Non-explosive propellants comprised primarily of composite and solid propellants, cartridges, stemming bars, and non-electric and electric shocktube ignites, used for breaking concrete, rock and other solid substrates by generating gas pressure and a rapid high pressure pulse that sets up a tensile stress field in the substrate to be broken

'bar':14 'break':25 'broken':54 'cartridg':12 'composit':8 'compris':5 'concret':26 'electr':18,20 'explos':3 'field':48 'gas':34 'generat':33 'high':39 'ignit':22 'non':2,17 'non-electr':16 'non-explos':1 'pressur':35,40 'primarili':6 'propel':4,11 'puls':41 'rapid':38 'rock':27 'set':43 'shocktub':21 'solid':10,30 'stem':13 'stress':47 'substrat':31,51 'tensil':46 'use':23

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