Developing Environmentally Sustainable and Cost-Effective Geopolymer Concrete with Improved Characteristics

2021 ◽  
Vol 13 (24) ◽  
pp. 13607
Author(s):  
Alexey N. Beskopylny ◽  
Sergey A. Stel’makh ◽  
Evgenii M. Shcherban’ ◽  
Levon R. Mailyan ◽  
Besarion Meskhi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Cost Effective ◽  
Point Of View ◽  
Strength Characteristics ◽  
Geopolymer Concrete ◽  
Environmental Friendliness ◽  
Fine Grained ◽  
The Individual ◽  
Capital Construction

Improving the efficiency and quality of construction mainly depends on the cost of building materials, which is about 55–65% of total capital-construction costs. The study aimed to obtain geopolymer fine-grained concrete with improved quality characteristics that meet the construction field’s sustainable development criteria and that have environmental friendliness, economic efficiency, and advantages over competing analogues. The dependences of strength characteristics on various compositions of geopolymer concrete were obtained. It was found that the most effective activator is a composition of NaOH and Na2SiO3 with a ratio of 1:2. The increase in the indicators of the obtained geopolymer concrete from the developed composition (4A) in relation to the base control (1X) was 17% in terms of compressive strength and 24% in tensile strength in bending. Polynomial equations were obtained showing the dependence of the change in the strength characteristics of geopolymer concrete on the individual influence of each of the activators. A significant effect of the composition of the alkaline activator on the strength characteristics of geopolymer fine-grained concrete was noted. The optimal temperature range of heat treatment of geopolymer concrete samples, contributing to the positive kinetics of compressive strength gain at the age of 28 days, was determined. The main technological and recipe parameters for obtaining geopolymers with the desired properties, which meet the ecology requirements and are efficient from the point of view of economics, were determined.

scholarly journals Barite-containing radiation protective building materials

2020 ◽  
Vol 21 (1) ◽  
pp. 94-98
Author(s):  
Nikolay V. Novikov ◽  
Svetlana V. Samchenko ◽  
Galina E. Okolnikova
Keyword(s):  
Building Materials ◽  
Protective Coatings ◽  
Relevant Literature ◽  
Cost Effective ◽  
Nuclear Facilities ◽  
Linear Absorption ◽  
Environmental Friendliness ◽  
Operational Characteristics ◽  
Wide Range ◽  
The Creation

Due to the active development of industries using nuclear technology, the creation of highly effective and cost-effective building materials for protection against hazardous ionizing radiation is of increasing interest. Widespread in the field of radiation-protective building materials are barite-containing concrete. The purpose of this article is to establish the prospects of their use in nuclear facilities, as well as to find ways to improve their technical and operational characteristics. For this an analysis of relevant literature and scientific research in the field of radiation-protective materials and, in particular, barite-containing concrete was carried out. The advantages of barite-containing concrete are high radiation-protective properties, environmental friendliness, high density, as well as economic indicators. The disadvantages are high susceptibility to shrinkage deformation and poor resistance to cyclic temperature effects. The addition of barite to the concrete composition allows to increase the coefficient of linear absorption of -rays of the material; also, with the proper selection of the composition, such material may have strength characteristics equal to or superior to the characteristics of concrete with standard compositions. Barite-containing materials have a wide range of applications and can be used both for the production of heavy concrete in the construction of load-bearing structures and in the creation of radiation-protective coatings for walls and floors.

scholarly journals Studi Mikrostruktur Mortar Geopolimer Abu Sawit dengan Variasi Rasio Na2SiO3 terhadap NaOH

2019 ◽  
Vol 19 (1) ◽  
pp. 132
Author(s):  
Wari Dony ◽  
Amsori M Das
Keyword(s):  
Compressive Strength ◽  
Oil Palm ◽  
Building Materials ◽  
Construction Material ◽  
Geopolymer Concrete ◽  
Alkali Activator ◽  
Industry Waste ◽  
Result Show ◽  
Naoh Solution ◽  
Oil Palm Ash

