PFWD, DCP and CBR correlations for evaluation of lateritic subgrades

George, Varghese; Rao, Nageshwar Ch.; Shivashankar, R.

doi:10.1080/10298430802342765

Cited by 43 publications

(23 citation statements)

References 9 publications

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“…Similar results were also obtained by George et al (2009) for lateritic subgrades. Livneh and Livneh (2013) suggest that such equations, owing to the considerable uncertainty associated with DCP tests results, should be used in tandem with conventional density tests, such as the nuclear gauge.…”

Section: Anvilsupporting

confidence: 79%

“…Penetration from surface to 6-inch depth NDCP ð6 00 2to212 00 Þ ¼ 27 £ e ½20:08£PI£ðF 40=100Þ PI: Plasticity index of compacted soil (%) Penetration from 6-inch to 12-inch depth from top of compacted soil F40: Percentage passing #40 sieve Hopkins, 2000;George, Rao, & Shivashankar, 2009;Mohammad & Herath, 2007). Salgado and Yoon (2003) developed the following correlation between the DCP penetration ratio PR and the in situ dry density of clayey sands:…”

Section: Anvilmentioning

confidence: 99%

See 1 more Smart Citation

QA/QC of Subgrade and Embankment Construction: Technology Replacement and Updated Procedures

Ganju¹,

Prezzi²,

Salgado³

et al. 2015

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Section: Anvilsupporting

confidence: 79%

Section: Anvilmentioning

confidence: 99%

QA/QC of Subgrade and Embankment Construction: Technology Replacement and Updated Procedures

Ganju¹,

Prezzi²,

Salgado³

et al. 2015

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“…The relationship between DCPI and CBR for different types of soil can be expressed by the following equation (Harison, 1987;Webster et al, 1992;Gabr et al, 2000;George et al, 2009):…”

Section: Dcp Testmentioning

confidence: 99%

Field evaluation of soft highway subgrade soil stabilized with calcium carbide residue

Jiang

Liu

et al. 2016

Soils and Foundations

115

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Calcium carbide residue (CCR) is a by-product of acetylene gas production. Stockpiles of CCR continue to accumulate worldwide, in both developed and developing countries. Sustainable reuse options for CCR in civil infrastructures, such as road embankments, have been recently evaluated in the laboratory. However, to date there are limited studies on the actual field performance of CCR in stabilizing clayey soils in highway subgrades. In this study, a field trial was conducted to ascertain the viability of using CCR stabilized clayey soil as a highway subgrade course material. Quicklime was selected as a control binder in the field trial for comparison purposes. The construction procedures of the CCR and quicklime stabilizations in two field sections are presented. A series of field tests, including California Bearing Ratio (CBR) test, plate loading test, Benkelman beam deflection test, and dynamic cone penetrometer (DCP) test were undertaken after the embankment construction. The results indicated that in the top zone of the filled soil layers with 94% degree of compaction, the CCR stabilized subgrade soil exhibited higher values of CBR and resilient modulus, and lower values of resilient deflection and DCP Index relative to the quicklime stabilized soil. The field trial results indicated that CCR had negligible environmental effects and furthermore resulted in low construction costs. Based on the field test results, CCR was found to be a viable alternative binder for stabilizing soft subgrade soils. The outcomes of this research are significant from engineering, economic and environmental perspectives.

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“…Phillips and Freeman (2003), Nazzal (2003) and George et al (2009) showed that there is good correlation between these parameters; whereas, poor correlation was reported in some other research works (Seyman 2003;Phillips 2005). In addition, different correlations have been determined between the PFWD and FWD back-calculation moduli (Steinert et al 2006;George 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Portable Falling Weight Deflectometer (PFWD) is a light device which can serve as possible alternative replacement. Due to its simplicity in design, portability, and the added advantages of providing quick and reliable estimates of the stiffness modulus, the use of PFWD is gaining popularity in the recent years (George et al 2009). Although multiple versions of these devices have been evaluated in the U.S., Europe, and Japan for quality control during construction, the applicability of using this equipment is relatively unknown.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of PFWD as Potential Quality Control Tool of Pavement Layers

Kavussi

Rafiei

Yasrobi

2010

Journal of Civil Engineering and Management

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Abstract. Portable Falling Weight Deflectometer (PFWD) that can be considered as simple equipment is mainly used to measure elastic moduli of pavement unbound layers. This paper evaluates the potential use of PFWD to reliably measure the elastic modulus of pavement layers. To achieve this, PFWD tests were conducted on highway sections selected from different projects in Tehran. The California Bearing Ratio (CBR) laboratory tests were also conducted on samples collected during field tests. PFWD testing parameters were varied while performing the field testing. These included drop weight, drop height, plate diameter and position of additional geophones. In addition, PFWD moduli were compared with those obtained from performing FWD testing on the same site. It was found that drop mass and loading plate size affect PFWD modulus significantly. In addition, the results indicated that good correlation exist between PFWD moduli and FWD and CBR results.

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PFWD, DCP and CBR correlations for evaluation of lateritic subgrades

Cited by 43 publications

References 9 publications

QA/QC of Subgrade and Embankment Construction: Technology Replacement and Updated Procedures

QA/QC of Subgrade and Embankment Construction: Technology Replacement and Updated Procedures

Field evaluation of soft highway subgrade soil stabilized with calcium carbide residue

Evaluation of PFWD as Potential Quality Control Tool of Pavement Layers

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