Effects on engineering properties of cement-treated road base with slow setting bitumen emulsion

2015 ◽  
Vol 18 (3) ◽  
pp. 202-215 ◽  
Author(s):  
Mojtaba Shojaei Baghini ◽  
Amiruddin Bin Ismail ◽  
Mohamed Rehan Bin Karim ◽  
Foad Shokri ◽  
Ali Asghar Firoozi
Keyword(s):  
Engineering Properties ◽  
Road Base ◽  
Bitumen Emulsion

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.

Evaluation of Durability and Permanent Deformation of Modified Road Base Construction Using Rovene® 4045 and Portland Cement Additives

2015 ◽  
Vol 1089 ◽  
pp. 228-234
Author(s):  
Mojtaba Shojaei Baghini ◽  
Amiruddin Ismail ◽  
Mohamad Rehan bin Karim
Keyword(s):  
Portland Cement ◽  
Permanent Deformation ◽  
Engineering Properties ◽  
Weight Changes ◽  
Permanent Strain ◽  
Road Base ◽  
Strain Behaviour ◽  
Wheel Tracking ◽  
Styrene Butadiene

Due to lack of previous study on applying polymer additives in road base construction, this research presents experimental results on the improvement of long-term road base performance by the addition of carboxylated styrene–butadiene emulsion (Rovene® 4045) and Portland cement. The specimens stabilized with Portland cement (0–6%) and Rovene® 4045 (5–10%) and then subjected to different stress sequences to study the wetting and drying (WD) and wheel tracking (WT) tests on the 7-day-cured specimens. Results of tests conducted to assess the specimens’ resistance to WD cycling showed that the addition of a 4% Portland cement–7% Rovene® 4045 mixture resulted in reductions of 86.99% in water absorption, volume changes of 88.55%, and weight changes of 92.84% relative to a sample with only 4% cement after 12 WD cycles. The permanent strain behaviour of the samples was assessed by the WT test. The results of WT test showed that the permanent deformation characteristics of the mixture were considerably improved by utilization of Rovene® 4045 modification, which resulted in reductions of 218.9% at 25 oC, and 356.8% at 50 oC in permanent strain of the mixture respectively. Therefore, this research nominates a new polymer additive having outstanding engineering properties and environmental friendly.

scholarly journals Freeze-Thaw Performance and Moisture-Induced Damage Resistance of Base Course Stabilized with Slow Setting Bitumen Emulsion-Portland Cement Additives

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mojtaba Shojaei Baghini ◽  
Amiruddin Ismail
Keyword(s):  
Portland Cement ◽  
Soil Aggregates ◽  
Moisture Damage ◽  
Engineering Properties ◽  
Freezing And Thawing ◽  
Freeze Thaw ◽  
Weight Losses ◽  
Bitumen Emulsion ◽  
Geotechnical Characteristics

Freeze-thaw (FT) cycles and moisture susceptibility are important factors influencing the geotechnical characteristics of soil-aggregates. Given the lack of published information on the behavior of cement-bitumen emulsion-treated base (CBETB) under environmental conditions, especially freezing and thawing, this study investigated the effects of these additives on the CBETB performance. The primary goal was to evaluate the resistance of CBETB to moisture damage by performing FT, Marshall conditioning, and AASHTO T-283 tests and to evaluate the long-term stripping susceptibility of CBETB while also predicting the liquid antistripping additives to assess the mixture’s durability and workability. Specimens were stabilized with Portland cement (0%–6%), bitumen emulsion (0%–5%), and Portland cement-bitumen emulsion mixtures and cured for 7 days, and their short- and long-term performances were studied. Evaluation results of both the Marshall stability ratio and the tensile strength ratio show that the additions of additives increase the resistance of the mixtures to moisture damage. Results of durability tests performed for determining the resistance of compacted specimens to repeated FT cycles indicate that the specimen with the 4% cement-3% bitumen emulsion mixture significantly improves water absorption, volume changes, and weight losses. This indicates the effectiveness of this additive as a road base stabilizer with excellent engineering properties for cold regions.

scholarly journals Engineering Properties of Soil Stabilized by Ferrum Lime and Used for the Application of Road Base

1999 ◽  
Vol 39 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Masashi Kamon ◽  
Huanda Gu ◽  
Takeshi Katsumi
Keyword(s):  
Engineering Properties ◽  
Road Base ◽  
Properties Of Soil

scholarly journals The influence of laboratory compaction methods on the physical and mechanical properties of foamed bitumen recycled mixes

