scholarly journals Investigation on strength properties of polymer modified concrete using glycoluril

2021 ◽  
Author(s):  
SKM. Pothinathan ◽  
M. Muthukannan ◽  
N. Selvapalam ◽  
S. Christopher Gnanaraj
Keyword(s):  
Mechanical Property ◽  
Flexural Strength ◽  
Acid Resistance ◽  
Strength Properties ◽  
The Other ◽  
Polymer Content ◽  
Conventional Concrete ◽  
Concrete Mix ◽  
Polymer Modified Concrete ◽  
The Impact

AbstractIn this study, an endeavor is made to discuss mainly the mechanism, use, and application of polymer modified concrete which is increasing in general fame due to its simplicity, ease of handling, proficiency, and agreeable outcomes. This work explores the impact of adding a new polymer named glycoluril on the mechanical property through the estimation of compression, tension, and flexural strength. Physical properties such as density, sorptivity, and acid resistance were studied to establish the durability of concrete. This examination additionally ponders the impact of polymer in concrete and polymer dosage. Series of concrete mix with 0%, 1%, 2%, 3%, and 4% glycoluril by the mass of binder were prepared, cured, and tested in 7 days and 28 days. Results indicate that there is no adjustment in the workability aspect, however, the improvement of strength factor in compression, tension, and flexure is recorded when compared with the conventional concrete. The experimental results show that by increasing the proportion of glycoluril, the strength of concrete increased up to 3% in addition. In the meantime, the 3% addition provided a higher outcome than the other blend. Further expanding the polymer content marginally decreased the strength. The outcome affirms that the utilization of new polymer in concrete will increase the desired property.

A review: sustainable compressive strength properties of concrete mix with replacement by marble powder

2020 ◽  
Vol 1 (98) ◽  
pp. 11-23
Author(s):  
N. Sharma ◽  
M. Singh Thakur ◽  
P.L. Goel ◽  
P. Sihag
Keyword(s):  
Compressive Strength ◽  
Design Methodology ◽  
Strength Properties ◽  
Concrete Mixture ◽  
Fine Aggregates ◽  
Concrete Mix ◽  
Marble Powder ◽  
Compressive Strength Of Concrete ◽  
The Impact

Purpose: Over the years, various experiments have been performed to investigate the impact of marble powder within the concrete mixture. In the present study, a review has been done to check the persistence of marble dirt as the substitute for concrete constituents. Design/methodology/approach: Furthermore, the impact of marble powder as a replacement of cement and aggregates were reviewed. By reviewing previous studies, the result indicates that the use of waste marble powder in cement and aggregate was adequate to a certain range. Findings: By replacing cement with marble powder in a range between 5% to 10% by weight, it increases the compressive strength of concrete mix by 11.30% to 24.56%, compared to the nominal mix. According to the study, any further increase in the amount of marble powder in place of cement i.e, 12.5% to 20% replacement by weight, results in the reduction of compressive strength of concrete mix by 7.5% to 26.01%. Replacement of aggregates from 5% to 75% with marble powder increases the compressive strength of about 3.22% to 23.91% as compared to the nominal mix. Research limitations/implications: It was also concluded from the current study that, to obtain higher compressive strength, it is advantageous to replace fine aggregates with marble powder than the replacement of cement with the marble powder.

scholarly journals Behaviour of Polypropylene Fibre on the Mechanical Charateristics of Fibre Reinforced Concrete using Polypropylene Fibers

2020 ◽  
Vol 10 (1) ◽  
pp. 231-234
Keyword(s):  
Flexural Strength ◽  
Compression Strength ◽  
Concrete Structures ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Engineering Structures ◽  
Conventional Concrete ◽  
Different Temperatures ◽  
Physical And Chemical ◽  
The Impact

Concrete as a building material, used most extensively has revolutionized the construction industry by its properties like high strength and workability. However, the engineering structures are surrounded by the combustible materials, making them prone to the blast impact loading as well as fire. Concrete structures which are subjected to the conditions of high temperature, are susceptible to physical and chemical changes leading to their degradation. The fire can cause the damage to the structure as well as human lives. The need of the hour is to study the impact of fire on the concrete structures as it is mostly used as the construction entity in buildings and other structures. In our research paper, the use of Polypropylene fibers (PPFs) in concrete and their impact on various attributes of concrete like Compression stréngth, split tensile and flexurál strength has been studied. The impact of PPFs on concrete at different temperatures has also been analyzed. The results have shown that the compression strength got raised due to the inclusion of PPFs in the concrete by 9.08%, splitting tensile by 59.25% and flexural strength by 27.36% after 4 weeks of curing. The addition of PPFs to the concrete has also resulted in an increase in strength then the conventional concrete at temperatures of 400oC and 800oC.

