Density enhancement methods and compositions

A system comprising:

• a) a reservoir containing granular composite positioned adjacent to a target surface said granular composite comprising a disordered, flowable, powder or suspension of at least two groups of particles of different average volumes, where
• i) the average volume of the larger of two groups adjacent by average volume is no more than 10,000 times the average volume of the other group,
• ii) where the dividing volume between at least two adjacent groups is a smallest minimum point in a passing curve or similar size distribution representative of the composite, and where the value of the passing curve or similar size distribution at the smallest minimum point between the two groups is no greater than 75% of the value of the passing curve or similar size distribution at the largest maximum of either of the two groups,
• iii) where on average, particles from the group of larger particles contact at least one other particle from the same group,
• iv) the groups of particles do not spatially phase separate during application to the target surface, and
• v) the mixing of the smaller particles with the larger particles results in a greater volume of space being occupied by the mixture than was occupied by the larger particles alone and
• b) an energy source positioned to transfer energy to said composite when applied on said target surface.