The invention provides a method for detecting the strength of a soil-
cement admixture by using a
hardness test. The method comprises the following steps: acquiring soil samples from a variety of soil
layers within on-site construction depth; carrying out
sample preparation on the on-site soil samples and
cement and then carrying out a
hardness test and a lateral confinement-free
compressive strength indoor test; collating
hardness values of
soil cement test pieces obtained in the test and corresponding lateral confinement-free
compressive strength values and drafting a graph of relation; subjecting the graph of relation to linear-
regression analysis to obtain a relation between the hardness values of
soil cement at the construction site and natural logarithm values of confinement-free
compressive strength; during reinforcing and maintenance of on-site construction
soil cement, digging out the surface of a few reinforcing sections to
expose the soil
cement, testing hardness of the soil cement with a
Shore durometer and calculating a confinement-free compressive strength value by directly using the
linear regression relation obtained through the tests. According to the invention, destroy of reinforced soil and
delay of a construction period caused by boring and sampling of the reinforced soil after reinforcement construction are avoided, and the method is concise, economic, effective and fast.