Study on polyurethane foamed concrete for use in structural applications

Harith, Iman Kattoof

doi:10.1016/j.cscm.2017.11.005

Cited by 48 publications

(27 citation statements)

References 5 publications

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“…Foamed concrete is considered an alternative to NWC due to its lightweight and insulating properties. Foamed concrete, also known as cellular concrete, is a lightweight concrete which contains at least 20% air by volume [6]. Homogenous pore voids, which help in controlling the density of foamed concrete, are developed by the inclusion of air using the foaming agent [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Palm Oil Fuel Ash and Egg shell Powder as Supplementary Cementitious Materials in Sustainable Foamed Concrete

et al. 2020

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The release of carbon dioxide (CO2) during the production of cement and the increase in waste generation has allowed the construction to focus on sustainability by replacing cement with agricultural waste resources such as Palm Oil Fuel Ash (POFA) and Eggshell Powder (ESP). This experimental study focuses on developing sustainable foamed concrete incorporating high content of POFA and ESP as cement replacement with the aim of cement conversion, reduction in natural resources depletion, reduction of CO2 emissions and cleaner production. Cement was replaced using 30 and 35% POFA and 5 to 15% ESP by weight of cement. It was observed that the flowability decreased with the increase in the content of POFA and ESP; this is due to their ability to absorb water. It was also observed that 40% cement replacement achieved satisfactory compressive strength while the tensile stress loss was significant. This study confirmed that recycling and reusing of POFA and ESP are possible in foamed concrete which could be used for non-structural applications.

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Section: Introductionmentioning

confidence: 99%

Incorporation of Palm Oil Fuel Ash and Egg shell Powder as Supplementary Cementitious Materials in Sustainable Foamed Concrete

et al. 2020

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“…On the contrary, several problems still exist that require further investigations, which can be listed as poor stability, low strength, higher shrinkage, easy cracking, and water absorption. In particular, the Compressive Strength (CS) of FC is often low and it is often difficult to reach 25 MPa in certain cases [12,15]. The CS of FC also depends on the composition or mixture from the constituents.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, various approaches to forecast the CS of FC have been investigated [3,6,[8][9][10]12,[14][15][16][17]. Numerous studies have also reported that the composition of the substances structure and their proportions greatly affect the CS of FC [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Investigation and Optimization of the C-ANN Structure in Predicting the Compressive Strength of Foamed Concrete

Dao

et al. 2020

Materials

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Development of Foamed Concrete (FC) and incessant increases in fabrication technology have paved the way for many promising civil engineering applications. Nevertheless, the design of FC requires a large number of experiments to determine the appropriate Compressive Strength (CS). Employment of machine learning algorithms to take advantage of the existing experiments database has been attempted, but model performance can still be improved. In this study, the performance of an Artificial Neural Network (ANN) was fully analyzed to predict the 28 days CS of FC. Monte Carlo simulations (MCS) were used to statistically analyze the convergence of the modeled results under the effect of random sampling strategies and the network structures selected. Various statistical measures such as Coefficient of Determination (R2), Mean Absolute Error (MAE), and Root Mean Squared Error (RMSE) were used for validation of model performance. The results show that ANN is a highly efficient predictor of the CS of FC, achieving a maximum R2 value of 0.976 on the training part and an R2 of 0.972 on the testing part, using the optimized C-ANN-[3–4–5–1] structure, which compares with previous published studies. In addition, a sensitivity analysis using Partial Dependence Plots (PDP) over 1000 MCS was also performed to interpret the relationship between the input parameters and 28 days CS of FC. Dry density was found as the variable with the highest impact to predict the CS of FC. The results presented could facilitate and enhance the use of C-ANN in other civil engineering-related problems.

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“…Rigid polyurethane (PUR) foam is one of the most popular products among polymeric foams used for biomedical applications [ 1 , 2 , 3 ]. PUR is a thermoset produced by polyaddition polymerization of diisocyanates and polyols [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurements of Mechanical Properties of PUR Foam Used for Testing Medical Devices and Instruments Depending on Temperature, Density and Strain Rate

et al. 2020

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Rigid polyurethane (PUR) foam is products used as a biomedical material for medical device testing. Thermal stability is a very important parameter for evaluating the feasibility of use for testing surgical instrument load during drilling. This work aimed to perform experimental measurements to determine the dependence of the mechanical properties of a certified PUR on temperature, strain rate and density. Experimental measurements were realised for three types of the PUR samples with different density 10, 25 and 40 pounds per cubic foot. The samples were characterised in terms of their mechanical properties evaluated from tensile and compression tests at temperatures of 25 °C, 90 °C and 155 °C. Furthermore, the structures of the samples were characterised using optical microscope, their thermal properties were characterised by thermogravimetric analysis, and their density and stiffness with the effect of temperature was monitored. The results show that it is optimal not only for mechanical testing but also for testing surgical instruments that generate heat during machining. On the basis of experimental measurements and evaluations of the obtained values, the tested materials are suitable for mechanical testing of medical devices. At the same time, this material is also suitable for testing surgical instruments that generate heat during machining.

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Study on polyurethane foamed concrete for use in structural applications

Cited by 48 publications

References 5 publications

Incorporation of Palm Oil Fuel Ash and Egg shell Powder as Supplementary Cementitious Materials in Sustainable Foamed Concrete

Incorporation of Palm Oil Fuel Ash and Egg shell Powder as Supplementary Cementitious Materials in Sustainable Foamed Concrete

Investigation and Optimization of the C-ANN Structure in Predicting the Compressive Strength of Foamed Concrete

Experimental Measurements of Mechanical Properties of PUR Foam Used for Testing Medical Devices and Instruments Depending on Temperature, Density and Strain Rate

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