scholarly journals Microstructural and engineering properties investigation of sustainable hybrid concrete produced from industrial wastes

2021 ◽  
Vol 2 ◽  
pp. 100052
Author(s):  
Gaurav Chand ◽  
Shobha Ram ◽  
Sunil Kumar ◽  
Udita Gupta
Keyword(s):  
Industrial Wastes ◽  
Engineering Properties

scholarly journals Reliability of Unconventional Concrete: Improvement in Mix Design and Addition of Bacterial Admixture

2021 ◽  
Vol 9 (11) ◽  
pp. 136-149
Author(s):  
Burhan Afzal
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Bacillus Subtilis ◽  
Silica Fume ◽  
Carbon Dioxide Emissions ◽  
Substantial Reduction ◽  
Bacillus Sphaericus ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Environmental Damage

Abstract: Portland cement is used by the construction industries, which is known to be a heavy contributor of carbon dioxide emissions and environmental damage. Adding of industrial wastes like demolished old concrete OF structures, silica fume (SF) fly ash (FA) as additional cementing materials (SCMs) could result in a substantial reduction of the overall Carbon dioxide trace marks of the final concrete product. Use of these additional materials in construction industry especially in the making of concrete is highly challenging. Remarkable research efforts are needed to study about the engineering properties of concrete incorporating such industrial wastes. Present research is an effort to study the properties of concrete adding industrial wastes such as demolished concrete, FA and SF The improvement of properties of RCA concrete with the incorporation of two ureolytic-type bacteria, Bacillus subtilis and Bacillus sphaericus to improve the properties of RCA concrete. The experimental investigations are carried out by experts evaluate the improvement of the compressive strength, capillary water absorption and drying shrinkage of RCA concrete adding bacteria. Seven concrete mixes are manufactured using Portland slag cement (PSC) partially changed with SF ranging from 0 to 30%. The mix proportions were obtained as per Indian standard IS: 10262-2009 with 10% extra cement when SF is taken as per the above the construction practice by experts. Optimal dosages of SF for maximum values of compressive strength, tensile splitting strength and flexural strength at 28 days are determined. Keywords: Bacillus subtilis, Bacillus sphaericus, RCA, PSC, Silica Fume.

scholarly journals Selection of Novel Geopolymeric Mortars for Sustainable Construction Applications Using Fuzzy Topsis Approach

2020 ◽  
Vol 12 (15) ◽  
pp. 5987 ◽  
Author(s):  
Manfredi Saeli ◽  
Rosa Micale ◽  
Maria Paula Seabra ◽  
João A. Labrincha ◽  
Giada La Scalia
Keyword(s):  
Fly Ash ◽  
Construction Materials ◽  
Fuzzy Topsis ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Structural Element ◽  
Structural Applications ◽  
Multi Criteria Analysis ◽  
Biomass Fly Ash ◽  
Topsis Approach

Construction is recognized as one of the most polluting and energy consuming industries worldwide, especially in developing countries. Therefore, Research and Development (R&D) of novel manufacturing technologies and green construction materials is becoming extremely compelling. This study aims at evaluating the reuse of various wastes, originated in the Kraft pulp-paper industry, as raw materials in the manufacture of novel geopolymeric (GP) mortars whose properties fundamentally depend on the target application (e.g., insulating panel, partition wall, structural element, furnishing, etc.). Five different wastes were reused as filler: Two typologies of Biomass Fly Ash, calcareous sludge, grits, and dregs. The produced samples were characterized and a multi criteria analysis, able to take into account not only the engineering properties, but also the environmental and economic aspects, has been implemented. The criteria weights were evaluated using the Delphi methodology. The fuzzy Topsis approach has been used to consider the intrinsic uncertainty related to unconventional materials, as the produced GP-mortars. The computational analysis showed that adding the considered industrial wastes as filler is strongly recommended to improve the performance of materials intended for structural applications in construction. The results revealed that the formulations containing 5 wt.% of calcareous sludge, grits, and dregs and the one containing 7.5 wt.% of calcareous sludge, grits, dregs, and Biomass Fly Ash-1 have emerged as the best alternatives. Furthermore, it resulted that the Biomass Fly Ash-2 negatively influences the structural performance and relative rank of the material. Finally, this case study clearly shows that the fuzzy Topsis multi-criteria analysis represents a valuable and easy tool to investigate construction materials (either traditional and unconventional) when an intrinsic uncertainty is related to the measurement of the quantitative and qualitative characteristics.

