Influence of Metakaolin, Fly Ash and Nano Silica on Mechanical and Durability Properties of Concrete

2017 ◽  
Vol 744 ◽  
pp. 8-14 ◽  
Author(s):  
Rabinder Kumar ◽  
Airil Yasreen B. Mohd Yaseen ◽  
Nasir Shafiq ◽  
Asif Jalal
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Construction Material ◽  
Research Work ◽  
Nano Silica ◽  
Durability Properties ◽  
Pozzolanic Material ◽  
Steel Bar ◽  
Extended Approach ◽  
Mechanical Durability

Concrete is widely used construction material for the development of built environment which consumes huge amount of cement, around 4.3 billion metric ton all over the world. Reinforced concrete construction exposed to harsh environment such as chloride bound air causes deterioration in concrete through its pore structure by corroding the steel bar. The use of pozzolanic material i.e. metakaolin (MK), fly ash (FA), silica fume (SF), nano silica (NS) can be used as partially cement replacing material which not only reduces the pores in concrete but improves the mechanical, durability properties and microstructure of concrete. This paper reviews various transport mechanisms involved in ingress of deleterious material and incorporation of MK, FA and NS in concrete and their effects on concrete mechanical and durability properties. However, the research work provides an extended approach to evaluate combine effect using MK, FA, and NS and to produce a concrete with more refined pore structure for aggressive environment.

Influence of Nano-Silica Dosage on Properties of Cement Paste Incorporating with High Calcium Fly Ash

2020 ◽  
Vol 841 ◽  
pp. 9-13
Author(s):  
Teewara Suwan ◽  
Peerapong Jitsangiam ◽  
Prinya Chindaprasirt
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Cement Paste ◽  
Construction Material ◽  
Internal Heat ◽  
Nano Silica ◽  
Industrial Sectors ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Cement And Concrete

Nanotechnology is receiving widespread attention in many industrial sectors, including construction material industry. One of the nano-scale admixtures, which has the potential to enhance the performance of cement and concrete, is known as Nano-silica (n-SiO2). In general, fly ash (FA) is currently used in cement and concrete industry for replacing the consumption of Portland cement (OPC) to reduce its production cost as well as to improve some specific required properties, e.g., workability or low internal heat liberation. However, the strength of hardened Portland cement is normally decreased when a higher amount of fly ash is presented. This research article is therefore pointed on the influence of nano-silica dosage on the properties of cement paste incorporating with high calcium fly ash. Seven different proportions of OPC:FA were prepared viz. 100:0, 80:20, 60:40, 50:50, 40:60, 20:80 and 0:100 by weight. The commercial grade nano-silica (in liquid form) was used as an admixture in those mixes by 0.0, 0.5, 1.0 and 1.5 wt% of the mixing water with a water-to-binder (w/b) ratio of 0.30. The results indicated that the addition of n-SiO2 improved the compressive strength of all mixtures (with and without high calcium FA) as the presence of n-SiO2 can be a source of silica and easily contribute to an additional formation of CSH in the cementing system, confirmed by the results of XRD analysis. The main findings show a potential approach of using n-SiO2 as an admixture for cement and concrete construction.

scholarly journals An Investigation on Durability and Ductulity of Concrete using Fly Ash and Fibre Glass

2020 ◽  
Vol 6 (7) ◽  
pp. 170-174
Author(s):  
Eedi Divya , Ch Bhaskara Teja
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Glass Fibers ◽  
Research Work ◽  
Fibre Glass ◽  
Durability Properties ◽  
Cement Manufacturing ◽  
The Look ◽  
Energy Plants

Concrete enterprise is dealing with the environmental impact, via the emission of CO2 while cement manufacturing. Cement partly replaced with pozzolanic waste fabric like fly ash reduces the freeing of CO2. Fly ash is made of thermal energy plants. Due to the usage of glass fibers to standard concrete has a big compressive strength and flexural Strength. This research work deals the look at of different grades (M30, M40) of GFRC by means of partial substitute of cement with fly ash. In keeping with mix proportions, standard sizes of specimens are casted that allows you to locate the durability properties, ductility and flexural power? Durability properties are performed with the aid of checking out the specimens for sulphate and acid assaults. Whereas ductility and flexural energy is received from pressure-pressure curves. And acquired results are as compared to traditional concrete. Its miles been determined from this research is that, ductility, sturdiness and flexural electricity is higher for GFRC than traditional concrete.

