Superpave Mixture Design Method

2020 ◽  
pp. 301-318
Author(s):  
Ghazi G. Al-Khateeb
Keyword(s):  
Design Method ◽  
Mixture Design

scholarly journals Optimal Mixture Design of Low-CO2 High-Volume Slag Concrete Considering Climate Change and CO2 Uptake

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Han-Seung Lee ◽  
Seung-Min Lim ◽  
Xiao-Yong Wang
Keyword(s):  
Climate Change ◽  
Design Method ◽  
High Strength ◽  
High Volume ◽  
Mixture Design ◽  
Control Factor ◽  
Co2 Uptake ◽  
Uptake Ratio ◽  
Carbonation Depth ◽  
Low Co2

Abstract High-volume slag (HVS) can reduce the CO2 emissions of concrete, but increase the carbonation depth of concrete. In particular, because of the effects of climate change, carbonation will accelerate. However, the uptake of CO2 as a result of carbonation can mitigate the harm of CO2 emissions. This study proposes an optimal mixture design method of low-CO2 HVS concrete considering climate change, carbonation, and CO2 uptake. Firstly, net CO2 emissions are calculated by subtracting the CO2 emitted by the material from the uptake of CO2 by carbonation. The strength and depth of carbonation are evaluated by a comprehensive model based on hydration. Secondly, a genetic algorithm (GA) is used to find the optimal mixture. The objective function of the GA is net CO2 emissions. The constraints of the GA include the strength, carbonation, workability, and range of concrete components. Thirdly, the results show that carbonation durability is a control factor of the mixture design of low-strength HVS concrete, while strength is a control factor of the mixture design of high-strength HVS concrete. After considering climate change, the threshold of strength control increases. With the increase of strength, the net CO2 emissions increase, while the CO2 uptake ratio decreases.

Mixture design of concrete using simplex centroid design method

2018 ◽  
Vol 89 ◽  
pp. 76-88 ◽  
Author(s):  
Dengwu Jiao ◽  
Caijun Shi ◽  
Qiang Yuan ◽  
Xiaopeng An ◽  
Yu Liu
Keyword(s):  
Design Method ◽  
Mixture Design

Cement Mortar with Nanosilica: Experiments with Mixture Design Method

2016 ◽  
Vol 113 (1) ◽  
Author(s):  
Mohamed Fattouh Abd El Hameed ◽  
Mariam Farouk Ghazy ◽  
Metwally Abd Allah Abd Elaty
Keyword(s):  
Cement Mortar ◽  
Design Method ◽  
Mixture Design

Updating Satisfaction Curve of Concrete Material by Bayesian Method

2013 ◽  
Vol 753-755 ◽  
pp. 564-567
Author(s):  
Ling Zhao ◽  
Guang Jun Zhang ◽  
Bai Sui Zhang ◽  
Wan Wen Wang
Keyword(s):  
Relationship Satisfaction ◽  
Bayesian Method ◽  
Systematic Approach ◽  
Design Method ◽  
Mixture Design ◽  
Performance Based Design ◽  
Next Generation ◽  
Flexible Design ◽  
Concrete Material ◽  
Criterion Level

Performance Based Design (PBD) is being developed as a more reasonable and flexible design method for a next generation of design method. To implement PBD, this paper presents a systematic approach (Bayesian method) for developing concrete material mixture design to satisfaction criterion level relationship. Satisfaction curves describe the probability of concrete reaching or exceeding different criterion level at specified levels of concrete material.

scholarly journals FORMULATION, OPTIMIZATION AND CHARACTERIZATION OF IBUPROFEN LOADED MICROEMULSION SYSTEM USING D-OPTIMAL MIXTURE DESIGN

2019 ◽  
pp. 304-312 ◽  
Author(s):  
YASSIR EL ALAOUI ◽  
AICHA FAHRY ◽  
YOUNES RAHALI ◽  
NAWAL CHERKAOUI ◽  
YAHYA BENSOUDA ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Zeta Potential ◽  
Phase Diagrams ◽  
Ternary Phase ◽  
Design Method ◽  
Mixture Design ◽  
Microemulsion System ◽  
Polyethylene Glycol 400 ◽  
Ternary Phase Diagrams ◽  
Globule Size

Objective: The purpose of this study was to develop, optimize and characterize a stable microemulsion, with an improvement of the solubility of a poorly aqueous soluble drug, ibuprofen. Methods: Various oils (oleic acid, cottonseed oil, olive oil, argan oil, and labrafac® WL 1349), surfactants (tween® 80, tween® 40, tween® 20) and co-surfactants including polyethylene glycol 400, ethanol, 1-butanol, and propylene glycol were selected after solubility studies. Then, pseudo-ternary phase diagrams with surfactant/co-surfactant ratio of 1:2, 1:1, 2:1 and 3:1 were constructed and a D-optimal mixture design method was used to optimize the ibuprofen loaded microemulsion. The optimized microemulsion was evaluated for several characteristics including globule size, zeta potential, pH, conductivity, refractive index and stability studies. Results: Optimized microemulsion obtained was composed of oleic acid (6.88% w/w), tween® 80/1-butanol (3:1, 63.11% w/w) and water (30.00% w/w). The results obtained showed an average globule size of 117.5 nm, a zeta potential of-6.47 mV and a transmittance of 96.95±0.77%. The optimized formulation showed an improvement in the solubility of ibuprofen with unchanged characteristics for one month. Conclusion: The use of pseudo-ternary phase diagrams and mathematical modeling allows to obtain an optimal microemulsion with perfect stability for 1 mo and a better solubilization capacity of ibuprofen.

Parent Asphalt Mixture Design of Semi-Flexible Pavement Based on Method of Main Mineral Aggregate Void Filling

2012 ◽  
Vol 446-449 ◽  
pp. 2599-2602 ◽  
Author(s):  
Guo Liang Yang ◽  
Kuang Huai Wu ◽  
Wei Ming Wang ◽  
Fan Bing Meng ◽  
Yan Feng Li ◽  
...  
Keyword(s):  
Design Method ◽  
Asphalt Mixture ◽  
Flexible Pavement ◽  
Mixture Design ◽  
Material Composition ◽  
Mineral Aggregate ◽  
Technical Performance ◽  
Technical Requirements ◽  
Void Structure ◽  
Volume Characteristics

Semi-flexible pavement was a type of pavements in good service performance and its material composition belonged to dense-skeleton structure. However, the material composition of its parent asphalt mixture was a form of skeleton-void structure. In order to achieve better volume characteristics and technical performance of parent asphalt mixture, the parent asphalt mixture design method of semi-flexible pavement based on main mineral aggregate void filling was developed. The parent asphalt mixture was studied using Marshall test and the results indicated that all volume parameters and technical performance indicators of parent asphalt mixture completely satisfied the corresponding technical requirements. The effectiveness of method of main mineral aggregate void filling to design parent asphalt mixture was verified.

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