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Characteristics of construction waste recycled aggregate

                            Construction waste disposal is in many countries of the world, since the 1990s, in particular, is one of the strategic objectives of the developed countries, environmental protection and sustainable development. It is understood that the concrete and brick masonry construction waste debris, after a series of procesкупить wanlida malata smb-a1011sing, can produce recycled aggregate.Recently, the well-known domestic crusher enterprises Hin Sai Engineering Technology Co., Ltd., Shanghai received many telephone customers, have doubt using standard construction waste recycled aggregate. For this reason, many experts in the industry said: brick masonry construction waste, recycled aggregate concrete blocks, compared to the natural rock aggregates with high porosity, water absorption, and low strength, will lead to existing concrete with natural aggregate concrete characteristics.Compressive strengthIts aggregate recycled concrete and natural aggregate concrete, so they are not the same intensity with age growth. Related test; 28 d compressive strength compared with natural aggregate concrete, recycled aggregate concrete of the same water-cement ratio of about 15% lower, but its deviation from slowly shrinking with the growth of the age. Recycled concrete using recycled aggregate, it is renewable strength of concrete and the use of waste concrete strength has close ties. Recycled aggregate strength under the conditions of the same water-cement ratio, the higher the recycled concrete strength higher.Tensile strengthRecycled concrete tensile strength and compressive strength, with the growtдробильная установка «barmac»h of the age and growth. The difference between the tensile strength of recycled concrete with natural aggregate concrete tensile strength increases with the age of the growth to 28 d age after basically unchanged. But if recycled concrete mixed with fine silica fume and superplasticizer can significantly improve the tensile strength and the most obvious, especially after 28 d age.SlumpSubstituted proportion of recycled concrete slump and recycled aggregate, recycled aggregate is larger than the water absorption of the natural aggregate, voids, high surface roughness, with the amount of pulp, so the conditions in the same water-cement ratio The higher the proportion of its slump under renewable recycled aggregate concrete replaced the smaller. Aggregate surface roughness increases the friction of the mixes in the mixing and pouring. Reproducing the slump of concrete with cement ratio increases, and ordinary concrete is consistent. And we can add the right amount of fly ash in the recycled concrete superplasticizer improve slumописание мельницы для тонкого и свp, can ensure better water retention and cohesiveness.Shrinkage ofThe shrinkage of one of the important indicators of the concrete. The related tests show that the shrinkage of recycled concrete aggregate. Water absorption, high void ratio of recycled aggregate recycled concrete used. So it's the shrinkage of natural aggregate concrete and the shrinkage of the extent and shrinkage continued with its time recycled aggregate proportion increases and lengthened. Recycled aggregate proportion of the more than 50%, the drying shrinkage duration is long, but very slow drying shrinkage rate after 50 d age, should be small incremental drying shrinkage.Water consumptionRecycled aggregate and natural aggregate, so the amount of water recycled concrete with natural aggregate concrete. Recycled aggregate internal defects, water absorption. Furthermore, the surface roughness of the recycled aggregate is higher than the natural aggregate, so with the ratio of fine aggregate (sand ratio) higher, and replaced by a higher proportion of recycled aggregate growth. Than natural aggregate concrete with water to achieve the same slump due to the high percentage of sand, and more and slump performance is difficult to achieve.Apparent densityRecycled aggregate surface roughness and frictional resistance, vibration compacting concrete difficult. Furthermore recycled aggregate internal defects and porosity. With increasing the substitution ratio of the recycled aggregate concrete, the concrete containing the gas increases, the apparent density becomes small. In addition, recycled aggregate and river sand, gravel and other natural aggregate compared to the proportion of small, use of recycled aggregate the higher the percentage, the smaller the apparent density of the concrete.