Effect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases

2021 ◽  
Vol 33 (3) ◽  
pp. 04021001
Author(s):  
Maheshbabu Jallu ◽  
Sireesh Saride ◽  
Arul Arulrajah ◽  
Subrahmanyam Challapalli ◽  
Robert Evans
Keyword(s):  
Fly Ash ◽  
Curing Time

Effect of Curing Time and Sintering to the Properties of Geopolymer Mortars

2017 ◽  
Vol 888 ◽  
pp. 184-187
Author(s):  
Salwa Ismail ◽  
Mohammad Faizal Mohd Razali ◽  
Izwan Johari ◽  
Zainal Arifin Ahmad ◽  
Shah Rizal Kasim
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Distilled Water ◽  
Curing Time ◽  
Pore Former ◽  
X Ray ◽  
Before And After ◽  
Naoh Solution ◽  
Added Water ◽  
Alkaline Activator

In this study, the geopolymer mortars were synthesized with fly ash (FA) and silica powder as aluminosilicate sources and a combination of sodium hydroxide (NaOH) solution, sodium silicate (Na2SiO3) solution and distilled water as alkaline activator. Commercial sago was used as a pore former in the mortars. The percentage of sago used were 10, 20 and 30 wt% of FA. The amount of added water used in each mixture was 5% by weight of FA, NaOH solution and Na2SiO3 solution. The formed geopolymer mortars were cured for 1, 3 and 7 days and sintered at 1000 °C. X-ray fluoresence (XRF) shown that FA contains higher amount of silica (SiO2) and alumina (Al2O3) which is important as aluminosilicate sources. The properties of the geopolymer mortars before and after sintered at 1000 °C have been investigated. The results show that geopolymer mortars with 10% of sago content with curing time of 7 days and sintered at 1000 °C give the highest compressive strength of 13.5 MPa.

The Effect of Curing Time on the Properties of Fly Ash-Based Geopolymer Bricks

2012 ◽  
Vol 626 ◽  
pp. 937-941 ◽  
Author(s):  
W.I. Wan Mastura ◽  
H. Kamarudin ◽  
I. Khairul Nizar ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
H. Mohammed
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Experimental Work ◽  
Base Material ◽  
Curing Time ◽  
Curing Conditions ◽  
Alkaline Activator

This paper reports the results of an experimental work conducted to investigate the effect of curing conditions on the properties of fly ash-based geopolymer bricks prepared by using fly ash as base material and combination of sodium hydroxide and sodium silicate as alkaline activator. The experiments were conducted by varying the curing time in the range of 1-24 hours respectively. The specimens cured for a period of 24 hours have presented the highest compressive strength for all ratio of fly ash to sand. For increasing curing time improve compressive strength and decreasing water absorption.

scholarly journals Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

2018 ◽  
Vol 9 (1) ◽  
pp. 68 ◽  
Author(s):  
Samnang Phoak ◽  
Ya-Sheng Luo ◽  
Sheng-Nan Li ◽  
Qian Yin
Keyword(s):  
Fly Ash ◽  
Construction Materials ◽  
Liquid Limit ◽  
Atterberg Limits ◽  
Shaanxi Province ◽  
Sustainable Construction ◽  
Dry Density ◽  
Curing Time ◽  
Maximum Dry Density ◽  
Swell Potential

In this study, the influence of fly ash (FA) content (0%, 10%, 20%, and 30%) on the alteration in the physical and mechanical parameters of loess is investigated. The influences of curing time (0, 14, and 28 days) and submergence and non-submergence conditions are analyzed as well. Analysis considers the variation in Atterberg limits (liquid limit, plastic limit, and plasticity index), compaction parameters (optimum moisture content (OMC), and maximum dry density (MDD)), unconfined compressive strength (UCS) stress, UCS strain, California bearing ratio (CBR) value, and swell potential. Results show that the application of FA-stabilized loess (FASL) is effective. Specifically, the MDD decreases and the OMC increases, the UCS stress increases and the UCS strain decreases, the CBR value improves and the swell potential declines, but Atterberg limits are insignificantly changed by the increase in the FA ratio compared with those of untreated loess. The UCS stress and CBR value are improved with the increase in curing time, whereas the UCS strain is negligible. FASL under submergence condition plays an important role in improving the effect of FA on the UCS stress and CBR value compared with that under non-submergence condition. The UCS stress and CBR value are more increased and more decreased than the UCS strain in submerged samples. Therefore, the application of FASL in flood areas is important for obtaining sustainable construction materials and ensuring environmental protection.

