Symbiotic Outcomes of Potency and Microstructure on Nano Composite with Microsilica and Nanosilica Additives

2019 ◽  
Vol 57 ◽  
pp. 105-116 ◽  
Author(s):  
Swetha Madhusudanan ◽  
Lilly Rose Amirtham ◽  
S. Nallusamy
Keyword(s):  
Flexural Strength ◽  
Compression Strength ◽  
World Wide ◽  
Concrete Mixture ◽  
Hardened Concrete ◽  
Nano Materials ◽  
Normal Concrete ◽  
Nano Composite ◽  
Maximum Compression ◽  
Concrete Mix

Development and promotion of nano materials and technology has gained more attention of research scholars world wide spreding to different disciplines. In this research an approach has been made to study and investigate the behavioural properties and examine the microstuructural qualities of nano composite bricks replacing the cement with microsilica (mS) and nanosilica (nS) additives. The investigation was conducted using four types of specimens being normal concrete mixture with 0% of mS and nS, with 5%, 6% and 7% of mS, with 1%, 1.5% and, 2% of nS and replacing the cement with mixure of 5%+1%, 6%+1.5% and 7%+2% of mS and nS respectively. The results showed that, the maximum compression strength of 27.62MPa and 37.67MPa with the maximum flexural strength of 22.76MPa and 33.56MPa were possible when 6% of mS and 1.5% of nS were replaced respectively. Also, it was found that the maximum compression strength of 31.47MPa and flexural strength of 31.95MPa were achieved when we add 6%+1.5% mS and nS was added together in the concrete mix. The Scanning Electron Microscope (SEM) results revealed that, the mixture of mS and nS enhances the mechanical properties and the addition of mS and nS gives more symbiotic effects of densifying the microstructure in the hardened concrete mixture leading to better harmonic effects on durability.

Investigation of Critical Quality Assurance Parameter Variations for Concrete

1997 ◽  
Vol 1575 (1) ◽  
pp. 92-101
Author(s):  
Richard K. Smutzer ◽  
Sedat Gulen ◽  
Youlanda K. Belew ◽  
Virgil L. Anderson
Keyword(s):  
High Pressure ◽  
Quality Assurance ◽  
Flexural Strength ◽  
Concrete Strength ◽  
Pulse Velocity ◽  
Hardened Concrete ◽  
Army Corps ◽  
Split Tensile Strength ◽  
Air Content ◽  
Concrete Mix

The Indiana Department of Transportation is involved in preparing statistically sound specifications for strong and durable concrete used in quality assurance programs. Previous laboratory studies relating concrete strength to air content and concrete mix designs dealt with variation in compressive strength. This study searched for a statistically sound relationship between air content, concrete mix designs, and flexural strength. This study also developed a high-pressure method of hardened concrete air content determination. Sixty-four independent batches (combinations) of concrete were produced, each batch was subjected to a total of 24 tests—4 plastic and 20 hardened. The design factors were aggregate type and gradation, plastic air content, cement, and pozzolanic content and testing operator. After plastic testing, three flexural strength beams were cast from each batch of concrete. The experimental design response variables consisted of flexural, compressive, and split tensile strength along with pulse velocity. Analysis of variances, indicated that the optimum flexural strength could be obtained using as-received stone course aggregate and an air content of between 6 percent and 7.9 percent, with no fly ash. A high-pressure air meter, similar to the meter developed by the Army Corps of Engineers, was used. A strong statistical correlation of determination, r2 = 0.94, was obtained between plastic and the hardened concrete air content using this meter.

scholarly journals TINJAUAN HUBUNGAN KUAT TEKAN DAN LENTUR BETON DENGAN BAHAN TAMBAH SERAT BAJA UNTUK PERKERASAN PAKU

2019 ◽  
Vol 3 (1) ◽  
pp. 1-5
Author(s):  
Hermansyah Hermansyah ◽  
Muhammad Fauzie Siswanto ◽  
Ashar Saputra
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Concrete Mixture ◽  
Director General ◽  
Normal Concrete ◽  
Rigid Pavement ◽  
Concrete Quality ◽  
Relationship Of ◽  
The Relationship

