Investigation of Hydration Features of the Special Concrete with Aggregates of Various Metal Particles

This study presents an analysis of various size metal particle waste (MP) influences on Portland cement (PC) paste hydration course, concrete sample structure densification during hardening and physical-mechanical properties. Investigations have shown that MP filler accelerates maximum heat release rate in PC pastes. MP intensifies structure development in the early phase, but slows it down in later PC hydration period. After 28-days of hardening the compressive strength of the concrete samples without MP filler is about 20% higher than of samples with MP. When in concrete composition microsilica and MP fillers are used together, compressive strength of concrete sample composition is up to 50% higher than of samples with MP filler only.

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STUDI EXPERIMEN KUAT TEKAN BETON DENGAN MEMANFAATKAN LIMBAH KERAMIK DAN BATA MERAH

Jurnal Manajemen Teknologi & Teknik Sipil ◽

10.30737/jurmateks.v2i1.394 ◽

2019 ◽

Vol 2 (1) ◽

pp. 86

Author(s):

Satria Febby Romaadhoni ◽

Ahmad Ridwan ◽

Sigit Winarto ◽

Agata Iwan Candra

Keyword(s):

Compressive Strength ◽

Concrete Sample ◽

Ceramic Surface ◽

Normal Concrete ◽

Compressive Strength Of Concrete

Normal concrete sample (1) has a compressive strength of 222.22 kg/cm, normal concrete (2) has a compressive strength of 242.933 kg/cm, concrete using a mixture of ceramic 21% and red brick 7% sample (1) has a compressive strength of 177.911 kg/cm, concrete using a mixture of 21% Ceramics and red brick 7% sample (2) has a compressive strength of 189.777 kg/cm, concrete using a mixture of 10% Ceramics and red brick 4% sample (1) has a compressive strength of 204.667 kg/cm, concrete which uses a mixture of 10% Ceramics and red brick 4% sample (2) has a compressive strength of 137,333 kg/cm. It shows that the compressive strength of concrete decreases from increasing the volume of ceramics because the ceramic surface cannot bind perfectly. The highest K-204,667 with a mixture of 10% ceramics and 4% red brick and 28-day-old concrete, while to reach the K-250, is very far away. Of the 6 samples, the average reached K-195,807.Sampel beton normal (1) memiliki kuat tekan 222,22 kg / cm, beton normal (2) memiliki kuat tekan 242.933 kg / cm, sampel beton menggunakan campuran keramik 21% dan bata merah sampel 7% (1) memiliki kuat tekan 177.911 kg / cm, sampel beton menggunakan campuran keramik 21% dan bata merah 7% (2) memiliki kuat tekan 189.777 kg / cm, sampel beton campuran 10% Keramik dan bata merah 4% (1) kuat tekan 204.667 kg / cm, sampel beton yang menggunakan campuran Keramik 10% dan sampel bata merah 4% (2) memiliki kuat tekan 137.333 kg / cm. Ini menunjukkan bahwa Kuat tekan beton semakin berkurang dari bertambahnya volume keramik, karena permukaan keramik tidak bisa mengikat dengan sempurna. K-204.667 tertinggi dengan campuran 10% keramik dan 4% bata merah serta beton berumur 28 hari, sedangkan untuk mencapai K-250 sangat jauh jauh. Dari 6 sampel tersebut rata-rata mencapai K-195.807.

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Effect of Nano Silica on Compressive Strength of Concrete

Volume 12: Materials: Genetics to Structures ◽

10.1115/imece2018-87799 ◽

2018 ◽

Author(s):

Wail Al-Rifaie ◽

Abdalmjeed Alawaneh ◽

Mohammed Al-Bajawi ◽

Waleed Ahmed

Keyword(s):

Compressive Strength ◽

Silica Fume ◽

Concrete Sample ◽

Mixing Ratio ◽

Nano Silica ◽

Concrete Construction ◽

Compressive Strength Of Concrete

In the present work, the use of nano silica fume in developing a compressive strength of concrete that can lead to improvement in concrete construction is carried out in the present work. One of the parameters considered is a number of curing days for measuring the compressive strength. The measured results demonstrate the increase in compressive. To achieve our goals, concrete cubes were cast and tested for compressive strength, all concrete sample has the same mixing ratio and sub-classified to standard, and Silica fume added by weight of cement (5%, 10%, 15%, 20% and 30%). The results show that the recommended addition was 15% of Silica fumes for optimum compressive strength that reaches 74.8 MPa.

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

Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan ◽

10.32492/jintake.v9i2.776 ◽

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%.

