华南理工大学学报(自然科学版)
華南理工大學學報(自然科學版)
화남리공대학학보(자연과학판)
JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE EDITION)
2014年
2期
50-56
,共7页
废弃混凝土%废弃混凝土掺合型再生混凝土%抗压强度%抗拉强度%弹性模量%冲切承载力
廢棄混凝土%廢棄混凝土摻閤型再生混凝土%抗壓彊度%抗拉彊度%彈性模量%遲切承載力
폐기혼응토%폐기혼응토참합형재생혼응토%항압강도%항랍강도%탄성모량%충절승재력
waste concrete%waste concrete-participated recycled concrete%compressive strength%tensile strength%elastic modulus%punching bearing capacity
针对当前再生混凝土工程应用所面临的再生骨料生产成本高昂和废弃混凝土利用率偏低的问题,提出将废弃混凝土经适当破碎和湿水后直接与新拌混凝土混合拌制工程用混凝土,制得一种新型的再生混凝土材料---废弃混凝土掺合型再生混凝土。拌制该再生混凝土所用废弃混凝土块的最大粒径可达50~80 mm,扩大了废弃混凝土在降低生产成本方面的优势,同时提高了废弃混凝土的利用率。对150、300 mm模数废弃混凝土掺合型再生混凝土试件以及废弃混凝土掺合型再生混凝土板的力学性能进行了研究。结果表明:废弃混凝土掺合型再生混凝土具有良好的力学性能,即使在废料掺量达到30%~40%时,其抗压强度、抗拉强度和弹性模量仍很接近相应强度等级的普通混凝土;废弃混凝土掺合型再生混凝土板的冲切承载力及破坏特征与普通混凝土板相近。
針對噹前再生混凝土工程應用所麵臨的再生骨料生產成本高昂和廢棄混凝土利用率偏低的問題,提齣將廢棄混凝土經適噹破碎和濕水後直接與新拌混凝土混閤拌製工程用混凝土,製得一種新型的再生混凝土材料---廢棄混凝土摻閤型再生混凝土。拌製該再生混凝土所用廢棄混凝土塊的最大粒徑可達50~80 mm,擴大瞭廢棄混凝土在降低生產成本方麵的優勢,同時提高瞭廢棄混凝土的利用率。對150、300 mm模數廢棄混凝土摻閤型再生混凝土試件以及廢棄混凝土摻閤型再生混凝土闆的力學性能進行瞭研究。結果錶明:廢棄混凝土摻閤型再生混凝土具有良好的力學性能,即使在廢料摻量達到30%~40%時,其抗壓彊度、抗拉彊度和彈性模量仍很接近相應彊度等級的普通混凝土;廢棄混凝土摻閤型再生混凝土闆的遲切承載力及破壞特徵與普通混凝土闆相近。
침대당전재생혼응토공정응용소면림적재생골료생산성본고앙화폐기혼응토이용솔편저적문제,제출장폐기혼응토경괄당파쇄화습수후직접여신반혼응토혼합반제공정용혼응토,제득일충신형적재생혼응토재료---폐기혼응토참합형재생혼응토。반제해재생혼응토소용폐기혼응토괴적최대립경가체50~80 mm,확대료폐기혼응토재강저생산성본방면적우세,동시제고료폐기혼응토적이용솔。대150、300 mm모수폐기혼응토참합형재생혼응토시건이급폐기혼응토참합형재생혼응토판적역학성능진행료연구。결과표명:폐기혼응토참합형재생혼응토구유량호적역학성능,즉사재폐료참량체도30%~40%시,기항압강도、항랍강도화탄성모량잉흔접근상응강도등급적보통혼응토;폐기혼응토참합형재생혼응토판적충절승재력급파배특정여보통혼응토판상근。
In order to reduce the production cost of recycled aggregate and improve the utilization rate of waste con-crete in common engineering application of recycled concrete,a new type of recycled concrete material named waste concrete-participated recycled concrete was prepared by straightly blending wet and broken waste concrete block with fresh concrete.The maximum size of waste concrete block for blending is up to 50~80 mm,which may expand the superiority of waste concrete in reducing the production cost and improving its utilization rate.Then,mechani-cal behavior studies were conducted for the 150 or 300 mm module specimens and the slabs of waste concrete-partici-pated recycled concrete.The results show that,even when the participation rate of waste concrete reaches 30%~40%,the compressive strength,tensile strength and elastic modulus of the prepared recycled concrete are very close to those of common concrete in the same strength grade,which means that the recycled concrete possesses ideal mechanical properties.Moreover,it is also found that both the punching bearing capacity and the failure cha-racteristics of the recycled concrete slabs are very close to those of common concrete slabs.