Self-repairing cement concrete pavement expansion joint sealing material

Abstract

The invention discloses a joint sealing material for self-repairing cement concrete pavement expansion joints. The joint sealing material is prepared from the following raw materials in parts by weight: 15-20 parts of silane modified polyether resin (MS resin), 7-15 parts of silane modified polyurethane resin, 1-2 parts of butyl titanate, 8.5-15.5 parts of a plasticizer, 40-55 parts of filler, 0.3-0.5 part of a coupling agent, 0.1-0.2 part of a catalyst, 1-2 parts of a water removal agent and 8-12 parts of a self-repairing factor. The joint sealing material has a certain degree of self-healing ability, can greatly prolong the service life, improves the waterproof effect, and is good in flowability and easy to construct.

Description

Technical Field

[0001] The invention relates to the field of cement concrete pavement joint fillers, in particular to a self-repairing cement concrete pavement expansion joint filler, and also relates to a preparation method thereof. Background Art

[0002] With the rapid development of the national economy, the mileage of highway construction and traffic is increasing, and the requirements for road construction and maintenance quality are getting higher and higher. Highway pavements are divided into black and white types. Black pavements are mainly made of asphalt mixtures, and white pavements are generally made of cement concrete. Although white pavements have a longer service life and lower maintenance costs, they also have disadvantages such as high cost, poor driving comfort, and difficult maintenance and construction. Therefore, cement concrete pavements are less and less used on grade roads. However, white cement concrete pavements are still relatively common for highway toll plazas, service area plazas, mountain roads with large longitudinal slopes, or low-grade roads with a lack of full-time maintenance personnel. During the use of white cement concrete pavements, the most common diseases are fractures, falling corners, broken edges, crushing, and crushing and subsidence. The main causes of these diseases are found to be water damage. The main source of water damage is the gaps in the concrete pavement panels, which are mainly cut during the construction process. Therefore, in order to avoid or minimize these water damages, it is particularly important to study the sealing of the cuts in long-life cement concrete pavements. Summary of the invention

[0003] The purpose of the present invention is to provide a self-repairing cement concrete pavement expansion joint filler, which not only has a certain crack self-healing ability, greatly extending the service life, but also improves the permeability while solving the defect that the self-repairing factor is easy to settle after softening.

[0004] To achieve the above object, the present invention provides a self-repairing cement concrete pavement expansion joint filler, which is composed of the following raw materials in parts by weight:

[0005] Silane modified polyether resin (MS resin) 15-20, silane modified polyurethane resin 7-15, butyl titanate 1-2, plasticizer 8.5-15.5, filler 40-55, coupling agent 0.3-0.5, catalyst 0.1-0.2, dehydrating agent 1-2, self-repairing factor 8-12.

[0006] Further, the MS resin is a dimethoxy-terminated silane-modified polyether resin with a viscosity of 9000 to 12000 mPa.s. The silane-modified polyurethane resin is preferably SK-800F resin produced by Skoray New Materials Technology Co., Ltd. The dimethoxy-terminated silane-modified polyether resin is preferably S3430E model produced by Asahi Whistle AGC of Japan.

[0007] Furthermore, the plasticizer is one of polypropylene glycol (PPG), diisopropyl phthalate (DOP), and diisononyl phthalate (DINP).

[0008] Furthermore, the filler is heavy calcium carbonate and nano calcium carbonate and is added in a ratio of 2:3.

[0009] Furthermore, the coupling agent is one or both of γ-aminopropyltriethoxysilane and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0010] Furthermore, the catalyst is one or both of dibutyltin dilaurate and dibutyltin diacetate.

[0011] Furthermore, the dehydrating agent is vinyl trimethylethoxysilane.

[0012] Furthermore, the self-repairing factor is polycaprolactone particles.

[0013] The preparation method of the above-mentioned self-repairing cement concrete pavement expansion joint filler comprises the following steps:

[0014] Disperse the plasticizer and filler in a planetary mixer at room temperature and pressure at half the formula amount, with a rotation speed of 400-600rpm and dispersion for 10-20min. After dispersion, add silane-modified polyurethane resin, half of the formula amount of MS resin, half of the formula amount of dewatering agent and the other half of the formula amount of filler, and disperse at a rotation speed of 500-800rpm for 50-80min at room temperature and pressure; then, add coupling agent, catalyst, butyl titanate, self-repairing factor, the other half of the formula amount of MS resin, and the other half of the formula amount of dewatering agent, set the temperature to 60-65℃, the vacuum degree to -0.08-0.095Mpa, the rotation speed to 500-800rpm, and stir for 50-80min to obtain self-repairing cement concrete pavement expansion joint filler.