scholarly journals Effect of Alccofine on the Properties of Concrete Incorporating Steel Fibers

2020 ◽  
Vol 9 (5) ◽  
pp. 44-47
Keyword(s):  
Strength Properties ◽  
Steel Fibers ◽  
Mix Design ◽  
Morphological Properties ◽  
Conventional Concrete ◽  
Concrete Mix Design ◽  
Morphological Studies ◽  
Concrete Mix ◽  
Binder Ratio ◽  
Water Binder Ratio

This paper deals with the investigation of concrete containing varying replacement percentages of Alccofine and conjointly Alccofine and different proportions of steel fibers with aspect ratio 50 to investigate mechanical and morphological properties. The replacement levels of Alccofine was chosen as 5% to 15% with 5% increment and steel fibers of 0.5% to1.5% with an increment of 0.5% by volume of concrete. Mix design was done by using British D.O.E method, fixing water binder ratio as 0.45. Results indicated that concrete replaced with Alccofine in addition of steel fibers increased the compressive and flexural strength of concrete. The maximum strength was obtained for the concrete mix containing 15% Alccofine and 1.5% circular crimped steel fibers. Morphological studies indicated the excess C-S-H gel for concrete mixes containing Alccofine as compared to conventional concrete. Hence, it can be culminated that Alccofine and addition of steel fibers increases the strength properties and crack resistant strength of concrete.

scholarly journals Strength of M25 and M60 Grade Concrete with Used Foundry Sand

2019 ◽  
Vol 9 (2) ◽  
pp. 4741-4745
Keyword(s):  
Flexural Strength ◽  
Large Volume ◽  
Strength Properties ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Foundry Sand ◽  
Waste Foundry Sand

Abstract: Used or Waste Foundry Sand can be utilized as an alternative for fine aggregate in conventional concrete. WFS or UFS can be used in large volume by partially replacing sand in construction industries. Here the strength properties of M25 and M60 grade concrete replaced by WFS by 0,10,20,30,40 and 50 percent w/w of fine aggregate is evaluated by measuring compression, split tensile and flexural strength at 7 days and 14 days.

Mechanical and Fracture Properties of R-Glass Reinforced Composites with Pyrolysed Polysiloxane Resin as a Matrix

2005 ◽  
Vol 290 ◽  
pp. 344-347
Author(s):  
Miroslav Černý ◽  
D. Bednářová ◽  
Petr Glogar ◽  
Ján Dusza ◽  
Emőke Rudnayová
Keyword(s):  
Flexural Strength ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
The Other ◽  
Reinforced Composites ◽  
Fracture Properties ◽  
The Matrix ◽  
Mechanical And Fracture Properties ◽  
The Impact ◽  
Glass Reinforced Composites

Mechanical and fracture properties of unidirectional composites reinforced with R-glass fibres and utilizing various commercially available polysiloxane resins as matrix precursors were investigated. As the matrix becomes more brittle after the pyrolysis the impact toughness and flexural strength of the composites fall. On the other hand, the shear modulus rises after the pyrolysis as the matrix becomes stiffer in shear. The appearance of fracture surfaces generated during the flexural strength at room temperature (RT) and elevated temperatures is discussed.

scholarly journals Evaluation of the impact of two types of steel fibers (SE), mono and 3D, on concrete properties, when added isolated or blended

2020 ◽  
Vol 13 (3) ◽  
pp. 464-482
Author(s):  
A. L. BAUER ◽  
H. EHRENBRING ◽  
D. SCHNEIDER ◽  
U. C. M. QUININO ◽  
B. TUTIKIAN
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Steel Fibers ◽  
Conventional Concrete ◽  
State Tests ◽  
Brittle Behavior ◽  
The Matrix ◽  
Hardened State ◽  
Axial Compressive Strength ◽  
The Impact