Experimental Research of Foam Concrete with Different Fly Ash Level

2013 ◽  
Vol 683 ◽  
pp. 400-403 ◽  
Author(s):  
Jian Wei Yue ◽  
Zan Li Sun ◽  
Yong Feng Wang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Chemical Method ◽  
Mechanical Test ◽  
Quantitative Relationship ◽  
Low Density ◽  
Curing Time ◽  
Foam Concrete ◽  
Comparative Tests ◽  
Relationship Of

Based on the analysis of structure formation mechanism of foam concrete prepared with chemical method, investigations by a large number of comparative tests and quantitative analysis, quantitative relationship of compressive strength and fly ash dosage on 3d, 7d and 28d foam concrete specimens are analyzed. This investigation examined effect of fly ash that mixed into admixture concerning strength of low –density foam concrete. Mechanical test were performed to measure effect of fly ash on affecting compressive. Results indicate that fly ash significantly reducing compressive strength and increasing thermal conductivity of low-density foam concrete. Moreover, experimental results show that compressive strength of each group is more and smaller with the increase of the curing time.

Effect of Curing Time on Bond Strength between Reinforcement and Fly-ash Geopolymer Concrete

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Aruz Petcherdchoo ◽  
Tawan Hongubon ◽  
Nattawut Thanasisathit ◽  
Koonnamas Punthutaecha ◽  
Sung-Hwan Jang
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Geopolymer Concrete ◽  
Curing Time

Study on Microstructure of Long-Age Concrete with HCSA Expansive Agent

2017 ◽  
Vol 744 ◽  
pp. 40-44 ◽  
Author(s):  
Fang Fang Hou
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Hydration Product ◽  
Curing Time ◽  
Average Ratio ◽  
Expansive Agent ◽  
Binding Material ◽  
High Volume Fly Ash ◽  
Energy Dispersion Spectrum ◽  
Scanning Electron

The microstructure of high-volume fly ash and long-age concrete with HCSA expansive agent at different curing time is studied by means of scanning electron microscope and energy dispersion spectrum analysis. The result shows that wet curing is benefit to the generation of ettringite which is the hydration product of HCSA expansive agent, and also is benefit to the hydration of cement and fly ash, which can fundamentally improve compactness of concrete. For the concrete which mix 6% amount of HCSA expansive agent a 60% amount of fly ash, when it is not cured, the average ratio of Ca to Si is 1.8, and the value is 0.36 after 28d curing. Since the ration of Ca to Si is lower, the hydration rate of binding material is faster.

Water-Resistant Modification of Desulphurization Gypsum Block

2012 ◽  
Vol 182-183 ◽  
pp. 278-282
Author(s):  
Yan Mu ◽  
Ying Li Fu ◽  
Feng Qing Zhao
Keyword(s):  
Fly Ash ◽  
Mechanical Strength ◽  
High Performance ◽  
Water Resistance ◽  
Curing Temperature ◽  
Curing Time ◽  
Operating Property ◽  
High Mechanical Strength ◽  
Calcined Gypsum ◽  
Hemi Hydrate

A high performance water resistance agent KD-3 prepared from OPC cement, fly ash, slag and additives was used for the modification of hemi-hydrate desulphurization gypsum. Various factors on gypsum block were investigated. The prepared gypsum block possesses excellent water-resistance, good operating property and high mechanical strength. The optimized results was obtained: calcined gypsum 74.9%, KD-3 25%, retarder 0.1%, curing temperature 60°C and curing time 16h.

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