scholarly journals Preparation of Ultrafine Fly Ash-Based Superhydrophobic Composite Coating and Its Application to Foam Concrete

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2187
Author(s):  
Huiping Song ◽  
Mingxiu Tang ◽  
Xu Lei ◽  
Zhengjun Feng ◽  
Fangqin Cheng
Keyword(s):  
Fly Ash ◽  
Composite Coating ◽  
Water Drop ◽  
Heat Conductivity Coefficient ◽  
Foam Concrete ◽  
Large Area ◽  
Sliding Angle ◽  
Insulation Property ◽  
Foamed Concrete ◽  
Thermal Insulation Property

The waterproof and thermal insulation property of foamed concrete is very important. In this study, the ultrafine fly ash (UFA)-based superhydrophobic composite coating was applied onto foam concrete. The UFA-based base coating that closely adhered to the concrete initially improved the waterproofness of the test block, and the silane coupling agent-modified UFA-based surface coating further achieved superhydrophobicity. The UFA on the coating surface and the asperities on the surface jointly formed a lotus leaf-like rough micro–nanostructure. The 154.34° water drop contact angle and 2.41° sliding angle on No. 5 coating were reached, indicating that it was a superhydrophobic surface. The water absorption ratios of the composite coating block were 1.87% and 16.6% at 4 h and 7 days, which were reduced by 97% and 75% in comparison with the original foam concrete. The compressive strength and heat conductivity coefficient after soaking for 4 h of the composite coating block were higher than 4.0 MPa and 0.225 W·m−1·K−1, respectively. The UFA-based superhydrophobic composite coating proposed in this study and applied onto foam concrete is simple and cheap, requires no precise instrument, and can be applied in a large area.

Study on Properties of Foam Concrete Based on Fractal Theory

2011 ◽  
Vol 194-196 ◽  
pp. 1916-1919 ◽  
Author(s):  
Wen Ling Tian ◽  
Jiang Bo Yang ◽  
Xiao Yan Zhao
Keyword(s):  
Fractal Dimension ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Fractal Theory ◽  
High Strength ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Thermal Insulation Property

Foam concrete is provided with light weight, thermal insulation, sound insulation and fire resistance, good seismic performance and other characteristics. To improve properties of foam concrete microstructure is studied with the help of fractal theory, fractal dimension related to mechanical properties and thermal performance of foam concrete is calculated by MATLAB language program. The results indicate that the microstructure of foam concrete showed significant fractal character, the fractal dimension is between 1.3 and 2.0. Apparent density, 28d compressive strength, and thermal conductivity decreases with the increase of fly ash and foaming agent content, fractal dimension increased. Formulas of fractal dimension and the fly ash, foaming agent content were established. Foam concrete with low density, high strength, and good thermal insulation property will be prepared conducted by the formulas.

Influences of Polypropylene Fiber on Properties of Foam Concrete with Iron Tailings

2014 ◽  
Vol 1004-1005 ◽  
pp. 1575-1578
Author(s):  
Li Guang Xiao ◽  
Chang Liu ◽  
Shi Ting Zhang
Keyword(s):  
Crack Resistance ◽  
Frost Resistance ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Pore Wall ◽  
High Porosity ◽  
Foam Concrete ◽  
Insulation Property ◽  
Industrial Processing ◽  
Thermal Insulation Property

Iron tailings are mineral wastes obtained from industrial processing and magnetic separation of iron ore. Foam concrete with iron tailings can be made with iron tailings, cement, fly ash, silica fume, polypropylene fiber, superplasticizer, early strength agent, accelerating agent and foaming agent. The influences of polypropylene fiber on the crack resistance and frost resistance of foam concrete have been investigated in this study. Further, the microstructure of foam concrete was observed. This result demonstrates that polypropylene fiber has greatly increased the crack resistance and frost resistance of foam concrete. The pore structure of foam concrete is improved obviously by polypropylene fiber. Due to the uniformly distributed pores, high porosity and rather complete pore wall, the mechanical properties and thermal properties of foam concrete are excellent. The foam concrete with high-strength and excellent thermal insulation property develops a new route for the comprehensive utilization of iron tailings.

