concreat crack at base of bmu for mantenance machine

accelerators admixtures agents airentraining alkalisilica ash attack carbonation cement chemical chloride compression concrete corrosion crack cracking curing cycle damage drying epoxies expansion fly freezethaw fume injection joint joints materials moisture patterns plastic polyurethanes reaction reinforcement repair resurfacing retarders sealants sealing shear shrinkage silica slag spacing stress structural sulfate superplasticizers tension thermal vibration