【正文】 loads. Poisson recycled concrete is usually in the range of ~. 3) pared to recycled concrete and natural aggregate concrete, the dry shrinkage and creep increased by an average of about 60%. Dry shrinkage increases depends on the matrix properties of concrete, recycled aggregate and recycled concrete than with the quality. Have a certain influence the popularization and application of shrinkage and CSU Biennia Conference on recycled concrete, this will make the recycled concrete structure produce more non loading cracks, if cracks through the inside and outside environment, water and other harmful substances can easily perate into concrete, is disadvantageous to the durability of structures. But such as the use of recycled aggregate is low water cement ratio and high strength, test results show, can reduce the recycled concrete shrinkage and creep. Therefore, for the promotion of recycled concrete, it can be used in structural concrete, need further study to improve the strength of recycled concrete way, reducing shrinkage and creep method of recycled concrete, micro structure and failure mechanism of recycled concrete. 5 Conclusion Expansive cement invention has been 70 years of history, the history of the application of shrinkage pensating concrete is also 50 years, from the day of its birth, its location is a kind of special concrete anti seepage, and formed a set of more perfect theory system. Engineering practice that, the shrinkage pensating concrete anti cracking performance is excellent, and is an ideal concrete structure from waterproof materials, shrinkage pensating concrete underground buildings, can be pletely canceled waterproof, not only shorten the construction period, but also save the engineering cost, waterproof life and buildings. In recent years, the rapid development of concrete technology, especially the application of high performance concrete is being more and more widely, put forward higher requirements on the shrinkage pensating concrete shrinkage pensation theory, the urgent need to have the new breakthrough, instructional materials, design, construction and inspection method innovation. Can be expected in a fairly long period of time, the technical field of concrete may not be new technology to replace the shrinkage pensating concrete, so in order to improve the performance of shrinkage pensating concrete cracks, relief has broad prospects for development, but the need to keep pace with the times, innovation. 譯文 ： 再生改性混凝土的性能 摘 要 ：拆除原有的建筑物，對(duì)廢棄的混凝土加以利用，既可以保護(hù)環(huán)境又關(guān)系到建筑的可持續(xù)發(fā)展。有效、合理地利用有限的資源是實(shí)現(xiàn)可持續(xù)發(fā)展的首要途徑。 2 國(guó)際上 再生混凝土發(fā)展?fàn)顩r 將廢棄混凝土塊經(jīng)破碎、分級(jí)并按一定的比例混合后形成的骨料稱為再生骨料或再生混凝土骨料 。 20世紀(jì) 90 年代初，歐共體國(guó)家每年產(chǎn)出廢棄混凝土為 5000 萬(wàn)噸，美國(guó)為 6000 萬(wàn)噸，日本約 1200 萬(wàn)噸。 3 補(bǔ)償收縮改性混凝土的組成 普通混凝土是用途極廣的建筑材料，但是由于它的極限延伸率較低，在干縮、徐變、溫度等作用下容 易開裂， 導(dǎo)致混凝土工程滲漏并引發(fā)鋼筋銹蝕，影響構(gòu)筑物的使用功能和壽命。 Al2O3 4 補(bǔ)償收縮改性混凝土的基本性能 材料性能 混凝土硬化前的性質(zhì) 膨脹劑摻量與新拌混凝土初始坍落度的關(guān)系：膨脹劑對(duì)新拌混凝土初始坍落度的影響，很大程度上決定于膨脹劑的細(xì)度，當(dāng)膨脹劑的細(xì)度與水泥相差不大 時(shí)，拌合需水量也基本相同，對(duì)初始坍落度基本沒有影響。 5%)中養(yǎng)護(hù)時(shí)，也發(fā)生收縮，但是再回水養(yǎng)護(hù)，又能大致恢復(fù)以前的膨脹。由于基體混凝土的強(qiáng)度等級(jí)、使用環(huán)境 與碳化程度各不相同，解體、破碎的工藝及質(zhì)量控制措施的差異，導(dǎo)致再生混凝土強(qiáng)度變化的規(guī)律性較差，不同的研究者所得的結(jié)論也有所不同。 2) 由于