scholarly journals EFFECT OF POLYPROPYLENE FIBER ON PROPERTIES OF GEOPOLYMER CONCRETE BASED METAKOLIN

2021 ◽  
Vol 25 (02) ◽  
pp. 58-67
Author(s):  
Zainab A. Mohammed ◽  
◽  
Layth A. Al-Jaberi ◽  
Arshad N. Shubber ◽  
◽  
...  
Keyword(s):  
Global Warming ◽  
Portland Cement ◽  
Polypropylene Fiber ◽  
Cement Industry ◽  
Geopolymer Concrete ◽  
Fiber Volume ◽  
Flexural Performance ◽  
Comparable Performance ◽  
Compressive Performance ◽  
Better Than

Climate changes and global warming are an international issue around the world and caused by the accumulation of greenhouse gases, and one of these reasons Portland cement industry which releases high amounts of CO2, which causes 65% of the global warming effect. So the essential component for sustainable development in the construction industry is the improvement of alternatives for cement. One of the promising materials in the field of concrete industry is the geopolymer concrete, which attracted spotlight over the past decade with its comparable performance with Portland cement. This paper presents a systematic review of different research works done in the region of geopolymer concrete based metakoalin reinforced with polypropylene fiber and under ambient temperature. The mechanical behavior was enhanced significantly through experimental results. The compressive strength was improved 14.75% with 1% of polypropylene fiber while the increment of splitting tensile strength was 12.3 %, 15.76 % respectively. The flexural strength of specimens was also improved when compared with the non-fiber geopolymer concrete. The highest increment obtained with 1.5% of fiber volume content was 27.3%. Modulus of elasticity was also improved with increment to 13.1%, when compared with the non-fiber geopolymer concrete, also from experiment adding of fibers lead to a decrease in the density of GPC. The compressive performance and flexural performance of fiber-reinforced geopolymer concrete were also better than specimens without fiber

scholarly journals Assessment of Performance of Fiber Reinforced Geopolymer Composites by Experiment and Simulation Analysis

2019 ◽  
Vol 9 (16) ◽  
pp. 3424 ◽  
Author(s):  
Khoa V. A. Pham ◽  
Tan Khoa Nguyen ◽  
Tuan Anh Le ◽  
Sang Whan Han ◽  
Gayoon Lee ◽  
...  
Keyword(s):  
Steel Fiber ◽  
Simulation Analysis ◽  
Polypropylene Fiber ◽  
Experimental Results ◽  
Fiber Types ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Element Analysis ◽  
Geopolymer Composites

In this work, the experimental and simulation analysis of the performance of geopolymer composites reinforced with steel fiber and polypropylene fiber is investigated. By embedding hooked end steel fiber and polypropylene fiber with various volume fractions of 0%, 0.5%, 1%, 1.5% to the geopolymer concrete mixture, the mechanical behavior was enhanced significantly through experimental results. The compressive strength was improved 26% with 0.5% of polypropylene fiber and 46% with 1% of hooked end steel fiber while the increment of splitting tensile strength was 12% and 28%, respectively. The flexural strength of specimens using two fiber types was also improved when compared with the non-fiber geopolymer concrete. The highest increment obtained with 1.5% of fiber volume content was from 26% to 42%. The compressive performance and flexural performance of fiber-reinforced geopolymer concrete were also better than specimens without fiber, with a higher load carrying capacity, higher stress, higher toughness and smaller strain. Using hooked end steel fiber resulted in better mechanical strength than using polypropylene fiber, and the presence of fibers is an important factor related to the strength improvements. A finite element analysis was modeled by the ANSYS program, and this showed that the load–deflection response and crack patterns also agreed quite well with experimental results.