scholarly journals Fly Ash Based Geopolymer Mortar - Carbonation and Microstructural Performance

2020 ◽  
Vol 8 (5) ◽  
pp. 1181-1186
Keyword(s):  
Fly Ash ◽  
Ordinary Portland Cement ◽  
Construction Material ◽  
Curing Temperature ◽  
Sodium Hydroxide Concentration ◽  
X Ray ◽  
Pozzolanic Material ◽  
Binder Ratio ◽  
Current Production ◽  
Scanning Electron

Concrete is the construction material of highest exigency which, in turn, created a huge demand for ordinary Portland cement as a binder. Regrettably, its current production process is highly energy intensive, and at elevated temperature, when Calcination of Limestones takes place, it liberates embodied anthropogenic CO2 polluting the environment. Not only that, but it is also user-hostile and comparatively costly too. Therefore, construction industries looking at concrete research sectors to invent new, environmentally- compassionate durable, sustainable and cheap construction and binding materials instead of present ones. Nowadays, Geopolymer binders and composites are synthesized by activating alkali solution with Silica and Alumina rich pozzolanic material such as Fly ash, have emerged out as a brilliant substitute to conventional binders and composites through the process of Geopolymerization. The objective of the present study is to investigate the performance of Fly ash based geopolymer mortar in whereby there is 100% substitution of cement by Fly ash, i.e., the absolute absence of cement. The present study has examined the mix composition parameters comprise Sodium hydroxide concentration and aggregate to binder ratio, whereas process parameter included curing temperature. Also, the Carbonation tests were conducted along with microstructure investigations viz., X-Ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM).

An Experimental Study on the Self-Consolidating Concrete (SCC) under Hot Weather and Hauling Time

2016 ◽  
Vol 677 ◽  
pp. 3-7 ◽  
Author(s):  
Samer Al Martini ◽  
Mohamed Al Khatib
Keyword(s):  
Fly Ash ◽  
United Arab Emirates ◽  
Construction Material ◽  
Mixing Time ◽  
Weather Conditions ◽  
Construction Sites ◽  
Self Consolidating Concrete ◽  
Durability Properties ◽  
Hot Weather ◽  
Concrete Placement

Self-consolidating-concrete (SCC) has gained wide acceptance in the construction industry given its ability to reduce construction duration and cost. All ready-mix concrete commonly used in hot weather countries, such as United Arab Emirates (UAE), is subjected to continuous agitation during hauling to construction sites. Prolonged mixing, especially at high temperatures can lead to loss of workability and increased difficulties for concrete placement and consolidation. This may result in lower mechanical and durability properties. In this paper, the mechanical and durability properties of self-consolidating concrete (SCC) under hot weather conditions were investigated. Mixing and testing were conducted outdoor at the construction material lab of Abu Dhabi University during last summer of 2014. The test results showed that the mixing time and hot weather adversely affected the fresh properties. The SCC mixtures were continuously mixed for 2 hours under a temperature ranged from 25 to 40 °C, to simulate concrete in a transit truck during transportation to a construction site under hot weather. Polycarboxylate-based high-range water-reducing admixture (PC) and fly ash were incorporated in the investigated SCC mixtures. The results showed that both the compressive strength and durability of SCC were highly affected by fly ash dosage and temperature.Keywords: Hot weather; hauling time, self-consolidating concrete.

scholarly journals Performance of Crumb Rubber Incorporated Ferro Geopolymer Panels under Flexure

2019 ◽  
Vol 8 (4S2) ◽  
pp. 127-133
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Construction Material ◽  
Research Work ◽  
Base Material ◽  
Crumb Rubber ◽  
Absorption Capacity ◽  
Industrial Wastes ◽  
Partial Substitution ◽  
Metal Mesh

