水泥生料组分混凝土设计理论及试验研究

以混凝土材料的可循环利用为目标,提出了全新的水泥生料组分混凝土的概念,并研究了水泥生料组分混凝土的配合比设计方法--在配合比设计中引入硅砂率和钙砂率的概念,将混凝土的配合比设计与水泥生产的三率值联系起来,使混凝土的化学成分与水泥生料相同,进而在废弃后可直接作为水泥生料,无需或只需添加少量校正原料.试验表明:相同配比的水泥生料组分混凝土,除流动劣于普通河砂混凝土外,其他力学性能均优于河砂混凝土;废弃后的水泥生料组分混凝土氧化物成分与设计水泥生料基本一致.水泥生料组分混凝土概念的提出解决了废弃混凝土的再生回收利用率低、造价高的问题,同时避免了水泥生产中对天然矿物的过度开采和空气污染问题.

Theoretical and experimental studies on CCRM concrete

In order to realize the recycle use of concrete,the concept of concrete designed by the constituents of cement raw material(CCRM concrete for short) is put forward and the mix design method of this concrete is provided.In the mix design,sand percentage is divided into two parts,nature sand percentage and manufactured limestone sand percentage,and then the mix design of concrete is contacted with the three ratios of cement clinker,which make the oxide constituents of concrete to be similar to those of the cement raw material.After the concrete is abandoned,it can be directly used as cement raw material but not need or just need little materials to adjust the constituents.The experiments show that the workability of the CCRM concrete is lower than that of the corresponding normal concrete,but its mechanical properties are all better;the ratio of the abandoned CCRM concrete is similar to that of the cement raw material which has been designed before the concrete design.The concrete designed by the constituents of cement raw material resolves the problem of the recycle use of the concrete,and at the same time reduces the excessive exploitation of natural resources and the air pollution.