scholarly journals Wpływ bio-popiołów na wybrane właściwości zapraw cementowych

2017 ◽  
Vol 26 (2) ◽  
pp. 234-240
Author(s):  
Jakub Jura ◽  
Małgorzata Ulewicz
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Water Absorption ◽  
Fluidized Bed ◽  
Frost Resistance ◽  
Cement Mortars ◽  
Mechanical And Physical Properties ◽  
Resistance Tests

Paper presents the possibility of using fly ash from the combustion of two types biomass in fluidized bed boiler to modifications cement mortars composition. The influence of the use of ashes on their mechanical and physical properties (compressive strength, frost resistance, water absorption) of cement mortars. In research part of standarized sand was replaced by fly ash from the combustion of wood with coconut husks and wood with sunflower in the amount of 10, 20 and 30% by weight of cement. The addition of ash, depending on the composition, increase the compressive strength about 17%, decrease a reduction compressive strength after frost resistance tests to 0,5% and slightly increases weight loss and absorbency.

scholarly journals Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1394 ◽  
Author(s):  
Agus Maryoto ◽  
Buntara Sthenly Gan ◽  
Nor Intang Setyo Hermanto ◽  
Rachmad Setijadi
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Water Absorption ◽  
Chloride Ion ◽  
Calcium Stearate ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Tests ◽  
Mechanical And Physical Properties ◽  
Lower Chloride

This work aims to study the effect of Ca(C18H35O2)2 (calcium stearate) on the properties of concrete by using Portland composite cement (PCC) and fly ash as binders. The calcium stearate content used in the concrete here consists of 0, 1, 5, and 10 kg per m3 of concrete volume, or alternatively, 0 to 2.85% by the weight of cement. We have performed several tests for each of the contents, namely, compressive strength, water absorption, chloride ion infiltration, and accelerated corrosion tests. According to the testing, we have found that with the addition of calcium stearate at 1 kg/m3 in self-compacting concrete (SCC) with 10% fly ash, the mechanical and physical properties of SCC can be improved significantly when compared to the SCC without fly ash and calcium stearate, resulting in a stable compressive strength, lower water absorption, lower chloride ion infiltration, and lower degree of corrosion attack.

scholarly journals Biofuel Combustion Fly Ash Influence on the Properties of Concrete

2016 ◽  
Vol 7 (5) ◽  
pp. 546-550
Author(s):  
Aurelijus Daugėla ◽  
Džigita Nagrockienė ◽  
Laurynas Zarauskas
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Water Absorption ◽  
Frost Resistance ◽  
Ash Content ◽  
Mineral Admixtures ◽  
Binding Agent ◽  
Materials Used ◽  
Plasticizing Admixture

Cement as the binding agent in the production of concrete can be replaced with active mineral admixtures. Biofuel combustion fly ash is one of such admixtures. Materials used for the study: Portland cement CEM I 42.5 R, sand of 0/4 fraction, gravel of 4/16 fraction, biofuel fly ash, superplasticizer, water. Six compositions of concrete were designed by replacing 0%, 5%, 10%, 15% 20%, and 25% of cement with biofuel fly ash. The article analyses the effect of biofuel fly ash content on the properties of concrete. The tests revealed that the increase of biofuel fly ash content up to 20% increases concrete density and compressive strength after 7 and 28 days of curing and decreases water absorption, with corrected water content by using plasticizing admixture. It was found that concrete where 20% of cement is replaced by biofuel ash has higher frost resistance.

Effect of Firing Temperature on Mechanical and Physical Properties of Porcelain Balls as Grinding Media

2017 ◽  
Vol 888 ◽  
pp. 37-41
Author(s):  
Hasrul Yahya ◽  
Mohd Roslee Othman ◽  
Zainal Arifin Ahmad
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Firing Temperature ◽  
Chemical Resistance ◽  
Firing Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grinding Media ◽  
Mechanical And Physical Properties

Porcelain balls as grinding media are produced by firing process of clay, quartz and feldspar mixtures. This application need high technological properties such as high compressive strength and hardness, wear resistance, low water absorption and excellent chemical resistance. These properties are associated with higher firing temperatures. The porcelain balls were prepared by mixing 30 wt.% clay, 40 wt.% feldspar and 30 wt.% quartz. The samples were sintered at 1200°C, 1230°C, 1250°C, 1270°C and 1300°C for 2 hours with heating rate of 3°C/min. Both green powder and fired samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM).The properties of the fired samples were evaluated by compressive strength, hardness, shrinkage, water absorption, bulk density, and porosity measurement. Increasing of compressive strength, hardness and density are associated with increasing of firing temperatures. Porcelain balls PB1 and PB2 can be produced as grinding media with optimum mechanical and physical properties at firing temperature 1270°C and 1250°C, respectively.

scholarly journals Cement-fly ash mortars durability, with fly ash from fluidized bed boilers and conventional combustion, exposed to aggressive environment influence

