CN108455897A - A kind of anti-crack concrete additive - Google Patents

Abstract

The invention discloses a kind of anti-crack concrete additives, are made by the raw material of following weight parts：40 50 parts of polycarboxylate water-reducer, 10 15 parts of the resin containing N methyl N benzyl acetamides in 10 20 parts of polypropylene fibre, repetitive unit, 15 18 parts of silane coupling agent；The additive greatly improves the toughness for greatly promoting concrete, to make it have preferable cracking resistance.

Description

A kind of anti-crack concrete additive

Technical field

The present invention relates to construction material, more particularly to a kind of anti-crack concrete additive.

Background technology

Concrete is the general name of the cement base mixing material made by other anticracking materials using concrete as matrix, due to, Anti-crack concrete can be very good to inhibit the development in crack and can improve concrete multiple performance, so anti-crack concrete is to change The effective ways of kind concrete stress performance.But the more concern of people for a long time, the enhancing effect of single concrete, thing Different types of fibrous material is different to the enhancing effect of concrete in reality.Some can improve the preliminary examination cracking degree of concrete Concrete cracking is prevented, degree of participation limits fracture width development after some can improve concrete cracking, some have antiknock Fire resistance property etc. complementary can just mix effect between them by different fibrous materials according to fibrous material theory to generate Answer, can achieve the effect that 1 plus 1 be more than two, to generate dependable performance and with preferable economic and social benefits novel height Performance fibers material.With easily molded, low energy consumption, and durability is good cheap and is combined with steel and can be made into various load-bearing machines The advantages of structure is that the present age most widely used construction material plays a very important role the development of human society.It is mixed at present That there is also toughness is poor for solidifying soil, brittleness is big, dry shrinks big, easy the deficiencies of cracking.

Existing anti-crack concrete Tensile strength is low, and the low shock resistance of flexural strength is poor, therefore we need to carry For a kind of novel anti-crack concrete material, to promote the toughness of concrete.

Invention content

The present invention provides a kind of anti-crack concrete additive, the toughness of concrete is greatly promoted, to make it have preferably Cracking resistance.

To solve the above-mentioned problems, the technical solution adopted by the present invention is such, a kind of anti-crack concrete additive, by The raw material of following weight parts is made：40-50 parts of polycarboxylate water-reducer contains N- first in 10-20 parts of polypropylene fibre, repetitive unit 10-15 parts of the resin of base-N- benzyl acetamides, 15-18 parts of silane coupling agent；

The resin is with one of lower structure：

Preferably, the anti-crack concrete additive is made by the raw material of following weight parts：40 parts of polycarboxylate water-reducer, 12 parts of resin in 15 parts of polypropylene fibre, repetitive unit containing N- methyl-iV-benzyl acetamides, 18 parts of silane coupling agent.

Preferably, the polycarboxylate water-reducer is prepared by lower section method：The aqueous solution of molecular weight regulator is put into In reaction kettle bottom, respectively by N, the mixed aqueous solution of N- dimethacrylates and methoxy polyoxyethylene ether metacrylic acid ester It is added dropwise in reaction kettle with the aqueous solution of polymerization initiator, after completion of dropwise addition, stirs 3-5h, wait for after reaction, being cooled to 40 DEG C hereinafter, with alkaline solution be neutralized to pH to 6-8 to get.

N, the polycarboxylic acids that N- dimethacrylates and methoxy polyoxyethylene ether metacrylic acid ester are prepared is selected to subtract Aqua and the better compatibility of cement better disperse performance, little loss of slump to obtain.

It is further preferred that N, N- dimethacrylate and methoxy polyoxyethylene ether metacrylic acid ester molar ratio are 10：1-5.

Preferably, first in the mixed aqueous solution of N, N- dimethacrylate and methoxy polyoxyethylene ether metacrylic acid ester A concentration of 30-40wt% of base acrylic acid, methoxy polyoxyethylene ether metacrylic acid ester 10-15wt%.

Preferably, a concentration of 4-5wt% of the aqueous solution middle-molecular-weihydroxyethyl conditioning agent of the molecular weight regulator, molecular weight The one kind of conditioning agent in 3- mercaptopropionic acids, thioacetic acid or mercaptoethanol.

Preferably, in the polymerization initiator polymerization initiator a concentration of 5-15wt%, polymerization initiator was selected from Sulfate or benzoyl peroxide.

Preferably, the methoxy polyoxyethylene ether metacrylic acid ester is as shown in I：

Wherein n=20-60.

Advantageous effect：Pass through the resin and silicon containing N- methyl-iV-benzyl acetamides in polypropylene fibre, repetitive unit The addition of alkane coupling agent improves toughness of concrete and impact resistance, improves durability and crack resistance.

Specific implementation mode

In order to deepen the understanding of the present invention, below in conjunction with embodiment and table, the invention will be further described, should Embodiment is only used for explaining the present invention, is not intended to limit the scope of the present invention..

