JPS58195605A - Construction of precast flat plate by polymer mortar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laying perforated precast flat plates using polymer mortar as an adhesive.

In the present invention, polymer mortar (synonymous with resin mortar) is a general term for composite materials in which fine aggregate is bonded with resin.

Most road pavements in Japan are made of asphalt or cement concrete, but asphalt is subject to severe abrasion, especially in cold regions due to spiked tires, which increases repair costs and is prone to abrasion dust. It is also a social problem because it pollutes the air. Cement concrete is more durable than asphalt, but it requires a long curing period after construction, and traffic obstruction during that time poses problems, making it difficult to implement. Therefore, repair work using early-strength cement mortar has been carried out in recent years, but it is inferior to cement concrete in terms of wear resistance and i-layer properties with the base.

In order to solve the above-mentioned problems, the present invention proposes a paving method for quickly laying concrete or polymer concrete precast flat plates with excellent wear resistance. That is, 12 to 20% by weight of a resin liquid made of an ethylenically unsaturated monomer containing glycerol methacrylate at lθ weight i% or more is used as a binder, and this is mixed with aggregate to obtain fluidity and hardening properties. This is a method of gluing and laying perforated precast flat plates using a polymer mortar rich in carbon dioxide. By applying this construction method to newly constructed or old roads with advanced wear, it is possible to obtain pavement in a short period of time that not only has high resistance to scraping but also has excellent adhesion to the base and waterproof properties. .

There are epoxy, polyurethane, unsaturated polyester resin mortars, etc., but all of them have high resin viscosity, and as shown in Table 1, the resin content is required to obtain a polymer mortar with good fluidity similar to that used in the present invention. 25 weight t
% or more, the cost is quite high, and it is difficult to rapidly cure and develop the required strength in actual use at temperatures below freezing. In comparison, the resin used in the present invention is a mixed resin liquid of glycerol methacrylate and other ethylenically unsaturated monomers, and the viscosity of the resin is small, and the resin content is 12 to 20% by weight. 180~
A well-flowing polymer mortar with a p-value of 250+ mn can be obtained and, furthermore, below freezing.

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Since it can exhibit high strength over lu, it enables the rapid construction method of the present invention.

Other ethylenically unsaturated monomers used in the present invention include acrylic acid, acrylic l-v esters, methacrylic acid, methacrylic esters, styrene-cooled styrene,
α-methylstyrene, vinyltoluene, vinyl acetate,
Divinylbenzene, butadiene, etc. are available, but styrene methyl methacrylate is preferred in terms of reactivity and cost.

The glycerol methacrylate used in the present invention is a methacrylic beak ester of glycerin, and any of mono-, di-, and triester can be used, but in particular, the di- and triesters account for 70 to 90% by weight. It is preferable to use a mixture of polyfunctional resin compositions, and a mixed resin solution in which glycerol methacrylate having such a composition is blended with other ethylenically unsaturated monomers at a higher 1O weight ratio has high reactivity and excellent properties. It is desirable to obtain a polymer mortar with good physical properties.

The polymer mortar used in the present invention contains aggregates such as silica sand, gravel, crushed stone, carbonate, lucium, clay, talc, aluminum hydroxide, aluminum oxide, Portland cement, etc. 74, f14fya, 7. etc. are used together.

1. For the method of curing the polymer mortar used in the present invention, please refer to 1. :( Although not restricted by this, it is practical to cure using an appropriate radical initiator.

As a radical initiator, cumene hydroperoxide,
Methyl ethyl ketone peroxide, l,1-di-t-butylperoxy-3,3,5-)limethylcyclohexane, dicumyl peroxide, di-t-butyl peroxide, benzoyl peroxide, t-butyl peroxybenzoate, etc. Usual radical polymerization reactions of initiators are used. Its usage ranges from 1 to 5 PHR to resin.

In addition, amine-based curing accelerators such as dimethylaniline, diethylaniline, and dimethylparatoluidine (
Table compounds, +1 & acid metal salts such as cobalt naphthenate, manganese octylate, etc. are used in a range of 0.5 to 5P). Further, for the purpose of increasing the curing time by +40, 0.01 to 0.05 PHR of parabenzoquinone, para-t-butylcatechol, etc. can be used as a retarder.