2018 ◽  
Vol 174 ◽  
pp. 02006 ◽  
Author(s):  
Elżbieta Janowska-Renkas ◽  
Jolanta Kowalska ◽  
Grzegorz Janus ◽  
Agnieszka Kaliciak
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Mass Loss ◽  
Fluidized Bed ◽  
Total Porosity ◽  
Environment Impact ◽  
Fly Ashes ◽  
Aggressive Environment ◽  
Cement Mortars ◽  
The Impact

The study shows results of research on the aggressive environment impact (1, 3 and 5% HCl solution) on durability of cement mortars with fraction from 30 to 45% by mass of fly ashes from the fluidized bed combustion (FBC fly ash) and conventional fly ashes used separately and in the form of a mixture. The impact of aggressive environments on durability of cement and ash mortars was tested for aperiod of 365 days, by testing the compressive strength, linear changes, mass loss and porosity. It was demonstrated that mortars with the content of FBC fly ashes, after 365 days of tests showed the higher resistance to aggressive environment impact. It is confirmed by e.g. their higher compressive strength, and thus the reduced total porosity. Reduction of total porosity content (<50 nm) was accompanied by the increased compressive strength, which in the aqueous environment was in favour of cement mortars, and in the aggressive environment in favour of cement and ash mortars. It was demonstrated that the content of pores < 200 nm was lower for mortars with FBC fly ashes and mixtures of ashes regardless of environment the mortars were stored in. A beneficial impact of FBC fly ashes was found on physical properties of mortars, i.e. reduction of the shrinkage, lower mass loss and reduced destruction of mortars in the acid corrosion environment. That effect was especially beneficial for the mortar with higher (45% by mass) content of FBC fly ashes, regardless of aggressive character of the environment.

Effect of Solid to Liquid Ratio on the Mechanical and Physical Properties of Fly Ash Geopolymer without Sodium Silicate

2014 ◽  
Vol 625 ◽  
pp. 46-49 ◽  
Author(s):  
Rosniza Hanim Abdul Rahim ◽  
Khairun Azizi Azizli ◽  
Zakaria Man ◽  
Tia Rahmiati ◽  
Lukman Ismail
Keyword(s):  
Mechanical Property ◽  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Silicate Solution ◽  
Strength Development ◽  
Alkali Activation ◽  
Liquid Ratio ◽  
Mechanical And Physical Properties ◽  
Solid Liquid

Geopolymer is produced from the alkali activation of materials rich in Si and Al with addition of silicate solution in order to improve the mechanical property. Limited research has been done with the absence of silicate solution in the geopolymerization process by varying solid/liquid ratio and on how it works for that condition on mechanical and physical properties. This paper presents an investigation on the mechanical and physical properties of fly ash based geopolymer by varying solid to liquid ratio using sodium hydroxide as the only activator. In addition, the strength development also been investigated. The samples were prepared using 50mm x 50mm x 50mm mould and cured at an elevated temperature (60oC). It can be observed that the optimum compressive strength and density were obtained at solid/ liquid ratio of 4. In addition, the compressive strength of fly ash based geopolymer for all the solid to liquid ratio increased until 14 days and started to decrease later.

scholarly journals Mechanical and physical properties of teak leaves waste/polyurethane composites for particleboard application

2020 ◽  
Vol 29 ◽  
pp. 2633366X2096250
Author(s):  
Masturi ◽  
WN Jannah ◽  
RM Maulana ◽  
T Darsono ◽  
Sunarno ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Raw Material ◽  
Industrial Scale ◽  
Test Results ◽  
Polyurethane Composite ◽  
Mechanical And Physical Properties ◽  
Value Of Water ◽  
Polyurethane Composites

A teak leaf waste/polyurethane composite has been made for particleboard application. Some fraction variations are performed on the use of polyurethane as a matrix with a range of 0.04–0.20 (w/w). Mechanical and physical properties have been tested on the composites produced. The test results showed that the highest compressive strength of the sample reaches 38.5 MPa for polyurethane fraction of 0.14 (w/w). The composite has a density of 1261 kg m−3 which is in accordance with the result of density on teak. The physical properties have been also investigated and it was found that the lowest value of water absorption is 1.38%. This result indicated that the composites produced are potentially to replace wood raw material in eco-friendly industrial scale.

scholarly journals Physical and Mechanical Properties of High-Strength Concrete Modified with Supplementary Cementitious Materials after Exposure to Elevated Temperature up to 1000 °C

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 532 ◽  
Author(s):  
Jianwei Zhou ◽  
Dong Lu ◽  
Yuxuan Yang ◽  
Yue Gong ◽  
Xudong Ma ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Water Absorption ◽  
High Strength Concrete ◽  
Elevated Temperatures ◽  
High Strength ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Strength Concrete

