scholarly journals The Durability of Mortar Containing Alkali Activated Fly Ash-Based Lightweight Aggregate

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3741
Author(s):  
Puput Risdanareni ◽  
Philip Van den Heede ◽  
Jianyun Wang ◽  
Nele De Belie
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Weight Ratio ◽  
Lightweight Aggregate ◽  
High Water ◽  
High Porosity ◽  
Carbonation Resistance ◽  
Chloride Migration ◽  
The One ◽  
Alkali Activated

Beneficiating fly ash as valuable construction material such as artificial lightweight aggregate (LWA) could be an alternative solution to increase the utilization of the industrial by-product. However, generally, LWA is characterized by high porosity and a related high water absorption, which on the one hand allows production of lightweight mortar, but on the other hand can affect its performance. Thus, in this research, the durability performance of mortar composed with alkali-activated fly ash-based LWA, and commercial expanded clay (EC) LWA was investigated. The fly ash LWA was prepared in a pan granulator, with a 6-molar solution of NaOH mixed with Na2SiO3 in a Na2SiO3/NaOH weight ratio of 1.5 being used as activator (FA 6M LWA). The results revealed that mortar containing FA 6M LWA had equivalent mechanical strength with mortar containing EC LWA. The mortar containing FA 6M LWA had comparable capillary water uptake and chloride migration resistance with the reference and EC LWA mortar. Furthermore, the addition of FA 6M LWA was proven to enhance the carbonation resistance in the resulting mortar, due to the denser interfacial transition zone (ITZ) of mortar with LWA.

scholarly journals Effect of alkali content and slag content on the fresh and hardened properties of air-cured alkali activated mortar containing fly ash

2021 ◽  
Author(s):  
Thushara Raju ◽  
Namitha S ◽  
Muhammed Nabil K ◽  
Mohammed Rafeeque N. V ◽  
Reshma Sundhar ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Construction Material ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Alkali Content ◽  
Hardened Properties ◽  
Alkali Activated ◽  
Slag Content

Alkali Activated Material (AAM) is introduced as a pioneering construction material in the construction diligence to trim down the utilization of Ordinary Portland Cement (OPC) and to curtail the amount of carbon dioxide released during the production of OPC. Modestly refined industrial by products or natural materials rich in alumino silicates are the binding agents used in AAM. Generally, heat curing is needed for the alkali activated mortar to achieve the required hardened properties and this difficulty can be overcome by adding slag to the mix. In this experimental analysis, the alkali activated mortar mixes with different proportions of glassy granulated slag and Class F fly ash were prepared without the usage of superplasticizers, with alkali to binder (a/b) ratios of 0.7, 0.8 and 0.9. The rheological characteristics of mortar were studied using flow table apparatus and hardened properties were studied using compressive strength test and ultrasonic pulse velocity (UPV) test by testing cylindrical specimens of size 25 mm diameter and 50 mm height. The mortar specimens were air-cured, and the compressive strength and UPV test were conducted after 3 and 7 days. The test results showed that due to the presence of higher alkali content and the decrease in slag content, the workability of alkali activated mortar was improved, but the measure of strength decreased. The mix with 100% slag and a/b ratio of 0.8 had the best UPV value, indicating its quality among the various mortar mixes studied. This study portrays the significance of optimising the alkali and slag content in tailor making an alkali activated mortar system with good hardened properties.

Development of Lightweight Construction Material from Alkali Activated Fly Ash

2009 ◽  
Vol 35 (3) ◽  
pp. 127-134 ◽  
Author(s):  
Hossein Rostami ◽  
Robert Brooks ◽  
Fernando Tovia ◽  
Mozhgan Bahadory
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Lightweight Construction ◽  
Alkali Activated

scholarly journals Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

2019 ◽  
Vol 116 ◽  
pp. 146-158 ◽  
Author(s):  
Marija Nedeljković ◽  
Bahman Ghiassi ◽  
Sieger van der Laan ◽  
Zhenming Li ◽  
Guang Ye
Keyword(s):  
Fly Ash ◽  
Pore Solution ◽  
Curing Conditions ◽  
Carbonation Resistance ◽  
Alkali Activated

scholarly journals Lightweight sintered aggregate as construction material in concrete structures

2018 ◽  
Vol 174 ◽  
pp. 02008
Author(s):  
Robert Grygo ◽  
Victor Pranevich
Keyword(s):  
Fly Ash ◽  
Laboratory Test ◽  
High Resistance ◽  
Construction Material ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Solid Material ◽  
High Durability ◽  
Strength Material ◽  
Product Fraction

The paper presents the result of testing a new patented lightweight aggregates. The only solid material used to manufactured these aggregate is fly ash. Lightweight sintered aggregate is durable, lightweight and high-strength material. It is environmentally friendly material. It has chance to by future material in concrete use. The laboratory test shown that the concrete made from the this special lightweight sintered aggregate possesses low porosity, high strength and high durability potential. The bulk density, depending on the product fraction, oscillates between 550- 830 kg/m3. This special lightweight sintered aggregate has also high resistance to crushing, when we compare to another lightweight aggregate.

scholarly journals Waste glass as binder in alkali activated slag–fly ash mortars

2019 ◽  
Vol 52 (5) ◽  
Author(s):  
G. Liu ◽  
M. V. A. Florea ◽  
H. J. H. Brouwers
Keyword(s):  
Fly Ash ◽  
Glass Powder ◽  
Reference Sample ◽  
Drying Shrinkage ◽  
Waste Glass ◽  
Reaction Products ◽  
Alkali Activated Slag ◽  
Carbonation Resistance ◽  
Activated Slag ◽  
Alkali Activated

Abstract This paper illustrates the application of waste glass powder as part of the binder in slag–fly ash systems activated by NaOH and NaOH/Na2CO3 activators. To evaluate the reaction kinetics, reaction products, mechanical properties, and durability performance of glass powder modified alkali activated slag–fly ash systems, calorimetry test, X-ray diffraction, FTIR, strength test, drying shrinkage tests, and carbonation test were conducted. From the isothermal calorimeter results, glass powder shows a higher reactivity compared to fly ash but still lower than slag. The reaction products of glass power modified samples exhibit an enhancement of polymerization degree of Si–O–T, observed in FTIR. As a consequence, higher drying shrinkage exists in glass modified mortars. The mechanical performance of different samples is mostly controlled by the Ca/Si of dry mixtures and activator type. After the slag–fly ash binder system was modified by the waste glass, a significant enhancement of resistance to carbonation was identified, especially for NaOH/Na2CO3 activated mortars, which show an increase of 300% on the carbonation resistance ability compared to the reference sample. The Na/(Si + Al) ratio of dry mixtures exhibits a positive correlation with carbonation resistance.

Properties of concrete made with alkali-activated fly ash lightweight aggregate (AFLA)

2007 ◽  
Vol 29 (2) ◽  
pp. 128-135 ◽  
Author(s):  
Byung-wan Jo ◽  
Seung-kook Park ◽  
Jong-bin Park
Keyword(s):  
Fly Ash ◽  
Lightweight Aggregate ◽  
Alkali Activated
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