The effect of manufacturing defects on compressive strength of ultralight hollow microlattices: A data-driven study

2018 ◽  
Vol 19 ◽  
pp. 51-61 ◽  
Author(s):  
L. Salari-Sharif ◽  
S.W. Godfrey ◽  
M. Tootkaboni ◽  
L. Valdevit
2019 ◽  
Vol 1 (1) ◽  
pp. 113-118
Author(s):  
Nur Fikriah Hashim ◽  
Nuraqilah Mohd Zainal ◽  
Nurain Jamil ◽  
Nurul Nasuha Mohd Nor ◽  
Suriani Mat Jusoh

Nowadays, Kenaf fiber is sustainably useful in marine structures and has become one of the materials that may be high in demand as it is light, biodegradable and environmental friendly. This study investigates the effect of fiber percentage on compressive strength of fiber reinforced concrete (FRC) and the relationship between compressive strength and time of FRC immersion in seawater. FRC concrete cubes were prepared using four different percentage of fiber (0%, 1.5%, 3.0% and 4.5%). These FRC were immersed in seawater for 7, 14 and 21 days for three consecutive weeks. Based on the experiment, it was found that there was improvement in compressive strength of FRC when compared to plain cement concrete. The results showed that 3.0% of KF to cement matrix concrete determined the highest compressive strength of 205.43 Pa while 0% of KF fiber to cement concrete matrix (control specimen) showed the lowest compressive strength of 158.28 Pa. Also the addition of Kenaf fiber to cement concrete decreased the seawater absorption more than concrete with absolutely 0% of KF fiber to cement concrete (control specimen). In conclusion, the results did show significant improvement and a consistent trend on strength with the addition of FRC. This study also revealed that the percentage of water absorption was on the increase for 0, 7 and 14 days and become constant after day 21. This is due to manufacturing defects that occurred which block the water from entering the material and making the material absorb less water.


2022 ◽  
Vol 318 ◽  
pp. 125944
Author(s):  
Emadaldin Mohammadi Golafshani ◽  
Mehrdad Arashpour ◽  
Ali Behnood

Author(s):  
В.Х. Хадисов ◽  
А.З. Абуханов ◽  
М.Р. Хаджиев

Данная работа посвящена решению актуальной проблемы утилизации техногенных сырьевых ресурсов в виде керамического кирпичного боя и производственного брака с получением вторичного мелкого и крупного заполнителя, для дальнейшего изготовления мелкоштучных изделий на основе керамобетона. Внедрение предлагаемой безотходной ресурсосберегающей технологии получения стеновых материалов позволит поддерживать экологическую безопасность окружающей среды. Отмечается специфика приготовления формовочных керамобетонных смесей, особенности формирования структуры исследуемых композиций. Приводятся рецептуры легких бетонов на основе керамического кирпичного заполнителя и результаты исследования свойств, необходимых для получения качественных и долговечных мелкоштучных материалов. Изучались такие свойства, как плотность, теплопроводность, морозостойкость и прочность на сжатие, так как именно к этим характеристикам предъявляются особые требования. Разработанные составы легких керамобетонов имели достаточно низкие показатели теплопроводности в пределах 0,490,98 Вт/ (мС), марка керамобетона по морозостойкости находилась в пределах от F50 до F100, плотность изменялась от 13001700кг/м3, значение предела прочности при сжатии достигало 41 МПа. Использование кирпичного боя в легких бетонах позволит снизить себестоимость продукции на 3035. This work is devoted to solving the problems associated with the use of manmade frequency resources in the form of ceramic bricks and manufacturing defects with the production of secondary small and large aggregates for the further manufacture of small piece products based on ceramicconcrete. The introduction of the proposed wastefree resourcesaving technology for wall materials allows you to maintain the environmental safety of the environment. The specifics of the preparation of molding ceramicconcrete mixtures, the features of the formation of the structure of the studied compositions are noted. Formulations of lightweight concrete based on ceramic brick aggregate and the results of the study of the properties necessary for obtaining highquality and durable smallpiece materials are given. Properties such as density, thermal conductivity, frost resistance and compressive strength have been studied, since it is these characteristics that have special requirements. The developed lightweight porcelain compositions had relatively low thermal conductivity in the range of 0.490.98 W / (m C), the grade of frost resistance by frost resistance ranged from F50 to F100, the density changed from 13001700 kg / m3, the value Compressive strength reached 41 MPa. The use of brick battle in lightweight concretes will reduce the cost of production by 3035.


Author(s):  
Funso Falade ◽  
Taim Iqbal

Compressive strength of concrete, renowned as one of the most substantial mechanical properties of concrete and key factors for the quality assurance of concrete. In the present study, two different data-driven models, i.e., Adaptive Neuro-Fuzzy Inference System (ANFIS), and Multiple Linear Regression (MLR) were used to predict the 28 days compressive strength of recycled aggregate concrete (RAC). 16 different input parameters, including both dimensional and non-dimensional parameters, were used for predicting the 28 days compressive strength of concrete. The present study established that estimation of 28 days compressive strength of recycled aggregate concrete was performed better by ANFIS in comparison to MLR. Besides, the performance of data-driven models with and without the non-dimensional parameters is explored. It was observed that the data-driven models show better accuracy when the non-dimensional parameters were used as additional input parameters. Furthermore, the effect of each non-dimensional parameter on the performance of each data-driven model is investigated and 28 days compressive strength of concrete is examined.


2016 ◽  
Vol 66 (324) ◽  
pp. 103 ◽  
Author(s):  
M. Fernández-Cánovas ◽  
M. N. González-García ◽  
J. Á. Piñero ◽  
A. Cobo

This behaviour of low- and medium-strength concrete specimens confined with carbon fibre-reinforced polymer (CFRP) was analysed in three loading cycles. In some cases, stress levels were achieved that produced intemal microcracks, which allowed residual rigidity and the behaviour of completely microcraked concrete specimens to be studied. The specimens were subsequently tested to compression to the fracture point. Specimens reinforced in accordance with no manufacturing defects (100% CFRP reinforcement) and major manufacturing defects (50% CFRP reinforcement) were assessed for effectiveness and behaviour of the confined elements in less than ideal conditions. Results show that confinement was higher in low-resistance concretes, that the behaviour of reinforced specimens was unaffected by defective implementation conditions and that the reinforced specimens were less rigid than the non-reinforced specimens when tested up to 40% of ultimate fracture strength.


2015 ◽  
Vol 5 (2) ◽  
pp. 16-23 ◽  
Author(s):  
Faezehossadat Khademi ◽  
◽  
Mahmoud Akbari ◽  
Sayed Mohammadmehdi Jamal ◽  
◽  
...  

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