Optimum Autoclaved Cement Concrete Mix Design Based on Flexural Strength

2011 ◽  
Vol 189-193 ◽  
pp. 676-679 ◽  
Author(s):  
Chang Jun Ke ◽  
Qin Hu ◽  
Pan Jiang ◽  
Li Zhang

optimized mix proportion of autoclaved cement concrete by orthogonal test, and studied effect of two type fibers for the flexural strength of autoclaved cement concrete by the mix proportion of autoclaved concrete. The results showed, wollastonite and plant fiber were favorable to increasing the flexural strength of autoclaved cement concrete. Content of wollastonite was about 15% of cement mass, and increase amplitude of the flexural strength was more than 40% and the compressive strength slightly increased for autoclaved cement concrete admixed wollastonite. Content of plant fiber was about 1.5% of cement mass, increase amplitude of the flexural strength was more than 20%, but compressive strength change of autoclaved cement concrete was not significant for autoclaved cement concrete admixed plant fiber.

2011 ◽  
Vol 99-100 ◽  
pp. 692-695
Author(s):  
Tie Quan Ni ◽  
Li Zhang ◽  
Bing Yuan

The influence of wollastonite or plant fiber on the property of autoclaved cement concrete is studied by chemical composition analysis, X-ray diffraction analysis, scanning electron microscopy and energy spectrum analysis. The results showed that the two fibers were benefit to bending strength of autoclaved cement concrete. The suitable content of wollastonite was about 15% of cement mass, and the increased amplitude of flexural strength was more than 30% and the compressive strength slightly increased for autoclaved cement concrete admixed wollastonite. The optimal content of plant fiber was about 1.5% of cement mass, the increased amplitude of the flexural strength was more than 20%, and the compressive strength change of autoclaved cement concrete was not significant for autoclaved cement concrete admixed plant fiber.


2013 ◽  
Vol 701 ◽  
pp. 12-16 ◽  
Author(s):  
Mohd Irwan Juki ◽  
Khairunnisa Muhamad ◽  
Mahamad Mohd Khairil Annas ◽  
Koh Heng Boon ◽  
Norzila Othman ◽  
...  

This paper describes the experimental investigation to develop the concrete mix design Nomograph for concrete containing PET as fine aggregate. The physical and mechanical properties were determined by using mix proportion containing 25%, 50% and 75% of PET with water cement ratio (w/c) 0.45, 0.55 and 0.65. The data obtained showed that the inclusion of PET aggregate reduce the strength performances of concrete. All the data obtained were combined into one single graph to develop a preliminary mix design nomograph for PET concrete. The nomograph consist of ; relationship between compressive strength and water cement ratio; relationship between splitting tensile strength water cement ratio; relationship between splitting tensile strength and PET percentage and relationship between compressive strength and PET percentage. The mix design nomograph can be used to assists in selecting the proper mix proportion parameters based on the criteria required.


2020 ◽  
Vol 8 (5) ◽  
pp. 4476-4481

surely glass powder in concrete can be considered one of the most important or relevant fibers as partial replacement aiming to change or improving the properties of concrete. This work was made in the endeavor to know the influence of glass powder when is mixed or replacing cement in concrete using proportion 0%, 10%, 20% and 30%, using m20 grade of concrete. Considered two factors as age and mix proportion, was found the compressive results, also the result of tensile and flexural strength results at 3 days, another one at 7 days, at 28 days and 90 days curing concrete, the study was conducted, using cubes specimens after testes was found reporting that using glass powder in the m20 grade of mix design of concrete as cement replacement shows many advantages in its application on concrete, not only in reducing the co2 emissions to earth’s atmosphere as is written on the first part of this work but also the result show that the proportion up to 20% can improve its compressive strength in concrete, in terms of flexural strength was found increasing up to 10% of glass powder when used in concrete and was found also the optimal proportion in split tensile at 20% of glass powder.


2016 ◽  
Vol 711 ◽  
pp. 382-389 ◽  
Author(s):  
Taghried Isam Abdel-Magid ◽  
Ogail Mahgoub Osman ◽  
Omer Haider Ibrahim ◽  
Rayan Tarig Mohammed ◽  
Sowaiba Osman Hassan ◽  
...  

In this paper, the effect of seawater on concrete mix was studied. Seawater was fetched from the Red Sea near Port Sudan. Forty eight concrete cubes were prepared using constant water/cement ratio. The first two groups were both mixed with fresh water then cured in fresh water and seawater, respectively. The third and fourth groups were both mixed with seawater but cured in seawater and fresh water, respectively. All four groups were tested for permeability after seven days. Likewise, they were tested after 7, 28 and 90 days for compression strength. Twelve beams and a dozen cylinders were prepared in the same manner and tested after 28 days for both flexural and tension strengths. Slight increase in compressive strength was noticed in specimens mixed with fresh water and cured in seawater at 7 and 90 days, while no vital change was observed at age 28 days. Neither tension strength nor durability were affected with sea water. Nonetheless, flexural strength decreased for those specimens mixed with seawater and cured in fresh water.