The Director General of Highways issued the 2010 revision 3 specification concerning minimum flexural strength for rigid pavement of 45 kg/cm2 or approximately 4.5 MPa, but the reality of obtaining such flexural strength should be using  high enough concrete quality and it will incur considerably high cost also. In this study was using a normal concrete method with the purpose of research to know  the relationship of compressive strength and flexural of concrete with the addition of variation of fiber 0%, 0,5%, 0,65% and 0,8% from weight of the concrete mixture. The results from this research showed that the compressive strength and flexure had increased successively in the fiber variation 0%, 0.5% and 0.65% amount 31.23 MPa, 33.06 MPa, 35.23 MPa and 4.58 MPa, 4.75 MPa, 5.04 MPa. It is because the fiber contained in the concrete has a fairly even distribution of fiber and does not have clumping. When variations of fiber above 0.65% such as 0.8% variation in the direction of fiber are difficult to control and at the time of mixing occurs clumping, So the value of compressive strength and flexural of concrete are decreases. The relation of compressive strength and flexural of concrete using a variation of steel fiber to obtain equation fs = 0,1226.fc '+ 0,7173 with value R2 = 0,9915 and α 0,82. The results obtained from the test is a rather good when compared with ACI and SNI T- 15-1991-03 method.

scholarly journals ANALISIS PENGARUH PENAMBAHAN IJUK 0,25% DAN 0,5% PADA CAMPURAN BETON fc’ 14,5 MPa (NON STRUKTUR)

2022 ◽  
Vol 5 (1) ◽  
pp. 77-82
Author(s):  
Yosi Haristha ◽  
Elfania Bastian
Keyword(s):  
Global Warming ◽  
Test Object ◽  
Organic Waste ◽  
Concrete Mixture ◽  
Normal Concrete ◽  
Concrete Mix ◽  
Materials Used ◽  
Test Objects ◽  
Over Time

Concrete is the majority of materials used in construction in Indonesia in general. Concrete mix innovations are needed so that concrete has better quality and quality. Innovation in concrete mixture one of them by using organic waste. In addition to improving quality, organic waste used is expected to reduce global warming. In Nagari IV Koto Palembayan ijuk from enau trees is not processed and left alone, so over time the ijuk can become waste. In this study discussed the effect of the addition of ijuk in the concrete mixture against the strong press of concrete. The targeted concrete press strong value is 14.5 MPa. The test object is made by varying the amount of ijuk addition in the concrete mixture by 0.25% and 0.5%. The test object used is a cylinder measuring 15cm in diameter and 30 cm high. Testing was conducted when the concrete was 7 days old, 14 days and 28 days old using 2 samples of test objects. The results showed a strong value of normal concrete press age of 28 days obtained at 15.57, while the strong value of additional concrete press ijuk 0.25% and 0.5% obtained by 19.82 MPa and 18.26 MPa. The results showed additional concrete ijuk 0.25% increased by 27.30% from the normal concrete press strength and the strong value of additional concrete press ijuk 0.5% also increased by 17.28% from the strong normal concrete press.

Influence of Anti-Slip Aggregate on Properties of Hardened Concrete

2020 ◽  
Vol 870 ◽  
pp. 39-47
Author(s):  
Waseem Hamzah Mahdi ◽  
Layth Abdul Rasool Mahdi ◽  
Ruba H. Kadhim ◽  
Gufraan A. Kadhim
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Strength Properties ◽  
Concrete Mixture ◽  
Hardened Concrete ◽  
New Materials ◽  
Natural Sand ◽  
Concrete Properties ◽  
Normal Strength ◽  
Tensile Splitting Strength

Nowadays, applying new materials is widely used in concrete construction to study their effects in enhancing the properties and the durability of concrete. This research includes studying the using of manufactured aggregate, which is so-called '' Anti-slip sand '' in specific proportions to know its influence on strength properties of normal strength hardened concrete which involves compressive strength, flexural strength, tensile splitting strength, and density. Anti-slip sand at different rates of (25%, 50%, 75%, and 100%) replaces the natural sand in the concrete mixture to investigate its effect on the properties of concrete. The study shows that the best results of concrete properties are found when replaced the natural sand by 100% of anti-slip sand. Compressive, flexural and tensile strengths of concrete are increased with increment ratios of (44%, 40%, and 20%) respectively compared with other concrete mixture contains only natural sand. In addition, the study shows that the density of hardened concrete is decreased from 2420 kg/m3 in concrete with 100% natural sand to 2360 kg/m3 with a decrement ratio of 2.5% in concrete with 100% anti-slip sand.

