Borosilicate glass (BSG) bonded composites of Sr-chloroapatite (SrApCl) and its simulated pyrochemical waste loaded compositions were synthesized by solid state reaction route. These compositions were characterized by XRD and SEM. Percentage (%) thermal expansion of the composites was measured by high temperature XRD (HT-XRD) and dilatometry. 10-16 wt.% waste loaded composites show minor variations in % linear expansion at 298-900 K. The composite with 10 wt.% waste loading and without BSG encapsulation exhibited slightly higher % of expansion compared to other compositions above 700 K. The coefficient of thermal expansion (alpha(m)) measured by HTXRD and dilatometry are found to be of the same order of magnitude. The % expansion measured by dilatometry shows higher values for waste loaded compositions compared to SrApCl; whereas values measured by HTXRD show a decreasing trend with respect to pristine SrApCI. The instantaneous coefficient of thermal expansion (alpha(i)) is used to determine the glass transition temperature (T-g) of the glass-bonded composites from the dilatometry data. The alpha(i) measured by HTXRD for the composites ranges from 2.40(1) x 10(-7) to 9.51(2) x 10(-8) K-1 along a-axis, 9.28(1) x 10(-8) to 7.68(1) x 10(-6) K-1 along c-axis and alpha(m) measured by dilatometry ranges from 3.80(1) x 10(-7) to 13.14(1) x 10(-6) K-1. (C) 2015 Published by Elsevier B.V.