scholarly journals Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3125
Author(s):  
Lavaniyah Sabapathy ◽  
Bashar S. Mohammed ◽  
Amin Al-Fakih ◽  
Mubarak Mohammed A Wahab ◽  
M. S. Liew ◽  
...  
Keyword(s):  
Weight Loss ◽  
Response Surface Methodology ◽  
Graphene Oxide ◽  
Response Surface ◽  
Length Change ◽  
Crumb Rubber ◽  
Cementitious Composite ◽  
Acid Attack ◽  
Engineered Cementitious Composite ◽  
Chemical Attack

The objective of this research was to determine the durability of an engineered cementitious composite (ECC) incorporating crumb rubber (CR) and graphene oxide (GO) with respect to resistance to acid and sulphate attacks. To obtain the mix designs used for this study, response surface methodology (RSM) was utilized, which yielded the composition of 13 mixes containing two variables (crumb rubber and graphene oxide). The crumb rubber had a percentage range of 0–10%, whereas the graphene oxide was tested in the range of 0.01–0.05% by volume. Three types of laboratory tests were used in this study, namely a compressive test, an acid attack test to study its durability against an acidic environment, and a sulphate attack test to examine the length change while exposed to a sulphate solution. Response surface methodology helped develop predictive responsive models and multiple objectives that aided in the optimization of results obtained from the experiments. Furthermore, a rubberized engineered cementitious composite incorporating graphene oxide yielded better chemical attack results compared to those of a normal rubberized engineered cementitious composite. In conclusion, nano-graphene in the form of graphene oxide has the ability to enhance the properties and overcome the limitations of crumb rubber incorporated into an engineered cementitious composite. The optimal mix was attained with 10% crumb rubber and 0.01 graphene oxide that achieved 43.6 MPa compressive strength, 29.4% weight loss, and 2.19% expansion. The addition of GO enhances the performance of rubberized ECC, contributing to less weight loss due to the deterioration of acidic media on the ECC. It also contributes to better resistance to changes in the length of the rubberized ECC samples.

Chemical attack on concrete containing a high volume of crumb rubber as a partial replacement to fine aggregate in engineered cementitious composite (ECC)

2021 ◽  
Author(s):  
Wesam Salah Alaloul ◽  
Muhammad Ali Musarat ◽  
Sani Haruna ◽  
Bassam Tayeh ◽  
Muhammad Nurzahin Bin Norizan
Keyword(s):  
Compressive Strength ◽  
High Volume ◽  
Crumb Rubber ◽  
Cementitious Materials ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Cementitious Composite ◽  
Conventional Concrete ◽  
Engineered Cementitious Composite ◽  
Chemical Attack

This research has been conducted where the focus is on the chemical attack towards the Engineered Cementitious Composite (ECC) containing a high volume of the crumb rubber in terms of durability, behaviour, and comparison with conventional concrete. Two variables have been considered in developing rubberized ECC mixtures, i.e. the amount of crumb rubber as a replacement to fine aggregate by volume of 0-30% and PVA fibres by volume of 0-2% to cementitious materials. The resistance properties of ECC incorporating crumb rubber were investigated for 13 different variable combinations developed by Response Surface Methodology (RSM). The experimental results revealed that the presence of crumb rubber in the ECC matrix enhanced the resistance of the ECC in both acidic and sulphate environments. It was also revealed that by incorporating 15% of crumb rubber, the loss of compressive strength significantly reduced from 38% to 15%

scholarly journals Modelling and Optimization of the Impact Resistance of Graphene Oxide Modified Crumb Rubber-ECC Using Response Surface Methodology

2021 ◽  
Vol 1197 (1) ◽  
pp. 012043
Author(s):  
Isyaka Abdulkadir ◽  
Bashar S. Mohammed ◽  
M. S. Liew ◽  
M. M. A. Wahab
Keyword(s):  
Response Surface Methodology ◽  
Graphene Oxide ◽  
Response Surface ◽  
Predictive Models ◽  
Impact Resistance ◽  
Crumb Rubber ◽  
Test Method ◽  
Fine Aggregate ◽  
The Impact