This research work presents the overview of geopolymer mortar application into the ferro cement panel with the incorporation of crumb rubber and Nano fly ash. The geopolymer mortar is prepared by using industrial wastes as a base material such as fly ash and ground granulated blast furnace slag (GGBFS) which generally helps to reduce the level of CO2 emission. Also, the recycled tyre crumb rubber is utilized as a sustainable innovative construction material which is used a partial substitution for sand upto 5% for enhancing the ductility without any strength degradation. These reduces land fill problems and ground water quality degradation problems. Crumb rubber has the ideal capacity to absorb energy from static and other kind of loads. The geopolymer binder preparation is done by utilizing material such as fly ash, GGBFS, alkaline liquid made of NaOH and Na2SiO3 , Nano fly ash. The Nano fly ash is used as an additive which helps in increasing the strength and durability of the element by its pore filling capability. This project aims to enhance the strength of fly ash based geopolymer mortar with the help of GGBFS incorporation. The molarity of alkaline activator, solution to binder ratio and silicate to hydroxide ratio is fixed as 12, 0.4 and 1.5 throughout the process. The mortar cubes and panels were heat cured under hot air oven at 80ᵒ C for 48 hours. The mechanical behavior of geopolymer mortar is assessed by compressive strength test water absorption test. The panel is made of high strength geopolymer mortar and expanded metal mesh with chicken mesh for obtaining higher energy absorption capacity with good deforming ability and less crack pronouncement. The investigation involves finding the initial crack load, ultimate failure load and residual flexural strength ratio. The results show that the tyre inclusion enhances the flexural strength of the ferro geopolymer panel by means of its ductile enhancing capacity

Durability properties of high volume fly ash concrete containing nano-silica

2014 ◽  
Vol 48 (8) ◽  
pp. 2431-2445 ◽  
Author(s):  
Steve Wilben Macquarie Supit ◽  
Faiz Uddin Ahmed Shaikh
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Nano Silica ◽  
Fly Ash Concrete ◽  
Durability Properties ◽  
High Volume Fly Ash

The Effect of Cassava Starch on the Durability Characteristics of Concrete

2020 ◽  
Vol 14 (1) ◽  
pp. 289-301
Author(s):  
Daniel Oni ◽  
John Mwero ◽  
Charles Kabubo
Keyword(s):  
Cement Hydration ◽  
Research Work ◽  
Cassava Starch ◽  
Chloride Penetration ◽  
Hardened Concrete ◽  
Sulphate Attack ◽  
Marine Structures ◽  
Durability Properties ◽  
Chloride Attack ◽  
Starch Gel

Background: Concrete is a common material used in the construction of marine structures, such as bridges, water treatment plants, jetties, etc. The use of concrete in these environment exposes it to attack from chemicals like sulphates, chlorides and alkaline, thereby causing it to deteriorate, and unable to perform satisfactorily within its service life. Hence, the need to investigate the durability properties of concrete has become necessary especially when admixtures are used to modify some of its properties. Objective: This research work investigates the effect of Cassava Starch (CS) on the durability characteristics of concrete. Methods: The durability properties investigated in this work are water absorption, sorptivity, resistance to sulphates, sodium hydroxides and chloride penetration. The specimens were prepared by adding CS by weight of cement at 0.4, 0.8, 1.2, 1.6 and 2.0% respectively. The concrete specimens were cured for 28 days, tested for compressive strength before ponding in ionic solutions of sodium hydroxide, sulphuric acid and sodium chloride. Six (6) concrete mixes were prepared, five of which were used to evaluate the effect of CS on the durability characteristics of concrete. Results: The slump values reduced with the increasing dosage of CS due to the viscous nature of the CS paste. Generally, the addition of CS in concrete tends to improve the resistance of concrete to sulphate and chloride attack due to the ability of the muddy-like starch gel to block the pore spaces of hardened concrete, hence, reduces the rate at which water and other aggressive chemicals penetrate the concrete. In addition, the retarding ability of CS impedes the formation of mono-sulphate aluminates during cement hydration, thereby making the concrete less susceptible to sulphate attack. Conclusion: The addition of CS to concrete by weight of cement generally improved the durability characteristics of concrete, while the relative performances of the concrete mixes showed that CS 2.0 gave a better resistance to chloride penetration and sulphate attack.

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