Performance Evaluation of Strengthening Recycled Coarse Aggregate in Cement Stabilized Mixture Base Layer of Pavement

Zhang, Junhui; Li, Cheng; Ding, Le; Zhao, Henggang

doi:10.1155/2020/8821048

Cited by 10 publications

(4 citation statements)

References 42 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, C&DW is mainly used for roadbed filling and pavement in road projects. For example, Zhang [10] et al investigated the changes in the properties of recycled coarse aggregate during the reinforcement of cement stabilized mixture base of pavement. Kumar [11] et al investigated the effect of recycled aggregate from C&DW on the abrasion resistance of pavement concrete.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Zhang,

Yu,

Zhang

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

Construction and demolition waste (C&DW) has been mainly used in the field of building materials and road engineering, but relatively few applications in soft soil foundation treatment. This study was aimed to the performance evaluation of the Cement Fly-ash Gravel (CFG) piles using recycled C&DW aggregates in soft ground foundations in inland saline areas, in coasts with high water content and rich in a large number of erosive salt ions. In this paper, erosion experiment simulation conditions were set, the test object was recycled aggregate CFG piles, and the control group was modified aggregate CFG piles and natural aggregate CFG piles under the same conditions. Through the compressive strength test and water absorption test on the pile specimens under different erosion conditions, the changes in the strength and water content of the piles before and after the erosion were obtained. The prediction formulae of water absorption and compressive strength of the piles in the submerged environment and the compressive strength of the piles in the salt-ionized environment were proposed, which reveal the performance deterioration of the recycled aggregate CFG piles. The experimental results showed that the water absorption rate of CFG piles with recycled aggregate under long-term water immersion conditions firstly increased and then tended to stabilize with the immersion time. The change of its compressive strength firstly increased and then declined and finally tended to stabilize. The change of the compressive strength gradually decreased with the salt ion concentration under the salt ion erosion environment.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Zhang,

Yu,

Zhang

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…While retrievable items such as bricks, wood, metals, and tiles are recycled, concrete and masonry wastes accounting for more than 50% of the waste from construction and demolition activities, are not being currently recycled in India. Recycling of concrete and masonry waste is however being done in abroad like U.K., USA, France, Denmark, Germany, Japan and China [2][3]. However, studies on physical properties, mechanical behavior, and durability of RCA materials are quite recent [4][5].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Analysis of Recycled Cement Stabilized Concrete Aggregates as Subbase Materials

B. G,

Sanganaikar,

S. N

2024

jchr

View full text Add to dashboard Cite

Rigid Pavement rehabilitation and reconstruction of concrete structures generate large quantities of Recycled Concrete Aggregate (RCA). These recycled aggregates could be used as material for subbase courses in pavement construction. The strength characteristics of RCA materials usually limit their application in road subbases. The high volume usage of RCA in subbase applications is better ensured by meeting the minimum standards set by the specification for material performance. When used as a substitute for natural aggregates in subbase applications, most RCA materials do not often meet the minimum requirements set by the specification. In such cases, stabilization with different stabilizers allows the use of these RCA's materials with the minimum required strength characteristics. In the present study, an attempt is made to evaluate the suitability of RCA as a subbase material using Ordinary Portland Cement (OPC) as a binding material. Concrete waste was pulverized and sieved to obtain the required gradation for the granular subbase (Gradation-II) as per MORT&H-V revision. RCA is treated with different dosages of cement and samples were prepared. The prepared samples were cured for 3, 7 & 28 days, and were tested. Compaction, California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS), and permeability tests were conducted. From the laboratory studies conducted, it is observed that the Portland cement stabilized RCA mix exhibits an increase in strength, with an increase in the dosage of stabilizer and curing period.

show abstract

“…In order to improve the properties of RCA, various treatment methods have been attempted. At present, there are mainly three approaches: (a) eliminate the old mortar by grinding, heating grinding or acid solution et al [ 15 , 16 , 17 , 18 , 19 ]; (b) strengthen the old mortar with CO 2 , sodium silicate or nano materials et al [ 1 , 20 , 21 , 22 , 23 , 24 , 25 ]; (c) coat the surface by immersing RCA in cement-based slurries such as cement, fly ash and silica fume et al [ 26 , 27 , 28 , 29 , 30 ]. All the above approaches can improve the properties of RCA to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate

Yin

Kang

et al. 2022

Materials

View full text Add to dashboard Cite

The inferior property is usually one of the major problems of recycled coarse aggregate (RCA), and the utilization of the RCA is limited. Strengthening the RCA is being widely explored. Immersing the RCA in the cement-based slurry is an effective approach. However, lots of slurry and time are required, and it is difficult to integrate the immersing method into the production line of the RCA. In this paper, a circular spraying method was proposed to treat the RCA using cement-based slurry. The immersing method was also conducted to verify the feasibility of the spraying method. The crushing value (CV), 24 h water absorption (WA), apparent density (AD) and dynamic water absorption (DWA) were tested, and the micro-morphology was also observed to explore the strengthening mechanism. Results showed that the CV and the WA decreased by up to 30.0% and 14.3% when the spraying method was used. The AD was slightly influenced by the cement-based slurry regardless of the treatment method. Considering the CV, WA and AD, the comprehensive grade of the RCA could be enhanced from III to II by using the spraying method. It was worth noting that the effects of the spraying method and the immersing method were basically equivalent. When the spraying method was adopted, only about 1 min and a small amount of slurry (about 5% of the RCA mass) were required to treat the RCA.

show abstract

Performance Evaluation of Strengthening Recycled Coarse Aggregate in Cement Stabilized Mixture Base Layer of Pavement

Cited by 10 publications

References 42 publications

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Performance evaluation of Cement Fly-ash Gravel piles of recycled construction and demolition waste aggregates under erosion conditions

Laboratory Analysis of Recycled Cement Stabilized Concrete Aggregates as Subbase Materials

Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate

Contact Info

Product

Resources

About