The preparation of 1 poly carboxylic acid series water reducer of embodiment

3- mercaptopropionic acid 40g and 1L water is put into reaction kettle bottom, stirring is warming up to 75 DEG C, respectively by 40wt%N, N- Mixed aqueous solution (N, the N- diformazan of dimethacrylate and 10wt% methoxy polyoxyethylenes ether metacrylic acid ester (n=27) Base acrylic acid is 1mol, and methoxy polyoxyethylene ether metacrylic acid ester is 0.2mol) and polymerization initiator 100ml 5wt% mistakes The aqueous solution of sodium sulphate is added dropwise in reaction kettle, after completion of dropwise addition, stir 3-5h, wait for after reaction, be cooled to 40 DEG C hereinafter, PH to 6-8 is neutralized to get poly carboxylic acid series water reducer I with alkaline solution.

Embodiment 2

3- mercaptopropionic acid 40g and 1L water is put into reaction kettle bottom, stirring is warming up to 75 DEG C, respectively by 40wt%N, N- Mixed aqueous solution (N, the N- dimethyl of dimethacrylate and 5wt% methoxy polyoxyethylenes ether metacrylic acid ester (n=27) Acrylic acid is 1mol, and methoxy polyoxyethylene ether metacrylic acid ester is 0.1mol) and polymerization initiator 100ml 5wt% over cures The aqueous solution of sour sodium is added dropwise in reaction kettle, after completion of dropwise addition, stir 3-5h, wait for after reaction, be cooled to 40 DEG C hereinafter, with Alkaline solution is neutralized to pH to 6-8 to get poly carboxylic acid series water reducer II.

3 anti-crack concrete additive I of embodiment

I 40 parts of poly carboxylic acid series water reducer, 15 parts of polypropylene fibre, structural formula 12 parts of resin as shown in (1) are silane coupled 18 parts of agent.

Wherein n=50-100；

4 anti-crack concrete additive II of embodiment

II 40 parts of poly carboxylic acid series water reducer, 12 parts of the resin of 15 parts of polypropylene fibre, structural formula as shown in (2), silane 18 parts of coupling agent.

Wherein, n=50-100.

Application Example 1

Using reference cement, it is respectively 0.5wt% that anti-crack concrete additive I and II, which consolidates volume, and concrete I and II is made Experimental result is as shown in table 1：

Table 1

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (8)

1. a kind of anti-crack concrete additive, which is characterized in that be made by the raw material of following weight parts：Polycarboxylate water-reducer 40- 50 parts, 10-15 parts of the resin containing N- methyl-iV-benzyl acetamides in 10-20 parts of polypropylene fibre, repetitive unit, silane 15-18 parts of coupling agent；

The resin is with one of lower structure：

Wherein, n=50-100.

2. a kind of anti-crack concrete additive according to claim 1, which is characterized in that by the raw material system of following weight parts ：40 parts of polycarboxylate water-reducer, the resin containing N- methyl-iV-benzyl acetamides in 15 parts of polypropylene fibre, repetitive unit 12 parts, 18 parts of silane coupling agent.

3. a kind of anti-crack concrete additive according to claim 1 or 2, which is characterized in that the polycarboxylic acids diminishing Agent is prepared by lower section method：The aqueous solution of molecular weight regulator is put into reaction kettle bottom, respectively by N, N- dimethyl propylenes The aqueous solution of the mixed aqueous solution and polymerization initiator of olefin(e) acid and methoxy polyoxyethylene ether metacrylic acid ester is added dropwise to reaction In kettle, after completion of dropwise addition, 3-5h is stirred, waits for after reaction, being cooled to 40 DEG C hereinafter, be neutralized to pH to 6-8 with alkaline solution, To obtain the final product.

4. a kind of rust-proof type poly carboxylic acid series water reducer according to claim 3, which is characterized in that N, N- dimethacrylate It is 10 with methoxy polyoxyethylene ether metacrylic acid ester molar ratio：1-5.

5. a kind of rust-proof type poly carboxylic acid series water reducer according to claim 3, which is characterized in that N, N- dimethacrylate With a concentration of 30-40wt% of methacrylic acid in the mixed aqueous solution of methoxy polyoxyethylene ether metacrylic acid ester, methoxy Base polyethenoxy ether metacrylic acid ester 10-15wt%.

6. a kind of rust-proof type poly carboxylic acid series water reducer according to claim 3, which is characterized in that the molecular-weight adjusting A concentration of 4-5wt% of the aqueous solution middle-molecular-weihydroxyethyl conditioning agent of agent, molecular-weight adjusting are selected from 3- mercaptopropionic acids, thioacetic acid or mercapto One kind in base ethyl alcohol.

7. a kind of rust-proof type poly carboxylic acid series water reducer according to claim 3, which is characterized in that the polymerization initiator A concentration of 5-15wt% of middle polymerization initiator, polymerization initiator are selected from persulfate or benzoyl peroxide.

8. a kind of rust-proof type poly carboxylic acid series water reducer according to claim 3, which is characterized in that the methoxyl group polyoxy second Alkene ether metacrylic acid ester is as shown in I：

Wherein n=20-60.