Abstract
For the purpose of reducing the energy consumption and construction cost of buildings, the preparation process of geopolymer based foamed concrete, which is a novel material of the wall and roof of building, had been studied in detail. Water glass and sodium hydroxide were used as the alkali activator to excite the mixture consists of slag, fly ash and Kaolin to form the geopolymer matrix, and finally the foams generated using the physical foaming method were filled into the geopolymer matrix to produce geopolymer-based foamed concrete blocks. In the preparation process, firstly one of the four parameters of foam content, water-binder ratio, water glass content, and water glass modulus had been changed separately to study the influence of a single factor on the compressive strength, dry density, thermal conductivity and specific strength of foamed concrete blocks. The experimental results show that the above four factors have different degrees of influence on the concerned performances. Next, some representative combinations of these factors were constructed by orthogonal experiment method, and the influence degree of each combination on the concerned performances was determined by means of range analysis. According to the results of analysis, the most important influencing factor in terms of thermal conductivity was the water-binder ratio, followed by foam content, water glass modulus and water glass content. When the foam content is 1.58%, the water-binder ratio is 0.45, the water glass content is 30%, and the water glass modulus is 1.2, the thermal conductivity of the prepared geopolymer foam concrete reaches 0.044 W/(m·K), which satisfies the expected requirements for heating in severe cold areas.
Highlights
With the development of society and the increase of population, the problem of energy shortage has become increasingly prominent, and countries all over the world have attached great importance to energy conservation and environmental protection in the construction industry (Huang, 2013)
Sodium hydroxide, water glass and water were mixed to form an alkali activator of the required modulus; subsequently, dry materials such as Kaolin, slag and fly ash are mixed in a certain proportion and poured into a pot and stir evenly; the prepared alkali activator was poured into the uniformly mixed powder and continue stirring to form a geopolymer slurry; the prefabricated foam containing foam stabilizer was passed into a mixer filled with geopolymer slurry and quickly stirred for about 45 s to form a paste-like foamed concrete
The performance of geopolymer-based foam concrete is affected by foam content, water-binder ratio, water glass content and water glass modulus
Summary
With the development of society and the increase of population, the problem of energy shortage has become increasingly prominent, and countries all over the world have attached great importance to energy conservation and environmental protection in the construction industry (Huang, 2013). With the strong support of these favorable policies, reforms in the construction sector have been deepened, and significant progress has been made in the research of building energy-saving technologies and building energy-saving materials (Chang et al, 2016). Organic materials have the advantages of light weight and low thermal conductivity, which made them favored by the market. The intensification of fires caused by the inflammable insulation of the exterior wall of buildings such as this occurs many times a year, seriously endangering national health and economic construction. Inorganic materials represented by foamed concrete have gradually become a research hotspot in the field of building materials (Yang et al, 2021)
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