Asphalt pavement macrotexture monitoring in cracked surfaces by using an acoustical low-cost continuous method

2021 ◽  
Vol 132 ◽  
pp. 103932
Author(s):  
Mohammad Reza Ganji ◽  
Ali Ghelmani ◽  
Amir Golroo ◽  
Hamid Sheikhzadeh
Keyword(s):  
Asphalt Pavement ◽  
Low Cost ◽  
Continuous Method

Test Study on Overdose Cement Stabilized Crushed Rock Base

2011 ◽  
Vol 415-417 ◽  
pp. 254-260 ◽  
Author(s):  
Yan Peng Lin ◽  
Jia Liu
Keyword(s):  
Asphalt Pavement ◽  
Low Cost ◽  
Base Material ◽  
Primary Stability ◽  
High Strength ◽  
Crushed Rock ◽  
Premature Failure ◽  
Soil Plasticity ◽  
The Road ◽  
Test Study

The early disease of semi-rigid asphalt pavement disease will seriously affect the quality and durability of road usage and the life of the road. Water into the pavement layer cause water content increases and the strength greatly reduced in primary or sub-base material which contends more soil and greater soil plasticity index. Resulting in premature failure of asphalt pavement, and the road surface rutting greater is the insufficient primary strength. The use of water overdose primary stability can fully play its high strength and low cost advantages, but also has a low shrinkage, minimize shrinkage cracks.

Research and Application Prospect on Cold Recycling Technology of Asphalt Pavement

2012 ◽  
Vol 204-208 ◽  
pp. 1909-1913 ◽  
Author(s):  
Ming Hui Liu
Keyword(s):  
Design Method ◽  
Asphalt Pavement ◽  
Low Cost ◽  
Detailed Comparison ◽  
Development Trend ◽  
Mixture Design ◽  
Recycling Technology ◽  
Comparison And Analysis ◽  
Cold Recycling ◽  
Important Design

Abstract. Cold recycling technology is applied to road rehabilitation in the recent years, and it has the advantages of mixture without heating, high RAP availability, low cost, quick speed of construction etc. Cold in-place recycling technology in this paper has been summarized including applied scope, cold recycling layer type, additives and new aggregates. We gives a detailed comparison and analysis to cold recycled mixture design method, and points out important design indexes. Combined with practical engineer of the technology in China, it analyzes application prospect and development trend on cold recycling technology.

scholarly journals An Improved Low-Cost Continuous Compaction Detection Method for the Construction of Asphalt Pavement

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tong Jia ◽  
Tiejun He ◽  
Zhendong Qian ◽  
Jian Lv ◽  
Kaixin Cao
Keyword(s):  
Detection Method ◽  
Detection System ◽  
Asphalt Pavement ◽  
Low Cost ◽  
Rolling Process ◽  
Continuous Compaction Control ◽  
Positioning Method ◽  
Compaction Control ◽  
Pavement Construction ◽  
Compaction Degree

To realize the continuous compaction control (CCC) of asphalt pavement during construction, continuous detection method was investigated for the compaction degree values. For the trajectory of rollers, a collaborative positioning method was proposed. For the monitoring of rolling process, an embedded-based detection system was designed. For the evaluation of rolling effect, harmonic analysis was introduced and a new index, vibration compaction energy value (VCVe), was proposed. Positioning experiments were conducted, and the accuracy was improved to 0.48 m. Rolling tests were performed, and typical compaction meter values (CMVs), compaction control values (CCVs), and VCVe were obtained. The referenced compaction degree by conventional way was 94.6%, which was used to calibrate the detected values of compaction degree indexes. The results showed that continuous compaction detection can be achieved based on positioning system and vibration analysis. Compared with CMV and CCV, VCVe is less discrete, more stable, and consistent to describe the compaction state. Though, all the CMV, CCV, and VCVe indexes are unable to be used for quality assurance directly or alone, they could be an aid for quality control. Continuous compaction detection system meets the monitoring requirements of pavement construction at a lower cost and could lay a foundation for the intelligent compaction (IC).

