scholarly journals Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1750 ◽  
Author(s):  
Xi Peng ◽  
Qin Shuai ◽  
Han Li ◽  
Qin Ding ◽  
Yan Gu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Physical Properties ◽  
Fire Resistance ◽  
Coal Fly Ash ◽  
Structure Stability ◽  
Dry Density ◽  
Porous Blocks ◽  
Resistance Tests ◽  
Skeleton Structure

This paper aims to investigate the influence of coal fly ash (CFA) addition on the fireproof properties of the metakaolin-based geopolymer foams. The physical properties, thermal conductivity and fire resistance of the CFA-metakaolin-based geopolymer foams are discussed. The CFA-metakaolin-based geopolymer foams achieve a dry density between 259.43 kg/m3 and 349.73 kg/m3, a porosity between 71.78% and 72.98%, a thermal conductivity between 0.0871 W/(m·K) and 0.0944 W/(m·K) and a compressive strength between 0.38 MPa and 0.56 MPa, exhibiting better physical properties than that of the porous blocks without CFA addition. It is also found that the CFA addition could decrease the viscous sintering temperature and change the phase compositions of sintering products, resulting in the porous structure deterioration in a certain extent and obvious rise of the final reverse-side temperature during the fire-resistance tests. Fortunately, the conversion of the amorphous geopolymer gel to ceramics has helped to maintain the main skeleton structure stability. The CFA-metakaolin-based geopolymer foams still exhibit excellent fire resistance, and the reverse-side temperatures are always within 250 °C after 3 h fire-resistance tests.

The Effect of Substituting Rdf on the Physical and Environmental Properties of Coal Fly Ash

1988 ◽  
Vol 136 ◽  
Author(s):  
Ashaari B. Mohamad ◽  
David L. Gress
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Activity Index ◽  
Coal Fly Ash ◽  
Pozzolanic Activity ◽  
Portland Cement Concrete ◽  
Fly Ash Concrete ◽  
Refuse Derived Fuel ◽  
Cadmium And Lead

ABSTRACTRefuse-derived-fuel (RDF) consisting mainly of waste paper and plastics is a viable fuel source for the production of power. An experimental test burn partially substituting coal with RDF was undertaken by the Public Service of New Hampshire at the Merrimack Power Station.Five percent and ten percent RDF were substituted, on a BTU basis, for coal in the test bums. The chemical and physical properties of the resulting fly ash were determined. Twelve test burn days were run with 4 days of 5% RDF and 8 days of 10% RDF. Emphasis was placed on investigating the effect of the RDF fly ash on Portland cement concrete.Most of the chemical and physical properties of the coal-RDF fly ash were found to be comparable with ordinary coal fly ash except for the amount of cadmium and lead, the pozzolanic activity index and the compressive strength of fly ash concrete. Cadmium and lead were at average levels of 5.1 ppm and 102.6 ppm for the 5% RDF, and 7.8 ppm and 198.3 ppm for the 10% RDF, respectively. Although the pozzolanic activity index of coal-RDF fly ash increases over normal coal fly ash, preliminary results show that the 28-day compressive strength of concrete with direct replacement of cement and sand decreases by up to 30%. Leaching tests on crushed concrete were conducted to evaluate the environmental effect of acid rain.

Use of Zeolitized Coal Fly Ash as Main Component in Panels with High Fire Resistance

2018 ◽  
Vol 115 (3) ◽  
Author(s):  
C. Leiva ◽  
C. Arenas ◽  
L. F. Vilches ◽  
F. Arroyo ◽  
Y. Luna-Galiano ◽  
...  
Keyword(s):  
Fly Ash ◽  
Fire Resistance ◽  
Coal Fly Ash ◽  
Main Component

Effect of carbonaceous matter contents on the fire resistance and mechanical properties of coal fly ash enriched mortars

Fuel ◽  
2008 ◽  
Vol 87 (13-14) ◽  
pp. 2977-2982 ◽  
Author(s):  
C LEIVA ◽  
L VILCHES ◽  
J VALE ◽  
J OLIVARES ◽  
C FERNANDEZPEREIRA
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Fire Resistance ◽  
Coal Fly Ash ◽  
Carbonaceous Matter

Environmentally Friendly Cellular Concrete for Wall Insulation

2013 ◽  
Vol 539 ◽  
pp. 271-275 ◽  
Author(s):  
Ya Qing Jiang ◽  
Jun Yang ◽  
Yun Chen
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Mass Density ◽  
Polypropylene Fiber ◽  
Cementitious Materials ◽  
Dry Density ◽  
Insulation Material ◽  
Good Market ◽  
Cellular Concrete

Cellular concrete characterizes low mass density and low thermal conductivity is one of the durable and economic wall insulation materials which have good market prospects. The present paper investigated the composition of ternary cementitious materials, mixture design and production process of cellular concrete panel (CCP). Experimental results indicated that a higher compressive strength of CCP may be obtained by blended PⅡ52.5 Portland cement with pulverized low temperature clinker (PLWC) made of water treatment sludge and fly ash in the mass ratio of 0.70: 0.15: 0.15. CCP with dry density of 226 kg/m3, thermal conductivity of 0.056 W/ (m•K), compressive strength of 0.6 MPa and water absorption ratio of 7.6 vol. % was modified by high range water reducer, polypropylene fiber and water resistant agent. Mathematic models for controlling temperature of mixing water and for calculation quantity of gas forming admixture were established. Insulated moulds were specially designed for taking advantage of hydration heat of cement to speed up moulds turnover. Meanwhile, internal microcrack of CCP was avoided. CCP incorporating PLWC and fly ash may be used as external insulation material of walls.

Research on the Foamed Concrete with High Volume Fly Ash

2017 ◽  
Vol 727 ◽  
pp. 1062-1066
Author(s):  
Hui Chao Chu ◽  
Xian Jun Lyu ◽  
Yan Zhang
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Process Parameters ◽  
High Volume ◽  
Dry Density ◽  
High Volume Fly Ash ◽  
Foamed Concrete

A study has been undertaken to investigate the effects, on the properties of foamed concrete, of replacing large volumes of cement with fly ash. This paper reports the results of the properties of foamed concrete and shows that up to 55% of the cement could be replaced without any significant reduction in compressive strength. Foamed concrete with 55% fly ash and good performance were obtained by optimizing the process parameters. The results showed that the compressive strength, dry density, water absorption and thermal conductivity of foamed concrete with 55% fly ash were 0.71MPa, 244kg/m3, 33%, and 0.045 W/mK respectively.

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