scholarly journals The Influence of Marine Algae on the Mechanical Properties of Concrete

2019 ◽  
Vol 8 (11) ◽  
pp. 536-543
Keyword(s):  
Tensile Strength ◽  
Brown Algae ◽  
Marine Algae ◽  
Construction Material ◽  
Nitrogen And Phosphorus ◽  
Chloride Permeability ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Marine Brown Algae ◽  
The Moment

Concrete dependent on Portland cement is most generally utilized construction material on the planet, and its generation pursues a pattern of development. About 15% of the all-out concrete creation contains synthetic admixtures, which are chemicals added to concrete, mortar or grout at the moment of blending to change their properties, either in fresh or solidified state. Algae are photosynthetic amphibian plants that use inorganic supplements, for example, nitrogen and phosphorus. Around 71% of the world is encompassed by sea, the marine green growth naturally known as seaweeds are a differing gathering of photoautotrophic living beings of different shapes (filamentous, lace like, or plate like) that contain pigments, for example, chlorophyll, carotenoids, and xanthophyll's. It controls the substance response of Cement. It maintains a strategic distance from voids and decline porousness of the solid. To study the strength of marine brown algae concrete different percentages (5%, 10% &15%) of algae are added with cement content to determine the Compression strength , Split Tensile strength concrete ,Shrinkage test and Rapid chloride permeability test for M25, M35 & M40grades of concrete. The Slump of the marine algae concrete is increased as the percentage of Wet Marine Brown algae increases and decrease when compared with the conventional concrete and dry marine algae concrete. The concrete compressive strength is decreased with expanding 15 level of the Wet Marine Brown algae replacement to the conventional concrete and dry marine brown algae concrete. The Split Tensile strength was reduced by 15% Wet Marine Brown algae when compared with conventional concrete.

scholarly journals Durability Properties on Marine Algae Concrete

2019 ◽  
Vol 9 (2) ◽  
pp. 1261-1268
Keyword(s):  
Brown Algae ◽  
Marine Algae ◽  
Concrete Slab ◽  
Acid Attack ◽  
Conventional Concrete ◽  
Cement Ratio ◽  
Marine Brown Algae ◽  
Load Limit ◽  
Water To Cement Ratio ◽  
Durability Of Concrete

Investigation of marine algae had its progress, due to chemical reaction with cement as a result nature gets affected by contamination and thus the inclusion of algae in the concrete found to control the destructive reactions. Algae are natural congenial which adds to the monetary of the concrete and, in the meantime, there is a decline of the wastes. Durability of concrete assumes an essential job in concrete structures. Durability of concrete might be characterized as the capacity of cement to withstand weathering activity and acid attack by retaining its ideal building properties. There are different materials utilized in the concrete to increase durability property. In this investigation, marine brown algae was utilized as added substance with concrete. A fixed water to cement ratio (W/C = 0.5) for M25 grade concrete was adopted with different marine brown algae percentages at 2%, 5% and 8%. The outcome demonstrates that 8% marine algae concrete performed well when contrast with traditional concrete. Deflection behaviour test established that thecrucial load limit of ideal mix concrete slab was found to be higher than the customary conventional concrete slab.

scholarly journals APLIKASI MODIFIED PROCTOR PADA ROLLER COMPACTED NO-FINES CONCRETE DENGAN AGREGAT 5-10 mm

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
ABDIAS TANDY ARRANG
Keyword(s):  
Tensile Strength ◽  
Specific Gravity ◽  
Compression Strength ◽  
Construction Material ◽  
Water Volume ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Cement Ratio ◽  
Roller Machine ◽  
Pavement Construction

