Anti-cracking agent for pavement base material in seasonal frozen areas and preparation method thereof

The invention provides an anti-cracking agent for a pavement base material in seasonal frozen areas and a preparation method of the anti-cracking agent. The anti-cracking agent comprises 40%-60% of fly ash; 8%-15% of gypsum; 30%-45% of mineral ash and slag; 0.1%-0.5% of organic fibers; 1%-5% of an activator; wherein the sum of the contents is 100% based on the total mass of the anti-cracking agent. The anti-cracking agent disclosed by the invention can effectively compensate cracking caused by shrinkage of a pavement base layer through interaction of all the components. The anti-cracking agentis added into road base stable granules, and the pavement base material prepared by adding the anti-cracking agent can further improve the mechanical property, durability and other properties of thematerial and effectively compensate and reduce shrinkage cracking of the pavement base layer. The invention provides an effective way for reducing pavement base cracking in a seasonal frozen region with low humidity, large tem