CN111205048A

CN111205048A - Method for manufacturing modeling light-transmitting concrete

Info

Publication number: CN111205048A
Application number: CN202010141240.9A
Authority: CN
Inventors: 朱敏涛; 王宇; 范胜华; 周强; 刘龙
Original assignee: Shanghai Jiangong Construction Material Co Ltd
Current assignee: Shanghai Jiangong Construction Material Co Ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-05-29

Abstract

The invention discloses a method for manufacturing modeling light-transmitting concrete, which comprises the following steps: step 1, customizing a modeling pattern according to the concrete surface to manufacture a modeling template; step 2, installing a steel mould required by concrete pouring; step 3, punching light guide fiber positioning holes which are densely distributed in a dot matrix mode at corresponding positions on the modeling template according to the light-transmitting patterns, penetrating one ends of the light guide fibers into the positioning holes of the modeling template, and coating a release agent on the surface of the modeling template; step 4, fixing the modeling template on a steel mold, fixing the other end of the optical fiber on an optical fiber positioning steel plate, and fixing the optical fiber positioning steel plate on a tool rack; step 5, preparing a cement base and pouring the cement base into the pouring mold in the step 4; and 6, carrying out primary curing on the concrete in a curing room, then demoulding, and carrying out secondary curing after demoulding to obtain the product. The invention can realize different customized modeling of the concrete surface, can accurately position the optical fiber according to the designed light-transmitting pattern, has two functions and saves the manufacturing cost.

Description

Method for manufacturing modeling light-transmitting concrete

Technical Field

The invention belongs to the technical field of precast concrete members, and particularly relates to a manufacturing method of modeling light-transmitting concrete.

Background

The light-transmitting concrete is a brand-new light-transmitting material, and is completely different from the traditional light-transmitting material in various aspects such as material composition, light-transmitting principle, material performance and the like. The material composition is characterized in that: cement base and leaded light material, leaded light material buries in the cement base material base member with certain space arrangement combination mode, forms complicated various leaded light pattern.

The modeling concrete is a novel decorative concrete which is made by utilizing an elastic modeling template or a hard foam modeling template to manufacture the concrete with modeling on the surface, so that the concrete not only keeps the original beauty, but also has rich and diversified modeling expression forms. In the field of precast concrete member manufacturing, the manufacturing of the modeling concrete with the light transmission performance has positive significance. The light-transmitting modeling concrete needs to overcome multiple problems in the manufacturing process, and the most important of the problems comprises the following aspects: (1) the demoulding is difficult; (2) the cohesiveness between the interface of the concrete and the light guide rod is poor; (3) the crack resistance of concrete is poor.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for manufacturing modeling light-transmitting concrete, which has the advantages of wide raw material source, high fluidity, strong binding power, low cost and good crack resistance; the invention has simple demoulding, can integrally form the large light-transmitting concrete plate, and the prepared light-transmitting concrete product with the model reaches the relevant technical indexes, has better durability and simultaneously has good artistic modeling appearance effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a method for manufacturing modeling light-transmitting concrete, which comprises the following steps:

step 1, customizing a modeling pattern according to the concrete surface to manufacture a modeling template;

step 2, installing a steel mould required by concrete pouring;

step 3, punching light guide fiber positioning holes which are densely distributed in a dot matrix mode at corresponding positions on the modeling template according to the light-transmitting patterns, penetrating one end of the light guide fiber, which presents the light-transmitting patterns, into the positioning holes of the modeling template for fixing, and coating a release agent on the surface of the modeling template;

step 4, fixing the modeling template on a steel mold, fixing the other end of the optical fiber on an optical fiber positioning steel plate, and fixing the optical fiber positioning steel plate on an upper tool rack;

step 5, preparing a cement base, and pouring the cement base into the pouring mold formed in the step 4;

and 6, carrying out primary curing on the concrete in a curing room, then demoulding, and carrying out secondary curing after demoulding to obtain the product.