2018 ◽  
Vol 18 (2) ◽  
pp. 43-54
Author(s):  
Anggi Suryani ◽  
Sri Hartati Dewi ◽  
Harmiyati Harmiyati

[ID] Penggunaan konstruksi beton diminati karena beton memiliki sifat-sifat yang menguntungkan seperti ketahanannya terhadap api, awet, kuat tekan yang tinggi dan dalam pelaksanaannya mudah untuk dibentuk sesuai dengan bentuk yang dikehendaki. Tetapi konstruksi beton juga mempunyai kelemahan-kelemahan antara lain kemampuan menahan kuat lentur yang rendah sehingga konstruksinya mudah retak jika mendapatkan regangan lentur. Hal ini menjadikan pengujian kuat lentur beton sebagai persyaratan dalam penerimaan hasil pekerjaan. Namun disisi lain dalam hal pembuatan campuran beton yang selama ini mengacu pada kuat tekan, menjadi tantangan bagi pelaksana yang harus melakukan perencanaan beton (mix design) dan trial mix terlebih dahulu, sehingga perlu dilakukan pengkoreksian. Sehingga penelitian ini bermaksud untuk memperoleh hasil kuat lentur dan kuat tekan beton dengan menghasilkan nilai korelasi kuat lentur beton terhadap kuat tekan beton sesuai kuat lentur dan kuat tekan yang direncanakan maupun disyaratkan. Penelitian ini menggunakan metode Departemen of Environment (DoE) dalam SNI 03-2834-2000 untuk mix design beton. Perencanaan mutu beton K-500 dan kuat lentur rencana fs = 45 kg/ (4,4 MPa) dengan penggunaan bahan tambah superplaticizer 0,5% merk TanCem 20 RA dengan benda uji balok, silinder, dan kubus, dengan slump rencana 30-60 mm. hasil penelitian bahwa pada perawatan 14 dan 28 hari diperoleh hasil pengaruh terhadap beton tanpa superplaticizer 0,5% dengan beton penggunaan bahan tambahan superplaticizer 0,5% terjadi peningkatan pada perawatan 14 hari dengan benda uji balok sebesar 3,26% dan kubus sebesar 22,25%. Peningkatan pada perawatan 28 hari benda uji balok sebesar 3,36%, silinder sebesar 8,09% dan kubus sebesar 7,56%. Terjadi penurunan pada perawatan 14 hari dengan benda uji silinder sebesar 3,21%. Hasil korelasi kuat lentur dengan kuat tekan beton benda uji balok dan silinder, dari hasil mendapatkan nilai korelasi pada perawatan 14 hari tanpa dan dengan tambahan zat addiktif superplaticizer 0,5% didapat persamaan bahwa fs = K√f'c : nilai K sebesar 0,96 dan 0,87, sedangkan pada perawatan 28 hari tanpa dan dengan tambahan zat addiktif superplaticizer 0,5% didapat persamaan bahwa fs = K√f'c : nilai K sebesar 0,86 dan 0,99, maka dapat disimpulkan dari hasil penelitian ini nilai korelasi kuat lentur beton dengan kuat tekan beton bahwa berhubungan sangat kuat yang mana nilai koefisien korelasi di antara 0,80 sampai 1,00. [EN] The use of concrete construction is desirable because concrete has beneficial properties such as resistance to fire, durability, high compressive strength and in its implementation it is easy to be formed in accordance with the desired shape. But concrete construction also has weaknesses such as the ability to hold low flexural strength so that the construction is easily cracked if it gets a flexible strain. This makes testing the flexural strength of concrete as a requirement in receiving work results. But on the other hand in terms of making concrete mixes which have been referring to compressive strength, it is a challenge for implementers who have to do concrete planning (mix design) and trial mix first, so correction is necessary. So that this study intends to obtain the results of flexural strength and compressive strength of concrete by producing a correlation value of the flexural strength of the concrete to the compressive strength of the concrete according to the flexural strength and compressive strength planned or required. This study uses the Department of Environment (DoE) method in SNI 03-2834-2000 for concrete mix design. Planning the quality of K-500 concrete and planned flexural strength fs = 45 kg / cm ^ 2 (4.4 MPa) with the use of added ingredients 0.5% superplaticizer TanCem 20 RA brands with beam specimens, cylinders and cubes, with slump plans 30-60 mm. The results of the study showed that the treatment of 14 and 28 days obtained the effect of concrete without a 0.5% superplaticizer with concrete using 0.5% superplaticizer was increased in 14 days treatment with beam specimens of 3.26% and cube of 22, 25%. The increase in the 28-day treatment of beam specimens was 3.36%, cylinders were 8.09% and cubes were 7.56%. There was a decrease in 14-day treatment with cylindrical specimens of 3.21%. The results of the correlation of flexural strength with concrete compressive strength of beam and cylinder specimens, from the results of obtaining a correlation value on treatment 14 days without and with additional additives 0.5% superplaticizer obtained the equation that fs = K√f'c: K value of 0 96 and 0.87, while the 28-day treatment without and with additional additives of 0.5% superplaticizer obtained the equation that fs = K√f'c: K value of 0.86 and 0.99, it can be concluded from the results of the study This correlation value of concrete flexural strength with concrete compressive strength is very strongly related where the correlation coefficient value is between 0.80 to 1.00.


