Paper Title:
Excessively Wet Subgrade Improvement with 100% Industry By-Products for Heavy Traffic Pavement – II. Mechanical Behavior and Durability of Stabilized Soils
  Abstract

The workability of excessively wet subgrade can be effectively improved by using a “green materials” based entirely on industry byproduct of combination of fly ash (FA) with carbide lime (CL) and flue gas desulfurization gypsum (FGDG). This paper presents the results of a further systematic investigation on the mechanical behavior and durability of FA/CL/FGDG treated silt from Dezhou in Shandong province. FA, CL and FGDG were added at 3 levels in percentages of 8%-24%, 2%-6% and 1%-3% by dry weight of the soils, respectively. The unconfined compressive strength as well as splitting tensile strength (STS), volumetric expansion (VE), California bearing ratio (CBR), dry-wet cycles test and freeze-thaw cycles test were performed. The best strength of 0.802MPa was achieved for 24%FA/6%CL/1%FGDG treated soil, while the 16%FA/6%CL/1%FGDG treated soil also produce good strengths of 0.742MPa, after 7 days curing. STS keeps increasing with curing period in the first 8 weeks throughout the investigation. According to the VE test, a mellowing period may help prevent swelling from ettringite precipitation by letting these minerals form and hydrate before compaction. The FA/CL/FGDG treated soil has a better durability with strength loss ratio less than 15% after 10 wet-dry cycles, and the maximum weight loss around 25% after 10 freeze–thaw cycles. CBR decreases with decrease of compaction degree, but the values are still around 70 even in a poor compaction degree of 93%, meeting the general requirements of subgrade. So, if the silt subgrade is in excessively wet state and could not be compacted to the required density, the modified subgrade would still serve as a strong platform and could provide necessary support for pavement.

  Info
Periodical
Advanced Materials Research (Volumes 113-116)
Edited by
Zhenyu Du and X.B Sun
Pages
1429-1432
DOI
10.4028/www.scientific.net/AMR.113-116.1429
Citation
X. Z. Yuan, C. C. Liu, W. Cui, F. Liu, "Excessively Wet Subgrade Improvement with 100% Industry By-Products for Heavy Traffic Pavement – II. Mechanical Behavior and Durability of Stabilized Soils", Advanced Materials Research, Vols. 113-116, pp. 1429-1432, 2010
Online since
June 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Guo Hua Xie, He Qing Du, Shu Jing Zhu, Yong Jie Xue
Abstract:Four kinds of industrial solid waste, granulated blast furnace slag (GBFS), electric furnace steel slag (EFSS), semi-dry flue gas...
711
Authors: Yun Lian Song, Ya Wei Zhang, Jing Yu
Abstract:The representative aeolian sand taken from Horqin desert freeway is used as Subgrade Material. In this paper, California Bearing Ratio (CBR)...
519
Authors: Xin Ping Li, Ya Ni Lu, Xing Hong Wu
Abstract:In view of the fact that large amounts of tonhaltig phyllite were found along the Shi-Tian expressway line, these soft rocks could not meet...
2586
Authors: Yun Dong, Bao Tian Wang
Chapter 1: Traditional Building Materials
Abstract:Lime Stabilized expansive soil is often used as filler in road subgrade, although many scholars have done a lot of research, the mechanical...
166
Authors: Bazid Khan, Abdus Siraj, Riaz A. Khattak
Abstract:The subgrade soil of western by Pass Road Mardan, Pakistan consists of silty clay belonging to A-6(14) group of the AASHTO soil...
93