As an embodiment of the present invention, in step S1, an elastic modeling template is used, which is specifically as follows: carving a corresponding customized modeling pattern on the model seed by using a 3D carving machine according to the surface modeling of the concrete; and (3) coating a release agent on the mold seeds, pouring the liquid rubber mold base material on the mold seeds, and demolding after curing to obtain the elastic modeling template.

As an embodiment of the present invention, in step S1, a rigid foam molding template is adopted, which is specifically as follows: and engraving a corresponding customized modeling pattern on the hard foam template by using a 3D engraving machine.

As an embodiment of the present invention, in step S3, the optical fiber and the molding plate are fixed by an adhesive, and in step S4, the molding plate and the steel mold are fixed by an adhesive.

As an embodiment of the present invention, in step S5, the cement base includes the following components in parts by weight: 130 parts of water, 130 parts of Portland cement, 50 parts of fly ash, 4 parts of polycarboxylic acid water reducing agent, 402 parts of medium sand, 402 parts of stone chips, 200 parts of polypropylene long-hard fiber and 10 parts of desulfurized gypsum.

The addition of the desulfurized gypsum enables alkali excitation and sulfate excitation to coexist, promotes the formation of hydrated calcium silicate and hydrated calcium aluminate to generate ettringite, and the hydration products are filled in pores, so that the compactness of a concrete structure is improved, the pore structure is optimized, the strength development is facilitated, and the durability of concrete is improved; according to the invention, the polypropylene long and firm fibers with good water solubility are added, so that the self shrinkage of concrete is effectively reduced, the risk of crack generation of the light-transmitting concrete plate is reduced, and the light-transmitting concrete plate with a larger area can be formed at one time; according to the invention, 50% of fine aggregate is replaced by stone chips and the like, so that the cracking problem of concrete is effectively improved.

As an embodiment of the present invention, in step S5, the cement base includes the following components in parts by weight: 170 parts of water, 361 parts of portland cement, 369 parts of sulphoaluminate cement, 13-18 parts of sulphoaluminate cement, 63-65 parts of fly ash, 6-7 parts of anhydrous sodium sulfate, 2.9 parts of polycarboxylic acid water reducing agent, 1350 parts of medium sand and 6.3 parts of redispersible latex powder, wherein the weight ratio of the sulphoaluminate cement to the anhydrous sodium sulfate is (1.3-2.6) to 1, and the weight ratio of the mixture of the portland cement, the fly ash, the sulphoaluminate cement and the anhydrous sodium sulfate to the redispersible latex powder is 1000: 14.

By adding the sulphoaluminate cement and the anhydrous sodium sulfate, the self shrinkage of the concrete can be effectively reduced, the risk of cracks generated on the light-transmitting concrete plate is reduced, and the light-transmitting concrete plate with a larger area can be formed at one time. By adding the redispersible latex powder, the cracking resistance of the concrete and the adhesive force of the interface of the concrete and the optical fiber are further improved, and the breaking strength of the light-transmitting concrete plate is enhanced.

As a preferred technical scheme, the cement base comprises the following components in parts by weight: 170 parts of water, 364.5 parts of Portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of fly ash, 6.75 parts of anhydrous sodium sulfate, 2.9 parts of polycarboxylic acid water reducing agent, 6.3 parts of redispersible latex powder and 1350 parts of medium sand.

In step S6, as an example of the present invention, the time for the primary curing is 48 hours, the time for the secondary curing is 28 days, and the temperature for the primary curing and the secondary curing is 20 ± 2 ℃.

Compared with the prior art, the invention has the following beneficial effects:

(1) the modeling template used for manufacturing the modeling light-transmitting concrete can realize various different customized modeling of the concrete surface, can accurately position the optical fiber according to the designed light-transmitting pattern, has two purposes by one material, can be detached and reused, and saves the manufacturing cost.

