GMA material design and construction quality control for asphalt pavement of steel box girder: Case study of the Hong Kong–Zhuhai–Macau Bridge

The asphalt pavement construction monitoring system presented in this paper covers two main asphalt pavement construction processes: hot mix asphalt (HMA) plant production and the laydown and compaction operation. The main architecture of the monitoring system, the development of the required hardware and the software structure, and the implementation process are presented in this paper. The system is able to perform automatic data collection and data transmission, and can automatically provide feedback to the construction site for real-time asphalt pavement construction quality control. The entire process works automatically without much human intervention and covers the entire project throughout the entire construction period in real time. The monitoring system was successfully implemented in the ZhaoMa Highway construction project in China, where it proved to be effective and reliable. The key asphalt plant production parameters, including asphalt content and aggregate gradation, were improved to a statistically significant level as shown by comparing before and after the monitoring system’s deployment. Statistical analysis between asphalt core density and laydown and compaction monitoring data, collected at 20 locations, indicated that rolling passes were highly correlated with density, whereas finishing rolling temperature and HMA laydown temperature were moderately correlated with density. These results imply that implementation of the monitoring system proposed by this paper could improve asphalt construction procedure quality control and asphalt pavement construction quality.

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Quality Control and Quality Assurance for Concrete Durability

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.711.76 ◽

2016 ◽

Vol 711 ◽

pp. 76-83 ◽

Cited By ~ 1

Author(s):

Odd E. Gjørv

Keyword(s):

Quality Control ◽

Quality Assurance ◽

Concrete Structures ◽

Numerical Approach ◽

Rational Approach ◽

Concrete Durability ◽

Construction Quality ◽

Concrete Construction ◽

Durability Design

The durability of concrete structures in severe environments is not only related to design and materials but also to construction. Thus, much of the observed durability problems can be ascribed due to lack of proper quality control and quality assurance during concrete construction resulting in poorly achieved construction quality. Upon completion of new concrete structures, the achieved construction quality typically shows a high scatter and variability, and during operation of the structures, any weaknesses and deficiencies will soon be revealed whatever durability specifications and materials have been applied. To a certain extent, a probability approach to the durability design can accommodate the high scatter and variability. However, a numerical approach alone is insufficient for ensuring the durability; greater control and improvements in durability also require the specification of performance-based durability requirements which can be verified and controlled during concrete construction in order to achieve quality assurance. For new major concrete infrastructure, documentation of achieved construction quality and compliance to the durability specification should be essential parts of any rational approach to controlling and increasing the durability. In the present paper, a case study is presented which provides comparisons of work performed under performance and prescriptive durability specifications.

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Design and Construction of the Cofferdam Pile with GFRP Reinforced Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.437 ◽

2013 ◽

Vol 671-674 ◽

pp. 437-440 ◽

Cited By ~ 1

Author(s):

Ming Lei Ma ◽

Gui Ling Wang ◽

Dong Mei Miao ◽

Bao Yu Lian

Keyword(s):

Weight Ratio ◽

Volume Ratio ◽

High Strength ◽

Material Design ◽

Fiber Volume ◽

Nanjing City ◽

Frp Reinforcement ◽

Railway Engineering ◽

Design And Construction

FRP (Fiber reinforced polymer) is a two-way designed material from both macro and micro design. Former design was carried out according to the structural design, and the micro design is the material design on fiber volume ratio and the resin types. FRP is eminent in civil engineering because of its high strength to weight ratio, durability prolongation, high stiffness to weight ratio and its fatigue resistance behaviors. Right now, lots of applications were found in offshore engineering, hydraulic engineering and railway engineering. This article focused on both design and construction of the FRP reinforcement with concrete, and a case study was provided from the Nanjing city by CCEED (China Construction Eighth Engineering Division).

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