JPS593064A - Cement member reinforcing material - 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 reinforcing material for cement parts.

More specifically, the present invention relates to a reinforcing material that has good adhesion to cement members and improves the strength and durability of the cement members.

In general, cement members made of cement mortar and concrete are weak against external tensile forces and have a brittle defect in that they have a small tolerance until fracture. To improve this,
Glass fiber-reinforced concrete with increased ultimate breaking strength by uniformly mixing glass fiber into the cement part and reducing tensile cracks! So-called GRC is used in various fields due to its light weight and high strength properties.

However, if commonly used glass fibers are mixed into cement members, they will deteriorate due to the strong alkali liberated from the cement, making it impossible to impart sufficient durability to the cement members.

To this end, various types of glass fibers with improved alkali resistance have been developed and are currently being used as reinforcing materials for cement cement. However, all of these alkali-resistant glass fibers are expensive, and many of them are difficult to manufacture.

The inventors of the present invention have conducted extensive research in view of the current situation, and have found the following results:
Even though E-glass fiber cannot normally be used as a reinforcing material for cement members due to insufficient alkali resistance, it can be made by coating its surface with a hardened layer of unsaturated polyester resin and/or vinyl ester resin. The present inventors have discovered that the adhesion properties and alkali resistance of the glass fibers to cement materials are dramatically improved, and that excellent strength and durability can be imparted to cement systems, leading to the completion of the present invention.

That is, the present invention has a diameter of 0.01 to 2 and a length of 5 to 10.
This is a complementary cement member in which the surface of 0 mm glass fiber is coated with a hardened layer of unsaturated polyester resin and/or vinyl ester resin.

The cement member used in the present invention includes a commonly used matrix such as Portland cement, fillers such as silica sand, river sand, and crushed stone; reinforcing materials such as cherry fiber and inorganic fiber; and other modifications, as required. It is possible to use one to which a quality agent or the like is added.

Unsaturated polyester used in the present invention'$1
Jltj' is obtained by dissolving an unsaturated polyester obtained by condensing a glycol component with an acid component consisting of an unsaturated dicarboxylic acid and, if necessary, a saturated dicarboxylic acid, into a polymerizable monomer.

As the unsaturated polyester, polyesters whose terminal functional groups have been modified with monohydric alcohols, monohydric carboxylic acids, epoxy group-containing compounds, isocyanate compounds, etc. can also be used.

Vinyl ester resin is made by dissolving epoxy ester, which is obtained by reacting an epoxy resin with an unsaturated basic acid, in a polymerizable monomer. Gamma treated vinyl ester resins are also used.

In the present invention, an unsaturated polyester resin and a vinyl ester resin can be used alone or in a mixture in any proportion as resin components for coating the surface of glass fibers.

Among these, when a resin component with a heat distortion temperature of 60°C or higher when made into a cured product is used, it has a great effect of protecting glass fibers from alkali released from cement, and has particularly good strength and durability. can be obtained.

If other thermosetting resins, such as epoxy resins, are used in place of the unsaturated polyester resin and/or vinyl ester resin used in the present invention, the curing speed during formation of the cured film may be affected, and the difference between the glass fiber and the cured film may be affected. The adhesion of the reinforcing material, the alkali resistance of the obtained reinforcing material, etc., and the reinforcing properties of the present invention are also inferior.

Also, the reinforced fabric of the present invention is more advantageous in terms of cost.

The glass fibers that can be used in the present invention include those that are normally used as reinforcing materials for plastics, such as glass filaments with a diameter of several microns to several tens of microns, strands made of many bundled filaments, and many strands. Bundled roving etc. can be used. As the composition of the glass fiber, it is possible to use so-called E-glass, which is widely used in ordinary applications.

Difficulties in the glass fiber binding process can be easily identified and eliminated.

For example, the reinforcing material for the cement part of "Honmarari" is made by impregnating a continuous lohyng with unsaturated polyester resin and/or vinyl ester resin to which a curing catalyst and necessary curing accelerator have been added. It can be easily obtained by removing excess resin, curing with heat or at room temperature so that the weight is in the range of 0.01 to 2w++, and then cutting it into lengths of 5 to 100 cm.

The present invention is not limited to this method of coating the surface of glass fiber with a hardened layer of resin.

The reinforcing material for cement members of the present invention has a length of 51+l.
If the length is shorter than I++, a sufficient reinforcing effect cannot be obtained, so it is not preferable. On the other hand, if the length exceeds 100111111, it is preferable because it will easily break when mixed into a cement component, and the reinforcing material will tend to be oriented in one direction when pouring a cement component containing such a long reinforcing material into a mold. do not have.

Thin ones with a diameter of less than 1 mm LO tend to break when mixed with the cement member, and conversely, those with a diameter of more than 2 mm are less effective in preventing cracks in the cement member, both of which are undesirable.

The amount of reinforcing material for cement members of the present invention used is within the range of 0.5 to IQO parts by weight, preferably 1 to 50 parts by weight, per 10.0 parts by weight of the cement member. s
If the turtle i is less than 8 parts, a sufficient reinforcing effect cannot be obtained;
Even if the amount of addition exceeds 1 part, the reinforcing effect cannot be expected to increase as the amount of addition increases, and both are not suitable.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Note that parts in the examples indicate parts by weight.

Example 1 0 parts of cobalt octenoate added to 100 parts of unsaturated polyester resin (Nippon Shokubai Kagaku Kogyo Co., Ltd. 1 EPOLAC C-105")
．． E glass roving ("R-240" F, manufactured by Nittobo Co., Ltd.) is soaked in a resin component containing 1 part of methyl ethyl ketone peroxide and 0.5 part of methyl ethyl ketone peroxide, and after sufficiently impregnated with the resin component, it is pulled up and cured at room temperature. , this is about 30m long
Reinforcement material for cement parts (hereinafter referred to as reinforcement material (I))
It is called. ) was obtained. The diameter was approximately 1 mm. Next, 100 parts of Portland cement, 1 part of reinforcing material (I),
A mixture of 60 parts of silica sand and 30 parts of water was cured in a mold, taken out, and left at 18°C for 28 days before impact strength (J
IS A 1306-6) was measured and found to be 14
．． oK9@17cm2. Also, 2 at 18℃
After being left for 8 days and subsequently exposed outdoors for 90 days, the impact strength was 13.2 Kg·f10n2, and the decrease in strength was small.

Example 2 The unsaturated polyester resin used in Example 1 was replaced with vinyl ester resin (“Eporak RF-” manufactured by Nippon Shokubai Chemical Co., Ltd.
As a result of conducting an experiment in the same manner as in Example 1 except that the impact strength was changed to 1001''), the impact strength after 28 days was 14.5 Kp・f/a.
X, impact strength after continued outdoor exposure for 90 days is 14.
It was 3Kg @ f 7cm2, and the decrease in strength was small and rare.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the reinforcing material (I) used in Example 1 was changed to E glass roving (manufactured by Nittobo Co., Ltd. @R-240F") cut into 30 mm. The result of a funny experience＼
The impact strength after 28 days was 5.8 Kg@f/cIn2, and the impact strength after 90 days of outdoor exposure was 2 e 7 K.
ge f /crn2.

Claims (1)

[Claims] 1. Diameter 0. A reinforcing material for cement members, the surface of glass fibers having a diameter of 01 to 2 and a length of 5 to 100 being coated with a hardened layer of unsaturated polyester resin and/or vinyl ester resin.