(2) The concrete of the invention has wide raw material source, good working performance, strong binding power, low cost and good crack resistance, can be integrally formed into a large transparent concrete plate, and the prepared transparent concrete reaches related technical indexes and has better durability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a view showing the arrangement of optical fibers when the present invention is cast.

Fig. 2 is a schematic structural view of the casting mold for molding concrete according to the present invention.

Wherein the reference numerals are specified as follows: a molding template (elastic molding template, hard foam molding template) 1, a steel mold 2, an optical fiber positioning steel plate 3 and an optical fiber 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

The embodiment provides a manufacturing method of modeling light-transmitting concrete, which comprises the following steps:

step 1, customizing a modeling pattern according to the concrete surface to manufacture an elastic modeling template 1; the method comprises the following specific steps: carving a corresponding customized modeling pattern on the model seed by using a 3D carving machine according to the surface modeling of the concrete; coating a release agent on the mold seeds, pouring a liquid rubber mold base material on the mold seeds, and demolding after curing to obtain an elastic modeling template 1;

step 2, installing a steel mould 2 required by concrete pouring;

step 3, punching dot-matrix densely-distributed positioning holes of the optical fibers 4 at corresponding positions on the elastic modeling template 1 according to the light-transmitting patterns, inserting one end of the optical fibers 4 presenting the light-transmitting patterns into the positioning holes of the elastic modeling template 1, fixing the optical fibers 4 and the elastic modeling template 1 through an adhesive, and coating a release agent on the surface of the elastic modeling template 1;

step 4, fixing the elastic modeling template 1 on a steel mold 2 through an adhesive, fixing the other end of the optical fiber 4 on an optical fiber positioning steel plate 3, and fixing the optical fiber positioning steel plate 3 on an upper tooling frame;

and 6, carrying out primary curing on the concrete in a curing room, then demoulding, wherein the primary curing time is 48 hours, carrying out secondary curing after demoulding to obtain the product, wherein the secondary curing time is 28 days, and the temperature of the primary curing and the secondary curing is 20 +/-2 ℃.

Example 2

step 1, customizing a modeling pattern according to the concrete surface to manufacture a rigid foam modeling template 1, which comprises the following specific steps: carving a corresponding customized modeling pattern on the hard foam by using a 3D carving machine;

step 2, installing a steel mould 2 required by concrete pouring;

step 3, punching dot-matrix densely-distributed optical fiber 4 positioning holes at corresponding positions on the rigid foam molding template 1 according to the light-transmitting patterns, inserting one end of the optical fiber 4 presenting the light-transmitting patterns into the positioning holes of the rigid foam molding template 1, fixing the optical fiber 4 and the rigid foam molding template 1 through an adhesive, and coating a release agent on the surface of the rigid foam molding template 1;

step 4, fixing the rigid foam molding template 1 on a steel mold 2 through an adhesive, fixing the other end of the optical fiber 4 on an optical fiber positioning steel plate 3, and fixing the optical fiber positioning steel plate 3 on an upper tooling frame;

Through the implementation and the discovery: the elastic modeling template 1 is higher than the rigid foam modeling template 1 in the aspects of optical fiber positioning and modeling customization precision, but the elastic modeling template 1 is complex in manufacturing process, high in raw material price, and better in economy of the rigid foam modeling template 1, and the specific implementation method can be determined according to engineering conditions.

The following describes the production of cement-based cement used in step 5 of examples 1 and 2, by way of examples 3 to 11.

Example 3

The embodiment provides a manufacturing method of a cement base, which comprises the following steps:

weighing 130g of water, 130g of Portland cement, 50g of fly ash, 4g of polycarboxylic acid water reducing agent, 402g of medium sand, 402g of stone chips, 200g of polypropylene long hard fiber and 10g of desulfurized gypsum, and uniformly mixing in a stirrer to obtain the modified calcium sulfate.