This paper presents the experimental findings of a study on the influence of combining usage of supplementary cementitious materials (SCMs) on the performance of high-strength concrete (HSC) subjected to elevated temperatures. In this study, four types of HSC formulations were prepared: HSC made from cement and fly ash (FA), HSC made from cement and ultra-fine fly ash (UFFA), HSC made from cement and UFFA-metakaolin (MK), and HSC made from cement and FA-UFFA-MK. Mechanical and physical properties of HSC subjected to high temperatures (400, 600, 800, and 1000 °C) were studied. Furthermore, the relation between residual compressive strength and physical properties (loss mass, water absorption, and porosity) of HSC was developed. Results showed that the combined usage of SCMs had limited influence on the early-age strength of HSC, while the 28-d strength had been significantly affected. At 1000 °C, the residual compressive strength retained 18.7 MPa and 23.9 MPa for concretes containing 30% UFFA-5% MK and 10% FA-20% UFFA-5% MK, respectively. The specimen containing FA-UFFA-MK showed the best physical properties when the temperature raised above 600 °C. Combined usage of SCMs (10% FA-20% UFFA-5% MK) showed the lowest mass loss (9.2%), water absorption (10.9%) and porosity (28.6%) at 1000 °C. There was a strongly correlated relation between residual strength and physical properties of HSC exposed to elevated temperatures.

Effects of Calcium Carbide Sludge on Properties of Steam Curing Brick Prepared by Extracted Aluminum Fly Ash

2012 ◽  
Vol 174-177 ◽  
pp. 1516-1519
Author(s):  
Li Guang Xiao ◽  
Rui Bo Li ◽  
Shi Ting Zhang ◽  
Hong Liang Hu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Frost Resistance ◽  
Coal Fly Ash ◽  
Calcium Carbide ◽  
Chemical Plants ◽  
Steam Curing ◽  
Ash Residue

Because the fly ash will produce large amounts of the secondary waste emission after the extraction of aluminum, the utilization of the fly ash residue after the extraction of aluminum has great significance. The autoclaved fly ash bricks studied in this paper use CFB ash residue after extraction of aluminum as the main material, and calcium carbide clay which consists mainly of calcium hydroxide is the waste residua of the production of acetylene gas in the chemical plants. This paper analyzes the chemical composition, the mineral composition and the microstructure of the fly ash residue after extraction of aluminum. In the paper, we also study the law and impacts of compressive strength, flexural strength, frost resistance and water absorption, which are made by calcium carbide clay for the autoclaved fly ash bricks. Experimental results illustrate that calcium carbide clay can significantly improve the compressive strength, the flexural strength and the frost resistance of the coal fly ash autoclaved bricks, and significantly reduce its water absorption.

Preparation and Mineral Phases of Fired Brick Utilizing Iron Tailings

2013 ◽  
Vol 753-755 ◽  
pp. 750-753
Author(s):  
Li Rong Yang ◽  
Hai Bin Chen ◽  
Chun Mei Wang ◽  
Li Zhang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Heating Rate ◽  
Mineral Phases ◽  
Fired Bricks ◽  
Calcined Temperature ◽  
Main Material

Using iron tailings from northern Tangshan region of China as the main material, fly ash and clay as the accessories, fired bricks were prepared. The influences of iron tailings content, heating rate, firing temperature and holding time on water absorption and compressive strength of bricks were investigated. the phases of fired bricks was characterized by XRD. The most suitable conditions is as follows: the range of the iron tailings content is 80%~ 95%, no more than 8°C/min has little effect on the properties of fired bricks, the range of feasible calcined temperature could be adjusted in 1020 ~ 1050°C for 1.5~2h, which make the physical properties and durability of fired bricks accorded with Chinese Fired Common Bricks Standard (GB/T5101-2003). The main mineral phases mainly constituted the mechanical strength of fired product are hematite, quartz, anorthite and augite.

Compressive Strength of Binary and Ternary Blended Cement Mortars Containing Fly Ash and Silica Fume under Autoclaved Curing

2011 ◽  
Vol 343-344 ◽  
pp. 316-321 ◽  
Author(s):  
Watcharapong Wongkeo ◽  
Pailyn Thongsanitgarn ◽  
Arnon Chaipanich
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Environmental Pollution ◽  
Silica Fume ◽  
Cement Mortar ◽  
Blended Cement ◽  
Cement Industry ◽  
Blended Cements ◽  
Cement Mortars

Cement industry is a one of the major sources of environmental pollution therefore the reduction of cement demand should be improved. Fly ash and silica fume is a by-product of industries and it should be reused to reduce the waste pollution. Thus, this study investigated the use of fly ash and silica fume as a cement replacement in binary and ternary blended cements on compressive strength and physical properties of mortar. Autoclaved curing at 130 °C and 20 psi of pressure for 9 h was used in this study. The results show that the compressive strength of binary blended cement mortar with FA tends to decrease with increased FA replacement and shows compressive strength lower than PC control. However, compressive strength of binary blended cement mortar with SF was improved and shows compressive strength higher than that of PC control. The compressive strength of ternary blended cement mortar was higher than binary blended cement at the same level replacement and it increases with increased SF replacement. Moreover, ternary blended cement mortar containing 10%SF by weight contribute in giving compressive strength higher than PC control. The incorporation of FA with SF can enhance workability of blended cement mortar containing only SF replacement.

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