scholarly journals Concrete sustainability with very high amount of fly ash and slag

2009 ◽  
Vol 2 (3) ◽  
pp. 244-253 ◽  
Author(s):  
G. C. Isaia ◽  
A. L. G. Gastaldini
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Ternary Mixtures ◽  
Sustainable Construction ◽  
Concrete Mixtures ◽  
Binary And Ternary Mixtures ◽  
Concrete Mix ◽  
Mineral Additions ◽  
The Mean ◽  
The Cost

This article approaches concrete mix designs where cement is replaced by high amounts of slag and fly ash, with the purpose of turning it into a more sustainable construction material, that is, an authentic green concrete. Mix proportions with fly ash, ground-blasted furnace slag, and Portland cement were studied in binary and ternary mixtures for compressive strength levels of 40 MPa and 55 MPa. The replacement of cement with mineral additions ranged from 50% to 90% in mass. Mean decreases of 55% in the energy consumption, 78% in the CO² emissions, and 5% in the cost of the concrete m³, plus an increase of 40% in the mean index of durability were obtained, all ofwhich compared to the 40-MPa reference concrete. This study attests the technical, economical and environmental potentialities for theuse of concrete mixtures with until 90% of fly ash.

scholarly journals Effects of microbial agents to the properties of fly ash-based paste

2018 ◽  
Vol 195 ◽  
pp. 01012
Author(s):  
Kiki Dwi Wulandari ◽  
Januarti Jaya Ekaputri ◽  
Triwulan ◽  
Chikako Fujiyama ◽  
Davin H. E. Setiamarga
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Cement Paste ◽  
Construction Material ◽  
Concrete Strength ◽  
Self Healing ◽  
Concrete Mixtures ◽  
Microbial Agents ◽  
Portland Cement Paste ◽  
Geopolymer Paste

Specific microbial agents such as bacteria are often used in concrete to improve its performance. Some microbes act as self-healing agents to close cracks in concrete, and to increase concrete strength. This paper presents a study to observe the effects of microbe addition to two types of concrete mixtures the fly ash-based, as geopolymer paste, and portland cement paste containing fly ash. Furthermore, the investigation was conducted to compare the properties of each paste, such as its compressive strengths, specific gravities, porosity, microstructures, and XRay diffracting properties. The results indicate that microbial activities positively affected the properties of both, portland cement paste and geopolymer paste. The result reported here strongly suggests that fly ash can be used to produce a high quality, but environmental friendly construction material when it’s mixed together with useful microbes.

scholarly journals Development of Fly ash-GGBS based Self Compacting Geopolymer Concrete: a Review

2019 ◽  
pp. 373-377
Author(s):  
Vinothkumar A ◽  
Kalaivani M ◽  
Easwaran P
Keyword(s):  
Global Warming ◽  
Fly Ash ◽  
Construction Material ◽  
Cement Industry ◽  
Test Method ◽  
Sustainable Construction ◽  
Ring Test ◽  
Modern World ◽  
Geopolymer Concrete ◽  
By Products

Concrete is the most used construction material in construction Industries all over the world. The main binding ingredient of concrete that is ordinary Portland cement is a major contributor of global warming. The cement industry is the second largest producer of the green house gas. The total world production of cement is expected to be around 4800 Mt by 2030, which clearly indicates the like impact on global warming indicates. In this regard, Utilization of industrial by-products from various industries as supplementary cementations material in concrete along with cement has been well recognized for its enhanced properties and potential to reduce environmental impacts. Self compacting Geopolymer concrete is a relatively new concrete, which can be a sustainable and Economical construction material as it is produced from combination of industrial by-products such as Fly ash and Ground Granulated Blast Furnace Slag replacing 100% of cement in concrete. Self compacting Geopolymer concrete is a special type of concrete which can be placed and consolidated under its own weight without any vibration and which at the same time is cohesive enough to be handled without segregation or bleeding. The self compacting geopolymer concrete such as filing ability passing ability and segregation resistance are estimated by using slump flow, V-Funnel, L-Box and J-ring test method for fresh state concrete. Hence Self-compacting Geopolymer concrete is the sustainable construction material in the modern world by solving current issues of pollution.

scholarly journals Evaluating the efficiency of the fluidity retention of ready-mix concrete during the transportation of it to the construction site

2018 ◽  
Vol 230 ◽  
pp. 03005
Author(s):  
Oleksii Kabus ◽  
Larisa Butska ◽  
Olga Makarenko ◽  
Lidiya Pershina ◽  
Andriy Tymoshchenko
Keyword(s):  
High Water ◽  
Construction Site ◽  
Chemical Additives ◽  
Concrete Mixtures ◽  
Individual Solution ◽  
Concrete Mix ◽  
Gradual Introduction ◽  
The Cost ◽  
Ready Mix Concrete

