scholarly journals Optimisation of the innovative hydraulic binder composition for its versatile use in recycled road base layer

2019 ◽  
Vol 603 ◽  
pp. 032044 ◽  
Author(s):  
Grzegorz Mazurek ◽  
Marek Iwanski
Keyword(s):  
Base Layer ◽  
Road Base ◽  
Hydraulic Binder ◽  
Binder Composition

scholarly journals Application of the foamed bitumen and bitumen emulsion to the road base mixes in the deep cold recycling technology

2016 ◽  
Vol 11 (4) ◽  
pp. 291-301 ◽  
Author(s):  
Marek Iwański ◽  
Anna Chomicz-Kowalska
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Base Layer ◽  
The Road ◽  
Road Base ◽  
Bitumen Emulsion ◽  
Recycling Technology ◽  
Indirect Tensile ◽  
Foamed Bitumen ◽  
Cold Recycling

This paper presents findings of a study concerning the influence of binder type on the mechanical properties of road base in the cold recycling technology. The principal aim of this investigation was to evaluate the mixes in scope of susceptibility to moisture and low-temperatures. In the comparative research foamed bitumen and bitumen emulsion were used in four different concentrations (2.0%, 2.5%, 3.0%, 3.5%). The materials used in the study were reclaimed from an existing road construction layers: reclaimed aggregate from the road base and reclaimed asphalt pavement obtained by milling the surface and binder course. Portland cement in 2.0% concentration was used as a hydraulic binder. The evaluated parameters were: indirect tensile strengths, tensile strength retained and indirect tensile stiffness modulus at 25 °C. These tests were complemented by an evaluation of susceptibility to moisture and frost according to modified procedures implemented by American researchers: Tunnicliff, Root and Lottman. Moreover, tests for low-temperature cracking were conducted according to Finnish standard. The investigations showed that the use of foamed bitumen for road base layer produced in the cold recycling technology results in better mechanical properties and resistance to moisture and frost compared to using bitumen emulsion. The use of 2.5% of foamed bitumen and 2.0% of Portland cement in the recycled road base allowed to meet the established criteria.

scholarly journals The Analysis of Stress Distribution on the Physical Model of Road Base Layer

2020 ◽  
Vol 12 (8) ◽  
Author(s):  
◽  
Azman Mohamed ◽  
Hasanan Md. Nor ◽  
Nur Hafizah A. Khalid ◽  
◽  
...  
Keyword(s):  
Stress Distribution ◽  
Physical Model ◽  
Base Layer ◽  
Road Base

Fibre optic sensing measurement of static surface load distribution on road base layer

2020 ◽  
Vol 849 ◽  
pp. 012045
Author(s):  
G G Giwangkara ◽  
A Mohamed ◽  
N H A Khalid ◽  
H M Nor ◽  
I S Ahmad ◽  
...  
Keyword(s):  
Load Distribution ◽  
Base Layer ◽  
Surface Load ◽  
Fibre Optic ◽  
Road Base

scholarly journals Compaction Procedures and Associated Environmental Impacts Analysis for Application of Steel Slag in Road Base Layer

2021 ◽  
Vol 13 (8) ◽  
pp. 4396
Author(s):  
Bo Gao ◽  
Chao Yang ◽  
Yingxue Zou ◽  
Fusong Wang ◽  
Xiaojun Zhou ◽  
...  
Keyword(s):  
Environmental Impacts ◽  
Steel Slag ◽  
Base Layer ◽  
Land Occupation ◽  
Additional Energy ◽  
Vibration Period ◽  
The Road ◽  
Road Base ◽  
Natural Aggregates ◽  
Pavement Construction

In recent years, recycling steel slag is receiving growing interest in the road base layer construction field due to its role in alleviating land occupation and resource shortages. However, the mixture compaction and its environmental impact on practical construction sites remain unclear, which may hinder the application of steel slags in road layers. This study investigates the pavement construction of the ‘Baotou-Maoming’ motorway, located in Inner Mongolia, China, analyzing the compaction procedures and assessing the environmental impacts caused by the road base layer containing steel slag. Firstly, mechanical properties and texture appearances of the steel slag aggregates are characterized. Afterwards, the comparative assessments for steel slag and andesite layers compaction are quantified from equivalent CO2 emission and energy consumption aspects, respectively. The results show that the steel slag has a better surface texture than the natural aggregates; physical properties including compactness, flatness and compressive strength comply with the requirements for applying steel slag to a hydraulically bound mixture. Compared to the base layer using andesite aggregates, the compaction vibration period of the course containing steel slags should be reduced to achieve a proper density due to the “hard-to-hard” effect that occurs between the adjacent steel slag particles. Consequently, the additional energy and the equivalent CO2 are generated at 2.67 MJ/m3 and 0.20 kg/m3, respectively.

scholarly journals Stiffness Identification of Foamed Asphalt Mixtures with Cement, Evaluated in Laboratory and In Situ in Road Pavements

