CN-122010594-A - Self-heating curing system for winter concrete construction and curing method thereof

CN122010594ACN 122010594 ACN122010594 ACN 122010594ACN-122010594-A

Abstract

The invention belongs to the technical field of concrete construction maintenance, and particularly relates to a self-heating maintenance system for winter concrete construction and a maintenance method thereof, comprising a heating model formed by splicing heat-conducting metal plates, wherein the heating model is supported above a concrete structure to be maintained through a supporting die, the heating model comprises a top layer, a bottom layer and an intermediate layer clamped between the top layer and the bottom layer, the top layer and the bottom layer are filled with paraffin phase-change materials, the intermediate layer comprises a template layer, a functional layer and a heat-insulating layer which are sequentially arranged, the template layer is close to the concrete structure, the functional layer is divided into a plurality of reaction sections which can be triggered independently through longitudinal battens, and each reaction section is filled with calcium oxide with equal quality and is provided with a water supply device, and the self-heating maintenance system has the beneficial effects that: and constructing a double-heat-source cooperative heating system by combining the repeated heat charging and discharging characteristic of the paraffin phase-change material and the chemical heat discharging characteristic of calcium oxide, and realizing the on-demand release and continuous supply of heat through time sequence control.

Inventors

Tian Yangchen
WEI CHANGMIN
LIANG SHAOGANG
Yin Shuaibo
WANG LIYE
Li Rongfan
LIN ZHIQIANG

Assignees

中建八局第二建设有限公司

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (9)

1. The self-heating curing system for the winter concrete construction is characterized by comprising a heating model formed by splicing heat-conducting metal plates, wherein the heating model is supported above a concrete structure to be cured through a formwork, and comprises a top layer, a bottom layer and an intermediate layer clamped between the top layer and the bottom layer; the top layer and the bottom layer are both filled with paraffin phase change materials, the middle layer comprises a template layer, a functional layer and a heat preservation layer which are sequentially arranged, the template layer is close to the concrete structure, the functional layer is divided into a plurality of reaction zones which can be triggered independently through longitudinal battens, and each reaction zone is filled with calcium oxide with equal quality and is provided with a water supply device; The water supply device is further electrically connected with a control module, the control module is electrically connected with a temperature control sensor for monitoring the surface temperature of the concrete structure, and when the surface temperature of the concrete structure is lower than a set threshold value, the control module controls the water supply device to supply water to a plurality of reaction regions of the functional layer in sequence, so that staged release of heat is realized.
2. The self-heating maintenance system for winter concrete construction of claim 1, wherein the template layer is an inner heat conducting metal template, the heat preservation layer is an outer heat preservation plate, the template layer is separated from the functional layer and the bottom layer by a separation layer, and the functional layer and the top layer are separated from each other by the heat preservation layer.
3. The self-heating curing system for winter concrete construction of claim 1, wherein the surface of the template layer is provided with air holes.
4. The self-heating maintenance system for winter concrete construction of claim 1, wherein the water supply device comprises a water pipeline and a water pump, the water pipeline is correspondingly arranged in each reaction zone of the functional layer, one end of the water pipeline is connected with the water pump, the other end of the water pipeline extends into each reaction zone, a pipeline valve is arranged in the middle of the water pipeline, and the control module is respectively and electrically connected with the water pump and the pipeline valve.
5. The self-heating maintenance system for winter concrete construction of claim 4, wherein the number of the reaction zones is 12, the 12 reaction zones are uniformly divided into three groups, and the control module triggers one group of reaction zones for hydration exothermic reaction every day.
6. The self-heating maintenance system for winter concrete construction of claim 5, wherein the mass ratio of the calcium oxide to the water is 2:1.
7. The self-heating maintenance system for winter concrete construction according to claim 6, wherein the set threshold is 5 ℃.
8. A curing method of a self-heating curing system for winter concrete construction is characterized in that the curing method of the self-heating curing system for winter concrete construction in claim 7 comprises the following steps, Splicing the bottom layer, the template layer, the functional layer, the heat preservation layer and the top layer of the heating model by means of the supporting model, and splicing and fixing the bottom layer, the template layer, the functional layer, the heat preservation layer and the top layer above the concrete structure; Arranging a water pipeline and a temperature control sensor, wherein the water pipeline and the frame body are arranged in a small Liang Jiaocuo way, and the temperature control sensor is built in the water pipeline to monitor the surface temperature of the concrete structure in real time; the temperature control sensor is electrically connected with the input end of the control module, the water supply device is electrically connected with the output end of the control module, when the temperature monitored by the temperature control sensor is lower than 5 ℃, a signal is output to the control module, the control module controls the water supply device to supply water to the reaction zone, and calcium oxide hydration heat release is triggered; and fourthly, after curing until the strength of the concrete reaches the standard, removing the heating model, taking out the paraffin phase-change material in the heating model, and heating and drying the paraffin phase-change material for repeated use.
9. The method of claim 8, wherein in the third step, the control module adds a proper amount of water into one of the three groups of reaction zones every day according to the time sequence control logic, so as to ensure that the heat released by the calcium oxide maintains the heating model for 3 days until the strength of the concrete reaches the standard.

