Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-autogenous shrinkage and high-performance recycled concrete
The invention discloses low-autogenous shrinkage and high-performance recycled concrete which can meet pumping requirements. Each cubic meter of the high-performance recycled concrete contains 400-500kg of a cementing material, 950-1150kg of a coarse aggregate (wherein the substitution rate of the recycled coarse aggregate is 70%-100%), 660-715kg of a natural fine aggregate, 160-180kg of water and 7-9kg of an efficient water-reducing agent, and the high-performance recycled concrete is prepared by a process of enveloping stone with cement. The obtained high-performance recycled concrete has the strength grade of C30-C50 and the slump of 180-220mm, and can effectively improve the autogenous shrinkage performance of the recycled concrete, reduce the total autogenous shrinkage rate by above 25% in comparison with ordinary recycled concrete with the same mixture ratio and enable the total autogenous shrinkage rate to be close to ordinary concrete with the same mixture ratio. The high-performance recycled concrete disclosed by the invention has important theoretical value and social significance in promotion of reasonable and extensive application of the recycled concrete, recovery of construction waste resources and the like.
Low-autogenous shrinkage and high-performance recycled concrete
The invention discloses low-autogenous shrinkage and high-performance recycled concrete which can meet pumping requirements. Each cubic meter of the high-performance recycled concrete contains 400-500kg of a cementing material, 950-1150kg of a coarse aggregate (wherein the substitution rate of the recycled coarse aggregate is 70%-100%), 660-715kg of a natural fine aggregate, 160-180kg of water and 7-9kg of an efficient water-reducing agent, and the high-performance recycled concrete is prepared by a process of enveloping stone with cement. The obtained high-performance recycled concrete has the strength grade of C30-C50 and the slump of 180-220mm, and can effectively improve the autogenous shrinkage performance of the recycled concrete, reduce the total autogenous shrinkage rate by above 25% in comparison with ordinary recycled concrete with the same mixture ratio and enable the total autogenous shrinkage rate to be close to ordinary concrete with the same mixture ratio. The high-performance recycled concrete disclosed by the invention has important theoretical value and social significance in promotion of reasonable and extensive application of the recycled concrete, recovery of construction waste resources and the like.
Low-autogenous shrinkage and high-performance recycled concrete
ZHENG JIANLAN (Autor:in) / CHEN XIN (Autor:in) / LUO SURONG (Autor:in) / WANG GUOJIE (Autor:in) / WANG XUEFANG (Autor:in)
20.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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