CN201096711Y - Device for testing interface adhesive intensity between rubber material and cement stone - Google Patents

Abstract

The utility model relates to a device for testing bond strength of interface between crumb rubber and cement stone, belonging to a technical field of architectural material test, the prior device uses compressive strength and splitting strength to evaluate the bond strength of interface between the crumb rubber and the cement stone, but actually only integral performance of crumb rubber concrete is reflected. The device adopts cone-shaped rubber block 1 with the same material as the crumb rubber in the concrete, a pull ring 2 is arranged fixedly on big-diameter surface of the cone-shaped rubber block 1, the pull ring 2 is connected with a tray 4 at the other end by a fixed pulley 3, a weight 5 is placed on the tray 4, different interface treatment agent is spread on the small-diameter surface of the cone-shaped rubber block, moreover the small-diameter surface is buried into the fresh cement concrete, when reaching specified test ages, weights are added in the tray until the cone-shaped rubber block is separated from the surface of the cement concrete completely. The test device can reflect the bond performance of interface between the crumb rubber and the cement stone simply, rapidly and accurately.

Description

A device for testing the bond strength of rubber aggregate and cement stone interface

technical field

The utility model belongs to the technical field of building material testing. Specifically, it is a device for testing the interface bonding strength between rubber aggregates and cement stones. The test results can accurately reflect the interface bonding strength between rubber particles and cement stone matrix in rubber aggregate concrete.

Background technique

Rubber aggregate concrete is prepared by crushing waste tires into rubber particles and adding them to cement concrete, which has the advantages of good toughness, impact resistance, shock absorption and shock resistance, light weight and heat preservation, noise reduction and sound insulation, breathable and water permeable, etc. However, the strength of rubber aggregate concrete is low, which limits its engineering application to a certain extent. At present, an important method to improve the strength of this kind of concrete is to carry out surface pretreatment of rubber aggregate before it is mixed into concrete, so as to improve the performance of rubber aggregate-cement concrete. The interfacial bonding strength between the substrates can improve the overall compressive strength of the rubber aggregate concrete. But for the interfacial bond strength between rubber aggregate and cement stone matrix, there is no scientific measurement method that can well measure and reflect its bond performance.

At present, the commonly used measurement method is to use the compressive strength and splitting strength to evaluate the bond strength of the rubber aggregate and cement stone interface, but in fact it only reflects the overall performance of the rubber aggregate concrete itself, and cannot reflect well. Bonding properties of the interface between rubber aggregate and cement stone matrix. In addition, due to the small interface bonding force between the rubber aggregate and the cement stone matrix, if a traditional tensile machine is used to measure the bond strength of the rubber aggregate cement mortar, the error is large and the accuracy is very low. Therefore, a method for measuring the interface bond strength of rubber aggregate and hardened cement stone matrix in the utility model can accurately measure and reflect the bond performance of rubber aggregate and cement interface, which is beneficial to the popularization and application of rubber aggregate concrete technology.

Utility model content

The purpose of this utility model is to simulate the real interface bonding environment conditions of rubber aggregate in rubber aggregate concrete, and provide a method for testing the bond strength of rubber aggregate and cement stone interface. This experimental method avoids the traditional method. It can measure the bonding strength simply, quickly and accurately, and can well reflect the bonding performance of the interface between rubber aggregate and cement stone.

The utility model provides a device for measuring the bonding strength of the rubber aggregate and cement interface, which is characterized in that: the frustum-shaped rubber block 1 with the same material as the rubber aggregate in concrete is used, and the large diameter of the frusto-conical rubber block 1 is A pull ring 2 is fixed on the surface, and the tray 4 at the other end is connected through a fixed pulley 3, and a weight 5 is placed on the tray 4.

Apply the method of the present utility model: first process out the conical rubber block 1, require it to be identical with the rubber aggregate material material in the concrete, can smear the interface treatment agent 6 to be measured on the small-diameter bottom surface of the conical rubber block 1, then put The small-diameter bottom surface is aligned with the freshly mixed concrete 7 and buried to a certain depth, and the buried depth should exceed the laitance layer on the upper surface of the cement concrete 7 . When a certain age is reached, another pallet 4 is connected through the fixed pulley 3, and a weight 5 is added to the pallet 4 until the conical rubber block 1 breaks away from the cement concrete 7 matrix, and the tensile force is used to measure the rubber aggregate and cement concrete Collective interfacial bond strength.

