CN111423161A

CN111423161A - Steam curing-free process for cement product

Info

Publication number: CN111423161A
Application number: CN202010227197.8A
Authority: CN
Inventors: 肖煜; 唐雪峰
Original assignee: Guangdong Xinlong Concrete Pipe Co ltd
Current assignee: Guangdong Xinlong Concrete Pipe Co ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2020-07-17
Anticipated expiration: 2040-03-27
Also published as: CN111423161B

Abstract

The invention discloses a cement product steam curing-free process, which belongs to the technical field of cement products, and mainly comprises the steps of slurry preparation, preparation of a mold with a steam curing-free net, pouring and demolding to obtain a cement product and the steam curing-free net self-heating to realize the self-curing, wherein the steam curing-free net can be used, in the process of slurry pouring, part of self-heating balls on the steam curing-free net can be cracked under the impact friction of slurry, so that self-heating liquid overflows and reacts with quicklime particles, for the other part of non-cracked self-heating balls, a liquid guide cotton rod in the self-heating balls can conduct the self-heating liquid into the quicklime particles to react with the quicklime particles, further generate heat to realize the self-curing of the cement product, thereby reducing the step of steam curing the cement product in the prior art and effectively improving the preparation efficiency of the cement product, and simultaneously, the cost investment in the production of the cement product is effectively reduced.

Description

Steam curing-free process for cement product

Technical Field

The invention relates to the technical field of cement products, in particular to a steam-curing-free process for a cement product.

Background

A powdered hydraulic inorganic cementitious material. Water is added and stirred to form slurry which can be hardened in air or water and can firmly bond sand, stone and other materials together. The cement products are most commonly concrete products, and the concrete performance is mainly determined by factors such as concrete components, concrete preparation, concrete curing and the like. Under the condition of certain raw materials, mixing ratio and construction process, the curing of the concrete, particularly the control of an early curing mode, curing temperature, curing humidity, curing time and the like, has important influence on the hydration hardening degree, strength development, durability and the like of the concrete.

The reaction temperature of concrete is increased by steaming the concrete, and in the initial stage of heating, the steam is mainly transferred to the concrete by means of the condensation heat release of the steam on the concrete, and the convection heat release effect is secondary.

Curing temperatures have a large impact on the rate of development of early properties of concrete. Generally, the higher the curing temperature, the faster the strength develops. Research shows that when the temperature is lower than a certain limit value, the cement hydration reaction can not be carried out any more, the concrete strength stops developing, and the temperature is about-10 ℃. In fact, at temperatures below 0 ℃, the moisture in the concrete already starts to freeze, which will lead to freezing damage of the concrete. Meanwhile, the environment where the early concrete is located does not maintain sufficient humidity, which may cause a great amount of moisture in the concrete to evaporate, and the consequence is that: on one hand, the continuous hydration of cement is influenced due to drying and dehydration; on the other hand, the drying shrinkage of the concrete is increased, so that the concrete bears the tensile stress caused by shrinkage in a low-strength state, and the early cracks of the concrete are caused. Therefore, in the areas with large day-night temperature difference and low temperature below zero, more steam curing is selected to ensure the requirements of the concrete on the temperature and the humidity in the early curing process, so that the strength and various performances of the concrete can be ensured.

In winter, concrete curing is generally performed in a low-temperature environment in the north by using coal-fired steam, in the south by using a wet and cold area by using modes of heating by using normal-pressure water, storing heat by using small coal furnaces and the like, along with increasing haze, the whole society has high attention to PM2.5, and harmful gases such as carbon dioxide, sulfur dioxide, nitrogen oxides, carbon monoxide and the like and PM2.5 are generated in the modes of coal-fired steam curing commonly used in the north and small coal furnace heat storage curing commonly used in the south. The coal-fired steam heat storage mode cannot be accepted by the whole society, the hydropower energy in China is relatively abundant, and the pollution cannot be generated, so the mode of generating steam by electric heating has good social benefit although the cost is slightly higher and the economic benefit is slightly poor.

