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.
Highlights
Cement emulsified asphalt paste (CEAP) is widely used as a construction and building material, which has the rigidity of cement-based materials and flexibility of asphalt-based materials [1,2,3]. e addition of emulsified asphalt into cement can significantly improve many properties of cement material, such as rheological performance and elasticity [4, 5]
Mechanical Property Tests. e specimens with sizes of 40 mm × 40 mm × 160 mm were prepared for strength tests, such as flexural strength and compressive strength. e flexural strength and compressive strength of CEAP were tested according to Method of Testing Cements-Determination of Strength (GB/T17671-1999). e flexural strength and the compressive strength of CEAP were tested three times and six times, respectively, and the average value was adopted as the test result
Erefore, the adsorption between cement and asphalt can be characterized by testing the viscosity of the paste. e adsorptions between cement and asphalt with different graphene oxide (GO) dosages can be reflected by the viscosity of CEAP
Summary
Cement emulsified asphalt paste (CEAP) is widely used as a construction and building material, which has the rigidity of cement-based materials and flexibility of asphalt-based materials [1,2,3]. e addition of emulsified asphalt into cement can significantly improve many properties of cement material, such as rheological performance and elasticity [4, 5]. E addition of emulsified asphalt into cement can significantly improve many properties of cement material, such as rheological performance and elasticity [4, 5]. The addition of emulsified asphalt can affect the cement hydration process and decrease the mechanical strength of mixtures [6,7,8,9]. The main improvement technique is to add reinforcing materials, such as rebar, reinforcing fibers and inorganic binders, and slag powder. Graphene oxide (GO) is an oxide of graphene and it is usually in the form of a solution, powder, or flake [10,11,12]. GO can evenly disperse in aqueous solution due to the electrostatic repulsion between functional groups [14, 15]
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