scholarly journals PENELITIAN UJI KUAT TEKAN BETON DENGAN MEMANFAATKAN AIR LIMBAH TETES TEBU DAN ZAT ADDITIVE CONCRETE

2019 ◽  
Vol 2 (1) ◽  
pp. 16
Author(s):  
Mochamad Ahsin Ansori ◽  
Ahmad Ridwan ◽  
Yosef Cahyo
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Sugar Cane ◽  
Steel Reinforcement ◽  
Concrete Mixture ◽  
Normal Concrete ◽  
Beam Sample ◽  
Compressive Loads

Concrete has a weakness that is having a low tensile strength and brittle so that the concrete is given steel reinforcement to anticipate it. This addition was carried out to study and determine the effect of sugarcane waste on compressive strength, flexural strength on normal quality concrete with the addition of 0%, 10%, 20% and 30% in compressive loads. Testing is done after 28 days. Concrete with the addition of 30% sugar cane is more capable of producing high flexural strength than the others. Addition of sugar cane drops resulted in optimum compressive strength of 10%, 16.75MPa, 20%, 16.55MPa, 30%, 16.40MPa. For the highest flexural strength of concrete in the 15/15/60 beam sample, the concrete mixture was added to 30% sugar cane by 5.00 MPa, higher than normal concrete 4.96 MPa.Beton mempunyai kelemahan yaitu mempunyai kuat tarik yang rendah dan bersifat getas (brittle) sehingga beton diberi tulangan baja untuk mengantisipasinya. Penambahan ini dilakukan untuk mempelajari dan mengetahui pengaruh limbah tetes tebu terhadap kuat tekan, kuat lentur pada beton mutu normal dengan penambahan 0%, 10%, 20% dan 30% pada beban tekan. Pengujian dilakukan setelah 28 hari. Beton dengan penambahan tetes tebu 30% lebih mampu menghasilkan nilai kuat lentur tinggi dari pada yang lainya. Penambahan limbah tetes tebu menghasilakan kuat tekan optimum yaitu,10%,16,75MPa, 20%,16,55MPa, 30%,16,40MPa. Untuk kuat lentur beton pada sampel balok 15/15/60 yang paling tinggi yaitu pada campuran beton penambahan tetes tebu 30% sebesar 5,00 MPa, lebih tinggi dari pada beton normal 4,96 MPa. 

scholarly journals Penggunaan Bahan Tambah Abu Vulkanik Gunung Gamalama Terhadap Perilaku Beton pada Daerah Lingkungan Laut

2017 ◽  
Vol 6 (01) ◽  
pp. 11
Author(s):  
Imran Imran ◽  
Mufti Amir Sultan ◽  
Julfikra Sastra Tuahuns
Keyword(s):  
Marine Environment ◽  
Environmental Effects ◽  
Compression Strength ◽  
Volcanic Ash ◽  
Sea Water ◽  
Tidal Wave ◽  
Concrete Mixture ◽  
Normal Concrete