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 Studying the behavior of geopolymer concretes under repeated loadings

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Osamah M. G. Al-Kerttani ◽  
Ammar Mutar
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Dynamic Loading ◽  
Brittle Material ◽  
Volume Content ◽  
Polypropylene Fiber ◽  
Statistical Test ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume

AbstractThis article investigates utilization of polypropylene microfibers as reinforcement in geopolymer concrete to enhance the ductility characteristics since the geopolymer concrete is considered a brittle material. The polypropylene microfibers were added to geopolymer concrete at the fiber volume content of 0.5%, 1.0%, and 1.5%. In this article, a slump test and compressive strength were tested for geopolymer concretes to measure the effect of polypropylene microfibers on geopolymer concretes. Also, static flexural strength and dynamic loading were applied to find out the attitude of polypropylene fiber-reinforced geopolymer concrete and to measure both the deflection and number of load cycles until failure. While comparing the results with reference geopolymer concrete, all samples were tested at 28 days and, finally, a statistical test was carried out. The results concluded that the use of polypropylene microfibers improves the compressive strength and enhances the properties of polypropylene fiber-reinforced geopolymer concretes, increases the loading for the appearance of the first crack, and decreases the deflection of polypropylene fiber-reinforced geopolymer concretes compared with reference geopolymer concrete.

Review on Alkali-Activated Fly Ash Based Geopolymer Concrete

2016 ◽  
Vol 841 ◽  
pp. 162-169 ◽  
Author(s):  
Kefiyalew Zerfu ◽  
Januarti Jaya Ekaputri
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Construction Material ◽  
Geopolymer Concrete ◽  
Portland Cement Concrete ◽  
Carbon Credit ◽  
Cement Concrete ◽  
Carbon Dioxide Co2 ◽  
Alkali Activated ◽  
Better Than

Due to environmental pollution form cement industries, some efforts for alternative construction material are increasing. Recently, geopolymer concrete has drawn attention of researchers and engineers because of its lower carbon print and better mechanical property over Portland cement concrete. According to previous studies, geopolymer concrete results almost up to 90% reduction in carbon dioxide (CO2) emission to atmosphere. Mechanical properties of geopolymer concrete such as compressive strength, durability, sulfate resistance, early strength and low shrinkage are better than Portland cement concrete. In addition, the appropriate usage of one ton of fly ash earns one carbon-credit redemption value of about 20 Euros, and hence earned monetary benefits through carbon-credit trade.Therefore, this paper presents a review on the fly ash-based geopolymer concrete. The paper mainly covers composition, mixing and curing process, benefits, limitations and applications of alkali activated fly ash based geopolymer concrete.

scholarly journals Life Cycle Assessment of Ordinary Portland Cement (OPC) Using both Problem Oriented (Midpoint) Approach and Damage Oriented Approach (Endpoint)

2021 ◽  
Author(s):  
Busola D. Olagunju ◽  
Oludolapo A. Olanrewaju
Keyword(s):  
Global Warming ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Impact ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Industry ◽  
The World ◽  
Clinker Production ◽  
Oriented Approach

The concern for environmental related impacts of the cement industry is fast growing in recent times. The industry is challenged with high environmental impact which spans through the entire production process. Life cycle assessment (LCA) evaluates the environmental impact of product or process throughout the cycle of production. This can be done using either or both midpoint (process-oriented) and endpoint (damage-oriented) approaches of life cycle impact assessment (LCIA). This study assessed the environmental impact of 1 kg Ordinary Portland Cement (OPC) using both approaches of LCIA. This analysis was carried out using a data modeled after the rest of the world other than China, India, Europe, US and Switzerland. The dataset was taken from Ecoinvent database incorporated in the SimaPro 9.0.49 software. The result of the analysis showed that clinker production phase produced the highest impact and CO2 is the highest pollutant emitter at both endpoint and midpoint approaches. This is responsible for global warming known to affect both human health and the ecosystem. Also, toxicity in form of emission of high copper affects the ecosystem as well as humans. In addition, high fossil resources (crude oil) are consumed and pose the possibility for scarcity.

