High-activity crystal seed for concrete production and preparation method thereof

Abstract

The invention relates to a high-activity crystal seed for concrete production and a preparation method thereof. The crystal seed is prepared by microwave strengthened calcination of the following components in percentage by weight: 70-90 percent of waste ceramic powder, 10-30 percent of pregrinded carbide slag powder and 2-5 percent of modified additive. The preparation method comprises the stepsof: taking the components and mixing and grinding according to the proportion, and adding the modified additive in the mixing and grinding process; mixing and grinding until the Brinell specific surface area is 350-400m<2> / kg, homogenizing and placing into an electric heating furnace; and after heating to 800-1,000 DEG C, immediately transferring to a microwave oven with power 600-800W, heating for 90-120 seconds by microwaves and then grinding to 400-450m<2> / kg by adopting vibration grinding. The crystal seed can rapidly promote early hydration of a cement and mineral mixture, obvious improves the early strength of concrete, has good transitive ductility of later strength, no adverse effect on durability and obvious technical, economic and social environmental protection benefit and resource and energy saving.

Description

technical field [0001] The invention belongs to building materials, and in particular relates to a highly active crystal seed used in concrete production and a preparation method thereof. Background technique [0002] As we all know, crystal seeds have the following functions in concrete. On the one hand, it can reduce the nucleation barrier of hydration products in the early stage of cement hydration, induce rapid hydration of cement, thereby improving the early strength of concrete and speeding up the construction progress of concrete projects, etc.; On the one hand, because the early hydration of cement is accelerated, the alkalinity of the material system is increased, which can provide mineral admixtures (such as slag, fly ash, etc.) with more favorable activity to stimulate external environmental conditions, thereby improving the mineral admixture The early hydration rate of the admixture compensates for the decrease in the early strength of the high-volume mineral adm...

AI Technical Summary

Problems solved by technology

However, it may lead to two problems: if the time interval between production and application is short, it will easily lead to phenomena such as instant setting and rapid setting of concrete, which will cause poor initial structure of concrete, poor durability, and poor post-strength extension. Poor; if the time interval between production and application is long, it is not easy to preserve, and is susceptible to carbonization, dehydration, etc., which partially weakens the effect of crystal seeds on improving the early hydration performance of cement and mineral admixtures

However, this technology is mainly a traditional preparation technology that uses high-quality materials such as limestone and silicon to burn seeds at a high temperature of about 1450 ° C. The one-time resource consumption is large and energy consumption is high, which is not suitable for building materials. Industrial Sustainable Development Strategy

Images