The specific test steps are as follows:

1. Process the truncated conical rubber block 1, which is required to be of the same material as the rubber aggregate in the concrete, and fix a pull ring 2 on the large diameter surface of the truncated conical rubber block 1;

2. Polish the small-diameter surface and sides of the truncated conical rubber block 1 with sandpaper, and clean with 1% NaOH solution to remove oil stains on the rubber surface. Apply the interface treatment agent 6 to be tested on the small-diameter surface of the cone-shaped rubber block 1, or do not do any treatment;

3. Embed the small-diameter surface of the processed frustum-shaped rubber block 1 downward into the freshly mixed cement mortar or concrete 7, and the embedding depth should exceed the laitance layer on the upper surface of the cement concrete 7;

4. After reaching the test age, connect the truncated rubber block 1 with the large diameter surface 4 through the fixed pulley 3, add the weight pull ring 2 and the tray 4, and put it on the tray 5 until the truncated rubber block 1 is separated from the cement mortar or concrete 7. Then read out the cumulative quantity of weights 5 in the tray 4, and finally calculate the interface bond strength between the truncated conical rubber block 1 and the cement mortar or concrete 7 matrix.

Description of drawings:

Figure 1 is a schematic diagram of the experimental device for measuring the bond strength of rubber aggregate and cement interface

Wherein 1 is a cone-shaped rubber block, 2 is a pull ring, 3 is a fixed pulley, 4 is a tray, 5 is a weight, 6 is an interface treatment agent, and 7 is cement mortar or concrete.

Detailed ways

In order to test the effect of different rubber interface agents on improving the interface bond strength between cement concrete matrix and rubber aggregates, three different interface treatment agents were selected in the test: titanate coupling agent, styrene-acrylate-organic Silicon coupling agent copolymer, siloxane coupling agent, and combined with the accompanying drawings, follow the steps below to test.

1, make 4 frustum-shaped rubber blocks 1, the diameter of the small-diameter surface is 6cm, and the diameter of the large-diameter surface is 10cm, and the large-diameter surface of the truncated rubber block 1 is fixed with the pull ring 2 with epoxy resin adhesive, Polish the small-diameter surface and side of the truncated conical rubber block 1 with sandpaper, clean the small-diameter surface and the side with 1% NaOH aqueous solution, and apply the above-mentioned three kinds of coupling agents 6 on the small-diameter surfaces of the three truncated conical rubber blocks 1 respectively;

2. Embed one blank frustum-shaped rubber block 1 and three frusto-conical rubber blocks 1 coated with coupling agent 6 into the fresh cement concrete 7 respectively, with an embedding depth of about 1 cm, exceeding the laitance on the surface of the concrete 7 layer.

3. After curing for 3 days, connect the large-diameter surface pull ring 2 and the tray 4 of the truncated conical rubber block 1 through the fixed pulley 3, and put a certain number of weights 5 in the tray 4 until the truncated conical rubber block 1 is pulled out of the cement concrete 7, record different tension data.

4. Calculate the bond strength

The surface area of the small diameter of the frustum-shaped rubber block is S=3.14×32=28.26cm ² , the weight is G0=244g, the pulling force of the coating titanate coupling agent is G=2730g, and the coating styrene-acrylate-organic silicon coupling The tensile force of the agent copolymer is G=3450g, the tensile force of the silicone coupling agent is G=1820g, and the tensile force of the blank test piece is G=1640g.

The formula for calculating the cohesive force is F=G-G0)×g,

Bond strength is $P=\frac{(G-G_0)}{S}\×g$

The test results are shown in Table 1.

Table 1 3-day bond strength of different interface treatment agents

Test group   Different interface treatment agents   Bond strength/Pa 1 blank 4841 2   Titanate coupling agent 8627 3   Styrene-acrylate-silicone coupling agent copolymer   11118 4   Siloxane coupling agent 5465

Claims (1)

1, a kind of device of measuring rubber aggregate and cement interface cohesive strength, it is characterized in that: adopt and the identical truncated cone-shaped block rubber (1) of rubber aggregate material in the concrete, on the major diameter surface of truncated cone-shaped block rubber (1), fix a draw ring (2), by the pallet (4) of fixed pulley (3) the connection other end, on pallet (4), put into counterweight (5).

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