Natural Mineral for Improving Concrete Compressive Strength

2014 ◽  
Vol 875-877 ◽  
pp. 1490-1494
Author(s):  
Abdoullah Namdar ◽  
Ideris Bin Zakaria ◽  
Azam Khodashenas Pelko ◽  
Nurmunira Binti Muhammad
Keyword(s):  
Crystal Structure ◽  
Compressive Strength ◽  
Research Work ◽  
Cost Effective ◽  
Construction Cost ◽  
Mixed Design ◽  
Concrete Compressive Strength ◽  
Natural Mineral ◽  
Concrete Quality

Several concrete additives have been innovated for improving concrete quality. In this research work the treated kaolin by heat has been used as concrete additive. Kaolin was subjected to the heat for 1 hour in different degree of temperatures. The crystal structure of Kaolin thermally is modified under heat and microstructure of the hydrated samples has been investigated using FESEM. The main objective is to introduce a cost effective concrete additive. The result is indicated that when kaolin subjected to 800 oC and used in 6% quantity as an additive in concrete mixed design, the concrete compressive strength of 14 days is 40% higher than concrete compressive strength of 28 days which is not used any additive. And if 12% additive is used the concrete compressive strength increased in same level on 7 days. This concrete additive reduces construction cost and time.

scholarly journals Cyclic performance of exterior R.C beam-column strengthened with different thicknesses of CFRP sheets

2022 ◽  
Vol 961 (1) ◽  
pp. 012069
Author(s):  
Mustafa Kareem Hamzah ◽  
Raizal Saifulnaz M. Rashid ◽  
Farzad Hejazi
Keyword(s):  
Compressive Strength ◽  
Plastic Hinge ◽  
Cost Effective ◽  
Cyclic Performance ◽  
Concrete Compressive Strength ◽  
Cfrp Sheets ◽  
Panel Zone ◽  
External Strengthening ◽  
Damage States ◽  
Hinge Zone

Abstract The recent ground motion results indicated that the RC buildings are required to be retrofitted by different strengthening techniques. Nowadays, the external strengthening gain interest since its easy, cost effective and not required redesign of buildings. The CFRP sheets are suitable solution and utilized by a number of researchers. However, the numerical cyclic performance of connection strengthened with different thicknesses of CFRP need to be well investigated. This study assessed the performance of RC exterior beam column connection strengthened with CFRP sheets First, two grades of concrete are utilized to be control specimens, normal concrete compressive strength (C20) and high concrete compressive strength (C50) then, the specimens are retrofitted with different thicknesses (1.2, 2.4, 3.6mm) of CFRP sheets. The stresses and damage states showed the importance of connection retrofitting. The CFRP shift the plastic hinge zone away from the panel zone. Furthermore, the results demonstrated that by increase of CFRP thickness the connection resistance will be improved. The comparison between the hysteresis curves demonstrated that the yield and ultimate loading were enhanced for strengthened connection for both concrete grades and the incremental in thicknesses also increase them. The outputs also exhibited that the stiffness and ductility has increased for retrofitted specimens indicating that the CFRP comprehensively overcome the applied cyclic loading and the beam column connection is able to resist such type of loading.

scholarly journals ANALISA PENGARUH ADMIXTURE TERHADAP ABU TERBANG (FLY ASH) DAN BOTTOM ASH

2018 ◽  
Vol 6 (2) ◽  
pp. 114-123
Author(s):  
Redaksi Tim Jurnal
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Fresh Concrete ◽  
Setting Time ◽  
Bottom Ash ◽  
Initial Time ◽  
Concrete Compressive Strength ◽  
Concrete Temperature ◽  
Concrete Quality

With improve the quality of concrete is by using the addition of admixture. By adding admixture Silica fume and superplasticizer is expected to improve concrete quality in concrete using fly ash and bottom ash. The main objective of this research is to know the value of concrete compressive strength, slump test value, fresh concrete temperature and setting time in concrete using fly ash and bottom ash by 0%, 5%, 10%, 15%, 20% and 25% by weight of cement, with variations of silica fume 0%, 2%, 4%, 6 %, 8%, 10% of the weight of cement that has been reduced by the weight of fly ash and bottom ash and added with superplasticizer of 2% of the water requirement. The planned concrete quality was 41.7 MPa at 28 days, with the sample tested at age 7, 14, 28 days. Based on the results of the highest concrete compressive strength test for fly ash concrete (fly ash) is found in FA mixture variation 10%, SP 4%, SF 2% that is equal to 56,16 MPa. And for mixed bottom ash the highest compressive strength on mixed variation of BA 5%, SF 2%, SP 2% is equal to 49,82 MPa. Fresh concrete temperature variation of FA mixture 5%, SF 2%, SP 2% and BA 5%, SF 2%, SP 2% rose one degree from normal concrete temperature. Setting time generated on mixed concrete FA 5%, SF 2%, SP 2% has the fastest initial time setting ie 251 minutes of all variations of concrete mix.