[0015] The self-repairing cement concrete pavement expansion joint filler prepared by the present invention has a certain self-repairing ability for cracks, greatly prolongs the service life of the filler, and cooperates with silane-modified polyurethane resin and MS resin to solve the problem that the self-repairing factor is not easy to disperse and the sinking problem caused after softening.

[0016] The self-repairing cement concrete pavement expansion joint filler prepared by the present invention has a large contact area with the concrete substrate, strong bonding force, excellent waterproof effect, wear resistance, elasticity and fluidity. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Table 1 shows the mass content of each component in Examples 1 to 4 and Comparative Examples 1 and 2.

[0019] Table 1

[0020]

[0021]

[0022] In the above embodiments 1-4 and comparative examples 1 and 2, the MS resin is the S3430E model of Japan Asahi Whistle AGC. The silane-modified polyurethane resin is preferably the SK-800F resin of Skoray New Materials Technology Co., Ltd., the plasticizer is phthalate (DOP), the coupling agent is γ-aminopropyltriethoxysilane, the catalyst is dibutyltin dilaurate, the dehydrating agent is vinyltrimethylethoxysilane, and the self-repairing factor is polycaprolactone particles.

[0023] In the above-mentioned embodiments 1-4 and comparative examples 1 and 2, the preparation method of the self-repairing cement concrete pavement expansion joint filler is as follows:

[0024] Disperse the plasticizer and filler in a planetary mixer at room temperature and pressure at half the formula amount, with a rotation speed of 400-600rpm and dispersion for 10-20min. After dispersion, add silane-modified polyurethane resin, half of the formula amount of MS resin, half of the formula amount of dewatering agent and the other half of the formula amount of filler, and disperse at a rotation speed of 500-800rpm for 50-80min at room temperature and pressure; then, add coupling agent, catalyst, butyl titanate, self-repairing factor, the other half of the formula amount of MS resin, and the other half of the formula amount of dewatering agent, set the temperature to 60-65℃, the vacuum degree to -0.08-0.095Mpa, the rotation speed to 500-800rpm, and stir for 50-80min to obtain self-repairing cement concrete pavement expansion joint filler.

[0025] Table 2 shows the performance test results of the self-repairing cement concrete pavement expansion joint filler of the present invention.

[0026] Table 2

[0027]

[0028]

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-repairing cement concrete pavement expansion joint filler, characterized in that: The described joint filling material is composed of the following raw materials in parts by weight: Silane modified polyether resin (MS resin) 15-20, silane modified polyurethane resin 7-15, butyl titanate 1-2, plasticizer 8.5-15.5, filler 40-55, coupling agent 0.3-0.5, catalyst 0.1-0.2, dehydrating agent 1-2, self-repairing factor 8-12.

2. A self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The MS resin is a dimethoxy-terminated silane-modified polyether resin with a viscosity of 9000-12000 mPa.s.

3. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The plasticizer is one of polypropylene glycol (PPG), diisopropyl phthalate (DOP) and diisononyl phthalate (DINP).

4. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The filler is heavy calcium carbonate and nano calcium carbonate, which are added in a weight ratio of 2:

3.

5. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The coupling agent is one or two of gamma-aminopropyltriethoxysilane and N-(β-aminoethyl)-gamma-aminopropyltrimethoxysilane.

6. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The catalyst is one or both of dibutyltin dilaurate and dibutyltin diacetate.

7. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The dewatering agent is vinyl trimethylethoxysilane.

8. The self-repairing cement concrete pavement expansion joint filler according to claim 1, characterized in that: The self-repairing factor is polycaprolactone particles.

9. A method for preparing a self-repairing cement concrete pavement expansion joint filler according to any one of claims 1 to 8, characterized in that: The following steps are involved: Disperse the plasticizer and filler in a planetary mixer at room temperature and pressure at half the formula amount, with a rotation speed of 400-600rpm and dispersion for 10-20min. After dispersion, add silane-modified polyurethane resin, half of the formula amount of MS resin, half of the formula amount of dewatering agent and the other half of the formula amount of filler, and disperse at a rotation speed of 500-800rpm for 50-80min at room temperature and pressure; then, add coupling agent, catalyst, butyl titanate, self-repairing factor, the other half of the formula amount of MS resin, and the other half of the formula amount of dewatering agent, set the temperature to 60-65℃, the vacuum degree to -0.08-0.095Mpa, the rotation speed to 500-800rpm, and stir for 50-80min to obtain self-repairing cement concrete pavement expansion joint filler.

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