In the context development of building materials geopolymer concrete is an environmentally technology. The goal of the study identifies and examines geopolymer concrete becoming  alternative to portland cement (PC) as a construction material section is utilized as one of the local plantation industry waste such as oil palm ash. Polymerzation process performed the oil palm ash as precursor that contains high silicate calcium with Na2SiO3 and NaOH as alkali activator. Mix design is carried out by ratio of alkali activator 2,0. 1,5 and  1,0  at a concentration of NaOH 8, 10, 12, 14 and 16 M at temperature 90°C for 24 hours. The method used is the separate mixtures with extra water and mixed methods directly without extra water. The result show that the higher concentration of NaOH solution, the compressive strength is increased at level of 12,4 Mpa=8,4 M for the mortar with extra water and 20,2 Mpa= 16 M without extra water at ratio of 1,5 alkaline activators. The ratio mixture of alkali activator 1,0and 2,0 would produce a low compressive strength. Microstructure result shows that matrix is formed more solid at each increase in the concentration of Na OH solution. The ratio of Alkali activator 1,5 causing precursors and alkaline activators to react homogeneously so that the formed geopolymer matrix becomes more solid

A Study on the Effect of Oxide Compositions on the Compressive Strength Characteristics of Geopolymer Concrete

2016 ◽  
Author(s):  
M. Srinivasula Reddy ◽  
P. Dinakar ◽  
B. Hanumantha Rao ◽  
B. K. Satpathy ◽  
A. N. Mohanty
Keyword(s):  
Compressive Strength ◽  
Strength Characteristics ◽  
Geopolymer Concrete

scholarly journals Dürtme Bireysel Tasarrufları Etkileyebilir mi?

2020 ◽  
Vol 2 (2) ◽  
pp. 146-160
Author(s):  
Meltem Erdoğan ◽  
Veysel Karagöl
Keyword(s):  
Public Policy ◽  
Behavioral Economics ◽  
Cost Effective ◽  
Point Of View ◽  
Financial Decisions ◽  
Policy Tool ◽  
Irrational Behavior ◽  
The Government ◽  
The Individual ◽  
The Impact

The policies created by targeting individuals whose decisions are considered to have unlimited rationality are insufficient to solve the problems that have arisen today and in the past. However, being able to influence behavior is very important for public policy, also understanding the impact of people's behavior on the needs of the government and policy choices have recently been made aware of these effects. Individuals exhibiting irrational behavior cause behavioral economics to go a little further every day. The nudging, one of the applications of behavioral economics, aims to prevent irrational behaviors in simple and cost-effective ways and thus to guide individuals to good and right. So much so that the nudge is rapidly becoming an alternative public policy tool in many areas. With nudging, designing and implementing evidence-based, tested policies rather than traditional policy-making processes increases the chances of success of policies. From this point of view, it is only one of these areas to increase individual savings by guiding (nudging) the financial decisions of individuals. Is it really possible to increase individual savings by nudging? The aim of this study is to provide suggestions on whether the individual savings can be increased by nudging in view of how the nudging mechanism works and considering the empirical findings of nudging financial decisions.

INFLUENCE OF CURING CONDITIONS AND ALKALI HYDROXIDE ON STRENGTH OF FLY ASH GEOPOLYMER CONCRETE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Khoa Tan Nguyen ◽  
Tuan Anh Le ◽  
An Thao Huynh ◽  
Namshik Ahn
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Carbon Dioxide Emissions ◽  
Building Materials ◽  
Sodium Hydroxide Solution ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Curing Time ◽  
Curing Conditions ◽  
Alkali Hydroxide

