Pumice encapsulated SOY wax phase change material added foam concrete

Abstract

The invention relates to a foam concrete product with a pumice-encapsulated soya wax phase change material and a method of manufacturing the product.

Description

[0001] PUMICE ENCAPSULATED SOY WAX PHASE CHANGE MATERIAL ADDED FOAM CONCRETE

[0002] TECHNICAL FIELD

[0003] The invention relates to a foam concrete product with a pumice-encapsulated soy wax phase change material and a method of manufacturing the product.

[0004] BACKGROUND

[0005] Foam concrete is a material known for its lightness and high insulation properties. Cement, water, fine aggregates and stabilizer foam are used in its production. The production process includes the preparation of materials, foam production, preparation of the mixture, casting and curing. Firstly, cement, water and aggregates such as fine sand are mixed until a homogenous mixture is obtained. Then, foam is formed by mixing the foaming agent with water and this foam is added to the concrete mix. The prepared foam concrete mixture is poured into molds and left to cure so that the concrete gains strength.

[0006] Foam concrete production with phase change materials (PCMs) improves the thermal properties of concrete. PCMs are used for thermal energy storage with the capacity to absorb and release heat energy. PCMs such as paraffins, fatty acids or hydration salts are encapsulated in small capsules by microencapsulation and added to the concrete mix. This method ensures homogenous distribution of the PCM in the concrete and reduces the risk of leakage. The micro-encapsulated PCM is added to the foam concrete mix and all components are thoroughly mixed. The mixture is poured into molds and left to cure. The capsules of PCMs are generally artificially produced from inorganic materials such as polymers, silica and alumina and metal oxides.

[0007] AIM OF THE INVENTION

[0008] The aim of the invention is to produce a building material with low thermal conductivity by using pumice-encapsulated soy wax phase change material in the production of foam concrete. Thus, heat loss and related energy consumption are reduced with this material, which has a lower thermal conductivity compared to existing foam concrete applications. Another aim of the invention is to increase comfort by stabilizing the temperatures in the building interiors. It is aimed to develop and popularize innovative and heat efficient insulation materials that provide these advantages in foam concrete.

[0009] DETAILED DESCRIPTION OF THE INVENTION

[0010] The invention relates to a foam concrete product with pumice encapsulated soya wax phase change material and a method of production of this product.

[0011] The first building material used in the invention is pumice aggregate. This aggregate is a natural and valuable material with a wide range of uses due to its lightweight, highly porous structure and chemically inactive properties. Soy wax, another ingredient, is a vegetable-based wax type obtained from soy. This type of wax is more environmentally friendly as it has a biodegradable structure compared to petroleum-based waxes. In addition, it can store or release large amounts of heat energy during phase change (solid to liquid or liquid to solid transition). Soy wax, on the other hand, can help regulate the ambient temperature by storing or releasing large amounts of energy at the melting point. Due to these properties, these two building materials were preferred as structural elements in the production of foam concrete in our invention. The porous structure of pumice acts as a natural and protective capsule for soya wax. When soya wax is used in foam concrete production, it increases the heat energy storage and release capacity of the material. In addition, since they are renewable and do not contain toxic materials, they will enable the production of more sustainable foam concrete.

[0012] In the inventive production method, firstly, pumice aggregate particles (2 mm-4 mm) were dried and the temperature was kept constant at 105°C for 24 hours. After this drying step, solid soya wax used as phase change material was melted at 44°C until it became a homogeneous liquid. The melted solid soya wax was then mixed with the lightened pumice aggregate particles. The mixing process was carried out continuously for 2 hours. This ensured a good dispersion of the phase change material in the pore system of the pumice aggregate. After mixing, the mixture was allowed to cool at room temperature to form an aggregate in which the phase change material was adsorbed. In the next step, spray adhesive was applied 3 times following 30 minutes waiting periods at room temperature to form a protective shell around the lightweight pumice aggregate particles containing phase change material. The purpose of the waiting period was to allow the sprayed coating adhesive to dry and allow better adhesion of the next layer. After complete drying of the adhesive, the pumice aggregate particles were moistened by water spraying and covered with a thin layer of cement. The final moistening and cement coating process was carried out once a day for 7 days. The reason for the protective layers formed with spray adhesive and cement is to prevent leakage due to cracking in the aggregates produced during the production of foam concrete and to provide a better bond with the cement paste. In addition, pumice aggregate increases the lightness of the concrete, while soya wax PCMs help to stabilize temperature fluctuations inside the building by storing and releasing heat energy during phase change. Soy wax is derived from soya beans, an environmentally friendly and renewable resource. This makes it a sustainable material. Pumice capsules ensure a more homogeneous distribution and stability of the soya wax PCMs in the concrete. This innovative combination of materials creates an energy-efficient, environmentally friendly building material that can be used in a variety of applications. Pumice-encapsulated soy wax phase change material foam concrete offers significant advantages in building insulation with its light weight and superior thermal performance.

[0013] The thermal conductivity coefficient of currently produced foam concretes is 0.20 W / mK on average (for 25 cm thick block). The thermal conductivity coefficient of foam concrete with pumice-encapsulated soya wax phase change material produced by the inventive method is 0.14 W / mK (for 5 cm). These results show that the product subject to our invention can significantly reduce heat loss in buildings when used as insulation material under appropriate conditions.

Claims

CLAIMS1. A foam concrete with phase change material (PCM), characterized by comprising soya wax impregnated pumice aggregate coated with a cement layer.

2. A method of producing foam concrete with phase change material (FDM) characterized by comprising the steps below;- Drying of pumice aggregate particles,- Melting solid soya wax used as phase change material until a homogeneous liquid,- Mixing melted solid soya wax with dried pumice aggregate particles,- Allow the mixture to cool at room temperature,- Application of spray adhesive to form a protective shell around lightweight pumice aggregate particles containing phase change material,- moistening the pumice aggregate particles by water spraying and coating with a layer of cement after the adhesive has completely dried.

3. The method for producing foam concrete with phase change material (FDM) according to Claim 2, characterized by the temperature applied in the step of drying the pumice aggregate particles is 105°C and the application time is 24 hours.

4. The method for producing foam concrete with phase change material (FDM) according to Claim 2, characterized by the temperature applied in the step of melting the solid soya wax used as phase change material until it becomes a homogeneous liquid is 44°C.

5. The method for producing foam concrete with phase change material (FDM) in accordance with Claim 2, characterized by the step of applying a spray adhesive to form a protective shell around the lightweight pumice aggregate particles containing the phase change material is performed 3 times following a waiting time of 30 minutes each.

6. The method for producing foam concrete with phase change material (FDM) according to Claim 2, characterized by, after the adhesive has completely dried,the step of moistening the pumice aggregate particles by water spraying and covering them with a layer of cement is applied once a day for 7 days.