However, the cement curing process is a relatively long process, which may cause a high production cost for the whole cement product, and the curing process mainly depends on the heat released by the condensation of steam on the concrete to transfer steam to the concrete, which may affect the production efficiency of the whole cement product.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a cement product steaming-free process, which can realize the situation that part of self-heating balls on the steaming-free net can break under the impact friction of mud in the process of mud pouring through the use of the steaming-free net, so that self-heating liquid overflows and reacts with quicklime particles, and for the other part of non-broken self-heating balls, a liquid guide cotton rod in the self-heating balls can conduct the self-heating liquid into the quicklime particles to react with the quicklime particles, so as to generate heat, thereby realizing the self-steaming of the cement product, reducing the step of carrying out steam curing on the cement product in the prior art, effectively improving the preparation efficiency of the cement product, and simultaneously effectively reducing the cost investment in the production of the cement product.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

The non-steam curing process for cement product includes the following steps:

s1, mixing cement, sand, pebbles, water and additives in a proper proportion according to the requirements of cement products to obtain slurry;

s2, preparing a cement product mould, and fixedly placing a steam-curing-free net in the middle of the inner side of the mould;

s3, pouring the slurry into the mold to enable the slurry to be in a state of wrapping the steam-curing-free net, and demolding to obtain a cement product;

and S4, gradually releasing heat by the plurality of self-heating balls on the steam-curing-free net in the cement product, and realizing the self-steam curing of the cement product.

Can be through exempting from to evaporate the use of curing the net, at the in-process that mud was pour, it is free from the hot ball of the part on the curing net under the impact friction of mud to evaporate, can take place cracked condition, thereby make self-heating liquid spill over and react with quick lime granule, to the not cracked self-heating ball of another part, the cotton stick of drain in it can be with in self-heating liquid conduction to quick lime granule with quick lime granule reaction, and then produce the heat, realize the self-steaming to this cement product, thereby reduce the step that carries out steam curing to cement product among the prior art, thereby effectively improve the preparation efficiency of this cement product, cost input when effectively reducing this cement product of production simultaneously.

Further, the cement, the sand, the pebbles, the water and the additive comprise the following components in parts by mass: 15-20 parts of cement, 25-30 parts of sand, 50-60 parts of pebbles, 5-10 parts of water and 2-3 parts of additives.

Furthermore, the ratio of the sand to the pebbles in the grain diameter is 1: 20-30.

Furthermore, the additive comprises a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and glycol, and the freezing point of water contained in the cement product can be effectively reduced through the glycol, so that the condition that the cement product is frozen and damaged at low temperature is effectively relieved, and the service life of the cement product is prolonged.

Furthermore, a plurality of self-heating balls are respectively fixedly connected to each node of the steaming-free net, a plurality of uniformly distributed spherical grooves are formed in the edges of the self-heating balls, and quick lime particles are filled in the spherical grooves.

Further, from hot ball is hollow structure, from hot ball inside packing has self-heating liquid, and at the in-process that mud was pour, part is from hot ball under the impact friction of mud, can take place cracked condition to make self-heating liquid spill over and react with quick lime granule, and then produce the heat, realize the self-steaming to this cement product, thereby reduce among the prior art and carry out the step of steam curing to cement product, thereby effectively improve the preparation efficiency of this cement product, cost input when effectively reducing this cement product of production simultaneously.

Furthermore, the self-heating liquid is a mixed liquid of water and ethylene glycol according to the proportion of 1:0.3-0.5, and the ethylene glycol can effectively reduce the freezing point of the self-heating liquid, so that the self-heating liquid is not easy to solidify when the self-heating liquid is not completely reacted with quicklime particles, thereby avoiding the damage of the solidification of the self-heating liquid to cement products.

Further, self-heating ball inside mosaic has a plurality of evenly distributed's liquid guide cotton swab, and is a plurality of liquid guide cotton swab is corresponding with a plurality of spherical grooves respectively, liquid guide cotton swab both ends are embedded into respectively in self-heating liquid and the quick lime granule, can transmit self-heating liquid to quick lime granule gradually through liquid guide cotton swab in for partly not strikeed the quick lime granule in the cracked self-heating ball by mud equally can react with self-heating liquid, thereby realize that self-heating carries out the effect of self-curing.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme can be through exempting from to evaporate the use of curing the net, at the in-process that mud was pour, it is free from evaporating the part self-heating ball that cures on the net under the impact friction of mud, can take place cracked condition, thereby make self-heating liquid spill over and react with quick lime granule, to another part non-cracked self-heating ball, the cotton stick of drain in it can be with in self-heating liquid conduction to quick lime granule with quick lime granule reaction, and then produce the heat, realize the self-steaming to this cement product, thereby reduce the step that carries out steam curing to cement product among the prior art, thereby effectively improve the preparation efficiency of this cement product, cost input when effectively reducing this cement product of production simultaneously.

(2) The cement, sand, pebbles, water and additive comprise the following components in parts by mass: 15-20 parts of cement, 25-30 parts of sand, 50-60 parts of pebbles, 5-10 parts of water and 2-3 parts of additives.

