Effect of cement additive on physical and mechanical properties of high calcium fly ash geopolymer mortars

2020 ◽  
Author(s):  
Mehmet Kaya ◽  
Fuat Köksal
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Physical And Mechanical Properties ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Cement Additive

Experiment and Micro-Mechanism Study on Mechanical Properties and Durability of High-Calcium Fly Ash Concrete

2011 ◽  
Vol 480-481 ◽  
pp. 59-65
Author(s):  
Shuang Xi Li ◽  
Tuan She Yang ◽  
Zhi Ming Wang ◽  
Quan Hu
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Frost Resistance ◽  
Strength Development ◽  
Hydration Reaction ◽  
Optimal Dosage ◽  
Fly Ash Concrete ◽  
Low Calcium ◽  
High Calcium ◽  
High Calcium Fly Ash

Low-calcium fly ash is paid much attention for its wide use in engineering, the research and application technology of it are very mature, but as to high-calcium fly ash concrete, the researches on stability, mechanical property and durability of it are very less , The existing researches are still inadequate for practice of engineering. As to this problem, using small shek kip hydropower project as example, the volume stability of high-calcium fly ash concretes with different fly ash dosages are tested, then the optimal dosage of the high-calcium fly ash is determined; based on this, the impacts of high-calcium fly ash on the performance of mechanical properties , impermeability and frost resistance of concrete are studied; Finally, macro performance is analyzed from a micro-mechanism point of view through taking the electron micrograph. As the study shows, the optimal dosage of high-calcium fly ash should be taken as 20% -25%; for the concrete with special requirements, the dosage can be relaxed to 30% when the high-calcium fly ash achieves high quality. The compressive strength of high-calcium fly ash concrete is higher than the low-calcium fly ash concrete. Strength development advantage of high-calcium fly ash concrete reflects at the early age, this advantage takes the trend of weakening as the development of age. Concrete mixed with high-calcium fly ash has good performance in impermeability. The high-calcium fly ash has high activity, the high-calcium fly ash and secondary hydration reaction products can be filled into the pore capillary and cracks of the concrete structure, improving the pore structure, thereby increasing the density of cement paste. High-calcium fly ash concrete has good performance in frost resistance. The destructive effects of freeze-thaw cycles on cement structure has connection with the microstructure of cement and impermeability , the improvement of impermeability avoids the water entering into the concrete, reduces the risk of destruction caused by frost heave.The study on micro-mechanism proves well the macro-phenomena above.

scholarly journals Evaluation of the Chemical and Mechanical Properties of Hardening High-Calcium Fly Ash Blended Concrete

Materials ◽  
2015 ◽  
Vol 8 (9) ◽  
pp. 5933-5952 ◽  
Author(s):  
Wei-Jie Fan ◽  
Xiao-Yong Wang ◽  
Ki-Bong Park
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
High Calcium ◽  
High Calcium Fly Ash

scholarly journals Studies on Mechanical properties of High Calcium Fly ash based sustainable Geopolymer concrete

2021 ◽  
Vol 2070 (1) ◽  
pp. 012184
Author(s):  
B Vijaya Prasad ◽  
N Anand ◽  
P D Arumairaj ◽  
M Sanath Kumar ◽  
T Dhilip ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Construction Material ◽  
Sustainable Construction ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
High Calcium ◽  
Major Interest ◽  
High Calcium Fly Ash

Abstract Geopolymer concrete (GPC) is a Sustainable construction material, in which cement is completely replaced by Fly ash as binder. To control emission of CO2 during the production of cement, it is advisable to use alternate sustainable Cementitious material. The development of GPC become a major interest to use for in-situ and precast applications. The present study aims to develop High calcium fly ash based GPC with aid of alkaline liquids such as sodium Hydroxide (NaOH) and Sodium silicate (Na2SiO3). Different molarities i.e 4M, 6M, 8M and 10M are used to develop the GPC under ambient and oven curing process. In the present investigation the Fresh properties of GPC and Mechanical properties such as compressive strength, Tensile strength, Flexural strength and Elastic modulus of GPC are investigated. An increase of alkaline activator in in the mix decreased the workability of GPC. The developed GPC mix of 8M is found to be the optimum for gain in compressive strength. A polynomial relationship is obtained for the mechanical properties of GPC developed under ambient and oven curing. The development cost of GPC can be reduced up to 11.25 to 16.5% as compared with conventional concrete grade of M25.

Mechanical Properties of High-calcium Fly Ash Geopolymer with Nano-SiO2 Particle Sizes

2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Chudapak Detphan ◽  
Satakhun Detphan ◽  
Khattiya Chompoovong ◽  
Tanakorn Phoo-ngernkham ◽  
Sakonwan Hanjitsuwan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Particle Sizes ◽  
Sio2 Particle ◽  
Nano Sio2 ◽  
High Calcium ◽  
High Calcium Fly Ash
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