Comparison of fly ash, silica fume and metakaolin from mechanical properties and durability performance of mortar mixtures view point

This paper aimed to investigate the mechanical characteristics of HSC of M60 concrete adding 25% of fly ash to cement and sand and percentage variations of silica fumes 0%,5% and 10% to cement with varying sizes of 10mm,6mm,2mm and powder of granite aggregate with w/c of 0.32. Specimens are tested for compressive strength using 10cm X 10cmX10cm cubes for 7,14,28 days flexural strength was determined by using 10cmX10cmX50cm beam specimens at 28 days and 15cm diameter and 30cm height cylinder specimens at 28 days using super plasticizers of conplast 430 as a water reducing agent. In this paper the experimental set up is made to study the mechanical properties of HSC with and without coarse aggregate with varying sizes as 10mm, 6mm, 2mm and powder. Similarly, the effect of silica fume on HSC by varying its percentages as 0%, 5% and 10% in the mix studied. For all mixes 25% extra fly ash has been added for cement and sand.

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Effect of fly ash/silica fume ratio and curing condition on mechanical properties of fiber-reinforced geopolymer

Journal of Sustainable Cement-Based Materials ◽

10.1080/21650373.2019.1709999 ◽

2020 ◽

Vol 9 (4) ◽

pp. 218-232 ◽

Cited By ~ 2

Author(s):

Piti Sukontasukkul ◽

Prinya Chindaprasirt ◽

Phattharachai Pongsopha ◽

Tanakorn Phoo-Ngernkham ◽

Weerachart Tangchirapat ◽

...

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Silica Fume ◽

Fiber Reinforced ◽

Curing Condition

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MECHANICAL PROPERTIES OF FLY ASH-BASED ALKALI-ACTIVATED CEMENT USING A STATISTICAL ANALYSIS TECHNIQUE

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2014.38 ◽

2014 ◽

Vol 1 (1) ◽

Author(s):

Hyuk Lee ◽

Vanissorn Vimonsatit

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Statistical Analysis ◽

Fly Ash ◽

Silica Fume ◽

Dry Density ◽

Analysis Method ◽

Solid Ratio ◽

Alkali Activated ◽

Alkali Activated Cement

This paper presents the mechanical properties of fly ash-based alkali-activated cement (AAC). A statistical analysis method was used to determine the effect of mix proportion parameters on the dry density and compressive strength of fly ash-based AAC pastes and mortars. For that purpose, sample mixtures were designed according to Taguchi’s experimental design method, i.e., in a L9 orthogonal array. Four factors were selected: “silica fume content” (SF), “sand to solid ratio” (s/c), “liquid to solid ratio” (l/s), and “superplasticiser content” (SP). The experimental results were analysed by using signal to noise for quality control of each mixture, and analysis of variance (ANOVA) was used to determine the significant effect on the compressive strength of fly ash-based AAC. Furthermore, a regression-analysis method was used to predict the compressive strength according to the variation of the four factors. Results indicated that silica fume is the most influencing parameter on compressive strength, which could be decreased by superplasticiser and l/s ratio. There is no significant effect of sand-to-cementitious ratio on compressive strength of fly ash-based AAC. The dry density decreases as the sand-to-cementitious ratio is decreased. The increasing l/s ratio and superplasticiser dosage could further decrease the dry density of fly ash-based AAC.

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Effect of steel slag powder, fly ash, and silica fume on the mechanical properties and durability of cement mortar

Materials Express ◽

10.1166/mex.2019.1587 ◽

2019 ◽

Vol 9 (9) ◽

pp. 1049-1054

Author(s):

Yunxia Lun ◽

Fangfang Zheng

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Silica Fume ◽

Cement Mortar ◽

Steel Slag ◽

Mineral Admixtures ◽

Partial Replacement ◽

Slag Powder ◽

Steel Slag Powder

This study is aimed at exploring the effect of steel slag powder (SSP), fly ash (FA), and silica fume (SF) on the mechanical properties and durability of cement mortar. SSP, SF, and FA were used as partial replacement of the Ordinary Portland cement (OPC). It was showed that the compressive and bending strength of steel slag powder were slightly lower than that of OPC. An increase in the SSP content caused a decrease in strength. However, the growth rate of compressive strength of SSP2 (20% replacement by the weight of OPC) at the curing ages of 90 days was about 8% higher than that of OPC, and the durability of SSP2 was better than that of OPC. The combination of mineral admixtures improved the later strength, water impermeability, and sulfate resistance compared with OPC and SSP2. The compressive strength of SSPFA (SSP and SF) at 90 days reached 70.3 MPa. The results of X-ray diffraction patterns and scanning electron microscopy indicated that SSP played a synergistic role with FA or SF to improve the performance of cement mortar.

