Performance of high performance concrete

  • The deformation of the two particles in the material (compression) will not crack; back deformation (tension) will cause cracking, it is inferred that the concrete free shrinkage will not crack, limiting shrinkage will cause cracking; concrete expansion will cause cracking, Expansion does not cause cracking. The relationship between deformation and cracking of concrete determines the expansion intensity of expansive concrete (EC) during hydration hardening. In addition, the expansion of concrete or compensated shrinkage of the concrete only in the restricted conditions of the compensation contraction in order to improve the early strength, improve the density, delay due to shrinkage caused by cracking time, smooth through the early low tensile strength, easy to crack the dangerous period, thus Improve the ability of early crack resistance; the other hand, delay the possible cracking time, so that the concrete strength to further improve, to avoid or reduce the purpose of concrete cracking. The addition of expansion agents gives us a better understanding of high performance concrete, from high-strength concrete to high-performance concrete (HPC) today. HPC is a new type of high-tech concrete, is a substantial increase in the performance of ordinary concrete on the basis of the use of modern concrete technology, the use of high-quality raw materials, in strict quality management made of high quality concrete. It must meet the general performance of ordinary concrete, but also must meet the high strength, high mobility, high volumetric stability, high environmental protection and excellent durability and other requirements. For a brief summary of high-performance expansive concrete: the impact of expansion agent on the strength of high-strength concrete For HPEC, to ensure its expansion and strength of the coordinated development of materials is to achieve excellent performance and performance of the key; another good external conditions But 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. asphalt crack sealing tools variable message road signs rainwater proof rubber gasket seal what is paving in construction