Example 4

step 1, weighing 803g of portland cement, 142g of secondary fly ash, 40g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

step 2, putting a certain amount of portland cement, secondary fly ash, sulphoaluminate cement and anhydrous sodium sulfate weighed in the step 1 into a stirrer in sequence, uniformly stirring for 30 seconds, and preparing a composite cementing material;

step 3, weighing 450g of the cementing material, 170g of water, 1350g of standard sand and 2.9g of polycarboxylic acid water reducing agent (the water reducing rate of the water reducing agent is 15%) obtained according to the proportion. The 1d compression and bending tests were carried out by stirring and compacting according to the procedures specified in GB/T17671-1999 (ISO679:1989) Cement mortar Strength test method.

Example 5

step 1, weighing 803g of portland cement, 142g of secondary fly ash, 30g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

step 3, weighing 450g of the cementing material, 170g of water, 1350g of standard sand and 2.9g of polycarboxylic acid water reducing agent (the water reducing rate of the water reducing agent is 15%) obtained according to the proportion. The 1d crush and fracture test was carried out by stirring and compacting according to the procedure specified in GB/T17671-1999 (ISO679:1989) Cement mortar Strength test method.

Example 6

step 1, weighing 803g of portland cement, 142g of secondary fly ash, 20g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Example 7

step 1, weighing 810g of portland cement, 145g of secondary fly ash, 30g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Example 8

step 1, weighing 820g of portland cement, 145g of secondary fly ash, 40g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Example 9

step 1, weighing 820g of portland cement, 145g of secondary fly ash, 30g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Example 10

step 1, weighing 820g of portland cement, 145g of secondary fly ash, 20g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Example 11

step 1, weighing 810g of portland cement, 144g of secondary fly ash, 30g of sulphoaluminate cement, 15g of anhydrous sodium sulfate and 14g of redispersible emulsion powder;

step 2, putting a certain amount of Portland cement, secondary fly ash, sulphoaluminate cement, anhydrous sodium sulfate and redispersible latex powder weighed in the step 1 into a stirrer in sequence, stirring uniformly, and stirring for 30 seconds to obtain a composite cementing material;

Wherein, each component of the cementing material in the 8 embodiments meets the following indexes: the strength grade of the portland cement is 45MPa, the fly ash is F-class II-grade fly ash, the strength grade of the sulphoaluminate cement is 45MPa, and the pH value of the anhydrous sodium sulfate is 6.5. The test results are shown in Table 1.

Table 1: mortar strength obtained by the composite cementing material obtained in each example

Comparative examples

In order to verify the crack resistance of the expanding agents (sulphoaluminate cement and anhydrous sodium sulfate) added in the light-transmitting concrete in the examples 4-11, a 4-group comparison is made, and the concrete implementation is as follows:

comparative example 1

Step 1, weighing 850g of portland cement, 150g of secondary fly ash, 0g of sulphoaluminate cement and 0g of anhydrous sodium sulfate;

Comparative example 2

Step 1, weighing 837g of portland cement, 148g of secondary fly ash, 0g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

Comparative example 3

Step 1, weighing 799g of portland cement, 141g of secondary fly ash, 60g of sulphoaluminate cement and 0g of anhydrous sodium sulfate;

step 3, weighing 450g of the cementing material obtained by the comparative example, 170g of water, 1350g of standard sand and 2.9g of polycarboxylic acid water reducing agent (the water reducing rate of the water reducing agent is 15%). The 1d crush and fracture test was carried out by stirring and compacting according to the procedure specified in GB/T17671-1999 (ISO679:1989) Cement mortar Strength test method.

Comparative example 4

Step 1, weighing 786g of portland cement, 139g of secondary fly ash, 60g of sulphoaluminate cement and 15g of anhydrous sodium sulfate;

The components of the cementing material in the comparative example meet the following indexes: the strength grade of the portland cement is 45MPa, the fly ash is F-class II-grade fly ash, the strength grade of the sulphoaluminate cement is 45MPa, and the pH value of the anhydrous sodium sulfate is 6.5. The 1d compressive strength and the flexural strength of the mortar prepared from the composite cementing material prepared by the comparative test are shown in Table 2.