Geopolymer concrete is known as an alternative to Portland cement, with low carbon dioxide emissions compared with the conventional building materials. In this research, the influence of curing conditions and alkali hydroxide were investigated, using curing temperatures between 40 to 100℃, curing times from 4 to 12 hours, and various types of hydroxide and concentrations of sodium hydroxide solution. Geopolymerization needs energy and time to occur, and higher curing temperatures resulted in larger compressive strength, while longer curing times resulted in higher compressive strength. At the same curing temperature, longer curing time resulted in a higher compressive strength because the longer curing time extends the chemical reaction. For geopolymer concrete, sodium hydroxide is a better property than potassium hydroxide, because the atomic size of sodium anion is smaller than potassium. Further, the strength of concrete increased when the concentration of sodium hydroxide increased. In conclusion, geopolymer concrete is suitable for traditional building materials. Finding renewable materials to satisfy the increasing demand for building structures will be the primary challenge in future.

scholarly journals The Influence of Composition and Recipe Dosage on the Strength Characteristics of New Geopolymer Concrete with the Use of Stone Flour

2022 ◽  
Vol 12 (2) ◽  
pp. 613
Author(s):  
Alexey N. Beskopylny ◽  
Evgenii M. Shcherban’ ◽  
Sergey A. Stel’makh ◽  
Levon R. Mailyan ◽  
Besarion Meskhi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Setting Time ◽  
Microstructural Analysis ◽  
Component Composition ◽  
Potassium Feldspar ◽  
Geopolymer Concrete ◽  
Global Trends ◽  
Fine Grained ◽  
Strength In Bending

Currently, considering global trends and challenges, as well as the UN sustainable development goals and the ESG plan, the development of geopolymer binders for the production of geopolymer concrete has become an urgent area of construction science. This study aimed to reveal the influence of the component composition and recipe dosage on the characteristics of fine-grained geopolymer concrete with the use of stone flour. Eleven compositions of geopolymer fine-grained concrete were made from which samples of the mixture were obtained for testing at the beginning and end of setting and models in the form of beams and cubes for testing the compressive strength tensile strength in bending. It was found that the considered types of stone flour can be successfully used as an additive in the manufacture of geopolymer concrete. An analysis of the setting time measurements showed that stone flour could accelerate the hardening of the geopolymer composite. It was found that the addition of stone waste significantly improves the compressive strength of geopolymers in comparison with a geopolymer composite containing only quartz sand. The maximum compressive strength of 52.2 MPa and the tensile strength in bending of 6.7 MPa provide the introduction of potassium feldspar in an amount of 15% of the binder mass. Microstructural analysis of the geopolymer composite was carried out, confirming the effectiveness of the recipe techniques implemented in this study.

scholarly journals Visual Landscape Quality as Viewed from Motorways in Spain

2018 ◽  
Vol 10 (8) ◽  
pp. 2592 ◽  
Author(s):  
Belén Martín ◽  
Rosa Arce ◽  
Isabel Otero ◽  
Manuel Loro
Keyword(s):  
Building Materials ◽  
Point Of View ◽  
The Public ◽  
The Road ◽  
Road Users ◽  
Landscape Quality ◽  
The Aesthetic ◽  
The Individual ◽  
Aesthetic Characteristics

Motorways are large infrastructures that alter the environmental resources in a territory, while constituting an important element through which the individual comes into contact with the landscape. Motorways are integrated in the landscape through their layout design and construction, the aesthetic details of minor structures (design and building materials) and the treatment of embankments and landscape planting. In this paper, we test the following hypotheses: motorway elements are related to the perception of landscape quality—from the point of view of the road users—and the aesthetic characteristics of minor infrastructures and planting affect the quality of the landscape perceived from the roads. These research questions were tested by comparing the visual quality of the landscapes captured in 128 photographs taken from sections of motorways in Spain. We compared the results obtained from (a) a photo-based method, and (b) the public’s landscape preferences determined using a survey of 737 people. The results show a correlation between the landscape quality values obtained using the model and the landscape preferences expressed by the public. We also found that the presence of the motorway elements and their aesthetic characteristics are significant in the users’ perception. These results can be applied in the decision-making process for potential investments to integrate new and existing motorways in the landscape.

scholarly journals Chemical and mechanical properties of geopolymer concrete incorporated with cigarette filters

