scholarly journals Durability Evaluation of Calcined Clay and Limestone Powder Blended Ternary Self-Compacting Concrete

2021 ◽  
Vol 8 (1) ◽  
pp. C1-C10
Author(s):  
J.K. Taku ◽  
Y.D. Amartey ◽  
S.P. Ejeh ◽  
A. Lawan
Keyword(s):  
Research Work ◽  
Strength Properties ◽  
Limestone Powder ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Calcined Clay ◽  
Ft Ir ◽  
Short And Long Term ◽  
Ft Ir Spectroscopy

This research work investigates the durability-based properties of a ternary calcined clay and limestone powder blended Self Compacting Concrete by measuring the short- and long-term permeation properties using water absorption and sorptivity properties testing. Also, the variation of compressive strength with age was evaluated at 7, 14, 28 and 56 days, while the split tensile strength was determined at 7 and 28 days curing. The Mineralogy and morphology of the ternary SCC was evaluated using FT IR Spectroscopy, SEM imaging and EDS. The results obtained shows that the ternary SCC showed improved durability and strength properties with age with dense and improved microstructure.

scholarly journals The Effect of Calcium Carbonate Filler on Self-Compacting Concrete Using Different Aggregate Sizes

2019 ◽  
Vol 4 (9) ◽  
pp. 9-16
Author(s):  
Wasiu John ◽  
Agbawhe Okeoghene Oghenekume ◽  
Tuleun Lawrence Zahemen
Keyword(s):  
Calcium Carbonate ◽  
Coarse Aggregate ◽  
Rice Husk Ash ◽  
Research Work ◽  
Strength Properties ◽  
Limestone Powder ◽  
Experimental Investigations ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Carbonate Filler

In this research work, the effect of Calcium Carbonate Filler was studied on the compressive strength and the workability of self-compacting Concrete (SCC) at different grades (M60, M65 and M70) and different coarse aggregate sizes (6.3mm, 10mm and 20mm). Calcium Carbonate Filler (Limestone powder) and Rice Husk Ash (RHA) were added in percentages of 2.5% and 5% to check its effect on the workability and strength properties of SCC and Normally Vibrated Concrete. Experimental investigations were carried out on SCC and normally vibrated concrete (NVC) samples of grade M60, M65 and M70 using different aggregate sizes of 6.3mm, 10mm and 20mm. The workability test results obtained showed values within specification.  The compressive and Tensile strengths for SCC (with powder and 2.5% RHA) are higher than that with powder and 5% RHA and NVC. Generally, the use of Calcium Carbonate Filler improved the strength and densities for SCC design mix and decreased its workability. It is concluded that the use of SCC with designed Fillers ratio and RHA (≤5%) will improve the strength properties of SCC.

scholarly journals Wool Fabric Treated With Eco – Friendly Insect Repellent

2017 ◽  
Vol 25 (0) ◽  
pp. 102-105
Author(s):  
Silva Kreševič Vraz ◽  
Bojana Vončina
Keyword(s):  
Ir Spectroscopy ◽  
Research Work ◽  
Curing Temperature ◽  
Wool Fabric ◽  
Insect Repellent ◽  
Textile Materials ◽  
Separate Treatment ◽  
Ft Ir ◽  
Time Periods ◽  
Ft Ir Spectroscopy

In the research work presented, fabric made of wool was grafted with β-cyclodextrine (β-CD) using 1, 2, 3, 4 butanetetracarboxlic acid (BTCA) as a polyfunctional reagent. To reduce the grafting curing temperature, which could damage the wool fabric if too high, cyanamide (CA) in combination with ammonium dihydrogen phosphat (ADHP) were used as catalysts. The presence of cedar oil applied onto textile materials was determined by ATR FT-IR spectroscopy, as well as estimation of the add-on of cedar oil with the gravimetric approach, respectively. Finally the reduction in moths after being exposed to wool treated with a separate treatment formulation i.e. β-CD, cedar oil, and β-CD in combination with cedar oil was assessed visually after different time periods. Results showed that the wool after being treated with β-CD in combination with cedar oil shows significantly prolonged moth oppression activity compared to the wool treated with cedar oil only.