Abstract This paper presents the findings of an investigation on the impact resistance of graphene oxide (GO) modified rubberized engineered cementitious composite (GOCRECC) and the development of response-predictive models and optimization using response surface methodology (RSM). The input factors considered as the independent variables were the GO at 0, 0.02, 0.04, 0.06 and 0.08% addition by cement weight and crumb rubber (CR) at 1, 3 and 5% replacement of fine aggregate. Fifteen mixes having different quantities of input factors were used for the determination of the initial (E1) and ultimate (E2) impact energy using the ACI 544. R drop weight impact test method. The results showed that impact resistance of the GOCRECC mixes increased with increasing contents of the input factors. Response predictive models for E1 and E2 were developed and found to have high R2 values of 78 and 93% respectively, after validation using the analysis of variance (ANOVA). The optimization performed yielded an optimal amounts of the input factors of 0.0347 and 5% for GO and CR respectively at a desirability value of 74%.

scholarly journals Combination of optimization techniques to find of processing optimal condition of postharvest broccoli by vacuum cooling process

2018 ◽  
Vol 40 (1) ◽  
pp. 36222 ◽  
Author(s):  
Tian Ding ◽  
Charles Gobber ◽  
José Carlos Curvelo Santana ◽  
Wonder Alexandre Luz Alves ◽  
Sidnei Alves de Araújo ◽  
...  
Keyword(s):  
Weight Loss ◽  
Response Surface Methodology ◽  
Tabu Search ◽  
Optimal Condition ◽  
Response Surface ◽  
Search Algorithm ◽  
Optimization Techniques ◽  
Water Volume ◽  
Tabu Search Algorithm ◽  
Vacuum Cooling

This study aimed to investigate the impact of each factor on the weight loss of postharvest broccoli and treatment efficacy, and also attempted to fix the optimal condition for vacuum cooling treatment on postharvest broccoli by response surface methodology combined with tabu search techniques. Fresh broccoli samples were harvested from a Chinese farm and the green heads of selected samples were cut into smaller ones with approximately 3~4 cmdiameter, and sequentially equilibrated to room temperature. Pressure (200-600 Pa), broccoli weight (200-500 g), water volume (2-6 %, v v-1) and time (20-40 min) were used as factors and weight loss, final temperature and cost as responses. A tabu search algorithm was developed to find the optimum condition for processing broccoli and its initial condition were from response surface methodology. Results demonstrates a good adjust of tabu search algorithm in simulation of the broccoli freezing process. From tabu list the best condition were found as follows: the broccoli weight between 273.5 and 278.0 g with a water volume of 3.0%, processed for 40.0 min and at 200 Pa, where the weight loss was 0.34 ± 0.01%, of end temperature was 2.0 ± 0.0°C and profit percent was 99.66 ± 0.01%. 

scholarly journals Response surface methodology as a powerful tool to optimize the synthesis of polymer-based graphene oxide nanocomposites for simultaneous removal of cationic and anionic heavy metal contaminants

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18480-18490 ◽  
Author(s):  
Jem Valerie D. Perez ◽  
Enrico T. Nadres ◽  
Hang Ngoc Nguyen ◽  
Maria Lourdes P. Dalida ◽  
Debora F. Rodrigues
Keyword(s):  
Heavy Metal ◽  
Response Surface Methodology ◽  
Graphene Oxide ◽  
Response Surface ◽  
Simultaneous Removal ◽  
Metal Contaminants ◽  
Heavy Metal Contaminants

Nanocomposites containing graphene oxide (GO), polyethyleneimine (PEI), and chitosan (CS) were synthesized for chromium(vi) and copper(ii) removal from water.

Sign in / Sign up

Export Citation Format

Share Document