KR-20260065633-A - concrete composition and lightweight concrete panel

Abstract

The present invention relates to a concrete composition and a lightweight concrete panel, and more specifically, to a concrete composition and a lightweight concrete panel that not only have excellent durability while being lightweight, but also have excellent water repellency.

Inventors

• 나용범

Assignees

• 주식회사 한국씨앤에스

Dates

Publication Date

20260511

Application Date

20241030

Claims (5)

1. A concrete composition comprising cement, crushed pumice, a water repellent, and a foaming agent.
2. In paragraph 1, The above concrete composition comprises, per 100 parts by weight of cement, 10 to 20 parts by weight of crushed pumice, 3 to 8 parts by weight of a water repellent, and 5 to 15 parts by weight of a foaming agent.
3. In paragraph 2, The above-mentioned crushed pumice is a concrete composition having a density of 0.8 to 1.2 g/ cm³ , a unit volume mass of 370 to 410 kg/L, and an average particle size of 3 to 8 mm.
4. In paragraph 2, The above water repellent comprises zinc stearate having an average particle size of 150 to 250 mesh, and The above foaming agent is a concrete composition comprising alkylbenzene sulfonate.
5. A concrete molded article manufactured by molding the concrete composition of claim 1; and A water-repellent coating layer formed on one surface of the above-mentioned concrete molded product; comprising, A lightweight concrete panel comprising a water-repellent coating layer including a compound represented by the following chemical formula 1 and a compound represented by the following chemical formula 2. [Chemical Formula 1] [Chemical Formula 2] In the above chemical formula 1, B1 and B 2 are each independently -CH 2 -, -CH 2 CH 2 -, -CH 2 CH 2 CH 2 -, -CH 2 CH 2 CH 2 CH 2 - or -CH 2 CH 2 CH 2 CH 2 CH 2 -, and B 3 and B 4 are each independently -CF 2 -, -CF 2 CF 2 -, -CF 2 CF 2 CF 2 -, -CF 2 CF 2 CF 2 CF 2 - or -CF 2 CF 2 CF 2 CF 2 CF 2 -, n is 1 to 10, and In the above chemical formula 2, B 5 , B6 and B7 are each independently -CH2- , -CH2CH2- , -CH2CH2CH2- , -CH2CH2CH2CH2- , or -CH2CH2CH2CH2CH2CH2- , and m and l are each independently 5 to 20 .

Description

Concrete composition and lightweight concrete panel The present invention relates to a concrete composition and a lightweight concrete panel, and more specifically, to a concrete composition and a lightweight concrete panel that not only have excellent durability while being lightweight, but also have excellent water repellency. To date, lightweight foamed concrete panels have been widely used as building materials, for example, for exterior walls, partitions, floors, and roofs, particularly due to their advantages in lightness, fire resistance, thermal insulation, and ease of construction. Powdered siliceous and calcareous materials are the base components of these lightweight foamed concrete panels, and these panels are manufactured by allowing air bubbles or pores to exist inside, then semi-curing them, and subsequently steam curing them at high temperature and high pressure. Immediately after manufacturing, lightweight foamed concrete panels contain about 40% by weight of moisture, but they dry out during storage, shipping, and construction periods, reaching about 10% by weight of moisture. Due to the large size and quantity of lightweight foamed concrete panels, indoor storage is practically impossible, so they are typically stored outdoors. To protect the panels from rain and snow, covering them with vinyl sheets can be considered. However, implementing such measures on large sites, such as lightweight foamed concrete panel factories, requires a significant amount of time and effort to cover and remove stacked panels; furthermore, this method hinders the drying of the panels. Moreover, considering the total cost of the vinyl sheets, including purchase, storage, and maintenance, this method is certainly not very practical. However, if lightweight foamed concrete panels stored outdoors without being covered by vinyl sheets are exposed to rain or snow, water is absorbed through the outer surface, which not only delays drying but eventually causes the white panels to discolor to gray or reddish-brown. As a result, the appearance and quality deteriorate, leading to an increase in the weight of the lightweight foamed concrete panels. Moreover, not only does the outer surface of lightweight foamed concrete panels discolor due to water absorption, but airborne dust during rainfall adheres to the surface, causing contamination and discoloration during the drying process and remaining on the outer surface, degrading the appearance and quality. As a result, in order to prevent water absorption through the outer surface of lightweight foamed concrete panels stored outdoors, a method for manufacturing water-repellent lightweight foamed concrete panels is being proposed, which provides water repellency to lightweight foamed concrete panels by mixing a silicone-based water-repellent material into a starting slurry mixture of a foaming agent (e.g., aluminum metal), water, and base components of siliceous and calcareous materials during the manufacture of lightweight foamed concrete panels. Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals are assigned to identical or similar components throughout the specification. The concrete composition of the present invention may include cement and crushed pumice. First, the cement is not specifically limited but may include one or more selected from lime cement, blast furnace lime cement, gypsum cement, magnesia cement, Portland cement, blast furnace slag cement, fly ash cement, and Portland pozzolan cement, and preferably may include one or more selected from gypsum cement, blast furnace slag cement, and Portland cement. Portland cement (KS L 5201) is produced by mixing raw materials containing silica, aluminum, iron oxide, and lime as main components in appropriate proportions, calcining the mixture to obtain clinker, adding an appropriate amount of gypsum, and pulverizing it. Portland cement is classified into Type 1 ordinary Portland cement, Type 2 medium-heat Portland cement, Type 3 rapid-hardening Portland cement, Type 4 low-heat Portland cement, and Type 5 sulfate-resistant Portland cement, and in the present invention, all types of Portland cement can be applied depending on the application. Blast furnace slag cement (KS L 5210) is a cement in which blast furnace slag, a byproduct of steelmaking plants, is added as an admixture to Portland cement. It has high late strength, low heat of hydration, and good chemical resistance and heat resistance. Fly ash cement (KS L 5211) is a cement in which coal combustion ash from a thermal power plant is added as an admixture to Portl