Waste concrete low-temperature heat treatment regenerated active micropowder and preparation method thereof

Abstract

The invention provides a waste concrete low-temperature heat treatment regenerated active micropowder. The waste concrete low-temperature heat treatment regenerated active micropowder is prepared by grinding raw materials including waste concrete cement stone powder, stone powder, a sintering additive, desulfurizing gypsum and an activator. The waste concrete low-temperature heat treatment regenerated active micropowder has the characteristics that the activity is high, the particle size distribution is uniform, and the like; the activity index of the building waste regenerated active micropowder is effectively improved, the initial flowing property of concrete and mortar is improved, the loss amount in flowing duration is reduced, the early mechanic property of concrete is improved, and the obvious economic and environment-protection benefits are realized.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a low-temperature heat treatment regenerated active micropowder of waste concrete and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urban construction process, the extensional real estate development model and large-scale old city renovation have increased the output of construction waste in my country year by year, accounting for 30-50% of the total urban waste. Simple and extensive disposal methods such as stacking and landfilling cannot effectively solve the status quo of the rapid growth of urban waste, and waste natural resources and land resources at the same time. At present, the main technical means of recycling construction waste in China is generally the crushing and grinding regeneration process to prepare recycled coarse and fine aggregates, recycled active micropowder and related recycled con...

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Problems solved by technology

[0003] However, in the waste concrete treatment process of traditional construction waste, it is generally achieved through mechanical crushing and grinding of waste concrete, so jaw crushers, hammer crushers, roller crushers and other crushers will cause some of them to be broken during the treatment process. The stone and sand are mixed into the construction waste cement stone (particle size less than 4.75mm)

Theoretically, cement stone is an effective product of cement hydration, and it can achieve partial rehydration ability through proper process treatment, but some stones and sand mixed in will reduce the activity of waste concrete regeneration active micropowder, and the potential reuse value is insufficient, so it is difficult to Promote application

At the same time, the production of single cement stone regeneration activity treatment technology has high thermal activation temperature and mechanical grinding manufacturing cost, which is not conducive to the energy saving and emission reduction effect advocated by the state

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