scholarly journals Pengaruh Abu Arang Sebagai Campuran Beton Ditinjau Dari Kuat Tekan

Teknika ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 16
Author(s):  
Hani Purwanti ◽  
Galih Widyarini
Keyword(s):  
Compressive Strength ◽  
Potassium Silicate ◽  
Partial Replacement ◽  
Concrete Compressive Strength ◽  
Main Ingredient ◽  
Concrete Material ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Cement Mixture ◽  
Compressive Strength Of Concrete

<p align="center"><strong><em>Abstract</em></strong></p><p><em>Cement which is the main ingredient in making concrete contains non-renewable natural ingredients, potassium silicate. This causes an increase in cement prices every year. In overcoming these problems, there needs to be a modification in concrete mixes that are more environmentally friendly. Mixtures that are able to reduce the need for cement and contain potassium silicate such as charcoal are selected in modified concrete mix material by reviewing compressive strength. The purpose of this study was to determine how much influence the composition of charcoal as a substitute for cement in the preparation of concrete material was observed from compressive strength. The composition of the cement mixture will be replaced with charcoal by 0%, 5% and 10% with concrete compressive strength which is expected to have K200 quality. The research method uses an experimental method for sampling data. There are 3 (three) specimens in each percentage of addition of charcoal. The results of concrete compressive strength with a concrete age of 7 days, 22 days and 28 days under normal conditions without mixture are 31 Mpa, 35 Mpa, and 38 Mpa. The compressive strength of concrete mixed with charcoal as much as 5% is 30 Mpa, 31 Mpa, 36 Mpa. In 10% charcoal mixed concrete is 20 MPa, 27 MPa, and 29 MPa. The results of the compressive strength of the three conditions each showed a decrease in the trend of concrete age 7 days, 21 days and 28 days. Even though the trend has decreased, the compressive strength of the concrete produced still meets K200. This shows that charcoal ash can be used as an alternative to a partial replacement of cement in the concrete mixture for K200 concrete quality.</em></p><p align="center"> </p><p align="center"><strong>Abstrak</strong></p><p>Semen yang merupakan bahan utama pembuatan beton mengandung bahan dasar alam yang tidak dapat diperbarui yaitu kalium silikat. Hal ini menyebabkan adanya peningkatan harga semen setiap tahun. Dalam mengatasi permasalahan tersebut, perlu adanya suatu modifikasi pada campuran beton yang lebih ramah lingkungan. Bahan campuran yang mampu mengurangi kebutuhan semen serta mengandung kalium silikat seperti abu arang dipilih dalam bahan campuran beton modifikasi dengan meninjau kuat tekan.Tujuan penelitian ini adalah untuk mengetahui seberapa besar pengaruh komposisi abu arang sebagai pengganti semen dalam penyusunan material beton ditinjau dari kuat tekan. Adapun komposisi campuran semen yang akan digantikan dengan abu arang sebesar 0%, 5% dan 10% dengan kuat tekan beton yang diharapkan memiliki mutu K200. Adapun metode penelitian ini menggunakan metode eksperimen untuk pengambilan sampel data. Terdapat masing – masing 3 (tiga) benda uji di setiap persentase penambahan abu arang.Hasil kuat tekan beton dengan usia beton 7 hari, 22 hari dan 28 hari dalam kondisi normal tanpa campuran adalah 31 Mpa, 35 Mpa, dan 38 Mpa. Kuat tekan beton yang dicampur abu arang sebanyak 5 % adalah 30 Mpa, 31 Mpa, 36 Mpa. Pada beton campuran abu arang 10% adalah 20 Mpa, 27 Mpa, dan 29 Mpa. Hasil kuat tekan dari ketiga kondisi tersebut masing – masing menunjukkan adanya penurunan trend dari usia beton 7 hari, 21 hari dan 28 hari. Walaupun trend mengalami penurunan, akan tetapi nilai kuat tekan beton yang dihasilkan masih memenuhi K200.Hal tersebut menunjukkan bahwa abu arang dapat digunakan sebagai alternatif pengganti sebagian semen pada campuran beton untuk mutu beton K200.</p><p> </p>

scholarly journals UJI KUAT TEKAN DAN KUAT TARIK BELAH PADA BETON DENGAN SERAT KAWAT NYAMUK PADA MUTU FC’ = 19,3 MPA

2019 ◽  
Vol 14 (1) ◽  
pp. 30
Author(s):  
Handika Setya Wijaya ◽  
Adrianus Tandi
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Construction Materials ◽  
High Strength ◽  
Primary Data ◽  
Concrete Compressive Strength ◽  
Irrigation Channels ◽  
Concrete Quality ◽  
Compressive Strength Of Concrete

