Study on Key Technical Index for Construction of Base Course with Cement Fly-Ash-Flushed-by-Seawater Stabilized Crushed-Stones

2011 ◽  
Vol 4 (6) ◽  
pp. 2547-2550 ◽  
Author(s):  
Longsheng Bao ◽  
Ling Yu ◽  
Wenbiao Wang ◽  
Ketong Liu ◽  
Guangshan Zhu
Keyword(s):  
Fly Ash ◽  
Base Course

scholarly journals Studies on the Volumetric Stability and Mechanical Properties of Cement-Fly-Ash-Stabilized Steel Slag

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 495
Author(s):  
Mingkai Zhou ◽  
Xu Cheng ◽  
Xiao Chen
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Steel Slag ◽  
Critical Issue ◽  
Expansion Behavior ◽  
Strength Tests ◽  
Road Materials ◽  
Base Course ◽  
The Stability ◽  
Aggregate Base

The stability of steel-slag road materials remains a critical issue in their utilization as an aggregate base course. In this pursuit, the present study was envisaged to investigate the effects of fly ash on the mechanical properties and expansion behavior of cement-fly-ash-stabilized steel slag. Strength tests and expansion tests of the cement-fly-ash-stabilized steel slag with varying additions of fly ash were carried out. The results indicate that the cement-fly-ash-stabilized steel slag exhibited good mechanical properties. The expansion rate and the number of bulges of the stabilized material reduced with an increase in the addition. When the addition of fly ash was 30–60%, the stabilized material was not damaged due to expansion. Furthermore, the results of X-CT, XRD and SEM-EDS show that fly ash reacted with the expansive component of the steel slag. In addition, the macro structure of the stabilized material was found to be changed by an increase in the concentration of the fly ash, in order to improve the volumetric stability. Our study shows that the cement-fly-ash-stabilized steel slag exhibits good mechanical properties and volumetric stability with reasonable additions of fly ash.

scholarly journals The advantage of virgin soil in rural service road constructions

2013 ◽  
Vol 12 (3) ◽  
pp. 129-136
Author(s):  
Michał Ćwiąkała ◽  
Andrzej Greinert ◽  
Joanna Korzeniowska ◽  
Paweł Tarasewicz
Keyword(s):  
Grain Size ◽  
Fly Ash ◽  
Power Plant ◽  
Virgin Soil ◽  
Binding Agent ◽  
White Cement ◽  
Soil Cement ◽  
Base Course ◽  
Main Component ◽  
Rural Service

Virgin soils as a result of geotechnical processes are element of road’s solid bottom. The bottom ought to have enough capacity and durability which is provided by proper virgin sub-grade’s enhancement. The sub-grade is road’s base course right bottom. It is possible to improve virgin soil’s parameters by road’s hydraulic binding agent. The agent is a mineral frame’s micro-particle extender or enhancement. The researches were focused to define main soil-cement compound’s mechanical parameter called CBR. Compounds consisted of rural virgin soils (five grain-size types) and two hydraulic agent types (endurance rates 3 MPa and 9 MPa). Hydraulic agent’s main component was activated fly ash and white cement (CEM I 42,5 MPa). The ash is from Pątnów Power Plant and is a result of brown coal burning. The researches answered that it is possible to exploit virgin soils in rural service road’s construction thanks to innovative road cements with binding qualities.

Researches on the Application of Cement and Fly-Ash-Flushed-by-Seawater Stabilized Crushed-Stones Roadbases

2013 ◽  
Vol 785-786 ◽  
pp. 317-322
Author(s):  
Long Sheng Bao ◽  
Wen Jing Wu ◽  
Ling Yu ◽  
Guang Shan Zhu
Keyword(s):  
Fly Ash ◽  
Laboratory Tests ◽  
Mixture Ratio ◽  
The Future ◽  
Base Course ◽  
Key Techniques

In order to prove that the ability of the construction of the base course with cement-fly-ash-flushedby-seawater stabilized crushed-stones and the materials‘ spreading across the country in the future, the paper start to analyze and research the micro reaction and macro properties about the cement and fly-ash-flushed-by- seawater binder along with the cement and typical fly-ash binder, which based on a series of contrastive laboratory tests. When the mixture ratio of cement and fly-ash-flushed-by-seawater binder ,In addition, the key techniques indexes for construction ,which are controlled seriously ,It is unparalleled that the utilization of the cement and fly-ash-flushed-by-seawater stabilized crushed-stones in the construction of base course.

Practical Approach to Criteria for the Use of Lime–Fly Ash Stabilization in Base Courses

2005 ◽  
Vol 1936 (1) ◽  
pp. 20-27 ◽  
Author(s):  
William F. Barstis ◽  
John Metcalf
Keyword(s):  
Fly Ash ◽  
Current Method ◽  
Visual Observation ◽  
Base Layer ◽  
Soil Base ◽  
Base Course Material ◽  
Stabilized Soil ◽  
Base Course ◽  
Additional Support

In October 2000 the Mississippi Department of Transportation (MDOT) initiated a study to evaluate the long-term performance of lime–fly ash (LFA) stabilized soil as a base course material. This study entailed performing falling weight deflectometer (FWD) tests on both newer and older pavements and coring pavement at each FWD location to observe the condition of the layers, to obtain pavement thicknesses, and to perform unconfined compressive strength (UCS) testing. Visual observation, backcalculated modulus, and in situ structural layer coefficient values showed that MDOT LFA-stabilized soil base courses have highly variable material properties and thicknesses. Recommendations were made to increase the average LFA material property values and to reduce the spread in these values by increasing the required compaction of the LFA-stabilized soil base layer to 100% standard Proctor effort, setting the required in situ Proctor UCS at 400 psi, and reducing variability by either improving the current method of field-mixed-in-place stabilization or requiring plant-mixed material with placement of the blended material via a paver. It is further recommended to increase the typical LFA-stabilized soil base layer design thickness from 6 to 8 in. and to use a 6-in. chemically stabilized subgrade layer to provide additional support to the pavement structure.