Influences of Admixtures on Properties of Foam Concrete with Iron Tailings

2014 ◽  
Vol 599 ◽  
pp. 61-65 ◽  
Author(s):  
Li Guang Xiao ◽  
Chang Liu ◽  
Shi Ting Zhang ◽  
Wen Bin Wang
Keyword(s):  
Iron Ore ◽  
Polypropylene Fiber ◽  
High Strength ◽  
High Water ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Industrial Processing ◽  
Early Strength ◽  
Thermal Insulation Property

Iron tailings are mineral wastes obtained from industrial processing and magnetic separation of iron ore. A type of superplasticizer with high water reducing rate and early strength gaining property is characterized in this study. The influence of admixtures, i.e. superplasticizer, early strength agent and accelerating agent, on the mechanical strength, setting and hardening time of foam concrete containing iron tailings has been investigated. Further, the microstructure of foam concrete is observed. This study demonstrates high-strength foam concrete with excellent thermal insulation property can be prepared using iron tailings, cement, fly ash, silica fume, polypropylene fiber, superplasticizer, early strength agent, accelerating agent and foaming agent, which develops a new route for the comprehensive utilization of iron tailings.

The Steel Slag Fly Ash Foamed Concrete Thermal Properties

2016 ◽  
Vol 852 ◽  
pp. 1398-1403
Author(s):  
Shui Jun Yu ◽  
Bin Li ◽  
Xiao Li Chen
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Fly Ash ◽  
Specific Heat ◽  
General Model ◽  
Steel Slag ◽  
Industrial Emissions ◽  
Foam Concrete ◽  
Coefficient Of Thermal Conductivity ◽  
Foamed Concrete

Industrial emissions used as admixture in foam concrete not only save resources, but also improve the properties of foam concrete. In this paper the thermal properties of steel slag fly ash foamed concrete was studied through experiments, and the results were analyzed. This paper included several of them and validated them using test dates, compared the results with other researchers. The result is the general model can predict the thermal conductivity of foam concrete better. Maxwell-Eucken model can regard as the boundaries’ formula to predict the coefficient of thermal conductivity of foam concrete and determine the limits. For the same density with the increasing of the steel slag thermal conductivity increases, specific heat decreases. The porosity is linear to the density of foam concrete.

scholarly journals Temperature Effect on the Thermal Conductivity of Expanded Polystyrene Foamed Concrete: Experimental Investigation and Model Correction

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Jinyan Shi ◽  
Yuanchun Liu ◽  
Baoju Liu ◽  
Dan Han
Keyword(s):  
Thermal Conductivity ◽  
Volume Fraction ◽  
Expanded Polystyrene ◽  
Effect Of Temperature ◽  
Dry Density ◽  
Insulation Property ◽  
Different Temperatures ◽  
Foamed Concrete ◽  
Thermal Insulation Property ◽  
The Impact

In this research, ultralightweight expanded polystyrene foamed concrete (EFC) was made by the chemical foaming method, and its thermal insulation property was measured by the transient method at different environment temperatures (from −10 to 40°C). Then, the effect of temperature and EPS volume fraction on the thermal conductivity and dry density of EFC were observed. Ultimately, the Cheng–Vachon equation was modified by introducing the temperature parameter. The results indicated that EFC thermal conductivity decreases with increasing temperature. It was also demonstrated that the suitable volume of EPS particles can not only decrease the EFC thermal conductivity but also reduce the impact of temperature on the thermal conductivity. The thermal conductivity of EFC at different temperatures was accurately predicted in this study using the proposed model.

The effect of foam and fly ash percentage on properties of foamed concrete

2021 ◽  
Author(s):  
M. Agung Prasetyo J. ◽  
Saloma ◽  
Hanafiah ◽  
Ika Juliantina ◽  
M. Lindung Persada P. W.
Keyword(s):  
Fly Ash ◽  
Foamed Concrete

The influence of wet ground fly ash on the performance of foamed concrete

2021 ◽  
Vol 304 ◽  
pp. 124676
Author(s):  
Guangyan Li ◽  
Hongbo Tan ◽  
Xingyang He ◽  
Junjie Zhang ◽  
Xiufeng Deng ◽  
...  
Keyword(s):  
Fly Ash ◽  
Foamed Concrete ◽  
Wet Ground
Sign in / Sign up

Export Citation Format

Share Document