scholarly journals Experimental Researchon Flow and Strength Properties of Blended Fibre Reinforced Self Compacting Concrete

2019 ◽  
Vol 8 (6S4) ◽  
pp. 151-155
Keyword(s):  
Compressive Strength ◽  
Aspect Ratio ◽  
Considerable Increase ◽  
Mechanical Vibration ◽  
Strength Properties ◽  
Single Fiber ◽  
Moderate Increase ◽  
Fiber Reinforced ◽  
Self Compacting Concrete ◽  
Split Tensile Strength

Self compacting concrete achieves compaction by itself without using mechanical vibration techniques. Addition of fibers to SCC results in increased performance mainly in flexure, and also in compressive strength. In this study both the flow and strength properties of single Fiber and blended fiber reinforced self compacting concrete are examined in comparison with control self compacting concrete. crimpled steel fibers having size of 0.45mm diameter x 12.5mm length (aspect ratio 27.7) and 0.45mm diameter x 20 mm length (aspect ratio 44.44) are used in the SCC mix at various percentages by weight of cement i.e. 0%, 2%, 4% and 6%. From the obtained results it can be seen that there is aadverse affect on flow properties. There is a moderate increase in the compressive strength, split tensile strength and considerable increase in the flexural strength of the self compacting concrete using the blended fibers at different percentages i.e. at 2% and 4%, when compared to the single fiber reinforced self compacting concrete.

scholarly journals Enhancing the Strength Properties of Self-Compacting Concrete with Fiber Reinforcement

2019 ◽  
Vol 6 (5) ◽  
pp. 5-8
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Strength Properties ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Filling Ability ◽  
Hardened Properties ◽  
Passing Ability ◽  
New Generation

Self-compacting concrete is one that is flow able by its own. The SCC is suitable for placing in dense reinforcement structures. It is a new generation performance concrete known for its outstanding deformity and high resistance to bleeding. The concrete is frail material which is comparatively tough in compression but fragile in tension. The tensile strength of concrete is improved by addition of fibers in the concrete mix. The addition of such fibers has negative consequence on the workability of concrete. Various types of fibers are used in concrete to provide the higher flexural strength and better tensile strength. In this research steel fibers are used to provide a better strength as compared with normal reinforced concrete. Steel fiber in SCC significantly improves its flexural strength, improved tensile properties, reduce cracking and improve durability. In this research the investigation of steel fiber in SCC to enhance the strength properties of SCC. The objective of the study was to determine different properties of SCC with steel fiber at different proportions. The experimental investigation was took on the freshly mixed and hardened properties of SCC of various mix with the different variations of fiber 0.25%, 0.50%, 0.75% and 1% by using Viscosity Modified Agent (VMA) 1.5% of cement material by using M25 grade of concrete. In this research a series of tests were carried out for workability like slump cone test, U funnel, V funnel, L box test on SCC to check freshly mix properties like flow-ability, filling-ability, and passing-ability and hardened properties like compressive strength, split-tensile strength and flexural strength respectively and test were conducted at the age of 7Days, 14Days, 28Days on the SCC. The advantage of adding steel fiber in self-compacting concrete is that it enhances its overall strength.

scholarly journals Results obtained by investigating saffron ussing FT-IR spectroscopy

2016 ◽  
Vol 73 (2) ◽  
pp. 238
Author(s):  
Luisa Andronie ◽  
Aurelia Coroian ◽  
Vioara Miresan ◽  
Ioana Pop ◽  
Camelia Raducu ◽  
...  
Keyword(s):  
Biological Activity ◽  
Ir Spectroscopy ◽  
Ir Spectra ◽  
Ir Spectrum ◽  
Research Work ◽  
Ft Ir ◽  
Pharmaceutical Properties ◽  
Ft Ir Spectroscopy

The biological activity and the pharmaceutical properties of plants are strongly dependent on their structure.The FT-IR spectra of saffron (commercial) have been obtained. The vibrational fundamentals from the IR spectrum, were analyzed  and assigned acoording to the available literature. In the present research work the genus saffron is selected because it is famous in wold as foods and also as medicine.