The Portland Cement Industry of the World

1898 ◽  
Vol 46 (1192supp) ◽  
pp. 19108-19109
Author(s):  
Bernard L. Green
Keyword(s):  
Portland Cement ◽  
Cement Industry ◽  
The World

Utilization of petroleum sludge wastes for increasing productivity of ordinary portland cement

2021 ◽  
Vol 19 (4) ◽  
pp. 315-328
Author(s):  
N.M. Khalil ◽  
Yousif Algamal
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Production Capacity ◽  
Hydration Product ◽  
High Energy ◽  
Cement Industry ◽  
Blended Cements ◽  
Petroleum Waste ◽  
Waste Sludge ◽  
Suitable Amount

This work aims at maximum exploitation of petroleum waste sludge as additive to portland cement to prepare blended cements and hence increasing its production capacity without further firing. This will decrease the main cement industry problems involving environmental pollution such as releasing gases and high-energy consumption during industry and hence maximizes the production economics. Six batches of ordinary portland cement (OPC) mixed with different proportions of petroleum waste sludge (PWS) donated as C1 (control batch contains no PWS), C2 (contains 90 wt.% of OPC+10 wt.% of PWS), C3 (contains 80 wt.% of OPC+20 wt.% of PWS), C4 (contains 70 wt.% of OPC+30 wt.% of PWS), C4 (contains 60 wt.% of OPC+40 wt.% of PWS) and C6 (contains 50 wt.% of OPC+50 wt.% of PWS), were prepared and mixed individually with the suitable amount of mixing water. Cement mixes C2, C3 and C4 showed improved cementing and physicomechanical properties compared with pure cement (C1) with special concern of mix C4. Such improvement is due to the relatively higher surface area as well as the high content of kaolinite and quartz in the added PWS (high pozzalanity) favoring the hydration process evidenced by the increase in the cement hydration product (portlandite mineral (Ca (OH) 2).

Effects of Two Polypropylene Fibers on the Properties of High Strength Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1328-1331
Author(s):  
Bai Rui Zhou ◽  
Dong Dong Han ◽  
Jian Hua Yang ◽  
Yi Liang Peng ◽  
Guo Xin Li
Keyword(s):  
Portland Cement ◽  
Modulus Of Elasticity ◽  
High Strength Concrete ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Strength Concrete ◽  
Reticular Fiber ◽  
Binder Ratio ◽  
Water To Binder Ratio

Portland cement, crushed stone, sand and superplasticizer were used to obtain a high strength concrete with a low water to binder ratio. A reticular polypropylene fiber and a single polypropylene fiber were used to improve the strength of the high strength concrete, but the effects of the two fibers on the slump and strengths were quite different. The reasons of the differences were the surface area and the modulus of elasticity of the fibers. The results show the reticular fiber was better to used in high strength concretes.

scholarly journals Climate Change Disclosures in the Annual Reports: Evidence from Bangladesh

2017 ◽  
Vol 9 (2) ◽  
pp. 88
Author(s):  
Pappu Kumar Dey ◽  
Mohammad Nakib ◽  
Probal Dutta
Keyword(s):  
Climate Change ◽  
Water Management ◽  
Global Warming ◽  
Content Analysis ◽  
Energy Saving ◽  
Banking Industry ◽  
Stock Exchange ◽  
Listed Companies ◽  
Cement Industry ◽  
Annual Reports

This study examines the nature and extent of climate change disclosures in the corporate annual reports of the listed companies in Dhaka Stock Exchange, Bangladesh. For this purpose, annual reports related to the year 2014 of the sample 88 listed companies have been scrutinized. In regard to this study, content analysis approach has been conducted considering thirteen different disclosure issues regarding climate change. Our analysis provides the comprehension of below average climate change disclosure practices by the Bangladeshi companies, though 58 percent companies have reported at least one issue on climate change and global warming. ‘Energy saving & efficiency’ and ‘water management & pollution’ are mostly reported issues that are industry specific requirements in some case. From the viewpoint of industry, Banking industry and Cement industry have started to report some issues related to the climate change, where 4 industries out of selected 17 industries have not provided any climate change disclosure. Disseminating climate change disclosure within 10 sentences by most of the reported companies manifests the desideratum of in-depth disclosure practices.

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