A concrete humidity control material and method of use

Abstract

This invention discloses a concrete humidity control material and its application method, relating to a building material. Its purpose is to provide a concrete humidity control material and its application method that can solve the problem of concrete shrinkage cracking and improve concrete durability. The concrete humidity control material of this invention comprises a multi-layer structure, consisting of, from top to bottom, a retaining layer, a slow-release layer, a separating layer, a quick-release layer, and another separating layer, with each layer connected by adhesive. The concrete humidity control material of this invention can be directly applied to the concrete surface, effectively releasing moisture based on changes in the relative humidity inside the concrete, thereby ensuring effective hydration of the cementitious material and preventing shrinkage caused by drying, thus improving the durability of the concrete.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a concrete humidity control material and its application method. Background Technology

[0002] Shrinkage cracking in concrete is a common quality issue during construction, not only reducing its durability but also seriously threatening the safety of concrete structures. Studies have shown that shrinkage cracking is related to changes in the internal humidity of concrete. The hydration of cementitious materials in concrete consumes a significant amount of water, leading to a decrease in the internal humidity. Furthermore, external factors such as temperature, humidity, and wind can cause rapid water loss from the concrete surface, accelerating the reduction in internal humidity and thus contributing to the formation of shrinkage cracks.

[0003] Although attempts have been made to suppress the formation of shrinkage cracks in concrete through various remedial measures, including adding expansive agents, internal curing agents, and adjusting the concrete mix proportions, these measures have either limited effectiveness or adversely affect the mechanical properties of the concrete. Therefore, further research is needed to develop effective methods for controlling the internal moisture content of concrete while isolating it from external environmental influences to improve concrete durability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a concrete moisture control material and its application method that can solve the problem of concrete shrinkage cracking and improve concrete durability.

[0005] The present invention provides a technical solution for a concrete humidity control material, comprising a multi-layer structure, which consists of a retaining layer, a slow-release layer, a separator layer, a quick-release layer and a separator layer from top to bottom, and the layers are connected by adhesive bonding.

[0006] This invention discloses a concrete humidity control material, wherein the retaining layer is made of a porous membrane with a porous metal-organic framework embedded on its surface. The retaining layer can reduce the rapid loss of internal moisture and condensation of moisture from the air.

[0007] This invention discloses a concrete humidity control material, wherein the slow-release layer is made of a highly absorbent resin with a particle size between 20 and 300 mesh, and a water absorption rate greater than 500 times its own weight. The slow-release layer can regulate humidity during the later stages of concrete hydration, preventing the risk of shrinkage cracking.

[0008] The present invention discloses a concrete humidity control material, wherein the thickness of the slow-release layer is 0.2 mm to 1.0 mm.

[0009] This invention discloses a concrete moisture control material, wherein the quick-release layer is composed of 60%–80% expanded perlite, 10%–20% inorganic fiber particles, and 10%–20% cenospheres by mass. The quick-release layer provides moisture replenishment for the early and rapid hydration of concrete.

[0010] The present invention provides a concrete humidity control material, wherein the thickness of the quick-release layer is 1.0 mm to 2 mm.

[0011] This invention discloses a concrete humidity control material, wherein the separating layer is made of an ultra-thin porous membrane with a water absorption rate of 10 to 15 times its own weight. The different effective layers are distinguished by the separating layer.

[0012] Another technical solution provided by the present invention is a method for using a concrete humidity control material, which involves first soaking the concrete humidity control material in water for 5 minutes and then taking it out and then directly laying it on the concrete surface.

[0013] The present invention relates to a concrete humidity control material and its application method, which differs from existing technologies in that the present invention controls the internal humidity of freshly mixed concrete to alleviate shrinkage and cracking caused by drying. Different water release systems can provide water replenishment for the hydration of cementitious materials in concrete, thereby achieving more complete hydration of cementitious materials and improving the mechanical properties of concrete. The humidity control material prepared by the present invention mainly uses physical water absorption and release behavior, which not only enables rapid material replacement but also allows for repeated use, making it more environmentally friendly.