(3) The particle diameter ratio of the sand to the pebbles is 1: 20-30.

(4) The additive comprises a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and glycol, and the freezing point of moisture contained in the cement product can be effectively reduced through the glycol, so that the condition that the cement product is frozen and damaged at low temperature is effectively relieved, and the service life of the cement product is prolonged.

(5) A plurality of self-heating balls are fixedly connected to each node of the steaming-free net respectively, a plurality of uniformly distributed spherical grooves are formed in the edges of the self-heating balls in a chiseled mode, and quick lime particles are filled in the spherical grooves.

(6) From hot ball is hollow structure, from hot ball inside packing has self-heating liquid, at the in-process that mud was pour, the part is from hot ball under the impact friction of mud, the condition that can take place to break, thereby make self-heating liquid spill over and react with quick lime granule, and then the production of heat, realize the self-steaming to this cement product, thereby reduce among the prior art and carry out steam curing's step to cement product, thereby effectively improve the preparation efficiency of this cement product, cost input when effectively reducing this cement product of production simultaneously.

(7) The self-heating liquid is a mixed liquid of water and glycol according to the proportion of 1:0.3-0.5, and the glycol can effectively reduce the freezing point of the self-heating liquid, so that the self-heating liquid is not easy to solidify when the self-heating liquid is not completely reacted with quicklime particles, thereby avoiding the damage of the solidification of the self-heating liquid to cement products.

(8) Self-heating ball inside mosaic has a plurality of evenly distributed's liquid guide cotton stick, and a plurality of liquid guide cotton sticks correspond with a plurality of spherical grooves respectively, and liquid guide cotton stick both ends are embedded into respectively in self-heating liquid and quick lime granule, can transmit self-heating liquid to quick lime granule gradually through the liquid guide cotton stick in for partly not strikeed broken quick lime granule in the self-heating ball by mud equally can react with self-heating liquid, thereby realize that self-heating carries out the effect of self-curing.

Drawings

FIG. 1 is a principal flow diagram of the present invention;

FIG. 2 is a schematic three-dimensional structure of the steam-curing-free net of the present invention;

FIG. 3 is a schematic diagram of the front face of the self-heating ball of the present invention.

The reference numbers in the figures illustrate:

1 non-steam curing net, 2 self-heating ball, 3 spherical groove, 4 quicklime particles and 5 liquid guide cotton rod.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1, a cement product steam curing-free process includes the following steps:

s2, preparing a cement product mould, and fixedly placing an evaporation-free net 1 in the middle of the inner side of the mould;

s3, pouring the slurry into the mold to enable the slurry to be in a state of wrapping the steam-curing-free net 1, and demolding to obtain a cement product;

and S4, gradually releasing heat by the plurality of self-heating balls 2 on the steam-curing-free net 1 in the cement product, and realizing the self-steaming curing of the cement product.

The cement, sand, pebbles, water and additive comprise the following components in parts by mass: the cement product comprises 15 parts of cement, 25 parts of sand, 50 parts of pebbles, 5 parts of water and 2 parts of additives, wherein the particle diameter ratio of the sand to the pebbles is 1:20, the additives comprise a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and ethylene glycol, and the freezing point of water contained in the cement product can be effectively reduced through the ethylene glycol, so that the condition that the cement product is frozen and damaged at low temperature is effectively relieved, and the service life of the cement product is prolonged.

Example 2:

The cement, sand, pebbles, water and additive comprise the following components in parts by mass: the cement product comprises 15 parts of cement, 28 parts of sand, 56 parts of pebbles, 7 parts of water and 2.5 parts of additives, wherein the particle diameter ratio of the sand to the pebbles is 1:25, the additives comprise a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and ethylene glycol, and the freezing point of water contained in the cement product can be effectively reduced through the ethylene glycol, so that the condition that the cement product is frozen and damaged at low temperature is effectively relieved, and the service life of the cement product is prolonged.

Example 3:

The cement, sand, pebbles, water and additive comprise the following components in parts by mass: the cement product comprises 20 parts of cement, 30 parts of sand, 60 parts of pebbles, 10 parts of water and 3 parts of additives, wherein the particle diameter ratio of the sand to the pebbles is 1:30, the additives comprise a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and ethylene glycol, and the freezing point of water contained in the cement product can be effectively reduced through the ethylene glycol, so that the condition that the cement product is frozen and damaged at low temperature is effectively relieved, and the service life of the cement product is prolonged.

The components of the ingredients in the formulas in the three embodiments are only a few actual formula proportions, and the specific formula proportions can be optimized according to the specific requirements of the cement product.

