Assessment on the Potential of Volcano Ash as Artificial Lightweight Aggregates using Geopolymerisation Method (original) (raw)

Evaluation of pelletized artificial geopolymer aggregate manufactured from volcano ash

This paper introduced the new pelletized artificial geopolymer aggregate made from volcano ash. This is one of the effort to diminish the high quantity of volcano mud from East Java, Indonesia, that become a major issue since May 29, 2006 when it surfaced from the bowel of the earth and impacted an area of almost 770 hectare to a depth of 20 m, and thirty thousand people have been displaced which cost Indonesia $3.7 billion in damages and damage control. The characterization of volcano ash was first examined. The major constituent was SiO 2 and Al 2 O 3 for this material. The microstructure properties showed the volcano ash has a plate like structure and the shell covered outer surface of this aggregate appear naturally. The geopolymer artificial aggregate was examined with various curing temperature of 500 °C, 600 °C and 800 °C. The results show that the specific gravity of geopolymer artificial aggregate was in the range of 1.7-2.0 g/cm 3. The lowest specific gravity was observed at sintering temperature of 800°C. The water absorption can be modulated by controlling the sintering temperature.

Physical Properties of Volcanic Ash Based Geopolymer Concrete

This paper describes the result of investigating volcanic ash of Mount Kelud as fly ash substitute material to produce geopolymer concrete. The test was held on geopolymer concrete blended with 0%, 25%, 50% and 100% fly ash replacement with volcanic ash. Natrium Hidroxide (NaOH) with concentration of 12 molar and Natrium Silicate (Na2SiO3) were used as alkaline activator. While alkali-activator ratio of 2 was used in this research. The physical properties was tested by porosity and setting time test, while split tensile strength presented to measure brittle caracteristic of geopolymer concrete. The result shown that increasing volcanic ash content in the mixture will increase setting time of geopolymer paste. On the other hand increasing volcanic ash content will reduce split tensile strength and porosity of geopolymer concrete. After all replacing fly ash with volcanic ash was suitable from 25% to 50% due to its optimum physical and mechanical properties.

Study on Radioactivity Components, Water Quality and Microstructure Characteristic of Volcano Ash as Geopolymer Artificial Aggregate

REV. CHIM. (Bucharest) ♦ 64 ♦ No. 6 ♦ 2013

The assessments of radioactivity, water quality testing and microstructure characteristic of volcano ash have been examined. The measurement of the 226Ra, 232Th, 40K, and 238U were carried out using radioactive concentration value. The results showed that 226Ra = 39 Bq/kg, 232Th = 36 Bq/kg, 40K = 337 Bq/kg which are within acceptable limit for construction building. The radium equivalent activity for volcano ash is 116 ± 1 Bq/ kg, means the exposure of γ radiation is safe. Water from volcano ash may affected the aquatic ecosystem and human health which is not safe to be used as effluent due to high zinc, cadmium, lead, cyanide and sulphide and exceed the allowable limits. The mean particle size of the volcano ash was 121 μm. This volcano ash is almost dominated by quartz phase. SEM analysis showed that volcano ash had a plate-like structure similar to kaolin. The FTIR adsorption band showed the OH-, H-O-H, Si-O, Al-OH, and Si-O-Si and Si-O-Al vibrations appeared in this volcano ash. The average total percentage of weight loss after being heated to 1000°C was 15.85%.

Characterization of LUSI Mud Volcano as Geopolymer Raw Material

Advanced Materials Research, 2012

The mud of mud volcano samples were collected from an eruption site named ‘LUSI’ (Lumpur “mud” –Sidoarjo), East Java, Indonesia for characterization. Analysis showed that, the major constituents of mud are SiO2 and Al2O3 which are higher than those in fly ash. The particle of mud has a flake-shaped particle and the overall particle size is dominated by particles between 2.5µm – 25.0µm. The results of XRD shows that mud of mud volcano have a characteristic of structurally disordered compounds, and a set of peaks corresponding to minor crystalline phases such as quartz, feldspars, and kaolinite. FTIR adsorption bands of the raw material of mud have the chemical bonding between bands 1-5.