scholarly journals Impact of Design Parameters on the Ratio of Compressive to Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3480
Author(s):  
Rebeca Martínez-García ◽  
P. Jagadesh ◽  
Gabriel Búrdalo-Salcedo ◽  
Covadonga Palencia ◽  
María Fernández-Raga ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Strength Properties ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Design Parameters ◽  
Fine Aggregate ◽  
Strength Ratio ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
The Impact

Most concrete studies are concentrated on mechanical properties especially strength properties either directly or indirectly (fresh and durability properties). Hence, the ratio of split tensile strength to compressive strength plays a vital role in defining the concrete properties. In this review, the impact of design parameters on the strength ratio of various grades of Self-Compacting Concrete (SCC) with recycled aggregate is assessed. The design parameters considered for the study are Water to Cement (W/C) ratio, Water to Binder (W/B) ratio, Total Aggregates to Cement (TA/C) ratio, Fine Aggregate to Coarse Aggregate (FA/CA) ratio, Water to Solid (W/S) ratio in percentage, superplasticizer (SP) content (kg/cu.m), replacement percentage of recycled coarse aggregates (RCA), replacement percentage of recycled fine aggregates (RFA), fresh density and loading area of the specimen. It is observed that the strength ratio of SCC with recycled aggregates is affected by design parameters.

scholarly journals Investigation on Durability Properties of Self Compacting Concrete with Mineral Admixtures

2020 ◽  
Vol 9 (4) ◽  
pp. 388-396
Keyword(s):  
Salt Water ◽  
Research Work ◽  
Resistance Test ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Experimental Investigations ◽  
Filler Materials ◽  
Self Compacting Concrete ◽  
Durability Properties ◽  
Strength And Durability

Self-Compacting Concrete (SCC) or Self Consolidating Concrete is the present-day concrete that is being adopted the world over. The production of SCC involves the selection of appropriate materials and good quality control which is essential for the durability of concrete. The mineral admixtures and filler materials provide additional reduction to the porosity of the concrete. The primary objective of the present research work is to carry out the experimental investigations on durability properties of SCC with 20 different mix proportions, containing various percentages of filler materials like Limestone Powder (LP) and Marble Powder (MP), along with the mineral admixtures like Fly ash (F) and Silica Fume (SF). Experimental investigation on the durability properties for all the 20 mixes of SCC was carried out by conducting the Rapid Chloride Penetration Test (RCPT), Saturated Water Absorption Test, Acid Resistance Test, Sulphate Resistance Test, Water Permeability Test and Salt Water Resistance Test. From the experimental study, it is observed that the SCC mix with equal proportions F (10%), SF (10%), LP (10%) and MP (10%), exhibit better performance than the control mix in terms of strength and durability characteristics and thus it is concluded that the addition of mineral admixtures and filler materials have a pivotal role in the development of strength and durability aspects of SCC.

scholarly journals Durability Phenomena of Bitumen and Bituminous Pavement Materials

2021 ◽  
Vol 15 (1) ◽  
pp. 279-289
Author(s):  
Abdullahi Ali Mohamed ◽  
Soon Yee Wong ◽  
Lau Teck Leong ◽  
Mohd Ahmadullah Farooqi ◽  
Ramadhansyah Putra Jaya ◽  
...  
Keyword(s):  
Research Work ◽  
Asphalt Mixture ◽  
Environmental Parameters ◽  
Asphalt Mixtures ◽  
Filler Materials ◽  
Traffic Loading ◽  
Pavement Materials ◽  
Course Of Action ◽  
Short And Long Term

