The engineering properties of newly hydraulic reclamation mud in liquid state are poor. Their bearing capacity is almost zero. After it is improved with vacuum preloading technology (VPT)

its soil strength increases only a little and its effective depth is very small. A new idea of vacuum preloading combined with nonpolluting chemical reinforcement technology (VPCT) is proposed. Three kinds of vacuum preloading combined with chemical reinforcement technologies (VPCT1

VPCT2 &VPCT3) and one kind of chemical improvement technology (CT) are compared with VPT in laboratory tests. The test results show that: (1) when the effective chemical agent adding

the deposition of newly hydraulic reclamation mud finishes after a short standing time before vacuum preloading; (2) the effective chemical agent can promote the improvement effect; (3) in macrocosmic aspects

the mud of VPCT3 has uniform improvement

the clay content obviously decreases

the wet density is the biggest

the void ratio obviously decreases

and the unconfined compression strength is the biggest (66.7 kPa) which is 3.5 times that of VPT; (4) in microcosmic aspects

the mud of VPCT3 has the smallest total region (void) area

average perimeter

region(void) number

void ratio

porosity

and has good directionality

intimate contact with mainly surface-to-surface connection

and has most noticeable agglomerate phenomenon. Therefore

comparing with VPT

VPCT3 has the best effect for improving the mud. It is advisable & necessary that VPCT3 is further researched in field trial.