Concrete is one of the construction materials that is currently widely used by the community to build buildings. This is evidenced by the large number of construction of buildings, roads, irrigation channels and other construction. Until now, Indonesian people still use a little concrete. The problem that we want to know is how the effect of adding mosquito wire fiber to compressive strength, tensile strength and elastic modulus of concrete using concrete quality fc '= 19.3 MPa. The purpose of this study is to add additional mosquito wire fiber can be used as an added component of concrete components that have high strength and good quality but are economically valuable for compressive strength, tensile strength and elastic modulus. The method used is secondary and primary data. The results of this study are compressive strength 0% = 15,839 MPa, 1% = 13,657 MPa, 3% = 10,137 MPa, 5% = 9,173 MPa, tensile strength 0% = 7,392 MPa, 1% = 8,205 MPa, 3% = 8,504 MPa, 5% = 9,038 MPa. and elastic modulus 0% = 29131,385 N / mm2, 1% = 14575.68 N / mm2, 3% = 10303,133 N / mm2, 5% = 7030,893 N / mm2. The results of this study found that the addition of mosquito wire fiber can reduce the compressive strength of concrete and modulus. While the tensile strength and modulus of elasticity increase. So that the mosquito wire is not suitable for concrete compressive strength and elastic modulus.

scholarly journals Assessment of the Suitability of Paper Waste as an Engineering Material

2014 ◽  
Vol 4 (6) ◽  
pp. 724-727 ◽  
Author(s):  
O. M. Okeyinka ◽  
O. J. Idowu
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Health Risks ◽  
Environmental Sustainability ◽  
Laboratory Experiments ◽  
Research Work ◽  
Cost Effective ◽  
Waste Paper ◽  
Engineering Material ◽  
Potential Applicability

This research work investigates the potential applicability of waste paper in the production of ceiling boards with focus on achieving: environmental sustainability, safe disposal of waste paper and more cost effective production of materials. The main view was to provide an alternative to the conventional asbestos ceiling boards that are costly and also pose health risks. Three mix designs were formulated and used for the casting (1:1, 1:1.5 and 1:2), varying in regards of the weight of the waste paper components. CaCO3 was added to the mix as an additive as well as starch bond glue to aid binding. Laboratory experiments were conducted to determine the properties and suitability of the produced boards. Properties such as water absorption, abrasion, compressive strength, flexural strength and ultimate loads were considered for comparison. The boards with 1:1 mix ratio displayed the best results of the test properties hence, its mechanized manufacturing was recommended.

PENGARUH PENAMBAHAN PASIR BESI TERHADAP KUAT TEKAN BETON K-300

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Erny Agusri ◽  
Masri A Rivai
Keyword(s):  
Compressive Strength ◽  
Concrete Compressive Strength ◽  
Normal Concrete ◽  
Concrete Quality

The purpose of this study was to determine the effect of iron sand on the K-300 concrete compressive strength. Iron sand added with a variation of 2-4% using cube-shaped specimens with dimensions of 15 × 15 × 15 cm as many as 27 samples consisting of 3 variations, each with 9 samples, concrete quality tested at 3, 7, and 28 days. The results showed the compressive strength of normal concrete characteristics at 3 days of age was 238.76 Kg / cm2, 7 days was 270.64 Kg / cm2, and 28 days was 370.16 Kg / cm2, the addition of iron sand was 2% at 3 days amounting to 192.33 Kg / cm2 with an effect of -6.11%, 7 days amounting to 262.14 Kg / cm2with an effect of -3.87%, 28 days at 314.77 Kg / cm2 with an influence of -11.8%, addition of iron sand 3% at 3 days at 207.88 Kg / cm2 with an effect of -14.65 %, 7 days amounting to 262.28 Kg / cm2 with an effect of -4.94%, 28 days at 296.64 Kg / cm2 with influenceat -16.8%, the addition of 4% iron sand at 3 days at 178.06 Kg / cm2 with an effect of -14.97%, 7 days at 236.13 Kg / cm2 with an effect of -10.3% 28 days at 264.58 Kg / cm2 with an effect of -26.2%. based on the results of the study it can be concluded that the more iron sand we use, the more there is a decrease in the concrete compressive strength

