Construction Considerations in the Field Application of the Superpave Mix Design System

2009 ◽  
pp. 186-186-15
Author(s):  
AS Noureldin
Keyword(s):  
Field Application ◽  
Mix Design ◽  
Design System

The Superpave Gradation Restricted Zone and Performance Testing With the Georgia Loaded Wheel Tester

1997 ◽  
Vol 1583 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Donald E. Watson ◽  
Andrew Johnson ◽  
David Jared
Keyword(s):  
High Performance ◽  
Performance Testing ◽  
Mix Design ◽  
Design System ◽  
Department Of Transportation ◽  
Natural Sand ◽  
Aggregate Gradation ◽  
Actual Field ◽  
And Performance ◽  
Highway Research

Guidelines for the new hot-mix asphalt design system, Superpave, were developed under the Strategic Highway Research Program. One of the most controversial components of this system is the aggregate gradation restricted zone. This restricted zone was adopted as a gradation specification primarily to deter the use of high levels of natural sand in high-performance mixes. By designing mixes with gradations that avoid the restricted zone (i.e., limit natural sand), the internal strength provided by internal friction could be improved. Some agencies question the validity of the restricted zone. The specified gradations of many current mixes contain bands that enter the restricted zone, but the mixes have performed well for years in actual field conditions. The Georgia Department of Transportation (GDOT) currently specifies several standard mixes with gradations that enter the restricted zone and still perform well. These high-performance mixes contain good quality, 100 percent manufactured aggregates and no natural sand. GDOT recommends that the Georgia loaded wheel tester or some other proof tester be incorporated into the mix design process to screen mixes before rejecting them solely because their combined gradation enters the restricted zone. If mixes having combined gradations that enter the restricted zone are categorically rejected, mixes that are economical for the purpose intended may be rejected in the process.

Minimum Voids in Mineral Aggregate in Hot-Mix Asphalt Based on Gradation and Volumetric Properties

1996 ◽  
Vol 1545 (1) ◽  
pp. 75-79 ◽  
Author(s):  
John A. Hinrichsen ◽  
John Heggen
Keyword(s):  
Hot Mix Asphalt ◽  
Heavy Traffic ◽  
Field Application ◽  
Mix Design ◽  
Volumetric Properties ◽  
Aggregate Gradation ◽  
Mineral Aggregate ◽  
Traffic Loads ◽  
Recent Developments ◽  
Asphalt Mix

The use of voids in mineral aggregate (VMA) criteria for proper mix design of hot-mix asphalt is a time-honored and fairly successful tool. Recent developments in the field of asphalt mix design have encouraged the use of mixtures with a coarse aggregate structure to resist the effect of heavy traffic loads. By using the equations presented, which account for both aggregate gradation and the volumetric properties of the materials, the mix designer is able to judge the proper VMA requirement for each unique blend of materials. By applying the new equations, the most economical mix may be selected without great risk of reduced durability. Supporting data from field application are presented to illustrate the use of the equations.

An Intelligent Concrete Mix Design System

1999 ◽  
Author(s):  
Aldo Dagnino
Keyword(s):  
Power Plants ◽  
Geographic Location ◽  
Cost Savings ◽  
Mix Design ◽  
Design System ◽  
Joint Research ◽  
Knowledge Based ◽  
Concrete Mix Design ◽  
Concrete Mix ◽  
Current Design

