 2020-05-29 设计创作，主要内容包括：本发明提供两种玄武岩纤维筋(BFRP)与锚具粘结剂配方,尤其是对于玄武岩纤维筋材料的锚固问题。具体为环氧树脂1号和环氧树脂2号,环氧树脂1号材料配比为：环氧树脂：聚酰胺树脂：丙酮：固化剂：石英砂=1:0.45:0.15:1:15,1号配方中没有加入纤维材料,也可以根据具体应用环境进行调整,纤维材料比例范围为0.2-0.5,环氧树脂2号材料配比为：环氧树脂：聚酰胺树脂：丙酮：固化剂:石英砂：玄武岩纤维=1:0.5:0.1:1:15:0.4,2号配方中加入了玄武岩纤维材料,可以根据具体应用环境对玄武岩纤维含量进行调整,纤维材料调整比例范围为0.2-0.5。本发明粘结剂制作的工艺简单、成本较低,大小和形状的变化较多,使之可以满足高抗拉强度脆性锚杆锚固的要求,适用范围广。(The invention provides two basalt fiber Bar (BFRP) and anchor binder formulas, and particularly relates to the problem of anchoring of basalt fiber bar materials. Specifically, the epoxy resin 1 and the epoxy resin 2 are prepared from the following materials in parts by weight: epoxy resin: polyamide resin: acetone: curing agent: quartz sand =1:0.45:0.15:1:15, no fiber material is added in the formula 1, and the formula can be adjusted according to the specific application environment, the proportion range of the fiber material is 0.2-0.5, and the proportion of the epoxy resin material No. 2 is as follows: epoxy resin: polyamide resin: acetone: curing agent quartz sand: basalt fiber =1:0.5:0.1:1:15:0.4, and basalt fiber material is added into the No. 2 formula, so that the content of the basalt fiber can be adjusted according to the specific application environment, and the adjustment proportion range of the fiber material is 0.2-0.5. The adhesive has the advantages of simple preparation process, low cost, more changes of size and shape, capability of meeting the anchoring requirement of the brittle anchor rod with high tensile strength and wide application range.)

1. The basalt fiber Bar (BFRP) and anchor binder formula specifically comprises epoxy resin No. 1 and epoxy resin No. 2, wherein the epoxy resin No. 1 comprises the following materials in percentage by weight: epoxy resin: polyamide resin: acetone: curing agent: quartz sand =1:0.45:0.15:1:15, no fiber material is added in the formula 1, and the formula can be adjusted according to the specific application environment, the proportion range of the fiber material is 0.2-0.5, and the proportion of the epoxy resin material No. 2 is as follows: epoxy resin: polyamide resin: acetone: curing agent quartz sand: basalt fiber =1:0.5:0.1:1:15:0.4, and basalt fiber material is added into the No. 2 formula, so that the content of the basalt fiber can be adjusted according to the specific application environment, and the adjustment proportion range of the fiber material is 0.2-0.5.

2. The epoxy resin formulation No. 1 of claim 1, wherein: the polyamide resin content is less than 0.45, the acetone content is less than 0.15, and the curing agent content is less than 1.

3. The epoxy resin formulation No. 2 of claim 1, wherein: the polyamide resin content is less than 0.5, the acetone content is less than 0.1, the curing agent content is less than 1, and the basalt fiber content is less than 0.4.

4. The epoxy formulation No. 1 and epoxy formulation No. 2 of claim 1, wherein: the epoxy resin content is less than 1.

Technical Field

The invention relates to the technical field of nonmetal anchor rod support, in particular to bonding between a basalt fiber Bar (BFRP) anchor rod and an anchor cable tool, and specifically relates to a bonding formula of a basalt fiber bar and an anchor cable tool.

Background

The anchor cable has wide application prospect in geological disaster protection engineering, but the most anchoring materials at present are steel bars and cement mortar, and the anchor cable can have good durability under normal environmental conditions. However, in a highly corrosive environment, the service performance and durability of the structure are often affected by the corrosion of the steel bars and the concrete. The investigation of relevant experts and mechanisms at home and abroad shows that the corrosion of the anchor rod (cable) becomes a problem which is widely concerned by countries in the world, and the current common method for solving the problem is to spray a preservative on the surface of steel or improve the corrosion resistance of the steel by changing the physical and chemical components of the steel, but the methods can increase the complexity of the installation operation of the anchor cable on one hand and greatly increase the construction cost on the other hand. Meanwhile, as the anchoring engineering has complexity and high concealment, the quality problem is difficult to find, and the accident handling is complex.