The usage of no-fines concrete as pavement currently was being utilized. It was constituted by diversity effort of concrete cement pavement construction material, besides no-fines concrete pavement having benefit that reduce water pond on pavement surface rapidly because of its pervious. Permeability character of no-fines concrete will recharge groundwater deposit therefore more environmental friendly. Problem faced is low strength of no-fines concrete as compared to conventional concrete. Therefore it is required the effort of increasing the strength of no-fines concrete by increase concrete density that is done by roller machine. No-fines concrete that is compacted by roller machine is called Roller Compacted No-fines Concrete (RCNC). This research analyzed the increase of concrete properties especially compression strength and split tensile strength effected by external compaction using modified proctor in creating the laboratory specimen. Materials of no-fines concrete utilized Clereng coarse aggregate with size 5-10 mm, Gresik Portland cement and the aggregate cement ratio is 4 and 6. To accelerating the hardening concrete utilized admixture type C which is sikaset accelerator with 20% of total water volume. The blow variation of modified Proctor per layer is 28, 42 and 56. Compression test and split tensile test been done at the age of  1 and 28 days. Result of research showed the increase of concrete specific gravity and compression strength in line with the increase of blow variation. RCNC specific gravity acquired ranging between 1,544 and 1,788. Compression strength at the age of 28 days acquired were (1) aggregate cement ratio 4 with 28, 42, 56 blows per layer were 21,47 MPa, 22,92 MPa, 26,55 MPa (2) aggregate cement  ratio 6 each were 8,48 MPa, 10,51 MPa, 14,82 MPa. Split tensile strength at the age of 28 days were (1) aggregate cement ratio 4 with 28, 42, 56 blows per layer each were 2,27 MPa, 2,92 MPa, 3,13 MPa (2) aggregate cement ratio 6 each were 1,63 MPa, 1,83 MPa, 2,08 MPa.

scholarly journals Replacement of Conventional Concrete by Light Weight Concrete

2021 ◽  
Vol 9 (11) ◽  
pp. 1760-1766
Author(s):  
Nadeem Ul Haq
Keyword(s):  
Lightweight Concrete ◽  
Construction Material ◽  
Unit Weight ◽  
Light Weight ◽  
Chloride Permeability ◽  
Conventional Concrete ◽  
Lower Weight ◽  
The Moment ◽  
The Relationship ◽  
Light Weight Aggregate

Abstract: Lightweight concrete (LWC) allows for larger spans, fewer piers, and longer bridge designs due to its lower weight and improved durability. Because superstructures with broader shoulders or additional lanes may be improved without requiring extensive work on the substructure, LWC is a particularly desirable construction material at the moment. The goal of this research was to determine the density (unit weight), splitting tensile strength, and elastic modulus of LWC mixtures under various curing circumstances in order to gain a better knowledge of LWC qualities that are critical for long-lasting and costeffective buildings. The researchers also looked at the relationship between the results of the fast chloride permeability test and the outcomes of other tests and the Werner probe surface resistance test to see if the latter may be used to forecast the permeability of LWC mixtures because it is faster and more convenient. Keywords: Light weight aggregate, pumice, compressive strength, density,

scholarly journals Effect of Recycled Coarse Aggregate and Bagasse Ash on Two-Stage Concrete

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 556
Author(s):  
Muhammad Faisal Javed ◽  
Afaq Ahmad Durrani ◽  
Sardar Kashif Ur Rehman ◽  
Fahid Aslam ◽  
Hisham Alabduljabbar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Construction Material ◽  
Strength Reduction ◽  
Recycled Aggregate ◽  
Two Stage ◽  
Conventional Concrete ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates

Numerous research studies have been conducted to improve the weak properties of recycled aggregate as a construction material over the last few decades. In two-stage concrete (TSC), coarse aggregates are placed in formwork, and then grout is injected with high pressure to fill up the voids between the coarse aggregates. In this experimental research, TSC was made with 100% recycled coarse aggregate (RCA). Ten percent and twenty percent bagasse ash was used as a fractional substitution of cement along with the RCA. Conventional concrete with 100% natural coarse aggregate (NCA) and 100% RCA was made to determine compressive strength only. Compressive strength reduction in the TSC was 14.36% when 100% RCA was used. Tensile strength in the TSC decreased when 100% RCA was used. The increase in compressive strength was 8.47% when 20% bagasse ash was used compared to the TSC mix that had 100% RCA. The compressive strength of the TSC at 250 °C was also determined to find the reduction in strength at high temperature. Moreover, the compressive and tensile strength of the TSC that had RCA was improved by the addition of bagasse ash.

scholarly journals IMPACT OF USING STONE POWDER AND MINERAL ADMIXTURES IN HIGH STRENGTH CONCRETE

