Laboratory Evaluation on Resilient Modulus and Rate Dependencies of RAP Used as Unbound Base Material

2014 ◽  
Vol 26 (2) ◽  
pp. 379-383 ◽  
Author(s):  
Qiao Dong ◽  
Baoshan Huang
Keyword(s):  
Resilient Modulus ◽  
Base Material ◽  
Laboratory Evaluation

scholarly journals Laboratory Evaluation and Design of Construction and Demolition Wastes for Granular Base

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jin Yi ◽  
Chenghao Liang ◽  
Junfeng Qian ◽  
Jue Li ◽  
Yongsheng Yao
Keyword(s):  
Resilient Modulus ◽  
Construction Material ◽  
Base Material ◽  
Aggregate Size ◽  
Potential Method ◽  
Recycled Aggregate ◽  
Laboratory Evaluation ◽  
Limestone Aggregate ◽  
Replacement Treatment ◽  
Granular Base

Using recycled aggregate from construction and demolition (C&D) wastes as a construction material is a potential method for solving the disposal of C&D wastes, which can reduce the exploitation of natural aggregate. In this study, extensive laboratory tests were carried out to investigate the reliability of the C&D wastes used as road base material. Meanwhile, the gradation design and the dominant aggregate size range were considered, and a physical disposal method was proposed to enhance the structural performance of the recycled material by replacing the skeleton of the recycled aggregate (RA) with high-quality limestone. The test results showed that (1) given the high absorbency and fragility of C&D wastes, its RA was not enough to provide the strength and stability required by the base; (2) the compaction characteristics of the RA are quite different from that of the limestone aggregate, but the final compaction effect is basically the same; (3) the replacement treatment proposed in this study is an effective approach to improve the performance of the recycled granular base because the breakage rate decreased by at least 28.2% and the mechanical properties increased by approximately 50% compared with that of the untreated specimen; and (4) when the limestone content reached 75%, the California bearing ratio and the resilient modulus of the graded B specimen exceeded 120% and 200 MPa, respectively, satisfying the pavement requirement in medium traffic.

The Study on Road Performance and Pavement Structure Analysis for the Base Layer Material Stabilized by SRX

2012 ◽  
Vol 594-597 ◽  
pp. 1402-1406 ◽  
Author(s):  
Yue Zhang ◽  
Yun Long Zhao ◽  
Bao Yang Yu
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Base Material ◽  
Base Layer ◽  
Rigid Base ◽  
The Road ◽  
Flexible Material ◽  
Calculation Results ◽  
Road Performance ◽  
Pavement Structure

In order to overcome the weakness of semi-rigidity base layer，the road performance of the SRX(Solution Road RomixSoilfix) stabilized base material and the mechanics response of asphalt pavement with the base layer stabilized by SRX have been studied in this paper. The CBR value and resilient modulus of SRX stabilized base material were given by indoor test. Based on the multiple layer elastic theory, both the mechanical responses of asphalt pavement structure with the SRX stabilized base and semi-rigid base were given, and according to the calculation results, the two kinds of pavement structure fatigue life were analyzed. The results have shown that the CBR value of SRX flexible material is greater than that of graded crushed stone; the SRX stable material can be used as pavement base layer, but the fatigue performance of SRX flexible base materials should be paid much attention.

Investigation of shear stiffness and rutting in asphalt concrete mixes

2004 ◽  
Vol 31 (2) ◽  
pp. 253-262 ◽  
Author(s):  
Wael Bekheet ◽  
A O Abd El Halim ◽  
Said M Easa ◽  
Joseph Ponniah
Keyword(s):  
Asphalt Concrete ◽  
Laboratory Testing ◽  
Resilient Modulus ◽  
Shear Stiffness ◽  
Test Site ◽  
Laboratory Evaluation ◽  
Experimental Program ◽  
Bivariate Analysis ◽  
Shear Properties

Field and laboratory testing programs were set up to evaluate the in-situ shear properties of asphalt concrete mixes using the newly developed in-situ shear stiffness testing (InSiSSTTM) facility versus the laboratory evaluation using the resilient modulus and torsion testing. The LTPP SPS-9A 870900 test site, which has six similar pavement sections with different AC surface mix properties, was tested in the field using the InSiSSTTM and core samples were extracted from the site and tested in the laboratory. The results of the testing program were correlated with the rutting of the test sections over a 4-year period. In this paper, the InSiSSTTM facility is briefly introduced and the interpretation of the data collected is presented. The experimental program and analysis procedures are then outlined. The analysis of variance was used to test the significance of the results, and a bivariate analysis was performed for correlating rutting (as a criterion variable) and the different laboratory and field measured material properties (as predictor variables). Finally, a regression analysis between the in-situ shear stiffness and pavement rutting is presented. The results of the study showed that the in-situ shear stiffness had the highest correlation coefficient with rutting rate, and this might be a suitable measure to characterize the asphalt mixes and evaluate the rutting potential of asphalt pavements. This important result should be useful to the pavement engineers interested in the evaluation of rutting using a simple field measure.Key words: in-situ testing, laboratory testing, shear stiffness, shear properties, asphalt concrete, pavements, rutting, long-term performance.