Abstract This paper describes the development and implementation of a computerized knowledge-based system (SmartMix) that provides assistance to concrete mix designers by automatically generating designs of concrete mixes. These concrete mixes can be used for the construction of power plants, buildings, bridges, etc. The generation of designs by SmartMix is based on current design practices and heuristic rules. SmartMix incorporates current empirical data and its knowledge base can be expanded to include data gathered in the future. SmartMix is a fully operational system and has been designed taking into account the existence of several concrete plants geographically distributed that produce concrete mixes. This is an important consideration because different materials will be available depending on the geographic location of a particular plant. The mix design provided by SmartMix addresses the specific requirements and characteristics of the concrete plant that is to produce it. SmartMix was built using a knowledge-based systems environment called Smart Elements from Neuron Data. The system’s domain expertise consists of heuristic knowledge, statistical information and intelligent objects. The system has improved the reliability and consistency of the new concrete mix designs and has reduced dramatically the time and cost associated with the design of concrete mixes with respect to the manual process. The development of SmartMix was completed in 1995 as a result of a Joint Research Venture project between Pildysh Engineering Inc. and the Alberta Research Council. SmartMix has been in use since the fall of 1995 and is currently being used by Pildysh Engineering Inc. as a primary tool for the design of concrete mixes. Substantial cost savings and quality improvement have been achieved as a result of the implementation of SmartMix.

Study on Application of Concrete Admixture Technology

2013 ◽  
Vol 438-439 ◽  
pp. 54-57
Author(s):  
Wen Cui
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Field Application ◽  
Hydration Heat ◽  
Mix Design ◽  
Shrinkage Stress ◽  
Simulation Test

Mix design of high performance concrete was determined based on the pumping simulation test. It was indicated by test and field application that the trimixture technique and the double mixture technique can improve the pump of concrete, reduce the dosage of cement and the hydration heat; adding expansion agent can prevent harmful cracks in the concrete due to shrinkage stress, improve the compactness and impermeability. The reasonable construction technologies were used in mixing, transportation, pouring, vibrating and curing of the concrete in order to ensure quality of the construction.

scholarly journals Software of concrete mix design system for constructions of railways

2013 ◽  
Vol 6 (1(14)) ◽  
pp. 38-40
Author(s):  
Иван Андреевич Михеев ◽  
Андрей Аркадьевич Плугин ◽  
Олег Анатольевич Калинин ◽  
Наталья Дмитриевна Сизова
Keyword(s):  
Mix Design ◽  
Design System ◽  
Concrete Mix Design ◽  
Concrete Mix

Tweaking the System: Modifications to the Superpave Mix Design System

2006 ◽  
Vol 3 (6) ◽  
pp. 13643
Author(s):  
RS McDaniel ◽  
K Hansen ◽  
DE Newcomb ◽  
DS Decker ◽  
SW Dean
Keyword(s):  
Mix Design ◽  
Design System

Development of Mix Design Criteria for 4.75-mm Superpave® Mixes

2003 ◽  
Vol 1819 (1) ◽  
pp. 125-133 ◽  
Author(s):  
Robert S. James ◽  
L. Allen Cooley ◽  
Shane Buchanan
Keyword(s):  
Surface Defects ◽  
The United States ◽  
Mix Design ◽  
Design System ◽  
Design Criteria ◽  
Void Content ◽  
Construction Time ◽  
Traffic Volumes ◽  
Air Void ◽  
Air Void Content

The Superpave® mix design system includes design criteria for a range of mixes with nominal maximum aggregate sizes (NMASs) between 9.5 and 37.5 mm. Many agencies in the United States have expressed an interest in using a 4.75-mm NMAS mix. Such a mix could provide benefits; that is, it should provide a very smooth riding surface, could be used for thin lift applications, could correct surface defects (leveling), could decrease construction time, could provide a use for manufactured screening stockpiles, and could provide a very economical surface mix for facilities with low traffic volumes. A study was done to establish the standard mix design criteria needed for 4.75-mm mixes. On the basis of the findings of the study, the recommended Superpave mix design criteria include a specified gradation control of 30% to 54% passing on the 1.18-mm (No. 16) sieve and 6% to 12% passing the 0.075-mm (No. 200) sieve. During design, the following were recommended: a design air void content of 4%, minimum voids in mineral aggregate (VMA) of 16% for all traffic levels, maximum VMA of 18% for mix designs with more than 75 gyrations, voids filled with asphalt (VFA) of 75% to 78% for mix designs with 75 gyrations and above, and VFA of 75% to 80% for mix designs with 50 gyrations. The results of the study showed that 4.75-mm NMAS mixes can be successfully designed. These types of mixes should provide economical mixes for low-volume roadways.

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