2021 ◽  
Vol 899 (1) ◽  
pp. 012043
Author(s):  
Marianne Saba ◽  
Karolos J Kontoleon ◽  
Efthimios Zervas ◽  
Makram El Bachawati
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Mechanical Strength ◽  
Building Materials ◽  
Electronic Cigarettes ◽  
Environmental Problems ◽  
Sustainable Construction ◽  
Geopolymer Concrete ◽  
The World ◽  
First Time

Abstract Smoking epidemics have increased the number of smokers around the globe. Moreover, the world urbanization steadily increases. As a result, environmental problems are exacerbated by the proliferation of combustible and electronic cigarettes and the cement invasion of permeable spaces. Therefore, sustainable construction/building materials that use recycled ingredients like cigarette filters are worth considering. This paper assesses and compares, for the first time in the literature, the chemical and mechanical properties of geopolymer concrete substituted by 0, 10, 15, and 20% by weight of cigarette filters. Results have shown that the higher the amount of cigarette filters, the lower the mechanical strength. However, the results also indicate that the geopolymerization reaction is still in progress as the compressive strength of all aged samples is still increasing.

scholarly journals Utilization of Abandoned Mine Soil in Making Bricks to Be Used for Construction Activity

2021 ◽  
Vol 9 (9) ◽  
pp. 1-8
Author(s):  
Shwetha S
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Building Materials ◽  
Clay Soil ◽  
Mine Waste ◽  
Construction Materials ◽  
Cost Effective ◽  
Mine Soil ◽  
Extraction Technology ◽  
Concrete Blocks

Abstract: Mining is a process of extraction of valuable minerals or geological substances from the earth; however, mining degrades the ecosystem. Earlier studies have discovered that about 10-15% of the ore mined is not utilized and discarded due to lack of cost-effective extraction technology for low graded ore in India. These soils cause environmental degradation as they do not support the growth of vegetation. Thus, the land becomes abandoned and fits for nothing. These soils have created an unsolved problem in mining industries. Bringing a solution to this issue is a challenging task. And it is necessary due to the presence of heavy metals in them. Concomitantly, there is a substantial demand for the construction materials. Due to increase in the population the need for shelter is increasing day by day. So, it is imperious to use these mining soils in building materials such as bricks, concrete blocks and other products which are of high value in day-to-day life. In the present study we attempt to prepare non modular bricks by using iron tailings or soils and clay soil. Here in this study we prepared different bricks varying their composition with respect to percentage of mine waste viz... 0,20,40,60,80, 100.The bricks made up 20%, 40%, 60% of mine soil replaced with the regular clay soil, attained compressive strength of 10.07MPa, 7.11MPa, 3.95MPa respectively with a water absorption of 14.57%, 15.61%, 18.44% respectively. So, mined soil which is unfertile and useless otherwise can answer sustainability by going for Brick making. Keywords: Mine soil, Bricks, compressive strength, water absorption

Differences in the Properties of Arenaceous Marlstones from Different Quarries

2014 ◽  
Vol 982 ◽  
pp. 149-153
Author(s):  
Eva Vejmelková ◽  
Monika Čáchová ◽  
Dana Koňáková ◽  
Martin Keppert ◽  
Pavel Reiterman ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Open Porosity ◽  
Sedimentary Rock ◽  
Building Materials ◽  
Point Of View ◽  
Historical Buildings ◽  
Similar Material ◽  
The Czech Republic ◽  
Hygric Properties

In this article two arenaceous marlstones quarried in Czech Republic were compared. Thanks to its easy workability and many deposits, arenaceous marlstone belonged to the main building materials in Roman and Gothic style. In the Czech Republic many interesting historical buildings from this period still exist, and they need to be sometimes repaired. It is important to use similar material for conservation of historical values of these monuments. From the geological point of view arenaceous marlstone is sedimentary rock containing loamy and silty particles. But as it was proved in this study two functioning quarries in the Czech Republic supply two materials with extremely different properties. Open porosity varies by about 33%, compressive strength by about 65% and also thermal and hygric properties are almost incomparable.

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