Development of Geopolymer Mortar from Metakaolin Blended with Agricultural and Industrial Wastes

2018 ◽  
Vol 766 ◽  
pp. 305-310 ◽  
Author(s):  
Chayanee Tippayasam ◽  
Sarochapat Sutikulsombat ◽  
Jamjuree Paramee ◽  
Cristina Leonelli ◽  
Duangrudee Chaysuwan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Chemical Properties ◽  
Cement Industry ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Alkali Solutions ◽  
Physical And Chemical

Geopolymer is a greener alternative cement produced from the reaction of pozzolans and strong alkali solutions. Generally, the cement industry is one of largest producers of CO2that caused global warming. For geopolymer mortar usage, Portland cement is not utilized at all. In this research, geopolymer mortars were prepared by mixing metakaolin, various wastes (fly ash, bagasse ash and rice husk ash) varied as 80:20, 50:50 and 20:80, 15M NaOH, Na2SiO3and sand. The influence of various parameters such as metakaolin to ashes ratios and pozzolans to alkali ratios on engineering properties of metakaolin blended wastes geopolymer mortar were studied. Compressive strength tests were carried out on 25 x 25 x 25 mm3cube geopolymer mortar specimens at 7, 14, 21, 28 and 91 air curing days. Physical and chemical properties were also investigated at the same times. The test results revealed that the highest compressive strength was 20% metakaolin - 80% fly ash geopolymer mortar. When the curing times increases, the compressive strength of geopolymer mortar also increases. The mixing of metakaolin and bagasse ash/rice husk ash presented lower compressive strength but higher water absorption and porosity. For FTIR results, Si-O, Al-O and Si-O-Na+were found. Moreover, the geopolymer mortar could easily plastered on the wall.

Effects of Steel Slag on the Strength Properties of Clay, Lateritic and Black Cotton Clay Soil

2016 ◽  
Vol 8 (02) ◽  
pp. 121-126
Author(s):  
Kalpana Patel ◽  
Adarsh Patel
Keyword(s):  
Industrial Waste ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Steel Slag ◽  
Strength Properties ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Large Space ◽  
Effective Utilization ◽  
Construction Engineering

Excessive use of materials, leads to industrialization, which has an adverse impact on the environment. From industries, large amount of chemicals or other suspended particles as a waste are produced, which are mostly dumped that acquires large space leading to deterioration of soil properties. So, we should use these waste for some constructive or useful purposes. As steel industry releases waste with some good engineering properties so, we can use this type of waste with soil which has low strength and does not have good engineering properties. Various techniques are available like soil stabilization, providing reinforcement etc. to improve load bearing capacity of soil. Soil stabilization is one of the modification techniques used to improve the geotechnical properties of soil and has become the major practice in construction engineering which enables the effective utilization of industrial wastes as a stabilizer. This technique becomes more popular because of its easy availability and adaptability. In this study, the steel slag (an industrial waste) is mixed with Clay(CI), Lateritic(A-7-6(5)) , Black cotton clay soil to enhance its strength properties and make them more suitable for use. In this way industrial waste can be reduced economically.

scholarly journals Effect of Industrial Waste and Geopolymers on Stabilisation of Expansive Clay

2019 ◽  
Vol 9 (2) ◽  
pp. 5575-5577
Keyword(s):  
Shear Strength ◽  
Sodium Hydroxide ◽  
Clay Soil ◽  
Research Work ◽  
Expansive Soil ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Low Permeability ◽  
Expansive Clay ◽  
Strength Determination

Expansive clay soils are geotechnically problematic in nature as they possess less shear strength, high compressibility and low permeability. This research work was carried out with a view to improve index and engineering properties of expansive soil by stabilizing it with industrial wastes and geopolymers. The industrial wastes such as fly ash, silica fume and sodium-hydroxide were used for the stabilization of expansive soil. the virgin clay soil was tested for its index properties, compaction characteristics and shear strength determination. the stabilization of clay is made by adding and mixing those materials by varying its percentage. In the stabilization of soil with sodium hydroxide, an attempt has been made to study the effect of its molarity on the various properties of the soil. The clay soil stabilized with various materials was also tested for the same properties and that results were compared with that of virgin soil to find the effect of stabilization.

Value Added Product of Lightweight Cement from Industrial By-Products Using Geopolymer Technique

2018 ◽  
Vol 934 ◽  
pp. 200-205
Author(s):  
Teewara Suwan ◽  
Boontarika Paphawasit ◽  
Xiang Ming Zhou ◽  
Pitiwat Wattanachai
Keyword(s):  
Portland Cement ◽  
Construction Material ◽  
Value Added ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Efficient Production ◽  
Cement Production ◽  
Main Challenge ◽  
By Products ◽  
Main Material

In construction and building material sector, Lightweight Cement (LWC) has been receiving much more attention due to some of its advantages compared to other lightweight materials e.g. wood, foam and plastic. The method of incorporating tiny air bubbles into cementitious matrix for lightweight cement production is widely used as it could achieve good engineering properties with efficient production process. Conventional methods, Autoclaved Aerated Cement (AAC) and Portland cement-Cellular Lightweight Cement (CLC), use Portland cement as a main material which could lead to a huge disturbance to natural sources as well as release massive amount of carbon dioxide (CO2) to the atmosphere during its calcination. To achieve green construction material scheme, an attempt to utilize industrial wastes (by-products) as raw starting materials have been developing. One among those value-added approaches is OPC-less alkaline-activated cement from by-products, called Geopolymer technique. The main aim of this paper is to develop lightweight cement by using geopolymer technique with (CLC) method, called GP-CLC system, in order to optimize both economical aspects and engineering properties. The preliminary results show that the compressive strength of GP-CLC cannot reach that level of AAC system, but the strength was higher than the conventional OPC-CLC. The main challenge is that unit CO2 emission can be significantly reduce by using GP-CLC system as OPC consumption is replaced by by-product, fly ash.