AbstrakBeton yang terpengaruh lingkungan laut dapat mengalami penurunan kemampuan yang lebih cepat dari beton yang di darat. Penambahan abu vulkanik sebanyak 15,6% dari berat semen dalam adukan beton menghasilkan mutu beton yang lebih baik dan diharapkan juga dapat memberikan ketahanan yang lebih baik pada beton terhadap efek lingkungan. Pengujian dimaksudkan untuk mengetahui perubahan pada beton setelah 1(satu) bulan dan setelah 6(enam) bulan diletakkan pada lingkungan laut. Hasil yang diperoleh dari kuat tekan beton normal dan beton abu vulkanik dari gunung Gamalama umur 28 hari yaitu sebesar 309,43 kg/cm2 dan 414,89 kg/cm2. Setelah 1(satu) bulan, kuat tekan beton normal yang terendam air laut dan yang terpengaruh pasang surut mengalami peningkatan menjadi 353,47 kg/cm2 dan 392,87 kg/cm2, tetapi setelah 6(enam) bulan beton normal yang terendam air laut mengalami penurunan menjadi 328,20 kg/cm2,sedangkan beton normal pada lingkungan pasang surut meningkat menjadi 398,43 kg/cm2. Hasil untuk kuat tekan beton abu vulkanik masih mengalami peningkatan setelah 1(satu) bulan dan 6(enam) bulan, beton abu vulkanik yang terendam air menghasilkan kuat tekan sebesar 449,66 kg/cm2 dan 538.20 kg/cm2, dan untuk beton abu vulkanik pada lingkungan pasang surut selama 1(satu) bulan dan 6(enam) bulan menghasilkan kuat tekan sebesar 440,39 kg/cm2 dan 514,56 kg/cm2. Kata kunci: lingkungan laut, abu vulkanik gamalama, kuat tekan. AbstractConcrete influenced by marine environment could experience a faster decrease in its ability than those on land. The addition of volcanic ash of 15.6% of the cement weight in the concrete mixture produces better quality of concrete and it is expected that it could give better endurance to the concrete toward the environmental effects. The test was aimed to find out the change in the concrete after 1 (one) and 6 (six) months kept in the marine environment. Result obtained that compression strength of normal concrete and concrete with addition of volcanic ash from Gamalama Mountain with lifespan of 28 days was 309.43 kg/cm2 and 414.89 kg/cm2, respectively. After 1 (one) month, the compression strength of normal concrete submerged in sea water and influenced by tidal wave experienced an increase into 353.47 kg/cm2 and 392.87 kg/cm2, respectively. However, after 6 (six) months normal concrete submerged in sea water experienced a decrease into 328.20 kg/cm2, whereas normal concrete in tidal environment increased into 398.43 kg/cm2. The result for the compression strength of volcanic ash concrete still experienced an increase after 1 (one) month and 6 (six) months. Volcanic ash concrete submerged in the water produced compression strength of 449,66 kg/cm2 and 538.20 kg/cm2, and for volcanic ash concrete in tidal environment for 1 (one) month and 6 (six) months produced compression strength of 440.39 kg/cm2 and 514.56 kg/cm2, respectively. Keyword: sea environment, Gamalama volcanic ash, compression strength.

scholarly journals Consistency and mechanical properties of sustainable concrete blended with brick dust waste cementitious materials

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
S. Y. Amakye ◽  
S. J. Abbey ◽  
A. O. Olubanwo
Keyword(s):  
Tensile Strength ◽  
Fresh Concrete ◽  
Environmental Benefits ◽  
Partial Replacement ◽  
Target Range ◽  
Hardened Concrete ◽  
Index Test ◽  
Demolition Waste ◽  
Concrete Mix ◽  
Brick Dust

AbstractThe reuse of waste materials in civil engineering projects has become the topic for many researchers due to their economic and environmental benefits. In this study, brick dust waste (BDW) derived from cutting of masonry bricks and demolition waste which are normally dumped as land fill is used as partial replacement of cement in a concrete mix at 10%, 20% and 30% respectively, with the aim of achieving high strength in concrete using less cement due to the environmental problems associated with the cement production. To ascertain the effects of BDW on the consistency and mechanical performance of concrete mix, laboratory investigations on the workability of fresh concrete and the strength of hardened concrete were carried out. Slump and compaction index test were carried out on fresh concrete mix and unconfined compressive strength (UCS) test and tensile strength test were conducted on hardened concrete specimen after 7, 14 and 28 days of curing. The results showed high UCS and tensile strength with the addition of 10% BDW to the concrete mix, hence achieving the set target in accordance with the relevant British standards. A gradual reduction in strength was observed as BDW content increases, however, recording good workability as slump and compaction index results fell within the set target range in accordance with relevant British standards. Findings from this study concluded that BDW can partially replace cement in a concrete mix to up to 30% igniting the path to a cleaner production of novel concrete using BDW in construction work.