Abstract The brittle behavior of concrete can be compensated by the addition of reinforcements, providing benefits such as improved crack control, residual strength and increased flexural strength. It is usual to apply mono fibers to concrete, but their positioning in the matrix may not be homogeneous, consequently increasing the susceptibility to fracture planes with fewer reinforcements. This study aimed to evaluate the use and behavior of simple (mono) and space (3D) steel fibers (SE), in order to achieve a more homogeneous mixture, increase the effectiveness of fibers in restricting cracks and improve mechanical properties. The fresh-state was assessed through slump and VeBe tests, whereas the hardened-state tests comprised axial compressive strength, flexural strength and the flexural toughness factor. The volume content of simple and space fibers varied from 0 to 0.93%. Based on the results, it can be stated that space and simple fiber contents improved rheological and mechanical properties of the composite in isolated (0.29%) and hybrid (0.64%) combinations, since their overall performance exceeded the other mixtures’. However, space fibers caused considerable workability losses compared to the conventional concrete, hindering its casting and harming its hardened-state properties.

scholarly journals Effect of Waste Tyre-Rubber Aggregate on the Strength Properties of Concrete

2018 ◽  
pp. 1-9
Author(s):  
Adetoye T. Oyebisi ◽  
Cordelia O. Osasona
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Coarse Aggregate ◽  
Strength Properties ◽  
Partial Replacement ◽  
Concrete Construction ◽  
Conventional Concrete ◽  
Waste Tyre ◽  
Rubber Aggregates

This research studied strength-characteristics of concrete using waste tyre-rubber as partial replacement for coarse aggregate in concrete construction and compares the results to those of conventional concrete. The specimens were produced with percentage replacements of the coarse aggregate by 5%, 10% and 15 % of rubber aggregate. A control mix with no replacement of the coarse aggregate was produced, to make a comparative analysis. The samples consisted of concrete cubes, cylinders and beams. Various tests (such as slump, compressive strength, splitting tensile strength and flexural strength tests), were conducted. Data-collection was mainly based on the results of the tests conducted on the specimens in the laboratory. The results show that there is a reduction in the compressive strength of the concrete, due to the inclusion of rubber aggregates. Compressive strength losses of 12.69%, 17.75% and 25.33% were noticed for 5%, 10%, 15% replacement of coarse aggregate, respectively; tensile strength losses of 13.01%, 20.12%, and 24.76% were observed, respectively, when 5%, 10%, 15% of the coarse aggregate was replaced, after 28 days of curing; -0.1%, -0.15% and 0.2% decrease in flexural strength was observed for 5%, 10% and 15% replacement, respectively, after curing for 28 days. Rubberised concrete was found to have some desirable characteristics (such as lower density, enhanced ductility, and a slight increase in flexural strength in the lower compressive strength concrete categories). The overall results show that it is possible to use recycled rubber tyres in concrete construction, as a partial replacement for coarse aggregates. Nevertheless, the percentage of replacement should be limited to 10% (which ensures the strength of the concrete is kept within the required range), and the application should be restricted to particular cases where the properties related to the replacement with the rubber aggregates clearly indicate an improvement on conventional concrete, and so are desirable.

scholarly journals Reactive Powder Concrete Containing Basalt Fibers: Strength, Abrasion and Porosity

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2948 ◽  
Author(s):  
Stefania Grzeszczyk ◽  
Aneta Matuszek-Chmurowska ◽  
Eva Vejmelková ◽  
Robert Černý
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Abrasion Resistance ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Volume Distribution ◽  
Basalt Fibers ◽  
Concrete Mix ◽  
Reactive Powder ◽  
The Impact