2020 ◽  
Vol 4 (5) ◽  
pp. 82-87
Author(s):  
Afzal Basha Syed ◽  
Jayarami Reddy B ◽  
Sashidhar C
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Mineral Admixtures ◽  
Test Results ◽  
Concrete Technology ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Strength Concrete

In present era, high-strength concrete is progressively utilized in modern concrete technology and particularly in the construction of elevated structures. This examination has been directed to explore the properties of high-strength concrete that was delivered by using stone powder (SP) as an option of extent on sand after being processed. The aim of the research is to study the effect of replacement of sand with stone powder and substitution of cement with mineral admixtures (GGBS & Zeolite) on the mechanical properties of high strength concrete. The test results showed clear improvement in compression and split tensile nature of concrete by using stone powder and mineral admixtures together in concrete. The increment in the magnitude of compressive strength and split tensile strength are comparable with conventional concrete.

scholarly journals Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete

2021 ◽  
Vol 7 (2) ◽  
pp. 226-235
Author(s):  
Faisal K. Abdulhussein ◽  
Zahraa F. Jawad ◽  
Qais J. Frayah ◽  
ِAwham J. Salman
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Physical Properties ◽  
Construction Material ◽  
Dry Density ◽  
Split Tensile Strength ◽  
Maximum Enhancement ◽  
Concrete Mixtures ◽  
Traditional Construction

This paper investigates the effect of nano-papyrus cane ash as an additive on concretes’ mechanical and physical properties. Three types of concrete mixtures, 1:2:4, 1:1.5:3, and 1:1:2 were prepared for each mixture, nano-papyrus ash was added in five different dosages of 0.75, 1.5, 3, 4.5, and 6% by weight of cement; therefore, eighteen mixes would be studied in this work. Physical properties represented by dry density and slump were also measured for each mix. Moreover, to evaluate the mechanical properties development split tensile strength and compressive strength were obtained at age (7 and 28). Results manifested that the adding of nano ash developed the compressive strength and split tensile strength of concrete and the maximum enhancement recognized in the mixes with a content of 4.5% nano-papyrus in each studied mixture in this work. The slump test results indicated that the workability of concrete increased with adding nano-papyrus ash gradually with increasing nanoparticles' content. As well as, dry density was significant increased with nano-papyrus ratio; greater values were recorded in mixtures with 1.5-4.5% content of nano-papyrus. When comparing the concrete mixes used, it was found that the best results were obtained with 1:1:2 mixtures. This remarkable improvement in concrete properties considers the nano-papyrus is considered a cement economical and useful replacement for traditional construction material. Doi: 10.28991/cej-2021-03091649 Full Text: PDF

scholarly journals A Study on Mechanical Properties of Conventional Concrete and Coconut Shell Concrete by Replacing Cement with Silica Fume

2018 ◽  
Vol 7 (2.12) ◽  
pp. 437
Author(s):  
V R.Prasath Kumar ◽  
K Gunasekaran ◽  
Sreerag K P
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Building Materials ◽  
Coarse Aggregate ◽  
Coconut Shell ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Coconut Shells

High standing estimation of building materials utilized for development is a component of incredible concern. Coconut shell as a completely substitution in the place of coarse aggregate may totally effective for designers in construction industry. The coconut shell concrete is a light weight solid which may decrease the self-heap of a structure. The under taken project depends on inspecting attributes of coconut shell concrete when contrasted with conventional concrete. Coconut shells going from 10mm strainer and held on 6.3mm were considered to utilize for this study. For the current study M100 grade concrete is used to cast the specimens. The principle properties considered testing on coconut shell concrete and conventional concrete is compressive strength, split tensile strength and flexural strength. Examples were taken by supplanting coarse aggregate with coconut shells completely and cement is supplanted by silica fume with various extents of 5%, 10%, 15%, 20%, 25% for compressive strength test and tests were done at 3, 7, 28, 56 and 90 days of curing, it is observed that the ideal compressive strength outcomes were obtained at 10% of silica fume. The flexural strength and  split tensile strength of the specimens are calculated with replacement of cement by silica fume with  different extents of 0%, 5%, 10% and 15%, tests were done at 3, 7 and 28 days of curing. The optimum replacement percentage of cement by silica fume is 10% for compressive strength, split tensile and flexural strength. The primary principle is to lessen the utilization of natural aggregate by supplanting them with coconut shells and to decrease the density of concrete which makes concrete for simple dealing.  