Description

Self-heating curing system for winter concrete construction and curing method thereof Technical Field The invention relates to the technical field of concrete construction maintenance, in particular to a self-heating maintenance system for winter concrete construction and a maintenance method thereof. Background In cold areas, the construction and maintenance of concrete in winter are key links for guaranteeing the engineering quality. In the low-temperature environment of the concrete in winter, if the curing temperature is insufficient, the strength of the concrete can be stopped, and even the structure is damaged due to frost heaving of internal water. According to the requirements of the current specification JGJ/T104-2011, the surface temperature of the concrete needs to be maintained above a specific value before reaching the freezing critical strength. At present, the most common method for curing concrete in winter in cold areas is to heat by adopting an external heat source, such as building a heat preservation shed and combining equipment such as a coal-fired boiler, an electric blanket or a hot air blower. However, the traditional methods have the defects of high energy consumption, high operation cost, high thermal inertia due to the fact that external energy supply is relied on, high temperature control lag is achieved due to the fact that external heating mode is high in thermal inertia, high maintenance temperature fluctuation is caused, strength development of concrete is affected, safety risks such as fire disaster and electric shock exist, environment protection requirements of green construction are not met, and carbon emission is high. In the prior art, although research is attempted to utilize phase change material to store heat for curing, the heat release power of a single phase change material is limited, the heat release rate is low, the temperature required by concrete curing is difficult to maintain for a long time under extremely cold conditions, and the requirement of long-time constant-temperature concrete curing in winter cannot be independently met. Therefore, development of a winter concrete curing technology which does not need external energy, is stable in heat supply duration, accurate in temperature control, environment-friendly and safe is needed. Disclosure of Invention The invention aims at the problems in the prior art, and specifically designs a self-heating curing system for winter concrete construction and a curing method thereof, so as to solve the defects in the prior art. The self-heating curing system for the winter concrete construction comprises a heating model formed by splicing heat-conducting metal plates, wherein the heating model is supported above a concrete structure to be cured through a formwork, the heating model comprises a top layer, a bottom layer and a middle layer clamped between the top layer and the bottom layer, the top layer and the bottom layer are filled with paraffin phase-change materials, the middle layer comprises a template layer, a functional layer and a heat preservation layer which are sequentially arranged, the template layer is close to the concrete structure, the functional layer is divided into a plurality of reaction sections which can be triggered independently through longitudinal battens, equal-quality calcium oxide is filled in each reaction section and is provided with a water supply device, the water supply device is further electrically connected with a control module, the control module is electrically connected with a temperature control sensor for monitoring the surface temperature of the concrete structure, and when the surface temperature of the concrete structure is lower than a set threshold value, the control module controls the water supply device to supply water to the reaction sections of the functional layer in sequence, so that heat is released in stages. Further, the template layer is an inner layer heat conduction metal template, the heat preservation layer is an external heat preservation plate, the functional layer and the bottom layer are separated from each other by the template layer, and the functional layer and the top layer are separated from each other by the heat preservation layer. Further, the surface of the template layer is provided with air holes. Further, the water supply device comprises a water pipeline and a water pump, each reaction zone of the water pipeline and the functional layer is correspondingly provided, one end of the water pipeline is connected with the water pump, the other end of the water pipeline extends into each reaction zone, a pipeline valve is arranged in the middle of the water pipeline, and the control module is respectively and electrically connected with the water pump and the pipeline valve. Furthermore, the number of the reaction zones is 12, the 12 reaction zones are uniformly divided into three groups, and the control module triggers one group of reaction z