外文翻译--再生改性混凝土的性能(编辑修改稿)

外文翻译--再生改性混凝土的性能(编辑修改稿)内容摘要：

ting time, expansion admixture amount bigger, the setting time is fast, doping agent will have the same results with and without the addition. Curing conditions Compared with ordinary concrete, shrinkage pensating concrete need more water conservation fully, because the water is the essential factors of expansion, long in the water curing of concrete can obtain the biggest expansion. Expansive concrete to dry air (RH = 60 177。 5%) curing shrinkage, too, but then return maintenance, and can restore the previous expansion. Drying shrinkage As with ordinary concrete, shrinkage pensating concrete will also occur in air drying shrinkage, factors affecting the drying shrinkage of concrete with ordinary roughly the same, but the relative humidity of the external factors, internal factors of water binder ratio is more important. Under the same conditions, drying shrinkage fall of shrinkage pensating concrete and mon concrete in roughly the same. Recycled concrete Strength with the matrix concrete of recycled concrete strength, regeneration substitution rate and recycled concrete mixture ratio is closely related to aggregate crushing technology, recycled aggregate. Due to the strength of concrete, the matrix using environment and carbonization degree each are not identical, differences of disintegration, crushing process and quality control measures, resulting in regular changes of concrete strength regeneration is poor, different researchers have different conclusions. Test results show that: 1) the pressive strength of recycled concrete is lower than the pressive strength of natural aggregate concrete ratio, reduce the range of 0%~30%. Improve and strength of recycled aggregate concrete with strength of recycled aggregate concrete matrix increased。 and with the increase of recycled aggregate replacement rate decreased, when the recycled aggregate replacement rate is less than 30%, the recycled concrete strength decreases little。 recycled concrete replaced natural coarse aggregate with recycled coarse aggregate strength decreased less, and regeneration concrete recycled fine aggregate instead of natural fine aggregate strength decreased obviously, the age showed the same trend。 the water cement ratio of recycled concrete strength with great effect, reducing the water cement ratio, with the natural aggregate concrete strength contrast, more and more small to reduce the strength of recycled concrete. For the recycled concrete with different strength grade, the origin and nature of the influence of recycled aggregate on the strength degree is different: preparation of high strength recycled aggregate concrete, influence on strength of recycled aggregate concrete sources and properties of recycled aggregate。 recycled aggregate medium strength concrete, the strength of recycled aggregate concrete and influence。 preparation of recycled aggregate concrete with low intensity, the regeneration effect of mixed coagulation on the strength is very small. 2) because of recycled aggregate adsorption with lots of old mortar, resulting in elastic modulus of recycled aggregate concrete is usu。