HYPOCHOLESTEROLEMIC AGENTS DERIVED FROM STEROLS OF MARINE ALGAE

1962 ◽  
Vol 40 (10) ◽  
pp. 1401-1406 ◽  
Author(s):  
E. Reiner ◽  
J. Topliff ◽  
J. D. Wood
Keyword(s):  
Cholesterol Level ◽  
Brown Algae ◽  
Marine Algae ◽  
Plasma Cholesterol ◽  
Plasma Cholesterol Level ◽  
Sargassum Muticum ◽  
Marine Brown Algae ◽  
Hypocholesterolemic Agents

Sterols isolated from two species of marine brown algae, Fucus gardneri and Sargassum muticum, were fed to young Leghorn cockerels. Both sterols caused a significant diminution in plasma cholesterol level.

scholarly journals A review on phytoconstituents of marine brown algae

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Masuma M. Hakim ◽  
Illa C. Patel
Keyword(s):  
Bioactive Compounds ◽  
Brown Algae ◽  
Marine Algae ◽  
Biological Activities ◽  
Bioactive Compound ◽  
Biological Properties ◽  
Main Body ◽  
Marine Brown Algae ◽  
Hard State ◽  
Gujarat Coast

Abstract Background From the last few years, the development and discovery of bioactive compounds and their potential properties from marine algae have been enhanced significantly. The coastal area is a huge storehouse for propitious algae. It has been the genuine reality that the consequence of marine algae as a source of different compounds is increasing. Main body Numerous advanced research devices are available for the discovery of synthetic compounds but still many researchers are working on natural bioactive compounds to discover their biological properties, which are useful to society. Marine algae are taking the preponderance of consideration from investigators owing to its phenomenon of biological activity like anti-cancer, anti-viral, cholesterol-reducing, and many more. A variety of compounds are collected from algae with specific purposes as they remain in an extremely ambitious and hard state; this condition is responsible for the synthesis of very particularly effective bioactive compounds. The present article is concentrating on the brown algae of the Gujarat coast, phlorotannins, polyphenol, phytosterol from brown algae, and their various applications. The main importance has been given to the secondary metabolites and various applications of marine brown algae. Conclusion From this review, it can be concluded that the prominent bioactive compounds from brown algae can cure many serious diseases. Besides, the potential biological activities of a special bioactive compound may represent the interest in the industry of pharmaceuticals, cosmeceutical, and functional foods.

scholarly journals Effect of Silica fume on Ordinary Portland Cement and Polymer Concrete Made out of M Sand

2019 ◽  
Vol 9 (2S2) ◽  
pp. 42-46
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Fume ◽  
Unsaturated Polyester ◽  
High Strength ◽  
Pozzolanic Reaction ◽  
Maximum Strength ◽  
Polymer Concrete ◽  
Split Tensile Strength ◽  
Conventional Concrete

In this investigation, conventional concrete was made with replacing the sand by 80 % of M-sand and the cement by fillet material silica fume in varying percentages say 5%, 10 % , and 15%, to study the compressive strength, split tensile strength and flexural strength. In order to the maximum strength was attained at 10% of silica fume. The result showed that by increasing the silica fume content, the strength of the M-sand concrete was decreased because higher fineness of silica fume content decreases the strength of the M-sand concrete. Secondly polymer concrete with unsaturated polyester resin with hardener MEKP, Cobalt as the accelerator and silica fume in varying percentages say 0%, 5% and 10% was made to study the compressive strength and split tensile strength of polymer concrete. In improved silica fume content the strength was high. Polymer concrete improved the mechanical properties. Polymer concrete system was mainly useful to fill the micro voids. In this research, the maximum strength was attained at 5% of silica fume filler added with polymer concrete. Thus the high strength of the concrete was obtained due to the pozzolanic reaction with the silica fume.

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