The lightweight aggregate concrete (LAC) specimens were prepared by chemical foaming in situ, the sludge expanded ceramsite, hydroxy propyl methyl cellulose (HPMC), H2O2, and expanded perlite were used as the aggregate, foam stabilizer, chemical foaming agent (CFA), and carrier for CFA, respectively. The results showed that HPMC content in the range of 0.05%~0.125%(?) had the promising performance of foam stabilization and anti-segregation for the preparation of LAC. Accompanying to the slight increase of bulk density of resulting LAC specimens, the 28 d curing compressive strength, the flexural strength and the thermal conducting coefficient were increased, whereas the 48 h water absorption was decreased with the increase of HPMC content. For HPMC in the range of 0.125%~0.15%(?), the properties of resulting LAC specimens were changed with the variation of HPMC content conversely as compared with that in the range of 0.05%~0.125%(?), the slump of fresh LAC specimens was decreased slightly. For the resulting LAC specimen with HPMC content of 0.125%(?), the bulk density was 1245 kg/m3, the 28 d curing compressive strength was 31 MPa, the 28 d curing flexural strength was 6 MPa, the 48 h water absorption was 6.1%, and thermal conducting coefficient was 0.33 W/(m?K), respectively.