Next, the construction method of the present invention will be explained.

Precast slabs made of concrete or polymer concrete with dimensions that match the conditions of the area where the paving will be carried out are manufactured in advance at a factory, but the design in this case is such that the slabs and mortar can be perfectly bonded as shown in Figure 5. Tapered holes with a diameter of 30 m/m are made at intervals of 1 point per 0.1 to enable confirmation of the installation. Install the nut in place.

At 5th, the manufactured concrete or polymer concrete precast slabs are delivered to the site using a Unique truck. One-knee resistance at construction site・″″′−′−
We clean the mounting surface, measure the outside air temperature, the temperature of the installation surface, and the temperature of the aggregate and resin, and then design the formulation to obtain the optimal fluid polymer mortar that matches the required working time and curing time. Then, the aggregate, resin, curing agent, accelerator, retardant, etc. mentioned above are weighed and mixed in a mixer.

Thermoplastic resin may be dissolved in three to five layers in the resin liquid in order to reduce residual stress due to curing shrinkage. As the thermoplastic resin, polystyrene, polymethyl methacrylate, saturated polyester, etc. can be used. Immediately pour the kneaded polymer mortar evenly onto the installation surface as shown in Figure IK, then hang concrete or a light polymer concrete plate onto the concrete or polymer concrete light plate using a crane by hooking it with a wire and gluing it down as shown in Figure 2. Lay down. At this time, as shown in Figures 5 and 6, the hook and the level spacer serve as both, so by removing the wire and rotating the hook, the flat plate is lowered by its own weight, and the level can be easily adjusted. As the plate descends,
The polymer mortar begins to flow, and the air left in between is ejected from each hole along with the excess mortar, making it possible to achieve more complete adhesion. Therefore, it is necessary to take into account the amount of mortar that will eject and enter the hole when calculating the amount of mortar that is initially poured.

When the mortar has semi-hardened and stopped flowing, remove the hooks, remove the excess mortar that spewed out from each hole as shown in Figure 3, fill the holes after the hooks have been removed with mortar, and carry out the laying work as shown in Figure 4. Complete. Although the size and number of holes in the flat plate are not specified, it is desirable that the strength of the flat plate be maintained sufficiently and air entrainment and defoaming can be performed satisfactorily as the mortar flows.

Example 1 This is an example of repair work in which a precast flat plate was overlaid on a concrete road that had undergone significant wear using polymer mortar as an adhesive. As the site is a narrow bridge with heavy traffic, there is limited space for vehicles to pass, and as shown in Figure 7, only the contact surface of the car's tires was severely worn, resulting in ruts and dents of 35 to 40 m/m in depth. It was done.

As shown in Figure 8, the repair work consisted of laying two perforated precast flat plates 1.100 m wide, 2000 m long, and 40 m thick perforated in the worn area with a width of 3.75 m on one side.

The construction work was carried out according to the following steps.

After the traffic connection was completed, the construction site was cleaned, and in order to prevent mortar from flowing out, electricity was installed on both sides of the flat plate installation surface, and the mortar was poured into it. To mix the mortar, use a 100-sized forced stirring mixer, add sand and calcium carbonate aggregate, then add a resin solution containing a hardener, accelerator, and retarder, and mix for 2 to 3 minutes. . This formulation design was carried out using the formulations shown in Table 2 so that the pot life was 60 minutes and the curing time was 120 minutes. As shown in the table, these mortars have high bending strength and adhesive strength with concrete, and are excellent in waterproofing properties. After pouring the mortar onto the installation surface and leveling it out using its self-leveling property, slowly lower the precast flat plate with holes on top of it, adjust the level by turning the level spacer bolts, and then sink the flat plate further to level the holes. Check that mortar is gushing out.

