A kind of steel slag curing agent and steel slag pavement base material prepared by using it

Abstract

The invention discloses a granular solidifying agent, which is a powdery agent made of gypsum powder, alkaline catalyst, silica fume, early expansion agent, magnesium oxide and calcium chloride as main raw materials. In the present invention, steel slag is used as aggregates such as river sand and gravel, and the fine-grained soil is completely replaced to prepare pavement base material, and the steel slag is solidified by using CSH gel formed by hydration of cement, steel slag and activator, and the hydration product containing aluminum phase Hexavalent chromium and nickel and other heavy metals in the solution to solve the problem of heavy metal pollution. The granular curing agent is applied to the preparation of pavement base materials, which has excellent mechanical properties, water resistance stability, crack resistance and durability, and has excellent energy saving and environmental protection characteristics, which can effectively reduce engineering costs and can also be widely used It is suitable for road base, soft ground treatment and other fields, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a steel slag curing agent and a steel slag pavement base material prepared by using the same. Background technique [0002] Cement is the most important cementing phase in traditional cement-stabilized soils. Cement hydration is difficult to directly bond steel slag particles at room temperature. When applied to pavement bases, there are problems such as low strength, poor water stability, large shrinkage, and easy cracking. Traditional cement soil usually needs to introduce clay characteristics such as fine-grained soil, and there are problems such as the need for additional excavation and soil resources. As industrial waste, steel slag is an industrial waste. Trying to use it as aggregate and completely replace fine-grained soil at the same time has important industrial significance. prospect. [0003] At present, steel slag is usually used as roadbed filler, and ...

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Problems solved by technology

[0003] At present, steel slag is usually used as roadbed filler, and due to the low activity of steel slag itself, the amount of steel slag in building materials is also low, and the purpose of using steel slag in large quantities cannot be achieved.

The main problems affecting the application of steel slag in the building materials industry include: 1) The problem of hydraulic activity; the content of silicate minerals and iron-aluminate minerals with relatively high activity in steel slag is relatively small, accounting for only 40-70% of cement clinker ; 2) Problems with processing technology; the processing technology of steel slag has a great influence on its mineral composition and hydraulic activity. The steel slag with the same chemical composition has different processing technology, and its mineral composition and hydraulic activity also have large differences; Steel mills mostly adopt wet treatment processes. These wet processes such as water quenching and slag stewing not only make the slag after treatment low in activity, poor in quality, and difficult to use, but also cause waste of water resources, environmental pollution and a large amount of heat energy consumption. 3) Cement is the most important cementing phase in traditional cement-stabilized soil, and it is difficult for cement hydration to directly cement soil particles and construction waste at room temperature, so it is applied to pavement bases There is low strength, which cannot meet the load-bearing use of the pavement base

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