Surface modifier of concrete aggregate and its use

Abstract

The surface modifier for concrete aggregate consists of inorganic sulfate coagulating agent 0.06-0.1 wt%, inorganic sulfate coagulant 1.25-2 wt%, and organic sodium methyl silicate 2.5-4 wt%. The surface modifier can lower the water absorption of high hydroscopicity aggregate, with includes regenerated aggregate, artificial light aggregate, etc. The surface modifier may be sprayed or soaked onto high hydroscopicity aggregate for surface modification, and has low cost, no pollution and high surface modifying effect.

Description

technical field [0001] The invention relates to a surface modifier of concrete aggregate and its application, in particular to a surface modifier of superabsorbent concrete aggregate and its application. Background technique [0002] Although concrete materials have a long service life, concrete structures and buildings will eventually have to be demolished for various reasons after a period of use, resulting in a large number of waste concrete blocks. On the other hand, with the development of social economy and the increase of concrete consumption, the contradiction between the sustainable development of concrete and aggregate supply and demand has become increasingly prominent. Therefore, if waste concrete can be recycled and reused on site, it will not only reduce costs, save natural aggregate resources, alleviate the contradiction between supply and demand, but also reduce urban environmental pollution. [0003] Recycled aggregates from demolished buildings have been u...

AI Technical Summary

Problems solved by technology

Although this can effectively eliminate the impact of aggregate water absorption on the configuration of concrete, there are two major disadvantages of this method: First, the pre-wet effect is not easy to control, usually pre-wet highly water-absorbent concrete aggregate There is a lot of water on the surface, and the pre-wet aggregate is difficult to achieve a saturated state, which will cause the actual water-cement ratio in the concrete to be higher than the design water-cement ratio, which will reduce the mechanical properties and durability of the concrete

Second, the pre-wetting process is cumbersome, which takes up space and is not conducive to efficient concrete construction

The high water absorption of recycled aggregates makes it difficult to control the quality of concrete

Therefore, the pre-wetting process is a time-consuming and inefficient process in the concrete production process.

This is a very unfavorable factor for the promotion and use of recycled concrete