Mechanical Properties of an Upgrading Cold-Mix Asphalt Using Waste Materials

Construction and Building Materials

Parry

2016

Nassar, Ahmed I. and Thom, Nicholas and Parry, Tony (2016) Optimizing the mix design of cold bitumen emulsion mixtures using response surface methodology. Construction and Building Materials, 104 . pp. 216-229. ISSN 1879-0526 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/33157/1/First%20paper-%20Construction%20and %20Building%20Materials%20Journal.pdf The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractCold mix asphalt (CMA) has been increasingly recognized as an important alternative worldwide. One of the common types of CMA is cold bitumen emulsion mixture (CBEM). In the present study, the optimization of CBEM has been investigated, to determine optimum proportions to gain suitable levels of both mechanical and volumetric properties. A central composite design (CCD) with response surface methodology (RSM) was applied to optimize the mix design parameters, namely bitumen emulsion content (BEC), pre-wetting water content (PWC) and curing temperature (CT). This work aimed to investigate the interaction effect between these parameters on the mechanical and volumetric properties of CBEMs. The indirect tensile stiffness modulus (ITSM) and indirect tensile strength (ITS) tests were performed to obtain the mechanical response while air voids and dry density were measured to obtain volumetric responses.The results indicate that the interaction of BEC, PWC and CT influences the mechanical properties of CBEM. However, the PWC tended to influence the volumetric properties more significantly than BEC. The individual effects of BEC and PWC are important, rather than simply total fluid content which is used in conventional mix design method. Also, the results show only limited variation in optimum mix design proportions (BEC and PWC) over a range of CT from 10 o C to 30 o C. The variation range for optimum BEC was 0.42% and 0.20% for PWC. Furthermore, the experimental results for the optimum mix design were corresponded well with model predictions. It was concluded that optimization using RSM is an effective approach for mix design of CBEMs.

Section: Indirect Tensile Stiffness Modulussupporting

confidence: 93%

“…The reason for performing the ITS test on conditioned specimens is to take into consideration water damage as a criterion in mix design as recommended by several researchers [1,40]. A similar picture to that in ITSM is presented in Fig.…”

Section: Indirect Tensile Strengthmentioning

confidence: 93%

Optimizing the mix design of cold bitumen emulsion mixtures using response surface methodology

Construction and Building Materials

Parry

2016

“…They stated that the addition of GGBS to bitumen emulsion mixtures can provide better mechanical performance than untreated mixtures, especially in the long term under high humidity curing conditions. Al- Busaltan et al (2012) confirmed the enhancement of close graded CBEM to a stage where its mechanical properties are comparable to those of traditional asphalt concrete mixtures. The improvement was due to replacement of the conventional mineral filler with a domestic fly ash.…”

Section: Introductionsupporting

confidence: 52%

Characterisation of high-performance cold bitumen emulsion mixtures for surface courses

Mohammed

International Journal of Pavement Engineering

et al. 2016

Abstract:Cold bitumen emulsion mixture (CBEM) is not yet widely used as a surface courses around the world. In this study, 0/14 mm size dense graded surface course CBEMs have been investigated. The mechanical performance was evaluated in term s of stiffness modulus over 3 months and resistance to permanent deformation under three different stress levels (100, 200, 300kPa) while durability evaluation was carried out in terms of resistance to moisture and frost damage. The study has also investigated the incorporation of low cement content (1%) with relatively sustainable by-product fillers, namely ground granulated blast-furnace slag (GGBS) and fly ash (FA) type 450-S on both mechanical and durability performance. A comparison has been carried out between the low and high cement content CBEM, as well as with respect to corresponding hot mix asphalt (HMA). The results revealed that the incorporation of GGBS and FA in CBEMs leads to superior performance, similar to CBEMs treated with high cement content and comparable to an equivalent HMA. Furthermore, GGBS replacement exhibited better performance than that of FA replacement. The findings suggest that the new sustainable types of CBEM can be developed for using as a surface layer for medium to heavy trafficked roads.

“…One of the most significant trends towards more eco-friendly asphalt mixes is the use of material such as recycled asphalt pavement, municipal solid waste incineration ash, construction and demolition waste material, cement kiln dust and coal ash [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The development of CAMs has commonly been by utilizing waste material/ by-products while achieving satisfactory hot mix asphalt (HMA) properties [6,7,9,10]. However, CAMs for sustainable and resilient pavements still has to meet the requirements of carrying heavy traffic loads from a mechanical perspective.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, durability and microstructure properties of Cold Asphalt Emulsion Mixtures with different types of filler

Mohammed

Construction and Building Materials

et al. 2016

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe primary aim of this study is to investigate the enhancement of Cold Asphalt Emulsion Mixtures (CAEMs) using binary and ternary blended fillers (BBF and TBF), including an indepth assessment of the microstructure. Ordinary Portland cement (OPC), fly ash (FA) and ground granulated blast furnace slag (GGBS) were used for the BBF while silica fume (SF) was added to the BBF to obtain TBF. The mechanical and durability results indicated that the TBF was more suitable than the BBF for the production of CAEMs. The microstructural assessment indicated that the effect of BBF on the internal microstructure of CAEMs was slightly negative and more noticeable in CAEMs containing FA. It is proposed that the addition of SF to BBF mixtures can eliminate the delay in formation of hydration products caused by the bitumen emulsion. Overall, the research suggests that the use of BBF-CAEMs might be appropriate for pavements in cold climate whereas TBF-CAEMs would be effective in road pavements exposed to severe conditions both in hot and cold climates.