Measure and Analyze the Problems of Concrete Mixture Production via Six Sigma DMAIC Tools: Central Concrete Mix Plant as a Case Study

2012 ◽  
Vol 622-623 ◽  
pp. 472-477
Author(s):  
Ali A. Karakhan ◽  
Angham E. Alsaffar
Keyword(s):  
Six Sigma ◽  
Business Strategy ◽  
Concrete Mixture ◽  
Statistical Tools ◽  
Sigma Level ◽  
Defect Rate ◽  
Concrete Production ◽  
Concrete Mix ◽  
Six Sigma Methodology

The aims of this study are to measure the defect rate and analyze the problems of production of ready concrete mixture plant by using Six Sigma methodology which is a business strategy for operations improvement depending basically on the application of its sub-methodology DMAIC improvement cycle and the basic statistical tools where the process sigma level of concrete production in the case study was 2.41 σ.

scholarly journals Analysis of influencing factors of flow state concrete mixture performance

2021 ◽  
Vol 2076 (1) ◽  
pp. 012073
Author(s):  
Dandan Shi ◽  
Xing Qin ◽  
Hao Qu
Keyword(s):  
Measurement Method ◽  
Engineering Application ◽  
Performance Testing ◽  
Reducing Agent ◽  
Mineral Admixture ◽  
Raw Material ◽  
Concrete Mixture ◽  
Flow State ◽  
Test Results ◽  
Concrete Mix

Abstract Based on the principle of benefiting the durability of concrete, machined sand is used to configure C40 flow concrete, and the engineering application environment and economy are considered. In this paper, the author through the flow state concrete mix ratio design, give the raw material dosage, concrete mixing, finally combined with the workability measurement method, five groups of concrete mix performance testing. According to the test results, the influence of mineral admixture and water reducing agent on the workability of concrete mixture is studied and analyzed, and the reasonable admixture dosage and water reducing rate of water reducing agent and its admixture dosage are finally given.

scholarly journals Pengaruh Penambahan Serat Kawat Bendrat Terhadap Kuat Lentur Beton Geopolimer

2022 ◽  
Vol 10 (1) ◽  
pp. 69-76
Author(s):  
Indrayani Indrayani ◽  
Lina Flaviana Tilik ◽  
Djaka Suhirkam ◽  
Suhadi Suhadi ◽  
Muhammad Prawira Wardana ◽  
...  
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Concrete Beams ◽  
Tensile Load ◽  
Strength Test ◽  
Coal Waste ◽  
Geopolymer Concrete ◽  
Normal Concrete ◽  
Additional Material ◽  
Flexible Beams

Currently, innovation continues to be developed to replace cement with other materials so that the use of cement as a building material can be reduced. Utilization of coal waste (fly ash) is an alternative to subtitude cement. From previous studies, fly ash mixed with alkaline materials in the form of NaOH and Na2SiO3 in a ratio of 1:5 can produce geopolymer concrete. This geopolymer concrete research was continued by adding bendrat wire fibers into the geopolymer concrete mixture. The method used in testing the aggregate, testing the compressive strength of normal concrete K225, testing the flexural strength of normal concrete and geopolymer concrete refers to SNI. Another additional material that is mixed is bendrat wire fiber. The research was carried out in the form of making flexible beams of 10 cm x 10 cm x 50 cm with fiber variations of 0%, 0.5%, and 1,0% at the age of 14 and 28 days. The results of the flexural strength test of the BN beam at the age of 28 days can withstand loads than BG. The average flexural strength obtained with variations of BN, BN+SB 0.5% and BN+SB 1.0% respectively were 2.796 MPa, 3.113 MPa, and 3.879 MPa. The results of testing the average flexural strength of geopolymer concrete beams at 28 days, obtained variations of BG, BG+SB 0.5%, and BG+SB 1.0% respectively were 0 MPa, 0.055 MPa and 0.104 MPa. In addition, geopolymer concrete cannot be used as a beam and the addition of bendrat wire fiber to geopolymer concrete cannot withstand the tensile load on the concrete.

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