scholarly journals TECHNOLOGICAL AND ECONOMIC DESIGN OF ASPHALT MIXTURE COMPOSITION BASED ON OPTIMIZATION METHODS

2017 ◽  
Vol 23 (4) ◽  
pp. 627-648 ◽  
Author(s):  
Henrikas SIVILEVIČIUS ◽  
Kęstutis VISLAVIČIUS ◽  
Justas BRAŽIŪNAS
Keyword(s):  
Asphalt Pavement ◽  
Low Cost ◽  
Asphalt Mixture ◽  
Optimization Methods ◽  
Experimental Methods ◽  
Optimal Composition ◽  
Bitumen Content ◽  
Different Types ◽  
Programming Techniques ◽  
Technical Specifications

The asphalt pavement made of high quality materials and having the optimal composition best resists destructive effects of environmental factors and vehicles. The optimal content of the mineral materials of the asphalt mixture and a bituminous binder is selected employing calculation and experimental methods. The properties of the designed asphalt mixture must meet the requirements of technical specifications thus reducing its cost. The paper presents algorithms for simulating the composition of the asphalt mixture applying mathematical programming techniques. The algorithms allow designing the asphalt mixture with minimal bitumen content, a low cost of the mineral part and the densest gradation assessing technological requirements for producing the mixture. Optimal bitumen content is calculated considering bitumen capacities specified for different types of rock and determined employing the most recent standard sieves screening for narrow fractions. For verifying the new proposed algorithms, a numerical experiment on the materials most commonly used in asphalt mixing plants was done. The analysis of findings indicates that the application of the algorithms assist in comparing real results.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Chromic Acid Etching of Polyethylene

1973 ◽  
Vol 31 ◽  
pp. 72-73
Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard
Keyword(s):  
Chromic Acid ◽  
Low Cost ◽  
Acid Etching ◽  
Crystalline Morphology ◽  
Bulk Specimen ◽  
Morphological Studies ◽  
Perfect Form ◽  
Molecular Length ◽  
Lamellar Texture ◽  
Cost Studies

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.

Glass Knife Geometry as Seen by the SEM

1971 ◽  
Vol 29 ◽  
pp. 454-455
Author(s):  
J. Temple Black
Keyword(s):  
Low Cost ◽  
Amorphous Material ◽  
Stress Concentrations ◽  
Basic Tool ◽  
Tool Materials ◽  
Optical Inspection ◽  
Surface Flaws ◽  
Slip Planes ◽  
Glass Knife ◽  
Diamond Knife

In ultramicrotomy, the two basic tool materials are glass and diamond. Glass because of its low cost and ease of manufacture of the knife itself is still widely used despite the superiority of diamond knives in many applications. Both kinds of knives produce plastic deformation in the microtomed section due to the nature of the cutting process and microscopic chips in the edge of the knife. Because glass has no well defined slip planes in its structure (it's an amorphous material), it is very strong and essentially never fails in compression. However, surface flaws produce stress concentrations which reduce the strength of glass to 10,000 to 20,000 psi from its theoretical or flaw free values of 1 to 2 million psi. While the microchips in the edge of the glass or diamond knife are generally too small to be observed in the SEM, the second common type of defect can be identified. This is the striations (also termed the check marks or feathers) which are always present over the entire edge of a glass knife regardless of whether or not they are visable under optical inspection. These steps in the cutting edge can be observed in the SEM by proper preparation of carefully broken knives and orientation of the knife, with respect to the scanning beam.

Spectraplot: A PC-based spectrum translation and display program

1988 ◽  
Vol 46 ◽  
pp. 918-919
Author(s):  
H. O. Colijn
Keyword(s):  
Low Cost ◽  
Transfer Program ◽  
File Transfer ◽  
Transfer Data ◽  
Error Checking ◽  
Data Files ◽  
The University

Many labs today wish to transfer data between their EDS systems and their existing PCs and minicomputers. Our lab has implemented SpectraPlot, a low- cost PC-based system to allow offline examination and plotting of spectra. We adopted this system in order to make more efficient use of our microscopes and EDS consoles, to provide hardcopy output for an older EDS system, and to allow students to access their data after leaving the university.As shown in Fig. 1, we have three EDS systems (one of which is located in another building) which can store data on 8 inch RT-11 floppy disks. We transfer data from these systems to a DEC MINC computer using “SneakerNet”, which consists of putting on a pair of sneakers and running down the hall. We then use the Hermit file transfer program to download the data files with error checking from the MINC to the PC.

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