2020 ◽  
Vol 21 ◽  
pp. 31-37
Author(s):  
Ali Abdulhasan Khalaf ◽  
Katalin Kopecskó

The research aims to determine the best combination of the controlling factors that govern geopolymer concrete’s mechanical and physical properties by utilizing industrial waste. Therefore, a review on the controlling factors was conducted. Firstly, it is to identify the controlling factors, namely chemical composition, alkali activation solution, water content, and curing condition. Secondly, understanding the relationship between these controlling factors and the properties of geopolymer concrete. These factors are analysed to the mix proportion components. Finally, a new proportion method is proposed based on combining ACI 211 standard and recommended molar ratios of oxides involved in geopolymer synthesis. The effect of aggregate has been taken into account by applying the absolute volume method in mix design. Based on the results of the study, it is expected to determine the optimal mix proportions based on multi-responses.


Teras Jurnal ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 53
Author(s):  
Yudi Pranoto ◽  
Lina Halim ◽  
Anung Sudibyo

<p align="center"><strong>Abstrak</strong></p><p> </p><p class="11daftarpustaka">Serat abaka merupakan serat yang awet dan lentur yang diambil dari pohon pisang. Serat ini masih sangat jarang dimanfaatkan, sementara di Indonesia serat abaka bisa ditemukan di mana mana. Tujuan penelitian ini adalah untuk mengetahui sejauh mana pengaruh serat abaka terhadap kuat lentur beton. Penelitian ini diawali dengan studi literature, pengujian material (Agregat halus, agregat kasar, semen dan serat abaka), mix design beton, pembuatan benda uji, perawatan dan dilanjutkan dengan pengujian kuat lentur beton serta terakhir dilakukan analisis hasil pengujian. Dari hasil pengujian didapatkan kuat lentur maksmum terjadi pada kadar serat abaka sebesar 0,6% dengan kuat lentur 3,75 MPa, sedangkan kuat lentur terkecil terjadi pada kadar serat abaka 0% dengan kuat lentur 3,34 MPa.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Kata kunci: <em>serat abaka,</em><em> kuat lentur, mix deisgn</em><em></em></p><p align="center"><strong> </strong></p><p align="center"><strong> </strong></p><p align="center"><strong>Abstract</strong></p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Abaca fiber is a durable and flexible fiber taken from the banana tree. This fiber is still very rarely used, while in Indonesian abaca fiber can be found everywhere. The purpose of this study was to determine the extent of the influence of abaca fiber on the flexural strength of concrete. This research begins with literature studies, material testing (fine aggregate, coarse aggregate, cement, and abaca fiber), concrete mix design, manufacture of test objects, curing, and continues with concretes flexural strength testing and finally an analysis of the test results. From the test results, it founded that the maximum flexural strength occurred at the abaca fiber content of 0.6% with a bending strength of 3.75 MPa, and the smallest flexural strength occurred at 0% abaca fiber content with a flexural strength of 3.34 MPa.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Keywords: <em>Abaka fiber,</em><em> flexural strength, mix design</em><em></em></p>


2013 ◽  
Vol 721 ◽  
pp. 420-424
Author(s):  
Guo Ju Ke ◽  
Bo Tian ◽  
Ji Liang Wang

The paper presents a new concept of ultra-filled by studying of classical aggregate filling theory. To resolve the problem involved in mix design with ultra-filled theory, a mix proportion design method of manufactured sand cement concrete is established. By calculation and test, the paper works out the rich plasma factor K1 and K2 of pavement manufactured cement concrete and the experimental result shows that the method is feasible and reasonable.


2014 ◽  
Vol 926-930 ◽  
pp. 645-648 ◽  
Author(s):  
Xu Rong Li ◽  
Hong Guang Ji ◽  
Jun Wang ◽  
Cheng Lin Song

In order to study the strength change of high strength concrete shaft lining structure in underground complex environment resisting composite salt damage erosion, C70 high strength concrete test specimens were made and composite salt disaster solutions of different concentrations were compounded. The test results show that the coefficient of compressive strength and flexural strength of high strength concrete increase in early corrosion and then decline. The strength of specimen declines more quickly in higher corrosion solution concentration in latter time. The change law of the flexural strength is more complex than the compressive strength. Composite salt disaster solutions have little effect for no damage high strength concrete.


2011 ◽  
Vol 391-392 ◽  
pp. 161-164
Author(s):  
Tie Quan Ni ◽  
Chang Jun Ke ◽  
Li Zhang

According to the particularity of the autoclaved cement concrete that partial aggregate could participate in hydration reaction in the process of autoclaving, the optimal gradation of coarse aggregate and the optimal slurry aggregate ratio is studied, and the effect of water reducing agent for fluidity of cement paste is also studied. The optimized mix design of autoclaved cement concrete based on high strength (compressive strength and flexural strength) is done by orthogonal test with four factors (water-binder ratio, type of mineral admixture, amount and sand ratio) and four levels.


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