Geopolymer Concrete Made From Volcanic Ash of Mount Sinabung

International Journal of Integrated Engineering, 2020

Geopolymer concrete is one of the solutions in an environmentally friendly concrete production process. This research aimed to produce geopolymer concrete from Sinabung volcanic ash, which has high content of SiO2, and to discover the mechanical behavior of the resulted geopolymer concrete. The geopolymer concrete made was in cylindrical shape with diameter of 10 cm and height of 20 cm height. The mixture component consisted of NaOH and Na2SiO3 as alkaline activator. The curing process was conducted in the oven at 60 C for four different variation of time, namely, 4 hours, 8 hours, 12 hours and 24 hours. The mechanical properties were measured by testing the compressive strength and absorption value for the sample aged 7-day, whereas the estimated value for 28-day value was calculated from the conversion formula. The tests referred to SNI 1974:2011 testing regulation and ASTM C39 for compressive strength; and ASTM C642 for absorption test. The results showed that for 7-day aged samples, which were cured for 4 hours, 8 hours, 12 hours and 24 hours, obtained the average of compressive strength of 18.54 MPa, 23.85 MPa, 30.65 MPa and 36.75 MPa, respectively. The estimated calculation showed that concrete continued to increase in compressive strength. The 28-day aged samples showed the maximum compressive strength of 58.79 MPa. However, after 28 days, the concrete was projected to start to slow down. The absorption test results of each variation were 2.65% for 4 hours; 1.67% for 8 hours; 1.38% for 12 hours and 0.58% for 24 hours. Based on these results, it can be concluded that the curing time of 24 hours gave the most optimal compressive strength and the smallest value of absorption test. From the compressive strength result, it can be said that the geopolymer concrete made from Sinabung volcanic ash has high quality of concrete.

Utilization of Volcanic Ash of Mount Sinabung as a Substitute for Cement to Flexure Strength of Geopolymer Concrete

2018

Concrete is one of the construction materials that have been commonly used for the construction of buildings, bridges, roads and so forth. The need for concrete will increase in line with the increasing need of basic human facilities and infrastructures. Therefore, the production of cement as a binder of concrete increases as well. In the process of cement production occurs a process of a huge amount of CO2 release into the atmosphere and then damage the environment which among them cause global warming. To overcome these problems, it’s necessary to find another material as a substitute for cement. Geopolymer concrete is an alternative to substitute concrete that uses cement. Geopolymer concrete is made without the use of cement as a concrete binder, and instead, using sinabung ash which is rich in silica and alumina and can react with alkaline liquids to produce a binder. In this research, the flexure strength of concrete is tested to a number of samples in the form of 15x15x60 cm3...

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

This paper looks at the possibility of using low reactive volcanic ash for making geopolymer cement. The research is directed towards (a) alteration of the reactivity of volcanic ash by mechanical activation, and (b) use of mechanically activated volcanic ash for the synthesis of a geopolymer. The effect of mechanical activation was quite visible on particle size distribution and the degree of crystallinity. The disappearance of some anorthite peaks and appearance of quartz peaks in volcanic ashes milled for 120 min demonstrate the change in mineralogy. The appearance of an intense carbonate band with milling time could be related to sorption of atmospheric CO 2 on the grains surface during mechanical activation. The manifestation of mechanical activation of volcanic ash was prominent on (a) the reaction kinetics, (b) microstructural development, and (c) physico-mechanical properties of the geopolymer product. The rate constant and extent of geopolymerization increased with milling time but decreased with curing temperature. This decrease is in non-conformity with other alumina-silicate materials used for geopolymerization such as metakaolin and fly ash. FEG-SEM and EDAX results revealed that the geopolymer gel obtained is mixture of poly(ferro-sialate-siloxo) and poly(ferro-sialate-disiloxo)

Impact of incorporation of volcanic ash on geopolymerization of eco-friendly geopolymer composites: A review

IOP Conference Series: Materials Science and Engineering, 2019

Volcanic ash is a product from an explosive type of volcanic eruptions. Fresh particles of volcanic ash are gritty, abrasive, vexatious and corrosive with huge scale dispersion. Consequently, it is the need of the hour to dispose this waste systematically to have relief from dilemmas like land fillings; climatic changes, pollution of the environment, water, and health hazards although the soil is a mineral intake. This crucially reviewed manuscript includes not merely the comprehension of the incorporation of volcanic ash to develop novel green Geopolymer composites but also to study its impact on the geopolymerization reaction kinetics and reactivity at dissimilar temperatures along with a precise account of its chemistry, mineralogy and the morphology.

Manufacture of geopolymeric mortars from ash coming from the Ubinas volcano, assessment of its mechanical, physical and microstructural properties

Revista Boliviana de Quimica, 2020

In this study, it has been proposed a geopolymerization method that uses a low liquid/solid (L/S) ratio and the piston as a compaction method which has favored the compression strength achieved considering that the synthesis of geopolymers is characterized by the use of an alkaline solution with a high L/S ratio (greater than 0.45). The volcanic ashes from the Ubinas volcano (Peru's most active volcano) that are rich in Al2O3, SiO2 and CaO were alkaline activated with sodium hydroxide (NaOH) and sodium hydroxide with addition of sodium silicate (NaOH+Na2SiO3), both solutions with 12 M concentration, with a low liquid/solid (L/S) ratio of 0.1 and solid:solid