Variasi Penambahan Sika Cim Dan Fiber Kawat Pada Beton Mutu Fc’ 30 Mpa

2018 ◽  
Vol 9 (2) ◽  
pp. 67-73
Author(s):  
M Zainul Arifin
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Curing Temperature ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Normal Concrete ◽  
Astm Method ◽  
Additive Type ◽  
Composition Variation ◽  
Compressive Strength Of Concrete

This research was conducted to determine the value of the highest compressive strength from the ratio of normal concrete to normal concrete plus additive types of Sika Cim with a composition variation of 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1 , 50% and 1.75% of the weight of cement besides that in this study also aims to find the highest tensile strength from the ratio of normal concrete to normal concrete in the mixture of sika cim composition at the highest compressive strength above and after that added fiber wire with a size diameter of 1 mm in length 100 mm with a ratio of 1% of material weight. The concrete mix plan was calculated using the ASTM method, the matrial composition of the normal concrete mixture as follows, 314 kg / m3 cement, 789 kg / m3 sand, 1125 kg / m3 gravel and 189 liters / m3 of water at 10 cm slump, then normal concrete added variations of the composition of sika cim 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1.5%, 1.75% by weight of cement and fiber, the tests carried out were compressive strength of concrete and tensile strength of concrete, normal maintenance is soaked in fresh water for 28 days at 30oC. From the test results it was found that the normal concrete compressive strength at the age of 28 days was fc1 30 Mpa, the variation in the addition of the sika cim additive type mineral was achieved in composition 0.75% of the cement weight of fc1 40.2 Mpa 30C. Besides that the tensile strength test results were 28 days old with the addition of 1% fiber wire mineral to the weight of the material at a curing temperature of 30oC of 7.5%.

PENGKAJIAN KEKUATAN BETON STRUKTUR JEMBATAN PASCA KEBAKARAN

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Sudarmadi Sudarmadi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Strength Assessment ◽  
Concrete Testing

In this paper a case study about concrete strength assessment of bridge structure experiencing fire is discussed. Assessment methods include activities of visual inspection, concrete testing by Hammer Test, Ultrasonic Pulse Velocity Test, and Core Test. Then, test results are compared with the requirement of RSNI T-12-2004. Test results show that surface concrete at the location of fire deteriorates so that its quality is decreased into the category of Very Poor with ultrasonic pulse velocity ranges between 1,14 – 1,74 km/s. From test results also it can be known that concrete compressive strength of inner part of bridge pier ranges about 267 – 274 kg/cm2 and concrete compressive strength of beam and plate experiencing fire directly is about 173 kg/cm2 and 159 kg/cm2. It can be concluded that surface concrete strength at the location of fire does not meet the requirement of RSNI T-12-2004. So, repair on surface concrete of pier, beam, and plate at the location of fire is required.

Knee Muscle Force Estimating Model Using Machine Learning Approach

2020 ◽  
Author(s):  
Anurag Sohane ◽  
Ravinder Agarwal
Keyword(s):  
Machine Learning ◽  
Random Forest ◽  
Muscle Force ◽  
Vastus Lateralis ◽  
Input Parameter ◽  
Research Work ◽  
Cost Effective ◽  
Coefficient Of Determination ◽  
Muscle Forces ◽  
Knee Muscle

Abstract Various simulation type tools and conventional algorithms are being used to determine knee muscle forces of human during dynamic movement. These all may be good for clinical uses, but have some drawbacks, such as higher computational times, muscle redundancy and less cost-effective solution. Recently, there has been an interest to develop supervised learning-based prediction model for the computationally demanding process. The present research work is used to develop a cost-effective and efficient machine learning (ML) based models to predict knee muscle force for clinical interventions for the given input parameter like height, mass and angle. A dataset of 500 human musculoskeletal, have been trained and tested using four different ML models to predict knee muscle force. This dataset has obtained from anybody modeling software using AnyPyTools, where human musculoskeletal has been utilized to perform squatting movement during inverse dynamic analysis. The result based on the datasets predicts that the random forest ML model outperforms than the other selected models: neural network, generalized linear model, decision tree in terms of mean square error (MSE), coefficient of determination (R2), and Correlation (r). The MSE of predicted vs actual muscle forces obtained from the random forest model for Biceps Femoris, Rectus Femoris, Vastus Medialis, Vastus Lateralis are 19.92, 9.06, 5.97, 5.46, Correlation are 0.94, 0.92, 0.92, 0.94 and R2 are 0.88, 0.84, 0.84 and 0.89 for the test dataset, respectively.

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