[0014] The following description, in conjunction with the accompanying drawings, further illustrates a concrete humidity control material and its application method according to the present invention. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a concrete humidity control material according to the present invention;

[0016] Figure 1 In the middle, 1-separation layer; 2-immediate release layer; 3-sustaining release layer; 4-retention layer. Detailed Implementation

[0017] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0018] Example 1

[0019] like Figure 1 As shown, the present invention provides a concrete humidity control material comprising a multi-layer structure, which consists of, from top to bottom, a retention layer, a slow-release layer, a separation layer, a quick-release layer, and a separation layer, and the layers are connected by adhesive bonding.

[0020] The retention layer is located at the top layer. The material of the retention layer is a porous membrane, and its surface is embedded with a porous metal-organic framework.

[0021] The sustained-release layer is located below the retention layer. The sustained-release layer is made of a superabsorbent resin with a particle size of 20-40 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 0.2 mm.

[0022] The immediate-release layer is located below the sustained-release layer, and there is a separating layer above and below the immediate-release layer. The immediate-release layer is made of 60% expanded perlite, 20% inorganic fiber particles, and 20% cenospheres by weight. The thickness of the immediate-release layer is 1.0 mm.

[0023] The separator is made of an ultra-thin porous membrane, which has a water absorption rate of about 10 times its own weight.

[0024] The method of using the concrete humidity control material of the present invention is to first soak the concrete humidity control material in water for 5 minutes, then take it out and then directly lay it on the concrete surface.

[0025] Example 2

[0026] like Figure 1 As shown, the present invention provides a concrete humidity control material comprising a multi-layer structure, which consists of, from top to bottom, a retention layer, a slow-release layer, a separation layer, a quick-release layer, and a separation layer, and the layers are connected by adhesive bonding.

[0027] The retention layer is located at the top layer. The material of the retention layer is a porous membrane, and its surface is embedded with a porous metal-organic framework.

[0028] The sustained-release layer is located below the retention layer. The sustained-release layer is made of a superabsorbent resin with a particle size of 80 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 0.4 mm.

[0029] The immediate-release layer is located below the sustained-release layer, and there is a separating layer above and below the immediate-release layer. The immediate-release layer is made of 65% expanded perlite, 15% inorganic fiber particles, and 20% cenospheres by weight. The thickness of the immediate-release layer is 1.2 mm.

[0030] The separator is made of an ultra-thin porous membrane, which has a water absorption rate of about 12 times its own weight.

[0031] The method of using the concrete humidity control material of the present invention is to first soak the concrete humidity control material in water for 5 minutes, then take it out and then directly lay it on the concrete surface.

[0032] Example 3

[0033] like Figure 1As shown, the present invention provides a concrete humidity control material comprising a multi-layer structure, which consists of, from top to bottom, a retention layer, a slow-release layer, a separation layer, a quick-release layer, and a separation layer, and the layers are connected by adhesive bonding.

[0034] The retention layer is located at the top layer. The material of the retention layer is a porous membrane, and its surface is embedded with a porous metal-organic framework.

[0035] The sustained-release layer is located below the retention layer. The sustained-release layer is made of a superabsorbent resin with a particle size of 160 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 0.6 mm.

[0036] The immediate-release layer is located below the sustained-release layer, and there is a separating layer above and below the immediate-release layer. The immediate-release layer is made of 70% expanded perlite, 15% inorganic fiber particles, and 15% cenospheres by weight. The thickness of the immediate-release layer is 1.4 mm.

[0037] The separator is made of an ultra-thin porous membrane, which has a water absorption rate of about 14 times its own weight.

[0038] The method of using the concrete humidity control material of the present invention is to first soak the concrete humidity control material in water for 5 minutes, then take it out and then directly lay it on the concrete surface.

[0039] Example 4

[0040] like Figure 1 As shown, the present invention provides a concrete humidity control material comprising a multi-layer structure, which consists of, from top to bottom, a retention layer, a slow-release layer, a separation layer, a quick-release layer, and a separation layer, and the layers are connected by adhesive bonding.

[0041] The retention layer is located at the top layer. The material of the retention layer is a porous membrane, and its surface is embedded with a porous metal-organic framework.