In order to solve the corrosion problem of the anchor cable, Fiber Reinforced Polymer (FRP) anchors have been studied to replace the conventional steel anchors since the 90 s of the last century. Compared with the traditional steel material, the fiber reinforced material has the following advantages: (1) the corrosion resistance and the durability are good; (2) high tensile strength (equal to or even higher than high strength steel bars); (3) the dead weight is light, and is only 15 to 20 percent of the reinforcing steel bar; (4) low relaxation and small load loss; (5) the fatigue resistance is excellent, and the fatigue strength is generally 3 times of that of steel; (6) the magnetic material is non-magnetic, and can be used in structures with special requirements such as radar stations, radio stations, national defense engineering and the like; (7) the axial thermal expansion coefficient is low, and the device can adapt to larger climate change.

The nonmetal fiber ribs are used as tension members, and the axial high tensile strength of the tension members can be fully exerted; the corrosion resistance of the non-metallic material can make the anchoring more durable, and no corrosion prevention treatment is needed; the integral structure of the anchor cable is simpler, the transportation, the processing, the installation and the like are more convenient, and the advantage is more obvious especially for projects in corrosive environments; the non-magnetic property of the non-metallic material can overcome the natural defect of the metal anchor cable in the aspect of preventing the striking of electromagnetic weapons, so that the magnetic field environment in the engineering is not influenced, and the non-magnetic anchor cable can be widely applied to some engineering environments with higher requirements on magnetic field characteristics.

Non-metallic cables, while having significant engineering advantages in strength, durability and density over steel, are mostly brittle materials with a failure in the form of brittle failure with no significant signs prior to failure. The fiber reinforced material is a brittle material, so that the connection problem between the anchor cable and the anchorage device exists in engineering application, and a reasonable bonding formula is selected, so that the fiber reinforced material has mechanical properties matched with a fiber bar material, and a simple and efficient construction process is provided.

In conclusion, the research on the nonmetal anchor cable has important engineering application value, and in order to solve the problem of connection between the basalt fiber rib and the anchorage, the invention provides a binder formula suitable for the Basalt Fiber Rib (BFRP) and the anchorage. The formula is used in combination with a corresponding anchorage device, the mechanical property of the formula meets the requirement, the construction process is simple and efficient, and the formula can be widely applied to geological disaster prevention and control engineering and has wide application prospect.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a bonding formula which meets the requirements of the anchoring mechanical property of the basalt fiber rib, so that the basalt fiber rib anchor cable has a simple, economic, efficient and stable anchoring method in engineering application, overcomes the defects caused by the brittleness of the basalt fiber rib material, and solves the technical problems provided in the background.

The technical problem solved by the invention is realized by adopting the following technical scheme:

determination of bonding material of anchorage device

The basalt fiber bar is low in transverse shear strength, stress concentration is easy to occur at the joint of the basalt fiber bar and an anchorage device, so that partial fibers are broken, and the overall strength of the whole basalt fiber bar is influenced. The traditional prestressed steel strand clamping piece type anchorage device is easy to have stress concentration at the end part and difficult to meet the anchoring requirement. The invention carries out drawing test research on 12 bonding modes with different formulas, and the test device is shown in figure 1.

The required bonding material comprises epoxy resin, polyamide resin, acetone, a curing agent, quartz sand, glass fiber, steel fiber and basalt fiber, and the bonding mode adopting different formulas is tested, and the length of a test piece for testing the length of the end clamping piece is one third of the length of the test piece during the test.

Second, mechanical property test of bonding material

The main bonding material adopted by the anchor and the clamping piece material is epoxy resin, the specific formula of the material is different, the formula corresponding to the anchor is epoxy resin No. 1, the formula corresponding to the clamping piece is epoxy resin No. 2, and the picture 2 is a test photo and corresponds to the picture 2 in the picture 1. During testing, the basalt fiber bars are placed in the clamping pieces, and the epoxy resin No. 2 formula is adopted, so that a test piece is installed; then standing the mounted test piece, clamping piece and anchor for more than 24 hours, wherein the purpose of the step is to completely solidify the binder; and finally, performing a tensile test through the device in the figure 1, and obtaining a test result of the tensile fracture damage of the middle part of the basalt fiber rib through multiple tests. The test result shows that the adhesive has matched strength under a certain formula.