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1128 ◽  
Author(s):  
Lukasz Skotnicki ◽  
Jarosław Kuźniewski ◽  
Antoni Szydlo
Keyword(s):  
Asphalt Mixtures ◽  
Base Layer ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Road Pavement ◽  
Foamed Asphalt ◽  
Fatigue Durability ◽  
Hydraulic Binder ◽  
Correlation Factors

The article presents the possibilities of using foamed asphalt in the recycling process to produce the base layer of road pavement constructions in Polish conditions. Foamed asphalt was combined with reclaimed asphalt pavement (RAP) and hydraulic binder (cement). Foamed asphalt mixtures with cement (FAC) were made, based on these ingredients. To reduce stiffness and cracking in the base layer, foamed asphalt (FA) was additionally used in the analyzed mixes containing cement. The laboratory analyzes allowed to estimate the stiffness and fatigue durability of the conglomerate. In the experimental section, measurements of deflections are made, modules of pavement layers are calculated, and their fatigue durability is determined. As a result of the research, new fatigue criteria for FAC mixtures and correlation factors of stiffness modules and fatigue durability in situ with the results of laboratory tests are developed. It is anticipated that FAC recycling technology will provide durable and safe road pavements.

scholarly journals Lime-based mortars with various binder composition: characterization and freeze-thaw resistance assessment

2021 ◽  
Vol 1205 (1) ◽  
pp. 012009
Author(s):  
D Janotova ◽  
Z Slizkova
Keyword(s):  
Outer Part ◽  
Testing Procedure ◽  
Lime Mortar ◽  
Curing Conditions ◽  
Binder Component ◽  
Hydraulic Binder ◽  
Lime Mortars ◽  
Hardened State ◽  
Binder Composition ◽  
Mixing Water

Abstract The study focused on lime mortars with different lime binder types regarding the frost attack effects on their microstructure and mechanical characteristics. The performances of studied mortars in hardened state was significantly influenced by the amount of mixing water and by curing conditions. Inhomogeneous microstructure was observed inside the 360 days old specimens with dimensions 40 × 40 × 160 mm in the case of all lime mortars types. The different state of the binder hardening with respect to various distances from the specimen surface and the different behaviour of matured outer part and immature inner part of lime mortar specimens influenced performed tests and reflected in all results. After 10 and 20 freeze cycles, respectively, the compressive strength of all lime mortar specimens with the hydraulic binder component increased, indicating a beneficial effect of the water on the hydration previously unreacted hydraulic binders. On the other hand, the flexural strength of the frost-aged specimens decreased significantly, indicating the drastic procedure of the test performed concerning lime mortars characteristics, especially when the pure air lime binder was used. Improvement of the testing procedure especially for lime mortars, which are characterized by slow hardening, was recommended.

scholarly journals Wood Fly Ash Stabilized Road Base Layers with High Recycled Asphalt Pavement Content

2021 ◽  
Vol 16 (2) ◽  
pp. 1-15
Author(s):  
Peteris Skels ◽  
Viktors Haritonovs ◽  
Edvards Pavlovskis
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Pilot Project ◽  
Base Layer ◽  
Freezing And Thawing ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Road Base ◽  
Proctor Test ◽  
Pavement Base

Wood fly ash stabilised road base layers with high recycled asphalt pavements content was studied both at the laboratory and in-situ. The original recipe was chosen based on an actual stabilised pavement base layer design with cement CEM II/B-T 42.5R but optimised using wood fly ash. The existing road base layer from gravel was mixed with dolomite aggregate and recycled asphalt pavement, adding cement and wood fly ash at different proportions. The mixture was compacted at optimal water content according to the Standard Proctor test and further conditioned. Resistance to freezing and thawing of hydraulically bound mixtures was checked after 28 days of conditioning. Even 50 cycles of freezing and thawing were used. Test results indicated wood fly ash as an effective alternative to the typically used cement for road base stabilisation, including recycled asphalt pavement material. Three hydraulically bound mixtures were chosen for test sections in the pilot project. The project includes five different sections with three different hydraulic binder recipes. The performance of each section was evaluated.

scholarly journals Testing noncohesive geogrid-reinforced soil in triaxial shear apparatus under cyclic loading

2021 ◽  
Vol 73 (01) ◽  
pp. 57-66
Author(s):  
Stjepan Lakusic
Keyword(s):  
Cyclic Loading ◽  
Triaxial Test ◽  
Base Material ◽  
Reinforced Soil ◽  
Base Layer ◽  
Aperture Size ◽  
Cyclic Triaxial Test ◽  
Cyclic Triaxial ◽  
Road Base ◽  
Cohesive Materials

In road base layers, geogrids assume the reinforcement or stabilization function where good interaction between geogrid and unbound base material is important. The cyclic triaxial test can be used for analysing interaction between geogrid and unbound base material. The paper includes an overview of research where cyclic triaxial test is primarily used for assessing the influence of parameters such as geogrid stiffness, geometry and aperture size, position and number of geogrid layers, on the interaction with the base layer material. The cyclic triaxial test can be used to determine contribution the geogrid application in non-cohesive materials has on the reduction of permanent deformations.

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