Table 2: mortar strength of composite cementitious material prepared by each comparative test

Comparative example	1d flexural strength/MPa	1d compressive strength/MPa
			Comparative example 1	4.0	14.9
Comparative example 2	5.2	17.9
			Comparative example 3	4.5	15.0
Comparative example 4	5.1	16.4

From the above test data of examples 4 to 11 and comparative examples 1 to 4, it can be seen that: the addition of the sulphoaluminate cement and the anhydrous sodium sulfate plays a role in micro-expansion, is beneficial to improving the early strength of the concrete, and the addition of the redispersible latex powder can improve the interfacial cohesive force of the concrete, greatly improve the early flexural strength and compressive strength of the concrete, obviously improve the crack resistance of the concrete, improve the crack problem of the concrete and achieve a good apparent effect. Tests prove that the cement-based optimal material comprises the following components: 170 parts of water, 364.5 parts of Portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of fly ash, 6.75 parts of anhydrous sodium sulfate, 2.9 parts of polycarboxylic acid water reducing agent, 6.3 parts of redispersible latex powder and 1350 parts of medium sand.

Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.

Claims

1. The manufacturing method of the modeling light-transmitting concrete is characterized by comprising the following steps of:

step 2, installing a steel mould required by concrete pouring;

2. The method for manufacturing light-transmitting shaped concrete according to claim 1, wherein in step S1, an elastic shaping template is adopted, specifically as follows: carving a corresponding customized modeling pattern on the model seed by using a 3D carving machine according to the surface modeling of the concrete; and (3) coating a release agent on the mold seeds, pouring the liquid rubber mold base material on the mold seeds, and demolding after curing to obtain the elastic modeling template.

3. The method for manufacturing the light-transmitting modeling concrete according to claim 1, wherein in step S1, a rigid foam modeling template is adopted, specifically as follows: and engraving a corresponding customized modeling pattern on the hard foam template by using a 3D engraving machine.

4. The method of claim 1, wherein in step S3, the optical fiber and the molding form are fixed by adhesive, and in step S4, the molding form and the steel mold are fixed by adhesive.

5. The method for manufacturing shaped light-transmitting concrete according to claim 1, wherein in step S5, the cement base comprises the following components in parts by weight: 130 parts of water, 130 parts of Portland cement, 50 parts of fly ash, 4 parts of polycarboxylic acid water reducing agent, 402 parts of medium sand, 402 parts of stone chips, 200 parts of polypropylene long-hard fiber and 10 parts of desulfurized gypsum.

6. The method for manufacturing shaped light-transmitting concrete according to claim 1, wherein in step S5, the cement base comprises the following components in parts by weight: 170 parts of water, 361 parts of portland cement, 369 parts of sulphoaluminate cement, 13-18 parts of sulphoaluminate cement, 63-65 parts of fly ash, 6-7 parts of anhydrous sodium sulfate, 2.9 parts of polycarboxylic acid water reducing agent, 1350 parts of medium sand and 6.3 parts of redispersible latex powder, wherein the weight ratio of the sulphoaluminate cement to the anhydrous sodium sulfate is (1.3-2.6) to 1, and the weight ratio of the mixture of the portland cement, the fly ash, the sulphoaluminate cement and the anhydrous sodium sulfate to the redispersible latex powder is 1000: 14.

7. The method for manufacturing the light-transmitting modeling concrete as claimed in claim 6, wherein the cement base comprises the following components in parts by weight: 170 parts of water, 364.5 parts of Portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of fly ash, 6.75 parts of anhydrous sodium sulfate, 2.9 parts of polycarboxylic acid water reducing agent, 6.3 parts of redispersible latex powder and 1350 parts of medium sand.

8. The method for making a shaped light transmitting concrete according to claim 1, wherein in step S6, the time for the primary curing is 48 hours, the time for the secondary curing is 28 days, and the temperature for the primary curing and the secondary curing is 20 ± 2 ℃.