Third, verification test of adhesive material formula

After the anchorage device and the clamping piece are selected, a plurality of times of tensile tests are carried out on the bonding formula. The test result shows that the stretch-breaking mode of the basalt fiber rib is in a lantern shape, and a yield platform does not appear in the loading process from loading to complete stretch-breaking. When the external load reaches the ultimate tensile strength, the denaturation energy accumulated by the basalt fiber ribs is released instantly to form a lantern-shaped damage mode at the fracture part.

The anchor is manufactured by adopting an epoxy resin No. 1 formula, and the manufacturing process is matched with the geometric dimension of a specific clamping piece, so that the anchor can be accurately installed during the test. Because the basalt fiber rib has stronger tensile property, an anchor ring is additionally arranged on the outer layer of the anchorage device for protection during the recommended test, so that instant explosion is prevented.

The clamping piece is manufactured by adopting an epoxy resin No. 2 formula, and the geometric dimension of the clamping piece is determined according to the specific diameter of the basalt fiber rib during manufacturing. The clip length is one third, but not limited to one third, of the specimen length.

The basalt fiber bar test piece is installed by adopting an epoxy resin No. 2 formula, acetone is adopted for cleaning before installation, and standing is carried out for 24 hours or more after installation. The adopted test device is a self-made assembled stretching device, wherein the selection of the hydraulic oil source model is determined according to the ultimate tensile strength of a specific test piece. Tensile testing can also be performed on a tensile tester, see fig. 3, but the clips are redesigned to match the clamp size of the tensile tester.

Compared with the prior art, the invention has the beneficial effects that:

the key point of the invention is that on the basis of the test of various bonding formulas, two ideal formulas which can be used for protection engineering application are optimized, and two bonding agent formulas are provided, namely epoxy resin No. 1 and epoxy resin No. 2.

The two sizing formulas provided by the invention can be applied to different diameters of basalt fiber bars, only the geometric dimensions of the anchorage device and the clamping piece need to be adjusted, and the two sizing formulas have strong plasticity and are suitable for popularization and use in engineering practice.

Drawings

FIG. 1 is a mechanical property testing device of the binder, wherein 1 is a basalt fiber rib, 2 is an anchorage device, 3 is a force application device, 4 is a jack shell, and 5 is a hydraulic pressure gauge.

FIG. 2 is a photograph showing the clip and the anchor of the present invention, wherein the clip is made of epoxy resin No. 2, and the anchor is made of epoxy resin No. 1.

FIG. 3 is another device for testing mechanical properties of a binder according to the present invention, which can record the stress-strain relationship in real time.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining the specific drawings.

As shown in fig. 1-3, the basalt fiber Bar (BFRP) and anchor binder formulation comprises two types, namely epoxy resin 1 and epoxy resin 2, the main components of the two formulations are epoxy resin, polyamide resin, acetone, a curing agent and quartz sand, the materials in the main components are prepared according to a certain proportion according to specific manufacturing objects, the epoxy resin 1 and the epoxy resin 2 are suitable for two different stress positions, the stress characteristics have certain difference, the corresponding binder formulation is prepared according to the stress characteristics, and the two different formulations are applied to the basalt fiber bar anchoring engineering, so that the high tensile mechanical characteristics of the basalt fiber bar can be fully exerted.

The epoxy resin No. 1 material comprises the following components in percentage by weight: epoxy resin: polyamide resin: acetone: curing agent: the ratio of the quartz sand =1:0.45:0.15:1:15, no fiber material is added in the formula 1, and the fiber material can be adjusted according to the specific application environment, and the ratio range of the fiber material is 0.2-0.5.

The epoxy resin No. 2 material comprises the following components in percentage by weight: epoxy resin: polyamide resin: acetone: curing agent quartz sand: basalt fiber =1:0.5:0.1:1:15:0.4, and basalt fiber material is added into the No. 2 formula, so that the content of the basalt fiber can be adjusted according to the specific application environment, and the adjustment proportion range of the fiber material is 0.2-0.5.