Evaluation of Excess Foundry System Sands for Use as Subbase Material

2000 ◽  
Vol 1714 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Jay R. Kleven ◽  
Tuncer B. Edil ◽  
Craig H. Benson
Keyword(s):  
Water Content ◽  
Resilient Modulus ◽  
Base Material ◽  
High Volume ◽  
Engineering Properties ◽  
Reference Base ◽  
Bulk Stress ◽  
Optimum Water Content ◽  
Compactive Effort ◽  
Optimum Water

Earthwork associated with highway construction provides an opportunity for high-volume reuse of excess system sands (ESS) discarded by the foundry industry. California bearing ratio (CBR), unconfined compressive strength, and resilient modulus tests were conducted on 13 ESS, one base sand, and two reference materials. Tests were conducted on specimens prepared dry of optimum, wet of optimum, and at optimum water content with standard and modified Proctor compaction effort. Results of these tests were used to identify characteristic engineering properties of ESS, appropriate compaction conditions for ESS when used as subbase, and empirical equations that can be used to predict the engineering properties of ESS based on index properties. Results of the tests indicate that ESS classify as SP, SM, or SP-SM (A-2-4 or A-3 in AASHTO) and should be compacted dry or at optimum water content and, if possible, with higher compactive effort. The CBR of the ESS ranged from 4 to 40 and averaged 20 when compacted with standard effort at optimum water content. Swell during the soaking portion of the CBR tests was small for all ESS. ESS compacted at optimum water content with standard effort had unconfined compressive strengths ranging from 71 to 190 kPa. Resilient moduli of the ESS were similar to that of a reference subbase material but smaller than a reference base material. A power function model in terms of bulk stress described resilient moduli of the ESS well.

Availability of Resilient Modulus and Permanent Deformation Laboratory Tests of Stabilized Soil with Coal Ashes for Pavements Base

2012 ◽  
Vol 517 ◽  
pp. 570-576 ◽  
Author(s):  
L.S.E. Lopes ◽  
P. Vargas ◽  
M.D.T. Casagrande ◽  
L.M.G. Motta
Keyword(s):  
Mechanical Properties ◽  
Power Plants ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Thermal Power ◽  
Bottom Ash ◽  
Base Material ◽  
Coal Ash ◽  
Stabilized Soil ◽  
Ash Disposal

Fly and Bottom ash a coal combustion residue of thermal power plants has been regarded as a problematic residue all over the world. This study presents the results of testing for resilient modulus and permanent deformation to evaluate the mechanical properties of a soil stabilized with fly or bottom ashes, with and without lime addition. The soil tested is a regional sandy soil, which is not suitable for use in pavement works. The addition of fly ash with lime improved their mechanical properties, these being dependent on the ash content, moisture and number of load cycles. However in the mixtures only with ashes, the improvement was lower than the mixtures with ashes and lime. It was performed a paving project to assess their competitiveness as a base material for pavements. The results of this project showed that the soil stabilized with ashes is competitive for low volume traffic roads, with the advantages of minimizing the environmental problems caused by coal ash disposal.

Research on Mechanical Properties of Solidification Agent Stabilized Iron Tailing Gravel

2012 ◽  
Vol 204-208 ◽  
pp. 3890-3894 ◽  
Author(s):  
Song Yin ◽  
Chang Li Xiao ◽  
Jin Chao Yue
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Resilient Modulus ◽  
Base Material ◽  
Test Methods ◽  
Highway Engineering ◽  
Splitting Strength ◽  
Current Specification ◽  
Curing Age

Based on the method in Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering, the unconfined compressive strength, the splitting strength and the resilient modulus were tested to research the mechanical properties of solidification agent stabilized iron tailing gravel. Meanwhile the influences of solidification agent content and curing age on the mechanical properties of solidification agent stabilized iron tailing gravel were investigated. The results show that solidification agent stabilized iron tailing gravel has better mechanical properties. The mechanical properties of solidification agent stabilized iron tailing gravel conform to the current specification, so it can be used as highway sub-base material.

scholarly journals Evaluation of Reclaimed Hydrated Fly Ash as an Aggregate for Sustainable Roadway Base Material

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Mark H. Wayne ◽  
David J. White ◽  
Jayhyun Kwon ◽  
Jacek Kawalec
Keyword(s):  
Fly Ash ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Base Material ◽  
Performance Testing ◽  
Load Test ◽  
Plate Load Test ◽  
Laboratory Test Results ◽  
Class C

This paper summarizes the findings from laboratory and field performance testing of reclaimed hydrated class C fly ash (HFA) stabilized with a triangular aperture geogrid. This phase of testing was performed on HFA laboratory specimens and field test sections. The laboratory test results provided estimates for design input values, while the field testing assessed performance characteristics including the as-constructed modulus of the subgrade reaction, the in situ resilient modulus, and permanent deformation. For the laboratory portion, all results were derived from tests conducted on specimens immediately after sample preparation and after a 7-day cure. The compressive strength of reclaimed hydrated class C fly ash increases with curing. The strength of the HFA material can be further increased when mixed with a chemical stabilizer. For this project, chemical stabilization with lime was not viable because the lime supplier was too far from both HFA source and project site. Based on cyclic plate load tests, the in situ resilient modulus of the HFA and geogrid-stabilized HFA layers were determined on site. This paper reports the findings from the laboratory and field plate load test and highlights the potential use of geogrids in the stabilization of HFA.

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