For HPEC, to ensure the coordinated development of its expansion and strength is to achieve excellent material performance and performance of the key; another good external conditions also affect the material quality performance factors. In general, if the expansion is premature, although it is conducive to the early formation of the slurry, but at the same time there will be more expansion in the plastic stage, resulting in ineffective expansion, reduce the expansion efficiency; if the expansion efficiency in the structure When the intensity is high, it will lead to a decrease in strength, cracking of the specimen or structure, even under unconstrained or weak constraints. Therefore, the coordinated development of strength and expansion is the key to the design and structure control of expansive concrete materials. In the recommended dosage range (6% -8%), the mortar strength of the expansive agent is slightly lower than that of the reference concrete at 3d and 7d age. When the content is 10%, the strength of the mortar decreases The free expansion and limiting expansion of the mortar increases with the increase in the amount of bulking agent. The smaller the expansion index, the greater the effective expansion energy, the greater the compensation shrinkage. From the results of compressive strength, the compressive strength of the concrete with the expansive agent is obviously reduced at 3d level, and the strength of 28d is obviously increased. Concrete in the absence of no constraints, the expansion of the early structure of the concrete loose, the intensity decreased, but later with the strength of high-strength concrete development, expansion agents continue to play a role, so that the internal structure of concrete dense, no strength of concrete 28d Reduce the effect. road maintenance machinery for sale patching asphalt driveway high tech professional asphalt sealing products portable electronic signs outdoor