Referring to fig. 1, the main bonding material used for the anchor and the clip material is epoxy resin, and the specific formulations thereof are different, the formula corresponding to the anchor is epoxy resin No. 1, the formula corresponding to the clip is epoxy resin No. 2, and fig. 2 is a test photograph corresponding to fig. 1, 2. During testing, the basalt fiber bars are placed in the clamping pieces, and the epoxy resin No. 2 formula is adopted, so that a test piece is installed; then standing the mounted test piece, clamping piece and anchor for more than 24 hours, wherein the purpose of the step is to completely solidify the binder; and finally, performing a tensile test through the device in the figure 1, and obtaining a test result of the tensile fracture damage of the middle part of the basalt fiber rib through multiple tests. The test result shows that the adhesive has matched strength under a certain formula.

Referring to fig. 2, the main bonding material used for the anchor and the clip is epoxy resin, and the specific formulations thereof are different, the formula corresponding to the anchor is epoxy resin No. 1, the formula corresponding to the clip is epoxy resin No. 2, and fig. 2 is a test photograph corresponding to fig. 1, 2. During testing, the basalt fiber bars are placed in the clamping pieces, and the epoxy resin No. 2 formula is adopted, so that a test piece is installed; then standing the mounted test piece, clamping piece and anchor for more than 24 hours, wherein the purpose of the step is to completely solidify the binder; and finally, performing a tensile test through the device in the figure 1, and obtaining a test result of the tensile fracture damage of the middle part of the basalt fiber rib through multiple tests. The test result shows that the adhesive has matched strength under a certain formula.

Referring to fig. 3, the main bonding material used for the anchor and the clip is epoxy resin, and the specific formulations thereof are different, the formula corresponding to the anchor is epoxy resin No. 1, the formula corresponding to the clip is epoxy resin No. 2, and fig. 2 is a test photograph corresponding to fig. 1 and 2. During testing, the basalt fiber bars are placed in the clamping pieces, and the epoxy resin No. 2 formula is adopted, so that a test piece is installed; then standing the mounted test piece, clamping piece and anchor for more than 24 hours, wherein the purpose of the step is to completely solidify the binder; and finally, performing a tensile test through the device in the figure 1, and obtaining a test result of the tensile fracture damage of the middle part of the basalt fiber rib through multiple tests. The test result shows that the adhesive has matched strength under a certain formula.

Example 1

The epoxy resin No. 1 material comprises the following components in percentage by weight: epoxy resin: polyamide resin: acetone: curing agent: the ratio of the quartz sand =1:0.45:0.15:1:15, no fiber material is added in the formula 1, and the fiber material can be adjusted according to the specific application environment, and the ratio range of the fiber material is 0.2-0.5.

The epoxy resin No. 2 material comprises the following components in percentage by weight: epoxy resin: polyamide resin: acetone: curing agent quartz sand: basalt fiber =1:0.5:0.1:1:15:0.4, and basalt fiber material is added into the No. 2 formula, so that the content of the basalt fiber can be adjusted according to the specific application environment, and the adjustment proportion range of the fiber material is 0.2-0.5.

At present, most of anchoring materials are steel bars and cement mortar, and the anchor cable can have good durability under normal environmental conditions. However, in a highly corrosive environment, the service performance and durability of the structure are often affected by the corrosion of the steel bars and the concrete. In order to solve the problem of durability of the anchor rod in engineering practice, the corrosion-resistant basalt fiber rib is adopted to replace a steel bar, the limit tensile strength of the basalt fiber rib is greater than that of the steel bar, but the basalt fiber rib is a brittle material. For brittle materials, the anchorage device suitable for reinforcing steel bar materials can not meet the requirement of mechanical property, the invention provides two binder formulas, namely epoxy resin No. 1 and epoxy resin No. 2, and better solves the problem that basalt fiber bars are difficult to anchor by a traditional method due to brittleness. The two binder schemes provided by the invention do not represent that the invention is only limited to the problem of binding the basalt fiber rib with a brittle material, and the test result can also be applied to other common brittle materials.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.