The work is devoted to the study of changes in the time of mobility of concrete mixtures, which are used for commercial concrete with monolithic construction. The in-situ concrete quality depends on the uniformity, viability and workability of the concrete mix intended for the transportation, unloading and workability at the construction site. One of the techniques used for the solution of this problem can be step-by-step addition of chemical admixtures or introduction of setting retarders whose efficiency is expressed in an increased resiliency of the concrete mix that is extended by two and more hours. Each solution has its advantages and drawbacks; therefore the efficiency can only be estimated under specific conditions taking into account the cost of concrete mix and opportunities for the realization of each individual solution. Were received results showing the presence of a problem of mobility loss of concrete mixtures with chemical additives of high water-reducing action. The use of such technological techniques as increasing the initial mobility and gradual introduction of supplements to superplasticizer proved to be effective technological solutions.

scholarly journals Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustainable Construction Material

2019 ◽  
Vol 11 (12) ◽  
pp. 3481 ◽  
Author(s):  
Manfredi Saeli ◽  
Luciano Senff ◽  
David Maria Tobaldi ◽  
Giada La Scalia ◽  
Maria Paula Seabra ◽  
...  
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Cost Effective ◽  
External Source ◽  
Sustainable Construction ◽  
Paper Pulp ◽  
Curing Conditions ◽  
Waste Reuse ◽  
Pulp Industry ◽  
Biomass Fly Ash

Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-pulp industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.

Behaviour of Fly Ash and Rice Husk Ash Based Geopolymer Concrete

2018 ◽  
Vol 775 ◽  
pp. 596-602
Author(s):  
Saraswati Verma ◽  
Mayank Kumar
Keyword(s):  
Fly Ash ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Construction Material ◽  
Sustainable Construction ◽  
Geopolymer Concrete ◽  
Waste Products ◽  
Ambient Exposure ◽  
Heat Curing ◽  
Naoh Solution

Geopolymer Concrete (GPC) is a novel concrete which has evolved in recent decades. It uses industrial waste products like fly ash (FA), ground granulated blast slag (GGBS), Rice husk ash (RHA), micro-silica, and red mud etc., from industries, with alkaline liquids to replace cement in concrete by 100%, thereby developing an eco-friendly and sustainable construction material and simultaneously reducing waste disposal problem of fly ash and rice husk ash. GPC not only possesses excellent mechanical properties it also have very good durability properties. This paper presents the effect of partial replacements of fly ash with rice husk ash on the properties of geopolymer concrete. Mixes chosen for investigation were GPC-1, GPC-2, GPC-3, GPC-4, and GPC-5 containing respectively 0%, 5%, 10%, 15%, and 20% RHA in place of FA. Various synthesis parameters like alkaline liquid to source material ratio, molarity of NaOH solution, sodium silicate to sodium hydroxide ratio were kept at their optimum values of 0.45, 12M, and 2.5 respectively. Heat curing was given to specimens by dry oven curing for initial 24 hours at a specified temperature of 70°C, and then ambient exposure was given to the test specimens for periods of 3, 7, 28, and 90 days respectively. Results of tests conducted have been discussed in detail.

scholarly journals Potency Variation Analysis of Fly Ash and GGBS with Micro (Polypropylene) Fiber for M45 Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 4968-4975
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Polypropylene Fiber ◽  
Cement Concrete ◽  
Huge Amount ◽  
Binding Material ◽  
The Cost ◽  
Cost Of Construction ◽  
Good Workability ◽  
Very High

Concrete a widely used, strong and versatilely mould able construction material consist of binding material, aggregates, and water. Concrete can be made of different binding materials but in the present scenario cement concrete is the most preferable concrete all over the world. Due to globalization and industrialization, the infrastructure growth is at a faster rate, which requires a huge amount for development. One of such overused construction material is cement concrete, the survey indicates that the concrete is the world's second most consumed material, after water. It shows that material consumption for the preparation of concrete is very high. Which will directly lead to overuse of natural resources, increasing environmental pollution and also raise the cost of construction The experimental investigation of OPC-53 grade replacement by GGBS 5%, 10%, 15%, 20%, 25% and fly ash 5%, 10%, 15%, 20%, 25% then also adding polypropylene microfiber 1%. Tests on fresh properties and harden properties like compression, Tensile strength, Flexural strength was conducted. Superplasticizer was used to have good workability for all replacement levels. The mix design is carried out for M45 grade of concrete as per, IRC 44-2008

scholarly journals Studies on Mechanical properties of High Calcium Fly ash based sustainable Geopolymer concrete