scholarly journals Application of self-produced artificial sand in the production of green mortar

2021 ◽  
Vol 72 (4) ◽  
pp. 468-476
Author(s):  
Phuoc Huynh Trong ◽  
Khang Lam Tri ◽  
Binh Pham Trong ◽  
Phuong Phan Huy
Keyword(s):  
Natural Resources ◽  
Negative Impact ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Negative Effects ◽  
Natural Sand ◽  
Design Algorithm ◽  
Artificial Materials ◽  
Naoh Solution ◽  
By Products

Due to the large disposal of locally industrial wastes and the shortage of natural resources, turning industrial by-products into green artificial materials has been attracting many researchers in the world. Following this trend, this study evaluated the potential application of self-produced artificial sand (AS) in the production of green mortar. The AS was produced by the alkali-activated method using a mixture of 36.4% fly ash, 36.4% slag, 3.5% 10M NaOH solution, 11% Na2SiO3 solution, and 12.7% water. The mortar mixtures were designed based on the densified mixture design algorithm with the incorporation of the AS as the substitution of natural sand (NS) by 0 – 100 wt.% (interval of 20%). The engineering properties of the mortar samples in both fresh and hardened states were evaluated through the tests of workability, compressive strength (CS), water absorption (WA), and shrinkage/ expansion. The experimental results showed that the mortar sample incorporating 20% of AS to replace NS performed superior engineering properties in comparison to other samples. Further increasing the AS content generally caused a negative impact on the mortar’s performance. Increasing AS content beyond 20% systematically decreased the CS while both WA and expansion were increased noticeably. However, the properties of the green mortar produced for this study satisfied all of the requirements of the official Vietnamese standards. Thus, the research results further confirmed a great potential in producing green mortar using AS to either partially or fully replacement of NS. In addition, the use of AS greatly contributes to not only saving natural resources but also limiting the negative effects on the environment due to the exploitation and use of naturally sourced materials.

scholarly journals Geopolymers as Alternative Sustainable Binders for Stabilisation of Clays—A Review

Geotechnics ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 439-459
Author(s):  
Jeremiah J. Jeremiah ◽  
Samuel J. Abbey ◽  
Colin A. Booth ◽  
Anil Kashyap
Keyword(s):  
Industrial Wastes ◽  
Engineering Properties ◽  
Alkali Activation ◽  
Palm Oil Fuel Ash ◽  
Practical Applications ◽  
Road Pavement ◽  
Fuel Ash ◽  
Marble Powder ◽  
Pavement Construction ◽  
Oil Fuel

The need to transit to greener options in soil stabilisation has revamped research on the use of industrial and agricultural by-products in order to cut down on the current carbon footprint from the use of ordinary Portland cement (OPC) and lime related binders for the treatment of problematic soils. This study is a review on the use of geopolymers constituted by alkali activation of several industrial wastes such as pulverised fuel ash (PFA), ground granulated blast furnace slag (GGBS), metakaolin (MK), glass powder (GP), palm oil fuel ash (POFA), silica fume (SF), rice husk ash (RHA), volcanic ash (VA), and marble powder (MP) for the stabilisation of weak clays. The performance of stabilised clays as subgrade and subbase materials for road pavement construction was evaluated by comparing the 7 day UCS of the treated clays with the strength requirement for stabilised materials as outlined in BS EN 16907-4. The result of the study shows that geopolymers can be employed in improving the engineering properties of problematic clays to meet practical applications. Strength improvement was observed in the stabilised clays with increased precursor content, molarity of alkaline activator, and curing period.

scholarly journals Experimental Studies on Drying-Wetting Cycle Characteristics of Expansive Soils Improved by Industrial Wastes

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Hao Ye ◽  
Chengfu Chu ◽  
Long Xu ◽  
Kunlong Guo ◽  
Dong Li
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Experimental Studies ◽  
Stable State ◽  
Calcium Carbide ◽  
Industrial Wastes ◽  
Atterberg Limits ◽  
Engineering Properties ◽  
Carbide Slag ◽  
Wetting Process

The improved engineering properties of the expansive soil by mixing with various additives will be changed during the long-term variation of the meteorological and hydrological conditions. In the present work, a series of tests are performed to investigate the evolution of the unconfined compression strength and the Atterberg limits under drying-wetting cycling conditions for specimens treated by iron tailing sands and calcium carbide slag. Typical results of the unconfined compressive strength can be divided into three stages. The unconfined compressive strength increases initially and then decreases to reach a stable state with continuous drying-wetting process. The calcium carbide slag content (αCCS) of 10% can be determined for the minimum effect of the drying-wetting cycle on the strength of the treated specimen. An exponential relationship is established to describe the evolution of the unconfined compressive strength with the drying-wetting cycle. The liquid limit and plastic index of the specimen increase initially followed by a decreasing trend, while a reverse trend was observed for that of the plastic limit during the drying-wetting process. The minimum effect of the drying-wetting cycle on the Atterberg limits can be presented for the specimen with αCCS of 10% as well.

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