Composite graphene high-strength construction waste cement mortar and preparation method thereof

Abstract

The invention discloses composite graphene high-strength construction waste cement mortar and a preparation method thereof, the composite graphene high-strength construction waste cement mortar is prepared by mixing construction waste and standard sand as aggregate, using graphene oxide as a modifier, and then adding a polycarboxylate superplasticizer, cement and water. The performance indexes ofthe cement mortar disclosed by the invention meet the requirements that the 28-day standard compressive strength is 57.6 MPa, and the breaking strength is 9.03 MPa (tested according to GB/T17617-1999and JGJ/T70-2009); the mass loss and the strength loss of 150 times of anti-freezing cycles are both less than 5% (according to GB/T50476-2008 test); and the Cl<-> content in the product is 0.0067%, and the IRa is 0.08, and the Ir is 0.15 (tested according to GB6566-2010).

Description

technical field [0001] The invention belongs to the field of new environment-friendly building materials, and in particular relates to a composite graphene high-strength construction waste cement mortar and a preparation method thereof. Background technique [0002] The demand for building materials increases due to urbanization, and natural resources are facing a shortage. With the deepening of mining depth, excavation of mountains and rocks leads to an increase in the incidence of accidents, which seriously affects the health of workers and the smooth progress of mining work. As the process of urbanization continues to accelerate, the demolition of old buildings, the renovation of houses and the construction of new buildings will generate a large amount of construction waste. Today, the continuously increasing output of construction waste has reached 30% to 40% of urban waste, while the utilization rate of construction waste in my country is less than 5%. If a large amoun...

AI Technical Summary

Problems solved by technology

Today, the continuously increasing output of construction waste has reached 30% to 40% of urban waste, while the utilization rate of construction waste in my country is less than 5%.

There are many unavoidable shortcomings in recycled fine aggregate, such as the uncertainty of composition and large apparent density, high bulk density, high water absorption, large crushing index, and a large number of microcracks on the surface, which will cause recycled fine aggregate Difficult to use in the concrete industry

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