scholarly journals Mechanical and Fracture Properties of Fly Ash Geopolymer Concrete Addictive with Calcium Aluminate Cement

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2982 ◽  
Author(s):  
Yamin Wang ◽  
Shaowei Hu ◽  
Zhen He
Keyword(s):  
Fracture Toughness ◽  
Fly Ash ◽  
Fracture Energy ◽  
Calcium Aluminate ◽  
Peak Load ◽  
Calcium Aluminate Cement ◽  
Geopolymer Concrete ◽  
Fracture Properties ◽  
Mechanical And Fracture Properties ◽  
Aluminate Cement

In this paper, the mechanical and fracture properties of fly ash geopolymer concrete (FAGC) mixed with calcium aluminate cement (CAC) were explored. Fly ash was partially replaced by CAC with 2.5%, 5% and 7.5%. The results exhibit that the mechanical and fracture behaviors of FAGC are significantly influenced by CAC content. Based on the formation of more aluminum-rich gels, C-(A)-S-H and C-S-H gels, with the increase of CAC content, the compressive strength, splitting tensile strength and elastic modulus improved. Meanwhile, the peak load and effective fracture toughness show a monotone increasing trend. In addition, because C-S-H gels absorbed more energy, the fracture energy of FAGC increases. The maximal peak load, double-K fracture toughness and fracture energy reached up to1.79 kN, 4.27 MPam0.5, 10.1 MPam0.5 and 85.8 N/m with CAC content of 7.5%, respectively.

scholarly journals Effect of Tartaric Acid on Hydration of a Sodium-Metasilicate-Activated Blend of Calcium Aluminate Cement and Fly Ash F

Materials ◽  
2016 ◽  
Vol 9 (6) ◽  
pp. 422 ◽  
Author(s):  
Tatiana Pyatina ◽  
Toshifumi Sugama ◽  
Juhyuk Moon ◽  
Simon James
Keyword(s):  
Fly Ash ◽  
Tartaric Acid ◽  
Calcium Aluminate ◽  
Sodium Metasilicate ◽  
Calcium Aluminate Cement ◽  
Aluminate Cement

Reactions of fly ash with calcium aluminate cement and calcium sulphate

Fuel ◽  
2009 ◽  
Vol 88 (9) ◽  
pp. 1533-1538 ◽  
Author(s):  
Lucía Fernández-Carrasco ◽  
E. Vázquez
Keyword(s):  
Fly Ash ◽  
Calcium Aluminate ◽  
Calcium Sulphate ◽  
Calcium Aluminate Cement ◽  
Aluminate Cement

Composite Geopolymeric Binders of Fly Ash, Effect of the Particle Size and Addition of Calcium Aluminate Cement

2013 ◽  
Vol 1612 ◽  
Author(s):  
L.L Cardona-Hernández ◽  
J.I. Escalante-García
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Curing Temperature ◽  
Chemical Characteristics ◽  
Factorial Experimental Design ◽  
Response Variable ◽  
Aluminate Cement ◽  
Alkali Activated

ABSTRACTAn investigation on composite geopolymeric binders, based on alkali activated fly ash (PFA) substituted with low-alumina calcium aluminate cement (CAC), was carried out using a Factorial experimental design in which the factors and levels were: %Na2O, 8-12%; modulus of the solution Ms=SiO2/Na2O =0 - 2, 10-30 wt% of CAC and fineness of PFA (D90) from 161.8 to 6.46 microns. The contribution of each factor was estimated with the 28-day compressive strength as the response variable. The curing temperature was 24h@60°C, and then at 20°C until mechanical testing. The specimens were also characterized by XRD and SEM. The results showed that the grinding modified the morphology of the PFA without changing the crystallographic or chemical characteristics as detected by XRD; and improved the mechanical properties of the geopolymers. The strength increased notably with the Ms up to 1, and reduced for Ms >1; the strength increased with the %Na2O and %CAC. Electron microscopy showed a higher densification at smaller PFA particle size, and the CAC addition promoted the formation of zeolite and Na2O-Al2O3-SiO2-H2O products.

scholarly journals Effect of PVA fiber on mechanical properties of fly ash-based geopolymer concrete

2021 ◽  
Vol 60 (1) ◽  
pp. 418-437
Author(s):  
Peng Zhang ◽  
Xu Han ◽  
Yuanxun Zheng ◽  
Jinyi Wan ◽  
David Hui
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Fly Ash ◽  
Volume Fraction ◽  
Peak Load ◽  
Fiber Content ◽  
Bending Test ◽  
Geopolymer Concrete ◽  
Fracture Properties ◽  
Pva Fiber

Abstract The effects of polyvinyl alcohol (PVA) fiber content on mechanical and fracture properties of geopolymer concrete (GPC) were investigated in the present study. Mechanical properties include cubic compressive, prism compressive, tensile and flexural strengths, and elastic modulus. The evaluation indices in fracture properties were measured by using the three-point bending test. Geopolymer was prepared by fly ash, metakaolin, and alkali activator, which was obtained by mixing sodium hydroxide and sodium silicate solutions. The volume fractions of PVA fiber (length 12 mm and diameter 40 μm) were 0, 0.2, 0.4, 0.6, 0.8, and 1.0%. The results indicate that the effects of the PVA fiber on the cubic and prism compressive strengths and elastic modulus are similar. A tendency of first increasing and then decreasing with the increase in the PVA fiber content was observed in these properties. They all reached a maximum at 0.2% PVA fiber content. There was also a similar tendency of first increase and then decrease for tensile and flexural strengths, peak load, critical effective crack lengths, fracture toughness, and fracture energy of GPC, which were significantly improved by the PVA fiber. They reached a maximum at 0.8% PVA fiber content, except the tensile strength whose maximum was at 1.0% PVA fiber volume fraction. Considering the parameters analyzed, it seems that the 0.8% PVA fiber content provides optimal reinforcement of the mechanical properties of GPC.

Effects of the addition of inertized MSW fly ash on calcium aluminate cement mortars

2017 ◽  
Vol 157 ◽  
pp. 1106-1116 ◽  
Author(s):  
O. López-Zaldívar ◽  
R.V. Lozano-Díez ◽  
A. Verdú-Vázquez ◽  
N. Llauradó-Pérez
Keyword(s):  
Fly Ash ◽  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Cement Mortars ◽  
Aluminate Cement
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