Microwave curing cement-fly ash blended paste

2021 ◽  
Vol 282 ◽  
pp. 122685
Author(s):  
Yuli Wang ◽  
Shuqiong Luo ◽  
Lei Yang ◽  
Yahong Ding
Keyword(s):  
Fly Ash ◽  
Microwave Curing ◽  
Curing Cement

Determination of optimal microwave curing cycle for fly ash mortars

2008 ◽  
Vol 35 (4) ◽  
pp. 349-357 ◽  
Author(s):  
İlker Bekir Topçu ◽  
Mehmet Uğur Toprak ◽  
Devrim Akdağ
Keyword(s):  
Fly Ash ◽  
Processing Parameters ◽  
Microwave Energy ◽  
Strength Prediction ◽  
Strength Development ◽  
Microwave Curing ◽  
Optimal Processing ◽  
Cement Mortars ◽  
Curing Cycle

Microwave energy can accelerate the hydration of cement, which results in the rapid strength development of concrete. In this paper, prediction of later age compressive strength of fly ash cement mortars, based on the accelerated strength of mortars cured with microwave energy, was investigated. To accelerate curing properly, optimal processing parameters of microwave curing (MC) on Portland cement mortars (CM) and fly ash cement mortars (FA) were first determined and then were applied to mortars. The possible early ages for the strength prediction were found to be at 6 and 8 h for CM and FA, respectively. The error percentages for prediction of CM were ±2.22% and 2.91% for 7 and 28 d, respectively. Error percentages for FA, on the other hand, were ±4.36% and 5.20% for 7 and 28 d, respectively.

Study of Steam and Microwave Curing of Concretes Containing Slag, Fly Ash, or Silica Fume

2014 ◽  
Vol 43 (2) ◽  
pp. 20140107 ◽  
Author(s):  
Ming-Ju Lee ◽  
Ming-Gin Lee ◽  
Yung-Chih Wang ◽  
Yishuo Huang ◽  
Wei-Chien Wang
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Microwave Curing

Effect of Microwave Curing to the Compressive Strength of Fly Ash Based Geopolymer Mortar

2016 ◽  
Vol 841 ◽  
pp. 193-199 ◽  
Author(s):  
Mohd Mustafa Al Bakri Abdullah ◽  
Muhammad Faheem Mohd Tahir ◽  
Kamarudin Hussin ◽  
Mohammed Binhussain ◽  
Januarti Jaya Ekaputri
Keyword(s):  
Global Warming ◽  
Fly Ash ◽  
Precast Concrete ◽  
Construction Materials ◽  
Cost Savings ◽  
Curing Temperature ◽  
Conventional Heating ◽  
Strength Development ◽  
Microwave Curing ◽  
Heat Curing

With the advancement of technology and the economic crisis in Malaysia, has been promoting the development of infrastructure in the use of new structural materials but overall is unsatisfactory in terms of cost savings. One of the alternatives that can be used is to use fly ash as a cement replacement in manufacturing mortar. Replacement of cement with geopolymerization mortar can reduce manufacturing costs and could reduce global warming arising from the production of cement for the production of Portland cement for the release of CO2 into the atmosphere, where CO2 gas gives the largest contribution to global warming . The study will be focused on the effect of microwave curing with various durations and temperature to the mechanical and physical properties of fly ash based geopolymer mortar. For the conventional heating technique, heat is distributed in the specimen from the exterior to the interior leading to the non-uniform and long heating period to attain the required temperature. Application of microwave to the fresh concrete results in removal of water, collapse of capillary pore and densification of sample. Heat curing has been applied to construction materials especially for the precast concrete to improve the strength development process. This concrete attains sufficient strength in short curing time, so the molds can be reused, and the final products can be rapidly delivered to the site. The effect of curing temperature together with their aging days of the cured product will also be investigated. Mechanical properties of the product will be tested using compressive test, and density of the samples.

Microwave curing process and mechanical properties study of epoxy mortars for repairing concrete pavement rapidly

2016 ◽  
Vol 36 (6) ◽  
pp. 443-451 ◽  
Author(s):  
Xu Zhang ◽  
Xiaoqun Wang ◽  
Xuehong Xu ◽  
Yueqing Zhao
Keyword(s):  
Fly Ash ◽  
Electric Field ◽  
Electromagnetic Fields ◽  
Electric Field Distribution ◽  
Microwave Energy ◽  
Concrete Pavement ◽  
Optimum Process ◽  
Curing Process ◽  
Microwave Curing ◽  
Mechanical Strengths

Polymer mortars are used frequently to repair pavement owing to their excellent properties (mix flexural strength ≥5.75 MPa, compressive strength ≥25 MPa). To repair concrete pavement with polymer mortars rapidly, uniform microwave energy can be used to reduce hardening time of polymer mortars. In this study, the distribution of electromagnetic fields in an industrial microwave facility was optimized, and an area AG with uniform and intensive electric field was obtained. Then microwave curing process of epoxy mortars containing fly ash in the area AG was optimized, and mechanical strengths of the epoxy mortars cured in the optimum process were tested. The results show that, although the distribution of electromagnetic fields in the microwave facility is non-uniform overall, there still are some brush-fire areas, where electric field distribution is relatively uniform. Epoxy mortars added with 10 wt% fly ash can be cured rapidly (approximately 20 min) in the area AG and exhibit outstanding mechanical strengths, which can be used to repair concrete pavement rapidly.

scholarly journals Alkali-Activated Fly Ash Manufactured with Multi-stage Microwave Curing

◽  
2016 ◽  
Author(s):  
Shi Shi ◽  
◽  
Hui Li ◽  
Matthias Fabian ◽  
Tong Sun ◽  
...  
Keyword(s):  
Fly Ash ◽  
Microwave Curing ◽  
Multi Stage ◽  
Alkali Activated

Response of alkali activated fly ash mortars to microwave curing

2010 ◽  
Vol 40 (12) ◽  
pp. 1688-1696 ◽  
Author(s):  
Jeevaka Somaratna ◽  
Deepak Ravikumar ◽  
Narayanan Neithalath
Keyword(s):  
Fly Ash ◽  
Microwave Curing ◽  
Alkali Activated

Development of a high strength fly ash-based geopolymer in short time by using microwave curing

2018 ◽  
Vol 44 (7) ◽  
pp. 8216-8222 ◽  
Author(s):  
Ahmed Graytee ◽  
Jay G. Sanjayan ◽  
Ali Nazari
Keyword(s):  
Fly Ash ◽  
High Strength ◽  
Microwave Curing ◽  
Short Time

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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