Green light-weight high-strength glass concrete and preparation method thereof

Abstract

Belonging to the technical field of concrete manufacturing, the invention discloses a green light high strength glass concrete, which is composed of the following substances by weight: 330-360 parts of cement, 160-200 parts of silica fume, 340-360 parts of glass powder, 200-240 parts of glass slag, 500-520 parts of shale ceramsite, 110-130 parts of water, 25-28 parts of a water reducer, 4-6 parts of sodium hydroxide, and 8-10 parts of sodium silicate. According to the green concrete material, solid waste is effectively utilized, the heat conductivity coefficient of the prepared concrete material is remarkably lower than that of a common concrete material, building carbon emission is expected to be greatly reduced after large-scale engineering application in the future, and the challenge of sustainable development in the field of civil engineering is effectively coped with.

Description

Technical Field

[0001] This invention belongs to the field of concrete manufacturing technology, specifically relating to a green, lightweight, high-strength glass concrete and its preparation method. Background Technology

[0002] Concrete is the most widely used and consumed building material in the world today. According to a report by the International Energy Agency (IEA), civil engineering projects account for 30-34% of global energy consumption and approximately 37-40% of carbon emissions. In response to the long-term strategy of low-carbon and environmental protection, the construction industry urgently needs to transform, and building materials should develop towards green, low-carbon, lightweight, high-strength, energy-saving, and environmentally friendly directions. Traditional concrete and its derivative materials have the following drawbacks in terms of performance and resource consumption: 1. Ordinary concrete is heavy, energy-intensive, and emits a large amount of carbon, which runs counter to the concept of sustainable development and makes it impossible to maintain the development goal of harmony between humans and nature. The density of ordinary concrete is typically between 2300-2500 kg / m³, resulting in excessive structural weight. This significantly limits its application in ultra-large span and high-rise structures and greatly increases the dead load on buildings. Simultaneously, it is prone to shrinkage cracks, carbonation, and steel corrosion, affecting structural durability and service life. More importantly, the production process of its core cementitious material—cement—is one of the major sources of carbon emissions in the civil engineering field, with carbon dioxide emissions reaching 300-400 kg per cubic meter of concrete. Furthermore, the preparation of ordinary concrete requires a large amount of natural sand and gravel aggregate. With the gradual depletion of natural river sand resources in my country and the massive emissions of greenhouse gases leading to drastic global climate change, the original development concept of concrete materials is no longer sustainable.

[0003] 2. Various new types of concrete developed to overcome the shortcomings of traditional concrete still have their own drawbacks: (1) Although ultra-high performance concrete (UHPC) has significantly improved mechanical properties, the high-strength cement, steel fiber, and quartz sand aggregates in the material lead to high costs and a significant increase in energy consumption. Furthermore, UHPC has a higher density than ordinary concrete, and while strength has increased, it has not effectively solved the fundamental problem of excessive weight. In addition, UHPC concrete faces the challenge of being difficult to recycle and reuse in the future. (2) Traditional lightweight aggregate concrete achieves weight reduction by using artificial or natural lightweight aggregates, but it generally suffers from poor workability and low mechanical strength (especially tensile and compressive strength), making it difficult to meet the requirements of load-bearing structures. (3) Geopolymer concrete (which does not use cement and uses waste minerals, fly ash, slag, etc. as the main admixtures) has environmental value, but it often faces problems such as poor mechanical strength, high density, complex solid waste sources, and unstable and fluctuating performance, affecting the requirements for material homogeneity and reliability in large-scale engineering applications of concrete materials.

[0004] Waste glass is a common type of municipal solid waste. In 2024, China's annual waste glass production reached 23.466 million tons, with a recycling rate of 46.88%, meaning a large amount of waste glass remains unutilized. Waste glass is chemically stable and difficult to degrade naturally; currently, the main disposal method is landfill. Therefore, waste glass disposal has become a significant environmental challenge. Summary of the Invention

[0005] The purpose of this invention is to provide a green, lightweight, and high-strength glass concrete, which makes good and reasonable use of waste glass materials, incorporating them into the concrete and, together with the addition of other components, effectively improves the quality of the concrete and is also beneficial to environmental protection.

[0006] A green, lightweight, high-strength glass concrete is composed of the following substances in corresponding weight parts: 330-360 parts cement, 160-200 parts silica fume, 340-360 parts glass powder, 200-240 parts glass slag, 500-520 parts shale ceramsite, 110-130 parts water, 25-28 parts water-reducing agent, 4-6 parts sodium hydroxide, and 8-10 parts sodium silicate.

[0007] Preferably, it is composed of the following substances in corresponding parts by weight: 348 parts cement, 188 parts silica fume, 348 parts glass powder, 220 parts glass slag, 513 parts shale ceramsite, 124 parts water, 26 parts water-reducing agent, 5 parts sodium hydroxide, and 9 parts sodium silicate.

[0008] Furthermore, the cement is PO52.5 strength grade cement.