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Physico-mechanical properties of composite cement pastes containing silica fume and fly ash

HBRC Journal ◽

10.1016/j.hbrcj.2014.02.003 ◽

2015 ◽

Vol 11 (1) ◽

pp. 7-15 ◽

Cited By ~ 23

Author(s):

S.A. Abo-El-Enein ◽

Gamal El-kady ◽

T.M. El-Sokkary ◽

Mahmoud Gharieb

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Silica Fume ◽

Cement Pastes ◽

Composite Cement

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Physical and mechanical characteristics of cement mortars and concretes with addition of clinoptilolite from Beli Plast deposit (Bulgaria), silica fume and fly ash

Clay Minerals ◽

10.1180/claymin.2011.046.2.213 ◽

2011 ◽

Vol 46 (2) ◽

pp. 213-223 ◽

Cited By ~ 6

Author(s):

V. Lilkov ◽

I. Rostovsky ◽

O. Petrov

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Silica Fume ◽

Mechanical Characteristics ◽

Physical And Mechanical Properties ◽

Specific Pore Volume ◽

Cement Mortars ◽

Physical And Mechanical Characteristics

AbstractCement mortars and concretes incorporating clinoptilolite, silica fume and fly ash were investigated for changes in their physical and mechanical properties. It was found that additions of 10% clinoptilolite and 10% Pozzolite (1:1 mixture of silica fume and fly ash) were optimal for improvement of the quality of the hardened products, giving 8% and 13% increases in flexural and compressive strength respectively. The specific pore volume of the mortars incorporating zeolite decreased between the 28th and 180th day to levels below the values for the control composition due to the fact that clinoptilolite exhibits its pozzolanic activity later in the hydration. In these later stages, pores with radii below 500 nm increased at the expense of larger pores. The change in the pore-size distribution between the first and sixth months of hydration occurs mostly in the mortars with added zeolite.

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Comparative Investigations of some Properties Related to Durability of Cement Concretes Containing Different Fly Ashes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1054.154 ◽

2014 ◽

Vol 1054 ◽

pp. 154-161 ◽

Cited By ~ 4

Author(s):

Wojciech Kubissa ◽

Barbara Pacewska ◽

Iwona Wilińska

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Silica Fume ◽

Low Permeability ◽

Concrete Durability ◽

Cement Concrete ◽

Fly Ashes ◽

Chloride Migration ◽

Good Workability

The results of research of mechanical properties and selected other characteristics influencing durability of cement concretes containing cement substitutes were presented. Cement concretes performed with conventional fly ash, fluidised fly ash and their mixture were investigated. The obtained results were compared with findings registered for two types of concrete performed without cement replacements and with cement concrete containing silica fume. The results have shown that cement concrete with predetermined 28-day compressive strength of about 50 MPa and good workability may be obtained using different cement replacements. Generally, these cement concretes exhibited also favorable properties related to concrete durability, i.e. low permeability and sorptivity, and significant reduction of chloride migration coefficient. Favourable results were obtained for cement concrete containing mix of conventional and fluidised fly ashes: good workability, compressive strength after 28th day exceeding 50 MPa, low permeability of water, and low sorptivity, as well as low coefficient of chloride migration. These features were similar as for cement concrete containing silica fume.

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Impact of Silica Nanoparticles on the Durability of fly Ash Concrete

Frontiers in Built Environment ◽

10.3389/fbuil.2021.665549 ◽

2021 ◽

Vol 7 ◽

Author(s):

D. Ali ◽

U. Sharma ◽

R. Singh ◽

L. P. Singh

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Silica Nanoparticles ◽

Silica Fume ◽

Silica Nanoparticle ◽

Fly Ash Concrete ◽

Durability Properties ◽

Concrete Mix

In the present study, the mechanical and durability properties of silica nanoparticle (SNP)-incorporated fly ash (FA) concrete mix were examined after 365 days of exposure. The dosages of FA replaced by cement in the present study were 30%, 40%, and 50%, while 3% SNPs were added by the weight of cement in the FA incorporated mix. For a comparison of SNPs with silica fume (SF), 6% SF was added (by the weight of cement) and entire casting was performed at a constant water to binder (w/b) ratio of 0.29. The present work is the extension of a previous study wherein durability properties of the same mixes were reported for up to 180 days of exposure. Compressive strength results show that in the presence of SNPs, the enhancement in compressive strength was in the range of 10–14%, while, in presence of SF, 8–10% of the enhancement was observed as compared to control. However, exposed samples in a carbonation environment showed that the compressive strength of the control and SF incorporated mix increased, while SNP-incorporated samples showed negligible enhancement. Further, sulphate exposed mix show that compressive strength decreases, however, the SNP-incorporated mix showed the lowest reduction compared to other mixes. Therefore, the study shows that the SNP-incorporated mix has higher mechanical properties and more durability compared to other mixes in a severe environment.

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