After about an hour of laying the clay in this way, when the pot life of the mortar has passed and it has become semi-hardened, the hooks are removed, the holes in the hooks are filled with mortar, and the excess mortar that spews out is removed. ``7Sphalt was applied to the steps between the flat plates to make the entire road surface smooth. Vehicle traffic resumed approximately three hours after the final mortar was laid and the stone was laid.

Approximately one month later, we conducted a survey of the construction site and found that 1. It was confirmed that there was no separation or cracking, and that the mortar and flat plate were in good contact. Regarding the wear of the flat plates, the polymer concrete flat plates showed almost no wear, while the concrete flat plates showed some wear on the surface layer, but the degree of wear was relatively small compared to asphalt pavement.

Table 4 shows the results of measuring the wear depth of specimens made of the same material as those used in the examples using a spiked tire running tester, and the results show that concrete and polymer concrete have a depth of 2 to 30% compared to asphalt. It can be seen that the wear resistance is four times higher.

Example 2 A perforated precast slab made of polymer concrete was overlaid on a damaged road line in a factory site using a polymer mortar having a resin composition and an aggregate composition as shown in Table 3. The polymer mortar developed the required strength in 2 to 3 hours. Upon impact with a hammer, the base concrete was destroyed, confirming that the precast board, polymer mortar, and base concrete were well bonded. Approximately three months later, we conducted a survey of the construction site and found that there was no peeling or cracking of the precast plates, and there was very little surface wear. □
'□As is clear from the above examples, Hirumei minimizes traffic stoppage time due to construction, has excellent wear resistance,
This provides a method for rapidly constructing waterproof and high-strength pavement on-site, and is expected to contribute to the reduction of road wear caused by vehicles equipped with spiked tires in cold regions and the prevention of air pollution caused by wear dust. It is something to do.

Table 1 Properties of polymer mortar *Flow value is 20~2400 X.

Table 2 Practical formulation examples of polymer mortar Table 3 Practical formulation examples of polymer mortar Table 4 Depth of wear measured by spiked tire running type abrasion tester

[Brief explanation of drawings]

Fig. 1 Polymer mortar pouring Fig. 2 Lifting of the flat plate Fig. 3 Adherence due to lowering of the plate Fig. 4 When construction is completed Fig. 5 Details of the holes in the plate and bolts Fig. 6 Rotating the bolts and leveling When completed Figure 7 Condition of the road surface before installation in Example 1 Figure 8 Details of installation in Example 1 (1) To I: I leakage prevention top (2) Precast perforated flat plate (3) Level that can also be used as a hanging bracket Spacer bolts (4) Tapered holes with 30 straight holes (5) Splashed polymer mortar (6) Completed level by rotating the bolts (7) M-concrete pavement (8) Bridge deck concrete (9) Precautions (10) Asphalt flat plate (10) Installation location However) Polymer metal rutal ((・':1 Patent applicant Horacon Co., Ltd. President and CEO Akira Haga Attorney Patent attorney Takeharu Ueno Figure 4 (also) Figure 7 Figure 8 Continuation of page 1 0 Author Atsushi Kasahara Hokkaido Institute of Technology, 419-2 Teinemaeda, Nishi-ku, Sapporo Applicant Nippon Oil & Fats Co., Ltd. 1-10-1 Yurakucho, Chiyoda-ku, Tokyo Applicant: Hiranoki Hokkaido Industrial Research Institute, Kita 19-jo, Nishi 11-chome, 1, Kita-ku, Sapporo City, Hokkaido Industrial Research Institute, 1939 & February 12, 2013 Japan Patent Office - Display of 1 case Showa 5, 2003 Patent Application No. 57153 Relationship with applicant 5, date of amendment order 6, number of inventions increased by amendment (to

Claims (1)

[Claims] A fluid polymer mortar with a mixing ratio of 12:88 to 20:80 of ethylenically unsaturated monomer resin liquid containing glycerol methacrylate or more and aggregate of 12:88 to 20:80 is poured onto the concrete pavement surface, and then A rapid paving method for laying precast flat plates using polymer mortar, which is characterized by lowering a perforated precast flat plate into the ground and installing it tightly using only its own weight.