UEA: U-type expansive agent, English name U-type expansive agent for concrete, abbreviated as United Expansing Agent, referred to as UEA, is made of aluminum sulfate, aluminum oxide, potassium aluminum sulfate, etc. As the main source of expansion. In the early stage, anhydrous aluminum calcium sulfate was mainly used as the expansion source, and in the middle stage, alunite was mainly used as the expansion source, and the expansion effect was stable. Ordinary concrete often leaks due to shrinkage and cracking, thus reducing its use function and durability. Adding a certain amount of UEA into ordinary concrete, the compressive stress generated by expansive crystal hydrate squeezes cement hydrated ettringite to form micro-expansive concrete, which makes the expansive force generated during curing compact the expansive concrete. 1986 successfully developed UEA-H expansion agent, 1993 developed low-alkali expansion agent, 1994 popularized. 1994 The Ministry of Construction listed UEA-H as a key promotion project. By adjusting the formula, the alkalinity is reduced, the alkali-aggregate reaction of cement products is avoided, and the properties of cement products are optimized. Product implementation standard: JC476-2009. Building materials technology has made great contributions!
Differentially speaking, I have never used SY-G, but the expansion effect of UEA is average.