2014 ◽  
Vol 13 (1) ◽  
pp. 053-062
Author(s):  
Marek Iwański ◽  
Anna Chomicz-Kowalska ◽  
Piotr Ramiączek ◽  
Krzysztof Maciejewski ◽  
Mateusz Iwański
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Moisture Damage ◽  
Hydraulic Press ◽  
Compaction Process ◽  
Road Base ◽  
Bitumen Emulsion ◽  
Foamed Bitumen ◽  
The Impact ◽  
Compaction Method

This study attempts to evaluate the influence of two advisable methods for compacting laboratory specimens of road base recycled mixes with foamed bitumen (MCAS) and bitumen emulsion (MCE). The obligatory regulations for this technology permit fabrication of the specimens using either an impact Marshall compactor or a static hydraulic press. The research showed that the compaction method influenced both the physical and mechanical properties of samples regardless of the type of bitumen binder. What is more, the structure of the material changed after the impact compaction process, which manifested in fact that many of the aggregate particles were crushed in its course. Better strength and resistance to moisture damage was observed in samples prepared in the hydraulic press. This was associated with lower void contents obtained in this compaction method.

scholarly journals Modification of Lime-Fly Ash-Crushed Stone with Phosphogypsum for Road Base

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Hao Zhang ◽  
Yuan Cheng ◽  
Lei Yang ◽  
Weikang Song
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Base Material ◽  
Engineering Properties ◽  
Crushed Stone ◽  
Fine Aggregate ◽  
The Road ◽  
Road Base ◽  
Shrinkage Cracks ◽  
Phosphogypsum Waste

In order to increase the recycling of phosphogypsum waste, this study explored the feasibility of using phosphogypsum to replace some of the lime and aggregate in the lime-fly ash-crushed stone mixture which is a widely used road base material in China. For this purpose, compaction, compressive strength, composition structures, wetting-drying cycle tests, and shrinkage tests were carried out on the lime-fly ash-phosphogypsum-crushed stone composite to investigate its performance. The results indicate that lime-fly ash-crushed stone modified with phosphogypsum has the required strength of the road base material and favourable performances in environment (wetting-drying cycle) stability. The image processing analysis and shrinkage tests demonstrated that phosphogypsum can significantly improve the compactness and shrinkage performance of lime-fly ash-crushed stone mixture. A suitable content of phosphogypsum and a reasonable content of fine aggregate are conducive to improving the roadway engineering properties (i.e., decreasing shrinkage cracks and increasing compressive strength) of lime-fly ash-phosphogypsum-crushed stone composites.

The Potentials of Portland Cement and Bitumen Emulsion Mixture on Soil Stabilization in Road Base Construction

2013 ◽  
Vol 65 (2) ◽  
Author(s):  
Mojtaba Shojaei Baghini ◽  
Amiruddin Ismail ◽  
Behnam Kheradmand ◽  
Mohamad Hesam Hafezi ◽  
Ramez Alezzi Almansob
Keyword(s):  
Portland Cement ◽  
Soil Stabilization ◽  
Road Base ◽  
Bitumen Emulsion

scholarly journals Laboratory Mix Design of Cold Bitumen Emulsion Mixtures Incorporating Reclaimed Asphalt and Virgin Aggregates

Buildings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 177 ◽  
Author(s):  
Kiplagat Chelelgo ◽  
Zachary C. Abiero Gariy ◽  
Stanley Muse Shitote
Keyword(s):  
Tensile Strength ◽  
Moisture Absorption ◽  
Binder Content ◽  
Engineering Properties ◽  
Strength Ratio ◽  
Reclaimed Asphalt ◽  
Air Voids ◽  
Bitumen Emulsion ◽  
Asphalt Mix ◽  
Indirect Tensile

Bitumen emulsion asphalts, especially those incorporating marginal and secondary aggregates, are energy efficient, environment friendly, and sustainable alternatives to hot-mix asphalts. This study set out to compare engineering properties of a bitumen emulsion asphalt composed entirely of virgin aggregates with another composed of 55% reclaimed asphalt and 45% virgin aggregates. The aggregates were bound with a slow setting cationic bitumen emulsion composed of 65% base bitumen and 35% water. Marshall specimens molded at varying pre-mix water and bitumen emulsion contents were cured in molds for 24 h before being de-molded and cured for a further 72 h at 40 °C. Dry densities, porosities, and indirect tensile strengths for the cured specimens were determined in dry and soaked states. Virgin aggregate mix, at an optimum binder content of 6.1%, had a tensile strength ratio of 1.3 with corresponding air voids and moisture absorption values of 10.1% and 0.92%, respectively. Similarly, reclaimed asphalt mix at an optimum binder content of 6.2% had a tensile strength ratio of 1.03, with corresponding air voids and moisture absorption values of 7.9% and 0.38%, respectively. Compared to virgin mix, reclaimed asphalt mix had lower air voids and lower moisture absorption values with the overall benefit of enhanced resistance to moisture damage.

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