在美国桥面板中新浇灌的砼开裂是一个日益严重的问题.应用K型水泥浇灌的砼是解决这个问题的一个方法.本报告的目的,就是鼓励人们在浇筑桥面板时使用K型水泥的砼,因为已证实这种水泥具有减少收缩裂纹的性能.由于更多的单位在砼桥中使用K型水泥,因此有更多的数据用来评价这种水泥的其他性能,例如减少砼的渗透性.存在问题-开裂今天,当建筑工程规定使用特定的砼时,许多州都使用具有水泥含量高的修正的砼混合料.在一些例子中,这些修正的混合料是由于砼的“D开裂”,或砼的分解而产生的.因为人们认为,砼中大的粗集料,由于它不良的冻融耐久性,是“D开裂”的主要原因,因此粗集料的最大粒径必须降低以符合冻融试验的要求.然而,降低粗集料的粒径 Cracking of newly poured concrete in bridge decks in the United States is a growing problem. One of the solutions to this problem is the application of concrete with K-type cement. The purpose of this report is to encourage people to use Type K cement when pouring bridge deck As concrete has been shown to reduce shrinkage cracking, more data is used to evaluate other properties of this cement as more units use Type K cement in concrete bridges, such as reducing the penetration of concrete Problems Existing - Cracking Many states today use modified concrete mixes with high cement content when the construction practice specifies the use of a particular type of concrete.In some cases, these modified mixes are due to the “D cracking” of the concrete , Or the decomposition of concrete.It is believed that the large coarse aggregates in concrete, due to its poor freeze-thaw durability, are the main cause of “D cracking” and therefore the maximum particle size of the coarse aggregate must be reduced to Meet the freeze-thaw test requirements, however, reduce the coarse aggregate size