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Determination of Concrete Cube Strength from Used Samples / Určení Krychelné Pevnosti Betonu U Použitých Zkušebních Trámců

Transactions of the VŠB - Technical University of Ostrava Civil Engineering Series ◽

10.2478/v10160-012-0033-3 ◽

2012 ◽

Vol 12 (2) ◽

pp. 186-194 ◽

Cited By ~ 2

Author(s):

Oldřich Sucharda ◽

David Mikolášek ◽

Jiří Brožovský

Keyword(s):

Compressive Strength ◽

Concrete Beams ◽

Linear Analysis ◽

Bending Tests ◽

Cube Strength ◽

Non Linear ◽

Compressive Strength Of Concrete ◽

Concrete Cube

Abstract This paper deals with the determination of compressive strength of concrete. Cubes, cylinders and re-used test beams were tested. The concrete beams were first subjected to three-point or fourpoint bending tests and then used for determination of the compressive strength of concrete. Some concrete beams were reinforced, while others had no reinforcement. Accuracy of the experiments and calculations was verified in a non-linear analysis.

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Risk Analysis of Road Tunnels: A Computational Fluid Dynamic Model for Assessing the Effects of Natural Ventilation

Applied Sciences ◽

10.3390/app11010032 ◽

2020 ◽

Vol 11 (1) ◽

pp. 32

Author(s):

Ciro Caliendo ◽

Gianluca Genovese ◽

Isidoro Russo

Keyword(s):

Natural Ventilation ◽

Fluid Dynamic ◽

Movement Time ◽

Radiant Heat ◽

Heat Fluxes ◽

Maximum Heat ◽

Road Tunnels ◽

Maximum Heat Release ◽

Computational Fluid Dynamics Cfd ◽

Time Required

We have developed an appropriate Computational Fluid Dynamics (CFD) model for assessing the exposure to risk of tunnel users during their evacuation process in the event of fire. The effects on escaping users, which can be caused by fire from different types of vehicles located in various longitudinal positions within a one-way tunnel with natural ventilation only and length less than 1 km are shown. Simulated fires, in terms of maximum Heat Release Rate (HRR) are: 8, 30, 50, and 100 MW for two cars, a bus, and two types of Heavy Goods Vehicles (HGVs), respectively. With reference to environmental conditions (i.e., temperatures, radiant heat fluxes, visibility distances, and CO and CO2 concentrations) along the evacuation path, the results prove that these are always within the limits acceptable for user safety. The exposure to toxic gases and heat also confirms that the tunnel users can safely evacuate. The evacuation time was found to be higher when fire was related to the bus, which is due to a major pre-movement time required for leaving the vehicle. The findings show that mechanical ventilation is not necessary in the case of the tunnel investigated. It is to be emphasized that our modeling might represent a reference in investigating the effects of natural ventilation in tunnels.

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Towards Sustainable Concrete Composites through Waste Valorisation of Plastic Food Trays as Low-Cost Fibrous Materials

Sustainability ◽

10.3390/su13042073 ◽

2021 ◽

Vol 13 (4) ◽

pp. 2073 ◽

Cited By ~ 1

Author(s):

Hossein Mohammadhosseini ◽

Rayed Alyousef ◽

Mahmood Md. Tahir

Keyword(s):

Compressive Strength ◽

Low Cost ◽

Impact Resistance ◽

Food Tray ◽

World Population ◽

Fibrous Materials ◽

Palm Oil Fuel Ash ◽

Waste Plastic ◽

Compressive Strength Of Concrete ◽

The Impact

Recycling of waste plastics is an essential phase towards cleaner production and circular economy. Plastics in different forms, which are non-biodegradable polymers, have become an indispensable ingredient of human life. The rapid growth of the world population has led to increased demand for commodity plastics such as food packaging. Therefore, to avert environment pollution with plastic wastes, sufficient management to recycle this waste is vital. In this study, experimental investigations and statistical analysis were conducted to assess the feasibility of polypropylene type of waste plastic food tray (WPFT) as fibrous materials on the mechanical and impact resistance of concrete composites. The WPFT fibres with a length of 20 mm were used at dosages of 0–1% in two groups of concrete with 100% ordinary Portland cement (OPC) and 30% palm oil fuel ash (POFA) as partial cement replacement. The results revealed that WPFT fibres had an adverse effect on the workability and compressive strength of concrete mixes. Despite a slight reduction in compressive strength of concrete mixtures, tensile and flexural strengths significantly enhanced up to 25% with the addition of WPFT fibres. The impact resistance and energy absorption values of concrete specimens reinforced with 1% WPFT fibres were found to be about 7.5 times higher than those of plain concrete mix. The utilisation of waste plastic food trays in the production of concrete makes it low-cost and aids in decreasing waste discarding harms. The development of new construction materials using WPFT is significant to the environment and construction industry.

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