Property Improvement of Cement Emulsified Asphalt Paste Modified by Graphene Oxide

Abstract

Cement emulsified asphalt paste (CEAP) is widely used as a construction and building material by combining the advantages of cement rigidity and asphalt flexibility. However, the properties of CEAP can be evidently reduced due to the addition of emulsified asphalt. In this work, graphene oxide (GO) was prepared by the Hummers method and was innovatively used to improve the workability and strength of CEAP. The viscosity of CEAP was tested by Brookfield viscometer. In addition, the effects of GO on the setting time of CEAP were studied. The adsorption between cement and asphalt with GO was tested through an ultraviolet-visible spectrophotometer and the stability of CEAP was tested by zeta potentiometer. The effects of GO on the strength of CEAP were studied. The reinforcement effects of GO on CEAP were analyzed. The results show that the viscosity of CEAP and cement hydration products can increase after adding a reasonable dosage of GO to CEAP. The setting time of CEAP first decreases and then increases with the increase of GO dosage. The adsorption and viscosity of cement and asphalt increase with the increase of GO dosage. GO can reduce CEAP stability and make the paste easier to agglomerate. The flexural strength and the compressive strength of CEAP at 28 curing days first increase and then decrease with the increase of GO dosage, but excessive GO can hinder cement hydration. The reasonable dosage of GO in CEAP can be determined as 0.06% in asphalt weight.

Effect of Graphene Oxide on the Low-Temperature Crack Resistance of Polyurethane–SBS-Modified Asphalt and Asphalt Mixtures

“…Graphene oxide (GO) is a single atomic layer formed by the oxidation of graphite, with a unique quasi-dimensional layered structure, excellent oxygen barrier, and good intersolubility with organic solvents, gaining attention as a new modifier for asphalt [ 6 , 7 , 8 ]. Research in recent years has found that graphene oxide as a modifier can improve the elastic response and road performance of the asphalt matrix, forming a more stable molecular structure [ 9 , 10 ]. In addition, the cost of nanomaterials has shown a decreasing trend, and with improvements in manufacturing technology, their costs are likely to decrease further [ 11 ].…”

Effect of Graphene Oxide on Liquid Water-Based Waterproofing Bituminous Membranes

“…This work is the first time that, to the best of our knowledge, small quantities of multilayer GO were used to produce high-performing liquid bituminous membranes with a waterproofing function. A low GO concentration was selected according to the literature [ 43 , 44 ] in order to have a low impact on production cost and, thus, to be competitive in the target market. Therefore, this study aimed to analyze the effect of the low graphene oxide concentration on the mechanical resistance of the produced membrane, how the GO doping impacts the barrier properties, and its properties as an anti-aging agent.…”

Research on Design and Performance of Self-Compacting Cement Emulsified Bitumen Mixture (CEBM)

“…To compensate for the disadvantages of the above conventional materials in terms of construction technology, economy, environmental protection, and road performance, the use of a new bitumen/cement composite stabilized mixture with early-strength, self-compacting, and room-temperature construction characteristics (CEBM) for road maintenance is proposed, which may have adequate applications for repairing potholes in the asphalt pavement quickly and conveniently. Using sulphoaluminate fast-hardening cement and emulsified bitumen as the composite binders for CEBM can not only achieve the rigidity [ 34 ] enabled by cement but also meet the load-bearing capacity and improve high-temperature anti-rutting. The bitumen also has the flexibility [ 35 ] to meet the requirements of low-temperature cracking resistance and medium-temperature fatigue resistance [ 36 ].…”