Development of cementless binder for low thermal conductivity materials: Reactive ultra-fine fly ash mixed with co-fired fly ash
Source abstract
Abstract
Low thermal conductivity materials are now an essential direction for construction material applications as the public has become more aware of global warming over the past few years. The development of cementless binders is also helping to improve the problem of global warming. This study uses reactive ultra-fine fly ash (RUFA) and co-fired fly ash (CFA) to develop an innovative cementless binder. The RUFA-CFA mixture undergoes hardening without alkali activators at a temperature of 50 °C before it is de-molded for air curing. The resulting lightweight cementless specimens present excellent thermal insulation, mainly due to the formation of interstitial pores between RUFA particles. The porosity of RUFA-CFA cementless specimens ranges from 41% to 50% with minimum thermal conductivity of 0.10 W/m·K. Our analysis reveals that the ultra-fine RUFA particles adhere to the CFA surface formed C-S-H colloids and ettringite via continuous hydrated reactions maintained by the CFA. The results obtained in this study provide a valuable reference for developing cementless composites based on industrial waste materials.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (71)
Show source-provided references
1. Rheology of alkali-activated materials: a review10.1016/j.cemconcomp.2021.104061 ↗
2. Editorial for special issue: alkali activated materials: advances, innovations, future trends10.3390/min11010075 ↗
3. Eco-friendly geopolymer materials: a review of performance improvement, potential application and sustainability assessment10.1016/j.jclepro.2021.127085 ↗
4. Chemical research and climate change as drivers in the commercial adoption of alkali activated materials10.1007/s12649-010-9015-9 ↗
5. Reaction products, structure and properties of alkali-activated metakaolin cements incorporated with supplementary materials – a review10.1016/j.jmrt.2018.07.006 ↗
6. A review on alkali-activated slag cements incorporated with supplementary materials
7. One-part alkali-activated materials: a review10.1016/j.cemconres.2017.10.001 ↗
8. Compressive strength development and durability of an environmental load-reduction material manufactured using circulating fluidized bed ash and blast-furnace slag10.1016/j.conbuildmat.2017.04.042 ↗
9. Utilizing residues of CFB co-combustion of coal, sludge and TDF as an alkali activator in eco-binder10.1016/j.conbuildmat.2015.01.062 ↗
10. Composite properties of non-cement blended fiber composites without alkali activator10.3390/ma13061443 ↗
11. Compressive strength, resistance to chloride-ion penetration and freezing/thawing of slag-replaced concrete and cementless slag concrete containing desulfurization slag activator
12. Green concrete with ground granulated blast-furnace slag activated by desulfurization gypsum and electric arc furnace reducing slag10.1016/j.jclepro.2020.122212 ↗
13. Development of a new cementless binder for controlled low strength material (CLSM) using entirely by-products10.1016/j.conbuildmat.2019.02.088 ↗
14. Waste-based pervious concrete for climate-resilient pavements10.3390/ma11060900 ↗
15. Effect of circulating fluidized bed combustion ash on the properties of roller compacted concrete10.1016/j.cemconcomp.2013.10.001 ↗
16. Waste-to-resource strategies for the use of circulating fluidized bed fly ash in construction materials: a mini review10.1016/j.powtec.2021.08.035 ↗
17. Reactive ultra-fine fly ash as an additive for cement-based materials
18. Comparative analysis between fly ash geopolymer and reactive ultra-fine fly ash geopolymer10.46604/ijeti.2021.7129 ↗
19. Effect of NaOH concentration on properties and microstructure of a novel reactive ultra-fine fly ash geopolymer10.1016/j.apt.2021.06.008 ↗
20. Comparison of lightweight aggregate and foamed concrete with the same density level using image-based characterizations10.1016/j.conbuildmat.2019.03.270 ↗
21. Synthesis of sustainable lightweight foamed concrete using palm oil fuel ash as a cement replacement material
22. Preparation and characterization of ultra-lightweight foamed concrete incorporating lightweight Aggregates10.3390/app9071447 ↗
23. Effects of foaming agent type on the workability, drying shrinkage, frost resistance and pore distribution of foamed concrete10.1016/j.conbuildmat.2018.08.019 ↗
24. Air-void size distribution of cement based foam and its effect on thermal conductivity10.1016/j.conbuildmat.2017.05.114 ↗
25. Thermal conductivity of hydrated paste in cement-based foam microstructure10.1520/ACEM20160081 ↗
26. Wood ash as a supplementary cementing material in foams for thermal and acoustic insulation10.1016/j.conbuildmat.2019.04.174 ↗
27. A new type of light magnesium cement foamed material10.1016/S0167-577X(02)00484-6 ↗
28. Lightweight cementless composite of CaO-CaCl2-CaSO4-activated GGBFS developed as an alternative to lightweight gypsum composite10.1016/j.conbuildmat.2020.121065 ↗
29. EN 998-1
30. Effect of microwave curing on the construction properties of natural soil based geopolymer foam10.1016/j.conbuildmat.2019.117074 ↗
31. Microstructure and mechanical, physical and structural properties of sustainable lightweight metakaolin-based geopolymer cements and mortars employing rice husk10.1080/21870764.2019.1606140 ↗
