Preparation and Characterization of Lightweight Wall Materials Based on a Binder Mainly Including Phosphor-gypsum

In this paper, the specimens of phosphor-gypsum (PG) based binder and the specimens of its lightweight mortar (LM), further the specimens of its lightweight wall materials (LWM) were prepared using original PG, straw powder (SP), expanded perlite (EP) and expanded polystyrene particles (EPP) as raw materials. Moreover the properties of the specimens were investigated systematically. In the preparation and characterization of the specimens of PG based binder with fixed PG content being 50 wt.%, and the remains of it being Portland cement, blast furnace slag, and fly ash, the specimen with 15 wt.% fly ash has the largest values of flexural and compressive strengths among the binder specimens prepared, and all the binder specimens have the promising softening coefficient more than 0.88. For the LM specimens consisted of PG based binder and SP, their softening coefficient are ≥ 0.89 as the adding content of SP is ≤ 30 vol.%. For the LWM specimens consisted of PG based binder, SP, EP and EPP, the bulk density and thermal conducting coefficient are slightly decreased with the increase of EP and EPP contents, respectively. The LWM specimen with 50 vol.% EPP has the promising comprehensive properties.