[0009] Furthermore, the glass powder has a particle size of 1250 mesh.

[0010] Furthermore, the glass slag has a particle size of 8-50 mesh.

[0011] Furthermore, the shale ceramsite is grade 800 crushed fine shale ceramsite.

[0012] Furthermore, the water-reducing agent is a polycarboxylate-type water-reducing agent, which appears as a white powder and has a water reduction rate of 25%; the sodium silicate is a liquid sodium silicate with a Baumé degree of 40 and a modulus of 3.2.

[0013] A method for preparing green, lightweight, high-strength glass concrete includes the following steps: (1) First, mix sodium hydroxide, sodium silicate and water to prepare an alkaline activator solution for later use; (2) Mix cement, silica fume, glass powder, glass slag and shale ceramsite evenly, then add water-reducing agent and stir. Finally, add the alkali activator solution prepared in step (1) and stir evenly.

[0014] The beneficial effects of this invention are: This invention, by fully utilizing waste glass materials and rationally compounding shale ceramsite as fine aggregate, prepares a lightweight, high-strength, thermally insulating, and noise-reducing green concrete material. By replacing shale ceramsite with an appropriate amount of glass slag, the amount of glass powder slag is increased while mitigating the problem of alkali-aggregate reaction in glass aggregates. An alkaline activation solution prepared by adding a certain concentration of sodium hydroxide and sodium silicate is used to activate the pozzolanic activity of the glass powder, thereby increasing the glass powder content. This green concrete material not only effectively utilizes solid waste but also has a significantly lower thermal conductivity than ordinary concrete. Its large-scale engineering application in the future is expected to significantly reduce building carbon emissions and effectively address the challenges of sustainable development in the civil engineering field. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the slump and spread performance data corresponding to Embodiment 2 of the present invention and Patent 1 and Patent 2.

[0016] Figure 2 This is a schematic diagram showing the compressive strength performance data corresponding to Embodiment 2 of the present invention and Patent 1 and Patent 2.

[0017] Figure 3 This is a schematic diagram showing the strength-to-weight ratio performance data corresponding to Embodiment 2 of the present invention and Patent 1 and Patent 2. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail with reference to the accompanying drawings, examples, and comparative examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0019] Example 1: A green, lightweight, high-strength glass concrete, composed of the following substances in corresponding weight parts: 330 parts cement, 160 parts silica fume, 340 parts glass powder, 200 parts glass slag, 500 parts shale ceramsite, 110 parts water, 25 parts water-reducing agent, 4 parts sodium hydroxide, and 8 parts sodium silicate.

[0020] Example 2: A green, lightweight, high-strength glass concrete, composed of the following substances in corresponding weight parts: 348 parts cement, 188 parts silica fume, 348 parts glass powder, 220 parts glass slag, 513 parts shale ceramsite, 124 parts water, 26 parts water-reducing agent, 5 parts sodium hydroxide, and 9 parts sodium silicate.

[0021] Example 3: A green, lightweight, high-strength glass concrete, composed of the following substances in corresponding weight parts: 360 parts cement, 200 parts silica fume, 360 parts glass powder, 240 parts glass slag, 520 parts shale ceramsite, 130 parts water, 28 parts water-reducing agent, 6 parts sodium hydroxide, and 10 parts sodium silicate.

[0022] The cement used in the above embodiments is all PO52.5 strength grade cement, conforming to the current national standard GB / T175-2023 "General Portland Cement". The glass powder particle size is all 1250 mesh. The glass slag particle size is all 8-50 mesh. The shale ceramsite is all 800 grade crushed stone type fine shale ceramsite, conforming to the construction sand standard GB / T14684-2022. The water-reducing agent is all polycarboxylate type water-reducing agent, appearing as a white powder with a water reduction rate of 25%; conforming to the relevant requirements of GB 8076-2008 "Concrete Admixtures". The sodium silicate is all liquid sodium silicate with a Baumé degree of 40 and a modulus of 3.2. The water used is all tap water, meeting the requirements of GB / T 6682-2008 "Specifications and Test Methods for Water Used in Analytical Laboratories". The sodium hydroxide used conforms to the current national standard GB / T 629-1997, with a purity of over 98%.

[0023] Example 4: A method for preparing green, lightweight, high-strength glass concrete, comprising the following steps: (1) First, mix sodium hydroxide, sodium silicate and water to prepare an alkaline activator solution for later use; (2) Mix cement, silica fume, glass powder, glass slag and shale ceramsite evenly, then add water-reducing agent and stir. Finally, add the alkali activator solution prepared in step (1) and stir evenly.

[0024] When preparing concrete components or specimens, the above-mentioned mixture, after being stirred evenly, is introduced into the mold and vibrated for 40-60 seconds to remove internal air (preferably no more than 60 seconds to avoid the shale ceramsite floating and affecting internal uniformity). Then, wait 1-2 days for it to harden and be demolded, and finally carry out curing treatment.

