Mechanical activation of volcanic ash for geopolymer synthesis: effect on reaction kinetics, gel characteristics, physical and mechanical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39106-39117 ◽  
Author(s):  
Jean Noël Yankwa Djobo ◽  
Antoine Elimbi ◽  
Hervé Kouamo Tchakouté ◽  
Sanjay Kumar
Keyword(s):  
Mechanical Properties ◽  
Mechanical Activation ◽  
Reaction Kinetics ◽  
Volcanic Ash ◽  
Physical And Mechanical Properties

Mechanical activation is a suitable route to enhance the reactivity of volcanic ash and the final properties of the resulting geopolymers.

Fire-Retardant Plastering Mortars Based on Exfoliated Vermiculite and Volcanic Ash

2021 ◽  
Vol 1043 ◽  
pp. 133-139
Author(s):  
Tolya Khezhev ◽  
Artur Zhurtov ◽  
Alim Kazharov ◽  
Tamerlan Zrumov ◽  
Asharbek Samgurov
Keyword(s):  
Mechanical Properties ◽  
Volcanic Ash ◽  
Cement Mortar ◽  
Low Cost ◽  
Fire Retardant ◽  
Physical And Mechanical Properties ◽  
Strength Characteristics ◽  
Multifunctional Additive ◽  
Solution Density ◽  
Noticeable Increase

The research results on the development of fire-retardant composite cement mortar mixtures on exfoliated vermiculite and volcanic ash with the use of a multifunctional additive are presented D-5. Compositions of fire-retardant composite mortars, which make it possible to significantly improve the physical and mechanical properties of mortar mixtures and mortars, are proposed. Introduction of a multifunctional supplement D-5 in mortar mixtures makes it possible to improve the composite mortar mixtures properties and improve the solution characteristics. Replacement of finely dispersed fraction of exfoliated vermiculite d<0,63 mm volcanic ash by volume in mortar mixtures does not cause a noticeable increase in the solution density, while their strength characteristics increase. The developed composite mortar mixtures meet the requirements of GOST 28013–98 and have a low-cost price due to volcanic ash use.

scholarly journals Research of properties of cement-soil piles of foundations of buildings and structures

2020 ◽  
Vol 24 (5) ◽  
pp. 104-108
Author(s):  
N.G. Seregin ◽  
◽  
V.I. Zaprudnov ◽  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Activation ◽  
Russian Federation ◽  
Western Siberia ◽  
Physical And Mechanical Properties ◽  
Soil Types ◽  
Ground Mixture ◽  
Mixing Method ◽  
The Russian Federation ◽  
Cement Soil

The review of soil types prevailing in Western Siberia of the Russian Federation is presented. The compositions and physical and mechanical properties of soils are analyzed. Special attention is paid to loess subsidence soils. The problem of obtaining a homogeneous cement-ground mixture is formulated and set. The technological scheme of production of cement-ground piles of foundations of buildings and structures by drilling-mixing method with mechanical activation is considered. Considers methods of strengthening the loess subsidence of soils. Methods for studying the properties of cement-based piles of foundations of buildings and structures are formulated. A multi-factor experiment was conducted to evaluate the parameters that affect the properties of cement-based piles. Based on the research results, conclusions and recommendations are formulated.

scholarly journals Physical and Mechanical Properties of a Porous Material Obtained by Low Replacement of Volcanic Ash by Aluminum Beverage Cans

2021 ◽  
pp. 1-11
Author(s):  
Bernard Missota Priso Dickson ◽  
Claudine Mawe Noussi ◽  
Louise Ndongo Ebongue ◽  
Joseph Dika Manga
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Porous Material ◽  
Water Absorption ◽  
Bulk Density ◽  
Volcanic Ash ◽  
Physical And Mechanical Properties ◽  
Apparent Porosity ◽  
Partial Replacement ◽  
Inorganic Polymers

This study focuses on the evaluation of the physical and mechanical properties of a porous material based on a mixture of powder (Volcanic ash /Aluminum Beverage Cans) and a solution of phosphoric acid. Volcanic ash (VA) use was collected in one of the quarries of Mandjo (Cameroon coastal region), crushed, then characterized by XRF, DRX, FTIR and named MaJ. The various polymers obtained are called MaJ0, MaJ2.5, MaJ5, MaJ7.5 and MaJ10 according to the mass content of the additions of the powder from the aluminum beverage cans (ABCs). The physical and mechanical properties of the synthetic products were evaluated by determining the apparent porosity, bulk density, water absorption and compressive strength. The results of this study show that the partial replacement of the powder of VA by that of ABC leads to a reduction in the compressive strength (5.9 - 0.8 MPa) and bulk density (2.56 – 1.32 g/cm3) of the polymers obtained. On the other hand, apparent porosity, water absorption and pore formation within the polymers increases with addition of the powder from the beverage cans. All of these results allow us to agree that the ABCs powder can be used as a blowing agent during the synthesis of phosphate inorganic polymers.

Structural Conformation of Polytetrafluoroethylene Composite Matrix

2016 ◽  
Vol 10 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Oleg Budnik ◽  
◽  
Anatoliy Budnik ◽  
Valentin Sviderskiy ◽  
Kristina Berladir ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Activation ◽  
Supramolecular Structure ◽  
Physical And Mechanical Properties ◽  
Composite Matrix ◽  
Service Properties ◽  
Operating Modes ◽  
Structural Conformation ◽  
First Time

Enhancement of physical and mechanical properties and structuring activity of polytetrafluoroethylene as matrix of composites by means of mechanical activation is shown. Operating modes of mechanical activation equipment are defined, in which the service properties of PTFE are maximized. The effect of mechanical activation technology on restructuring and change of morphology and supramolecular structure of PTFE is detected for the first time.

Fiber-Hypsum-Cement-Vermiculite-Concrete Composites Using Volcanic Ash

2021 ◽  
Vol 1043 ◽  
pp. 67-71
Author(s):  
Tolya Khezhev ◽  
Fatima Shogenova ◽  
Madina Bugova ◽  
Nikolay Kalambet ◽  
Inal Tanashev
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Portland Cement ◽  
Volcanic Ash ◽  
Physical And Mechanical Properties ◽  
Regression Equations ◽  
Basalt Fibers ◽  
Expanded Vermiculite

Fiber-gypsum-cement-vermiculite-concrete composites with use of gypsum, Portland cement, volcanic ash, expanded vermiculite and basalt fibers are considered. The results of studies of the compositions and physical and mechanical properties of fiber-gypsum-cement-vermiculite-concrete composites, the dependence of the composite characteristics on the reinforcement with basalt fibers are presented. Graphical interpretations of regression equations for compressive and flexural strength of composites are presented.

scholarly journals Influence of the Activating Solution and Aggregates in the Physical and Mechanical Properties of Volcanic Ash Based Geopolymer Mortars

2021 ◽  
Vol 1054 (1) ◽  
pp. 012003
Author(s):  
Nataly Calderón ◽  
María Vargas ◽  
Jonathan Almirón ◽  
Asunción Bautista ◽  
Francisco Velasco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Volcanic Ash ◽  
Physical And Mechanical Properties ◽  
Activating Solution
Sign in / Sign up

Export Citation Format

Share Document