Erratum: Gradation, design, and cost consideration in blending aggregates for asphaltic concrete pavements

1985 ◽  
Vol 12 (3) ◽  
pp. 729-729
Author(s):  
Said M. Easa
Keyword(s):  
Concrete Pavements ◽  
Asphaltic Concrete ◽  
Cost Consideration

Gradation, design, and cost consideration in blending aggregates for asphaltic concrete pavements

1985 ◽  
Vol 12 (1) ◽  
pp. 82-93 ◽  
Author(s):  
Said M. Easa
Keyword(s):  
Specific Gravity ◽  
Minimum Cost ◽  
Plasticity Index ◽  
Feasible Region ◽  
Mean Deviation ◽  
Concrete Pavements ◽  
Asphaltic Concrete ◽  
Design Requirements ◽  
Automatic Elimination ◽  
Fineness Modulus

This paper presents an analytic (algorithmic) method for determining the optimum proportions of aggregates that satisfy specific gradation, design, and cost requirements of the blend. The gradation requirements include the specification limits and mean deviation from the midpoint of specifications limits. The design requirements include fineness modulus, plasticity index, and specific gravity. The optimum proportions may correspond to minimum mean deviation or minimum cost. In addition to providing the optimum solutions, the method provides the entire feasible region of proportions that may be useful if adjustments of proportions are deemed necessary.The paper first reviews existing aggregate blending methods, classifies them, and describes how the proposed method fits into that classification system. The method is then described along with its graphical interpretation. The method may be regarded as a simulation process and as such is not subjected to any type of constraints. Application of the method to a numerical aggregate blending problem was made to illustrate its use.While existing methods consider minimizing mean deviation (with no consideration of cost) or minimizing cost (with no consideration of mean deviation) the proposed method considers both mean deviation and cost as well as the physical properties. Other advantages of the method include adaptability to linear or stepwise cost functions of aggregates, automatic elimination of negative solutions, and provision for different weights (importance levels) of sieve specifications. Key words: blending, aggregate proportions, cost, mean deviation, gradation, specific gravity, plasticity index, fineness modulus, asphaltic concrete.

Effect of the Realistic Tire Contact Pressure on the Rutting Performance of Asphaltic Concrete Pavements

2018 ◽  
Vol 22 (6) ◽  
pp. 2138-2146 ◽  
Author(s):  
Sun-Myung Kim ◽  
Masoud K. Darabi ◽  
Dallas N. Little ◽  
Rashid K. Abu Al-Rub
Keyword(s):  
Contact Pressure ◽  
Concrete Pavements ◽  
Asphaltic Concrete

Minimum cost design of sulphur concrete pavements

1983 ◽  
Vol 10 (4) ◽  
pp. 649-653 ◽  
Author(s):  
R. E. Loov ◽  
J. E. Gillott ◽  
I. J. Jordaan ◽  
N. G. Shrive
Keyword(s):  
Portland Cement ◽  
Minimum Cost ◽  
Concrete Pavements ◽  
Asphaltic Concrete ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Soil Cement ◽  
Material Stiffness ◽  
Minimum Cost Design ◽  
Stiffness Characteristics

Two types of paving materials have traditionally been used for surfaces that must be better than can be provided by materials such as gravel or soil-cement. Portland-cement concrete has been designed based on procedures that recognize the rigid nature of this material. Asphaltic concrete has, on the other hand, been designed based on a recognition of the flexible nature of this material.We have found that, with minor differences in the amounts of suitable additives, sulphur concrete can be tailored to have different stiffness characteristics ranging between asphaltic concrete and Portland-cement concrete. With this material we have an opportunity therefore to choose the material stiffness that will result in the minimum pavement thickness for a given situation. The optimum material stiffness has been determined, based on different sub-base stiffnesses for standard wheel loads.The results of this investigation should be of interest to all engineers faced with the responsibility for designing pavements. Keywords: pavement, sulphur concrete, minimum cost design, highways.

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