The paper presents the test results of basalt fiber impact on a compressive and flexural strength, resistance to abrasion and porosity of Reactive Powder Concrete (RPC). The reasons for testing were interesting mechanical properties of basalt fibers, the significant tensile strength and flexural strength, and in particular the resistance to high temperatures, as well as a relatively small number of RPC tests performed with those fibers and different opinions regarding the impact of those fibers on concrete strength. The composition of the concrete mix was optimized to obtain the highest packing density of particles in the composite, based on the optimum particle size distribution curve acc. to Funk. Admixture of basalt fibers was used in quantity 2, 3, 6, 8 and 10 kg/m3, length 12 mm and diameter 18 µm. A low water-to-binder ratio, i.e., from 0.24, was obtained through application of a polycarboxylate-based superplasticizer. The introduction of up to 10 kg/m3 of basalt fibers to RPC mix was proved to be possible, while keeping the same w/c ratio equal to 0.24, with a slight loss of workability of the concrete mix as the content of fibers increased. It was found that the increase of the fiber content in RPC to 10 kg/m3, despite the w/c ratio was kept the same, caused reduction of the concrete compressive strength by 18.2%, 7.8% and 13.6%, after 2, 7, and 28 days respectively. Whereas, the flexural strength of RPC increased gradually (maximum by 15.9%), along with the fiber quantity increase up to 6 kg/m3, and then it reduced (maximum by 17.7%), as the fiber content in the concrete was further increased. The reduction of RPC compressive strength, along with the increase in basalt fibers content, leads to the increase of the total porosity, as well as the change in pore volume distribution. The reduction of RPC abrasion resistance was demonstrated along with the increase of basalt fibers content, which was explained by the compressive strength reduction of that concrete. A linear relation between the RPC abrasion resistance and the compressive strength involves a high determination coefficient equal to 0.97.

scholarly journals Enhancement of the Physical Stability of Amorphous Sildenafil in a Binary Mixture, with either a Plasticizing or Antiplasticizing Compound

Pharmaceutics ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 460
Author(s):  
Justyna Knapik-Kowalczuk ◽  
Krzysztof Chmiel ◽  
Justyna Pacułt ◽  
Klaudia Bialek ◽  
Lidia Tajber ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Physical Stability ◽  
The Other ◽  
Recrystallization Process ◽  
Polymer Content ◽  
Molecular Motions ◽  
Constant Relaxation Time ◽  
High Concentrations ◽  
Amorphous Drug ◽  
The Impact

The main purpose of this paper was to evaluate the impact of both high- and low-Tg polymer additives on the physical stability of an amorphous drug, sildenafil (SIL). The molecular mobility of neat amorphous SIL was strongly affected by the polymeric excipients used (Kollidon VA64 (KVA) and poly(vinylacetate) (PVAc)). The addition of KVA slowed down the molecular dynamics of amorphous SIL (antiplasticizing effect), however, the addition of PVAc accelerated the molecular motions of the neat drug (plasticizing effect). Therefore, in order to properly assess the effect of the polymer on the physical stability of SIL, the amorphous samples at both: isothermal (at constant temperature—353 K) and isochronal (at constant relaxation time—τα = 1.5 ms) conditions were compared. Our studies showed that KVA suppressed the recrystallization of amorphous SIL more efficiently than PVAc. KVA improved the physical stability of the amorphous drug, regardless of the chosen concentration. On the other hand, in the case of PVAc, a low polymer content (i.e., 25 wt.%) destabilized amorphous SIL, when stored at 353 K. Nevertheless, at high concentrations of this excipient (i.e., 75 wt.%), its effect on the amorphous pharmaceutical seemed to be the opposite. Therefore, above a certain concentration, the PVAc presence no longer accelerates the SIL recrystallization process, but inhibits it.

scholarly journals Strength and Acid Resistance of M50 Grade Self-Compacting Concrete

2019 ◽  
Vol 8 (11) ◽  
pp. 1321-1326
Keyword(s):  
High Performance ◽  
Acid Resistance ◽  
High Strength ◽  
Strength Properties ◽  
Self Compacting Concrete ◽  
Fluid Mixture ◽  
Conventional Concrete ◽  
Difficult Condition ◽  
Strength And Durability ◽  
Loss Of Strength

Self-compacting concrete have very high strength and durability and is a fluid mixture of high performance, which is applicable in placing at difficult condition and without any vibrator in the structures with congested reinforcement. Sufficient powder along with a super plasticizer is used to make Self compacting concrete in order to flow it while the coarse aggregate are kept in a vicious suspension.M50 grade self-compacting concrete is developed using fly ash and rice husk ash which are industrial by products. The flow and strength properties of SCC in comparison with conventional concrete are investigated. Concrete is susceptibility to acid (such as nitric acid, hydrochloric acid and acetic acid) attacks because of its alkaline nature. Acid Durability Loss Factor is used to study the loss of strength, stability and weight of SCC in the influence of acid. This factor gives the performance of both strength and durability.

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