2021 ◽  
Vol 2070 (1) ◽  
pp. 012184
Author(s):  
B Vijaya Prasad ◽  
N Anand ◽  
P D Arumairaj ◽  
M Sanath Kumar ◽  
T Dhilip ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Construction Material ◽  
Sustainable Construction ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
High Calcium ◽  
Major Interest ◽  
High Calcium Fly Ash

Abstract Geopolymer concrete (GPC) is a Sustainable construction material, in which cement is completely replaced by Fly ash as binder. To control emission of CO2 during the production of cement, it is advisable to use alternate sustainable Cementitious material. The development of GPC become a major interest to use for in-situ and precast applications. The present study aims to develop High calcium fly ash based GPC with aid of alkaline liquids such as sodium Hydroxide (NaOH) and Sodium silicate (Na2SiO3). Different molarities i.e 4M, 6M, 8M and 10M are used to develop the GPC under ambient and oven curing process. In the present investigation the Fresh properties of GPC and Mechanical properties such as compressive strength, Tensile strength, Flexural strength and Elastic modulus of GPC are investigated. An increase of alkaline activator in in the mix decreased the workability of GPC. The developed GPC mix of 8M is found to be the optimum for gain in compressive strength. A polynomial relationship is obtained for the mechanical properties of GPC developed under ambient and oven curing. The development cost of GPC can be reduced up to 11.25 to 16.5% as compared with conventional concrete grade of M25.

scholarly journals Mechanical and Durability Characteristics of Eco-Friendly Fly Ash Bricks

2021 ◽  
Vol 9 (11) ◽  
pp. 1381-1385
Author(s):  
Chidananda G
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Raw Materials ◽  
Construction Material ◽  
Hydraulic Press ◽  
Homogeneous Mixture ◽  
Sustainable Construction ◽  
Stone Dust ◽  
Codal Provisions

Abstract: This paper presents an experimental investigation carried out on eco-friendly fly ash bricks having various percentage of fly ash, lime, gypsum, stone dust, coarse aggregate and boiler slag. Raw materials are added to the pan mixer with different mix proportions and are mixed thoroughly with water until a homogeneous mixture is formed. Prepared homogeneous mixture is fed into the press and moulded to a brick of size 200 x 200 x 300 mm using vibro-hydraulic press. Moulded bricks are air dried for 24 hours, arranged in stacks and are cured for a period of 28 days by sprinkling the water to achieve the optimum strength. Compressive strength, water absorption, efflorescence, dimension tolerance and density tests are conducted as per BIS codal provisions. Eco friendly fly ash bricks having varying proportions of industrial by-products with less content of stone dust satisfy compressive, water absorption, efflorescence, dimensional tolerance and density requirements as per BIS codal provisions and can be used in structures as a sustainable construction material. Keywords: Eco-friendly fly ash bricks, Compressive strength, Water absorption, Efflorescence, Dimension tolerance and Density

Fresh and Mechanical Properties of Zero-Cement One-Part Geopolymer Mortar and Concrete

2019 ◽  
Author(s):  
Md. Mashfiqul Islam ◽  
Ahmed A. Gheni ◽  
Mohamed A. ElGawady
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Sustainable Construction ◽  
Environmental Damage ◽  
Fresh Properties ◽  
Steam Curing ◽  
Steady Level ◽  
Different Sources ◽  
Alkali Activated ◽  
Construction Works

<p>The era of research on fly ash based Zero-Cement (ZC) containing alkali activated geopolymer mortar and concrete has already begun. By replacing 100% of cement which is the higher carbon footprint material and also by maintaining a steady level on eco-system without causing severe environmental damage or exhausting natural resources, geopolymer technology is on the way to be the most popular sustainable construction material. However, the mixing mechanism of geopolymer is very difficult using the liquid alkaline activators which are hazardous as well as difficult to handle in large construction works at sites. As a result, the development of producing one-part geopolymer or “just add water” process similar to ordinary</p><p>Portland cement (OPC) construction, is necessary for the promotion of this green and sustainable</p><p>construction material to the society. To this end, two different sources of Class C fly ash (FA) from Missouri State, USA are used in this study to investigate the mechanical as well as the fresh properties of ZC mortar and concrete. In this study, the dry sodium hydroxide (SH) pellets and sodium silicate (SS) powder are used as solid alkaline activators. Three different curing systems, e.g. ambient, oven and steam curing are employed in this study and corresponding strength gains are evaluated. A significant enhancement of the compressive strength was achieved by the addition of 1.9 mass% of sucrose (sugar) with respect to FA in the mix after curing at the elevated temperature.</p>

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