32. Hybrid geopolymeric foams with diatomite addition: effect on chemico-physical properties10.1177/0021955X17695092 ↗
33. Development and characterization of thermal insulation geopolymer foams based on fly ash10.46604/peti.2020.5291 ↗
34. Recycling of silicon carbide sludge on the preparation and characterization of lightweight foamed geopolymer materials10.3390/polym13224029 ↗
35. Properties of controlled low strength material with circulating fluidized bed combustion ash and recycled aggregates10.3390/ma11050715 ↗
36. Nano-montmorillonite modified foamed paste with a high volume fly ash binder10.1039/C6RA26968K ↗
37. Effect of fine particles on strength and stiffness of cement treated sand10.1007/s10035-019-0975-6 ↗
38. Ultrafine portland cement performance10.3989/mc.2018.03317 ↗
39. Effect of the addition of wood shavings on the thermal conductivity of the sand concretes – experimental study and modelling10.1016/j.conbuildmat.2005.12.008 ↗
40. Characterization of lightweight mortars containing wood processing by-products waste10.1016/j.conbuildmat.2016.07.011 ↗
41. Restraining effect of aggregates on autogenous shrinkage in cement mortar and concrete10.1016/j.conbuildmat.2021.123166 ↗
42. Drying shrinkage prediction of paste containing meta-kaolin and ultrafine fly ash for developing ultra-high performance concrete10.1016/j.mtcomm.2016.01.001 ↗
43. Modelling of autogenous shrinkage of hardening cement paste10.1016/j.conbuildmat.2020.120708 ↗
44. Establishment of the durability indices for cement-based composite containing supplementary cementitious materials10.1016/j.matdes.2011.12.030 ↗
45. Mechanical and thermal properties of lightweight geopolymer mortar incorporating crumb rubber10.1016/j.jclepro.2018.06.003 ↗
46. Improving properties of high-volume fly ash cement paste blended with β-hemihydrate from flue gas desulfurization gypsum10.1016/j.conbuildmat.2020.120494 ↗
47. Preparation of eco-friendly lightweight gypsum: use of beta-hemihydrate phosphogypsum and expanded polystyrene particles10.1016/j.conbuildmat.2021.123837 ↗
48. Thermal properties of cement mortar with different mix proportions10.3989/mc.2020.09219 ↗
49. Thermal properties and residual strength after high temperature exposure of cement mortar using ferronickel slag aggregate10.1016/j.conbuildmat.2018.12.068 ↗
50. Thermal properties of cement mortars containing waste glass aggregate and nanosilica10.1016/j.proeng.2017.07.186 ↗
51. Thermal conductivity of cement paste containing waste glass powder, metakaolin and limestone filler as supplementary cementitious material10.1016/j.jclepro.2020.125018 ↗
52. Study on thermal conductivity of cement with thermal conductive materials in geothermal well10.1016/j.geothermics.2019.04.001 ↗
53. Study on mechanical and thermal properties of graphite modified cement concrete10.4028/www.scientific.net/KEM.599.84 ↗
54. Effect of foaming gas and cement type on the thermal conductivity of foamed concrete10.1016/j.conbuildmat.2019.117197 ↗
55. Thermal conductivity of cement paste: influence of macro-porosity10.1016/j.cemconres.2021.106385 ↗
56. Development of ultra-lightweight cement composites with low thermal conductivity and high specific strength for energy efficient buildings10.1016/j.conbuildmat.2015.04.004 ↗
57. Engineering properties of cementless concrete produced from GGBFS and recycled desulfurization slag10.1016/j.conbuildmat.2014.04.017 ↗
58. Improved microstructure of cement-based composites through the addition of rock wool 9articles10.1016/j.matchar.2013.06.020 ↗
59. Hydration properties and microstructure characteristics of alkali–activated steel slag10.1016/j.conbuildmat.2020.118141 ↗
60. Thermal stability of C-S-H phases and applicability of Richardson and Groves’ and Richardson C-(A)-S-H(I) models to synthetic C-S-H10.1016/j.cemconres.2016.12.005 ↗
61. Procedure to use phosphogypsum industrial waste for mineral CO2 sequestration10.1016/j.jhazmat.2011.09.039 ↗
62. Utilization of precipitated CaCO3 from carbon sequestration of industrially emitted CO2 in cementless CaO-activated blast-furnace slag binder system10.1016/j.jclepro.2017.08.097 ↗
63. Microstructural and strength improvements through the use of Na2CO3 in a cementless Ca(OH)2-activated Class F fly ash system10.1016/j.cemconres.2014.10.001 ↗
64. Production of price-competitive bricks using a high volume of stone powder sludge waste and blast furnace slag through cementless CaO activation10.1016/j.conbuildmat.2016.06.088 ↗
65. Differential scanning calorimetry study of hydrated ground granulated blast-furnace slag10.1016/S0008-8846(00)00472-5 ↗
66. Evaluation of pozzolanic activity and physicomechanical characteristics in metakaolin-lime pastes10.1007/s10973-005-7262-y ↗
67. Behaviour of inorganic matter during heating of Bulgarian coals: 1. Lignites10.1016/j.fuproc.2005.01.024 ↗
68. Environmental evaluation, hydration, pore structure, volume deformation and abrasion resistance of low heat Portland (LHP) cement-based materials10.1016/j.jclepro.2018.08.281 ↗
69. Statistical modelling of compressive strength controlled by porosity and pore size distribution for cementitious materials10.1016/j.cemconcomp.2018.10.012 ↗
70. A study on hydration, compressive strength, and porosity of Portland-limestone cement mixes containing SCMs10.1016/j.cemconcomp.2014.03.006 ↗
71. Structural characterization of C–S–H and C–A–S–H samples—Part II: Local environment investigated by spectroscopic analyses10.1016/j.jssc.2009.09.024 ↗