scholarly journals Alkali Activated Mortars with Intumescent Properties

2019 ◽  
Vol 70 (2) ◽  
pp. 431-437 ◽  
Author(s):  
Adrian Ionut Nicoara ◽  
Alina Badanoiu ◽  
Magdalena Balanoiu ◽  
Alexandra Mathias ◽  
Georgeta Voicu
Keyword(s):  
Titanium Alloy ◽  
Glass Powder ◽  
Low Cost ◽  
Alkaline Solutions ◽  
Mechanical Processing ◽  
Inorganic Polymers ◽  
Passive Fire Protection ◽  
Waste Glass Powder ◽  
New Type ◽  
Alkali Activated

The paper presents the properties of a new type of alkali activated borosilicate inorganic polymers (AABSIPs) resulted by the activation of waste glass powder and fly ash with alkaline solutions. The alkali activators used in this study were mixtures of borax decahydrate with NaOH and KOH solutions. For the preparation of AABSIP mortars two types of aggregates were used i.e. sand and a waste resulted during the mechanical processing of titanium alloy ingots. The thermal treatment of these pastes and mortars determines an intumescent process i.e. significant increase of volume; consequently, these materials could be used as low-cost fire stopper blocks for passive fire protection of buildings.

scholarly journals Alkali activated materials based on glass waste and slag for thermal and acoustic insulation

2019 ◽  
Vol 69 (335) ◽  
pp. 194 ◽  
Author(s):  
S. Stoleriu ◽  
I. N. Vlasceanu ◽  
C. Dima ◽  
A. I. Badanoiu ◽  
G. Voicu
Keyword(s):  
Thermal Treatment ◽  
Glass Powder ◽  
Waste Glass ◽  
Partial Substitution ◽  
Alkali Activation ◽  
High Porosity ◽  
Glass Waste ◽  
Activation Temperature ◽  
Waste Glass Powder ◽  
Alkali Activated

Porous alkali activated materials (AAM), can be obtained from waste glass powder and slag mixtures by alkali activation with NaOH solution. To obtain an adequate porous microstructure, the hardened AAM pastes were thermally treated at temperatures ranging between 900°C and 1000°C, for 60 or 30 minutes. Due to the intumescent behaviour specific for this type of materials, an important increase of the volume and porosity occurs during the thermal treatment. The partial substitution of waste glass powder with slag, determines the increase of compressive strength assessed before (up to 37 MPa) and after (around 10 MPa) thermal treatment; the increase of slag dosage also determines the increase of the activation temperature of the intumescent process (above 950°C). The high porosity and the specific microstructure (closed pores with various shapes and sizes) of these materials recommend them to be utilised as thermal and acoustical insulation materials.

scholarly journals Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 147
Author(s):  
Adrian Ionut Nicoara ◽  
Alina Ioana Badanoiu
Keyword(s):  
Low Cost ◽  
Hydrolytic Stability ◽  
Heat Treating ◽  
Processing Parameters ◽  
Waste Glass ◽  
Curing Temperature ◽  
Inorganic Polymers ◽  
X Ray Diffraction ◽  
Waste Glass Powder ◽  
Calcium Silicates

The main objective of this study is the synthesis and characterization of low cost alkali-activated inorganic polymers based on waste glass (G-AAIPs) using a mixture of NaOH and Ca(OH)2 as alkali activators, in order to improve their hydrolytic stability. This paper also presents detailed information about the influence of composition determined by X Ray Diffraction (XRD), microstructure determined by Scanning Electronic Microscopy (SEM) and processing parameters on the main properties of G-AAIP pastes. The main factors analyzed were the glass fineness and the composition of the alkaline activators. The influence on intumescent behavior was also studied by heat treating of specimens at 600 °C and 800 °C. The use of Ca(OH)2 in the composition of the alkaline activator determines the increase of the hydrolytic stability (evaluated by underwater evolution index) of the G-AAIP materials compared to those obtained by NaOH activation. In this case, along with sodium silicate hydrates, calcium silicates hydrates (C-S-H), with good stability in a humid environment, were also formed in the hardened pastes. The highest intumescence and an improvement of hydrolytic stability (evaluated by underwater evolution index and mass loss) was achieved for the waste glass powder activated with a solution containing 70% NaOH and 30% Ca(OH)2. The increase of the waste glass fineness and initial curing temperature of G-AAIPs have a positive effect on the intumescence of resulted materials but have a reduced influence on their mechanical properties and hydrolytic stability.

scholarly journals Effect of Curing Temperature in the Alkali-Activated Brick Waste and Glass Powder mortar and Their Influence of Mechanical resistances

2020 ◽  
Author(s):  
Zine El Abidine Rahmouni ◽  
Nadia Tebbal ◽  
Imen Yamina Omri
Keyword(s):  
Mechanical Properties ◽  
Water Glass ◽  
Glass Powder ◽  
Storage Temperature ◽  
Curing Temperature ◽  
Alkali Activation ◽  
Powder Body ◽  
Waste Glass Powder ◽  
Specific Fracture ◽  
Alkali Activated

In this study, compressive strength values were measured at different curing times(7,14 and 28 days).The alkali-activation of the brick and glass powder body with potassium water glass having a silicate modulus of 3. Compressive strengths, flexural strength and specific fracture energy of the specimens stored at 40° C and 60° C are evaluated at 28-days. The study demonstrates that the storage temperature of specimens and the content of the alkaline solution have a significant influence on all mechanical properties of the studied materials. Keywords: brick waste, glass powder, curing temperature, alkali-activated.

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