[0042] The sustained-release layer is located below the retention layer. The sustained-release layer is made of a superabsorbent resin with a particle size of 230 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 0.8 mm.

[0043] The immediate-release layer is located below the sustained-release layer, and there is a separating layer above and below the immediate-release layer. The immediate-release layer is made of 70% expanded perlite, 15% inorganic fiber particles, and 15% cenospheres by weight. The thickness of the immediate-release layer is 1.7 mm.

[0044] The separator is made of an ultra-thin porous membrane, which has a water absorption rate of about 13 times its own weight.

[0045] The method of using the concrete humidity control material of the present invention is to first soak the concrete humidity control material in water for 5 minutes, then take it out and then directly lay it on the concrete surface.

[0046] Example 5

[0047] like Figure 1 As shown, the present invention provides a concrete humidity control material comprising a multi-layer structure, which consists of, from top to bottom, a retention layer, a slow-release layer, a separation layer, a quick-release layer, and a separation layer, and the layers are connected by adhesive bonding.

[0048] The retention layer is located at the top layer. The material of the retention layer is a porous membrane, and its surface is embedded with a porous metal-organic framework.

[0049] The sustained-release layer is located below the retention layer. The sustained-release layer is made of a superabsorbent resin with a particle size of 300 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 1.0 mm.

[0050] The immediate-release layer is located below the sustained-release layer, and there is a separating layer above and below the immediate-release layer. The immediate-release layer is made of 80% expanded perlite, 10% inorganic fiber particles, and 10% cenospheres by weight. The thickness of the immediate-release layer is 2.0 mm.

[0051] The separator is made of an ultra-thin porous membrane, which has a water absorption rate of about 15 times its own weight.

[0052] The method of using the concrete humidity control material of the present invention is to first soak the concrete humidity control material in water for 5 minutes, then take it out and then directly lay it on the concrete surface.

[0053] Comparative Example 1

[0054] A type of concrete, by mass percentage, comprises the following raw materials: 7% cement, 7% fly ash, 10% water, 29% sand, and 47% aggregate. As a comparative example, the concrete humidity control material of the present invention is not applied to the surface of the above-mentioned concrete.

[0055] Table 1 shows the changes in concrete properties based on the materials used in the unpaved (Comparative Example 1) and paved examples 1–5.

[0056] Table 1. Changes in Concrete Performance

[0057]

[0058] As can be seen from Table 1, compared with the baseline group, applying the concrete humidity control material of the present invention to the concrete surface can effectively improve the 28-day compressive strength of concrete, especially in Example 4, where the strength improvement rate is 66.9%. This is because the humidity control material can provide moisture support for the hydration of cementitious materials and accelerate the generation of hydration products, which is beneficial to the improvement of concrete strength.

[0059] Furthermore, the concrete humidity control material of the present invention can rapidly reduce concrete shrinkage. Compared with the baseline group, the shrinkage rate in Example 4 was reduced from 0.55% to 0.01% after 7 days. This is because the humidity control material can not only isolate the influence of external dry conditions, but also promote the hydration of concrete and improve the concrete's ability to resist shrinkage.

[0060] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A concrete humidity control material, characterized in that: The material comprises a multi-layer structure, consisting of, from top to bottom, a retention layer, a sustained-release layer, a separator layer, and an immediate-release layer. The retention layer is made of a porous membrane with a porous metal-organic framework embedded on its surface. The sustained-release layer is made of a highly absorbent resin with a particle size between 20 and 300 mesh and a water absorption rate greater than 500 times its own weight. The thickness of the sustained-release layer is 0.2 mm to 1.0 mm. The immediate-release layer consists of 60% to 80% expanded perlite, 10% to 20% inorganic fiber particles, and 10% to 20% cenospheres by weight. The thickness of the immediate-release layer is 1.0 mm to 2 mm. The separator layer is made of an ultrathin porous membrane with a water absorption rate 10 to 15 times its own weight.

2. A method for using a concrete humidity control material, characterized in that: The concrete humidity control material of claim 1 is soaked in water for 5 minutes, then removed and directly laid on the concrete surface.

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