Research on Shrinking Performance of Recycled Asphalt Pavement Material Stabilized with Inorganic Binder

2015 ◽  
Vol 727-728 ◽  
pp. 25-29
Author(s):  
Bo Peng ◽  
Wen Ying Li ◽  
Guang Kai Yin ◽  
Zhi Hao Cheng
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Inorganic Binder ◽  
Different Types ◽  
Dry Shrinkage ◽  
Erosion Properties ◽  
Base Course ◽  
Test Result

This paper studies on shrinkage performance of recycled asphalt pavement (RAP) material blended with inorganic binder such as cement, lime-fly ash (lime and fly ash) and three ashes (cement, lime and fly ash), with certain intensity used as base course. The erosion, dry shrinkage and temperature shrinkage tests were conducted on the recycled asphalt pavement (RAP) material blended with the three kinds of inorganic binder, to evaluate and compare different types of cold recycled inorganic material shrinkage resistance capability and anti-erosion properties. After analyzing the fatigue test result of three-additives-stabilized recycled mixture, it showed that the recycled pavement mixture owned preferable anti-erosion properties, anti-temperature shrinkage resistance and anti-dry shrinkage performance.

Use of cement-chelated, solidified, municipal solid waste incinerator (MSWI) fly ash for pavement material: mechanical and environmental evaluations

2017 ◽  
Vol 54 (11) ◽  
pp. 1553-1566 ◽  
Author(s):  
Qiang Tang ◽  
Yu Zhang ◽  
Yufeng Gao ◽  
Fan Gu
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Chelating Agent ◽  
Waste Incinerator ◽  
Curing Time ◽  
Mswi Fly Ash ◽  
Element Analysis ◽  
Base Course ◽  
Pavement Material

As a by-product from the incineration of municipal solid waste (MSW), fly ash usually contains mobile heavy metals that may engender severe pollution when reused. In this study, fly ash was solidified with cement and a chelating agent to immobilize these polluting elements. The possibility of using the solidified fly ash for pavement materials was also assessed through mechanical and environmental perspectives. According to the results, the strength of solidified fly ash was found proportional to both the cement/fly ash ratio and curing time. This indicated that the increase of fly ash loading reduced the concentration of products from cement hydration, and thus destroyed the structure of the products of hydration. With the increase of freeze–thaw cycles, the compressive strength of cement-stabilized fly ash decreased between days 7 and 14, and then increased between days 14 and 28. Subsequently, the finite element analysis showed that placing the solidified fly ash layer as a pavement material between an unbound base course and subgrade was beneficial to prolong fatigue life and reduce rutting distress of asphalt pavements. Finally, leachability of metals from the mixtures was tested, which showed that leaching concentration decreased as the cement/ash ratio, curing time, and chelating agent content increased.

Resilient Properties and Fatigue Damage in Stabilized Recycled Aggregate Base Course Material

1998 ◽  
Vol 1611 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Khaled Sobhan ◽  
Raymond J. Krizek
Keyword(s):  
Elastic Modulus ◽  
Fly Ash ◽  
Fatigue Damage ◽  
Damage Accumulation ◽  
Resilient Modulus ◽  
Recycled Aggregate ◽  
Fiber Reinforced ◽  
Base Course Material ◽  
Course Material ◽  
Base Course

A stabilized fiber-reinforced base course material composed largely of recycled concrete aggregate with small amounts of portland cement and fly ash was subjected to repeated flexural loading to evaluate its resilient properties and progressive accumulation of fatigue damage. Cyclic load-deformation data were recorded continuously during the entire fatigue life until fracture to determine ( a) the magnitude and variation of cumulative plastic strain and dynamic elastic modulus as a function of the number of loading cycles, ( b) a range for the resilient modulus, and ( c) the effect of fiber inclusions on the dynamic material properties and rate of damage accumulation. The extent of fatigue damage was calculated as a fatigue damage index, which is based on the cumulative energy dissipated (absorbed) during cyclic loading. All beam specimens used in this experimental program contained (by weight) 4 percent cement, 4 percent fly ash, and 92 percent recycled aggregate; the fiber-reinforced specimens contained an additional 4 percent (by weight) hooked-end steel fibers. Results show that the resilient modulus in flexure varies between about 2.75 GPa (400,000 lbf/in2.) and 10.4 GPa (1.5 million lbf/in.2) and the degradation of the dynamic elastic modulus does not exceed 25 percent of the initial modulus. Miner’s Rule of linear summation of damage is applicable to unreinforced material but not to fiber-reinforced material. In general, a modest amount of reinforcing fibers was very effective in retarding the rate of fatigue damage accumulation in this lean cementitious composite.

Sign in / Sign up

Export Citation Format

Share Document