Referring to fig. 3, a plurality of self-heating balls 2 are respectively fixedly connected to each node of the non-curing net 1, a plurality of uniformly distributed spherical grooves 3 are cut on the edges of the self-heating balls 2, quicklime particles 4 are filled in the spherical grooves 3, the self-heating balls 2 are of a hollow structure, self-heating liquid is filled in the self-heating balls 2, in the slurry pouring process, part of the self-heating balls 2 are broken under the impact friction of slurry, so that the self-heating liquid overflows and reacts with the quicklime particles 4 to generate heat, the self-curing of the cement product is realized, the steps of steam curing of the cement product in the prior art are reduced, the preparation efficiency of the cement product is effectively improved, the cost input in the production of the cement product is effectively reduced, the self-heating liquid is a mixed liquid of water and ethylene glycol according to a ratio of 1:0.3-0.5, and the freezing point of the self-heating liquid can be effectively reduced by the ethylene glycol, make it at not reacting with quick lime granule 4 completely, be difficult for solidifying, thereby avoid its injury that solidifies and cause the cement product, self-heating ball 2 inside is inlayed and is had a plurality of evenly distributed's drain cotton stick 5, a plurality of drain cotton sticks 5 correspond with a plurality of spherical grooves 3 respectively, drain cotton stick 5 both ends are embedded into respectively in self-heating liquid and quick lime granule 4, can transmit self-heating liquid to quick lime granule 4 gradually through drain cotton stick 5 in, make partial quick lime granule 4 in not being impacted cracked self-heating ball 2 by the mud equally can react with self-heating liquid, thereby realize the self-heating effect of carrying out self-curing.

Can be through exempting from to evaporate the use of curing net 1, at the in-process that mud was pour, it is free from the hot ball 2 of the part on the curing net 1 under the impact friction of mud to evaporate, can take place cracked condition, thereby make self-heating liquid spill over and react with quick lime granule 4, to another part not cracked self-heating ball 2, drain cotton stick 5 in it can be with in self-heating liquid conduction to quick lime granule 4 with quick lime granule 4 reaction, and then produce the heat, realize the self-steaming to this cement product, thereby reduce among the prior art and carry out the step of steam curing to cement product, thereby effectively improve the preparation efficiency of this cement product, cost input when effectively reducing this cement product of production simultaneously.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The steam curing-free process for cement products is characterized by comprising the following steps of: the method comprises the following steps:

s2, preparing a cement product mould, and fixedly placing a steam-curing-free net (1) in the middle of the inner side of the mould;

s3, pouring the slurry into the mold to enable the slurry to be in a state of wrapping the steam-curing-free net (1), and demolding to obtain a cement product;

s4, gradually releasing heat by the plurality of self-heating balls (2) on the steam-curing-free net (1) in the cement product, and realizing the self-steaming curing of the cement product.

2. The steam-curing-free process for cement products according to claim 1, characterized in that: the cement, the sand, the pebbles, the water and the additive are prepared from the following components in parts by mass: 15-20 parts of cement, 25-30 parts of sand, 50-60 parts of pebbles, 5-10 parts of water and 2-3 parts of additives.

3. The steam-curing-free process for cement products according to claim 2, characterized in that: the particle diameter ratio of the sand to the pebbles is 1: 20-30.

4. The steam-curing-free process for cement products according to claim 1, characterized in that: the additive comprises a high-efficiency water reducing agent, a rust inhibitor, an air entraining agent, a waterproof agent and glycol.

5. The steam-curing-free process for cement products according to claim 1, characterized in that: a plurality of from hot ball (2) respectively fixed connection exempt from to evaporate each node of curing net (1), from hot ball (2) edge excavation has a plurality of evenly distributed's spherical groove (3), spherical groove (3) inside packing has quick lime granule (4).

6. The steam-curing-free process for cement products according to claim 5, characterized in that: the self-heating ball (2) is of a hollow structure, and self-heating liquid is filled in the self-heating ball (2).

7. The steam-curing-free process for cement products according to claim 6, characterized in that: the self-heating liquid is a mixed liquid of water and ethylene glycol according to the proportion of 1: 0.3-0.5.

8. The steam-curing-free process for cement products according to claim 7, characterized in that: from hot ball (2) inside inlay and have a plurality of evenly distributed's drain cotton stick (5), it is a plurality of drain cotton stick (5) are corresponding with a plurality of spherical grooves (3) respectively, drain cotton stick (5) both ends are embedded into respectively in self-heating liquid and quick lime granule (4).