The durability of asphaltic mixtures, in addition to traffic loading, is greatly influenced by the extremes environmental parameters. For instance, at higher temperatures, bitumen becomes soft, thereby reducing the stiffness of asphalt mixtures and making them vulnerable to rutting. On the other hand, at lower temperatures, the stiffness of bitumen is increased, reducing the flexibility of asphaltic concrete and rendering it prone to fatigue failure. Therefore, this evaluation is an extensive research study on the durability of binder and asphalt mixture with their phenomena. Besides that, this paper intends to delve into the various testing methods and measures adopted to evaluate aging and slowing it down. It also presents a critical review of these methods and proposes a future course of action to better address aging issues. According to the evaluation, the behavior of bitumen on the basis of its source varies; when it is mixed with bitumen modifiers, aggregates, and other filler materials, its behavior becomes even more complex. Hence the understanding of the phenomenon of aging is important and the significance cannot be overemphasized. Extensive research work has been done over the last seven decades to evolve the understanding of short- and long-term aging and to improve the durability of asphaltic mixtures. Generally, the aging of bitumen under the influence of both environment and traffic is irreversible as well as inevitable. Apart from entailing hefty maintenance budgets, it remains a challenge to the researchers to slow down aging.

scholarly journals Chemometric analysis of attenuated total reflectance infrared spectra ofProteus mirabilisstrains with defined structures of LPS

2016 ◽  
Vol 22 (5) ◽  
pp. 325-335 ◽  
Author(s):  
Paulina Zarnowiec ◽  
Andrzej Mizera ◽  
Magdalena Chrapek ◽  
Mariusz Urbaniak ◽  
Wieslaw Kaca
Keyword(s):  
Ir Spectroscopy ◽  
Infrared Region ◽  
Attenuated Total Reflectance ◽  
Mid Infrared ◽  
Total Reflectance ◽  
Typing Methods ◽  
Ft Ir ◽  
Tract Infections ◽  
Ft Ir Spectroscopy

Proteus spp. strains are some of the most important pathogens associated with complicated urinary tract infections and bacteremia affecting patients with immunodeficiency and long-term urinary catheterization. For epidemiological purposes, various molecular typing methods have been developed for this pathogen. However, these methods are labor intensive and time consuming. We evaluated a new method of differentiation between strains. A collection of Proteus spp. strains was analyzed by attenuated total reflectance Fourier transform infrared (ATR FT-IR) spectroscopy in the mid-infrared region. ATR FT-IR spectroscopy used in conjunction with a diamond ATR accessory directly produced the biochemical profile of the surface chemistry of bacteria. We conclude that a combination of ATR FT-IR spectroscopy and mathematical modeling provides a fast and reliable alternative for discrimination between Proteus isolates, contributing to epidemiological research.

Prediction of tensile strength in iron-contaminated archaeological wood by FT-IR spectroscopy – a study of degradation in recent oak and Vasa oak

Holzforschung ◽  
2016 ◽  
Vol 70 (9) ◽  
pp. 855-865 ◽  
Author(s):  
Gunnar Almkvist ◽  
Shahin Norbakhsh ◽  
Ingela Bjurhager ◽  
Kurt Varmuza
Keyword(s):  
Tensile Strength ◽  
Ir Spectroscopy ◽  
Strength Properties ◽  
Chemical Degradation ◽  
Strongly Correlated ◽  
Archaeological Wood ◽  
Ft Ir ◽  
Mechanical Performances ◽  
Realistic Prediction ◽  
Ft Ir Spectroscopy

Abstract Oak from the Swedish warship Vasa and recent oak that was aged after impregnation with iron(II) chloride has been analyzed by FT-IR spectroscopy and submitted to tensile strength testing. The aim was to investigate correlations between FT-IR bands in the fingerprint region, chemical degradation, and tensile strength in iron contaminated oak. The concentration of carboxylic functions increased and the acetyl groups in the hemicellulose fraction were decreasing as a function of degradation time. These changes are accompanied by reduced tensile strength and elevated content of oxalic acid (OA) in both Vasa wood and the impregnated recent oak samples. To evaluate the possibility to predict tensile strength from spectral data, chemometric modeling by partial least-squares (PLS) regression was applied. The strategy of repeated double cross validation (rdCV) allowed a realistic prediction of tensile strength. Overall, chemical changes and mechanical performances of iron contaminated wood are strongly correlated and thus FT-IR spectroscopy is suited to predict the strength properties of the degraded wood.

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