[0025] In actual preparation, the shale ceramsite can be pre-wetted with water to facilitate subsequent stirring and dispersion. The amount of water should be 15% of the total mass of the shale ceramsite. The alkali activator solution should preferably be prepared one day in advance, with a concentration controlled at 0.6 mol / L.

[0026] To further compare the effects of the present invention, invention patent 1 (publication number: CN116283349A) was selected as comparative example 1; invention patent 2 (publication number: CN114907074A) was selected as comparative example 2; and then the concrete corresponding to the above embodiment 2 of the present invention was used for performance comparison.

[0027] Comparative Example 1 The performance data disclosed in the specification of invention patent 1 is shown in Table 1 below: Table 1 ; For the sake of rationality, the index data corresponding to Embodiment 1 in Invention Patent 1 is specifically selected as representative.

[0028] Comparative Example 2 The performance data disclosed in the specification of invention patent 2 is shown in Table 2 below: Table 2 ; For the sake of rationality, the index data corresponding to Embodiment 1 in Invention Patent 2 is specifically selected as representative.

[0029] Then, the quality of the concrete corresponding to Example 2 of this application was compared with that of the concrete. The specific comparison results are shown in Tables 3 and 4 below: Table 3 ; Table 4 ; Compared with invention patent 1, the compressive strength of this invention is increased by 59.5%; compared with invention patent 2, the compressive strength of this invention is increased by 196%. Specific mechanical performance indicators are shown in Table 4, and attached... Figure 1 Appendix Figure 2 Appendix Figure 3 As shown. Overall, this invention exhibits excellent mechanical properties and a high strength-to-weight ratio. The strength-to-weight ratio of this invention is 0.052, while the strength-to-weight ratios of existing invention patents 1 and 2 are 0.032 and 0.014, respectively, and the strength-to-weight ratio of ordinary concrete is 0.016. The strength-to-weight ratio of this invention is 1.6 times and 3.7 times that of invention patents 1 and 2, respectively, and 3.1 times that of C40 ordinary concrete. Its comprehensive performance is significantly better than that of ordinary concrete and existing invention patents (Note: The strength-to-weight ratio is the ratio of compressive strength to the density of the material; a higher ratio indicates better comprehensive performance of the material).

[0030] This invention increases the amount of waste glass in concrete by replacing part of the cement with glass powder and part of the shale ceramsite with glass slag, thereby improving the utilization rate of waste glass, promoting the recycling of urban waste glass, and providing a new approach to waste glass disposal, reducing landfill waste glass and thus mitigating pollution to land resources. It also effectively reduces the thermal conductivity of concrete, improving its thermal insulation performance. This invention reduces the use of high-energy-consuming materials such as cement in concrete, lowering carbon emissions; reduces the use of natural river sand, increasing the resource utilization of urban solid waste, improving the overall performance of materials, and alleviating the dependence of the civil engineering field on natural resources.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A green, lightweight, high-strength glass concrete, characterized in that, It is composed of the following substances in corresponding parts by weight: 330-360 parts cement, 160-200 parts silica fume, 340-360 parts glass powder, 200-240 parts glass slag, 500-520 parts shale ceramsite, 110-130 parts water, 25-28 parts water-reducing agent, 4-6 parts sodium hydroxide, and 8-10 parts sodium silicate.

2. The green, lightweight, high-strength glass concrete according to claim 1, characterized in that, It is composed of the following substances in corresponding parts by weight: 348 parts cement, 188 parts silica fume, 348 parts glass powder, 220 parts glass slag, 513 parts shale ceramsite, 124 parts water, 26 parts water-reducing agent, 5 parts sodium hydroxide, and 9 parts sodium silicate.

3. The green, lightweight, high-strength glass concrete according to claim 2, characterized in that, The cement is PO52.5 strength grade cement.

4. The green, lightweight, high-strength glass concrete according to claim 2, characterized in that, The glass powder has a particle size of 1250 mesh.

5. The green, lightweight, high-strength glass concrete according to claim 2, characterized in that, The glass slag has a particle size of 8-50 mesh.

6. The green, lightweight, high-strength glass concrete according to claim 2, characterized in that, The shale ceramsite is grade 800, a fine-grained crushed shale ceramsite.

7. The green, lightweight, high-strength glass concrete according to claim 2, characterized in that, The water-reducing agent is a polycarboxylate-type water-reducing agent, which appears as a white powder and has a water reduction rate of 25%; the sodium silicate is a liquid sodium silicate with a Baume degree of 40 and a modulus of 3.

2.

8. A method for preparing green, lightweight, high-strength glass concrete as described in any one of claims 1-7, characterized in that, Includes the following steps: (1) First, mix sodium hydroxide, sodium silicate and water to prepare an alkaline activator solution for later use; (2) Mix cement, silica fume, glass powder, glass slag and shale ceramsite evenly, then add water-reducing agent and stir. Finally, add the alkali activator solution prepared in step (1) and stir evenly.

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