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The Compression-deformation Behaviour of Concrete with Various Modified recycled aggregates

Journal of Wuhan University of Technology(Materials Science) 2005年第2期20卷 127-129页

作者：杜婷 School of Civil Engineering and Mechanics Huazhong University of Science and TechnologyWuhan 430074 China Department of Civil Engineering Hunan City CollegeYiyang 413000China Assoc.Prof

Modified recycled aggregates were prepared with three different cement-admixture grouts. The physical properties, such as water absorption, apparent density, crushing index, slump and compressive strength of the recycled aggregate and the recycled concretes were tested, and the tests for the compression-deformation behavior of the concretes were also performed. The experimental results show that the cement-Kim powder grout is satisfied for enhancing the recycled concrete, and the modification of the recycled aggregate with the grouts can improve the toughness and the deformation ability of the concretes.

关键词： recycled aggregates concrete recycled aggregates ultrafine mineral powder

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Performance studies on recycled aggregate concrete with treated recycled aggregates

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Waste Disposal and Sustainable Energy 2023年第4期5卷 451-459页

作者： Malathy Ramalingam Jagan Sivamani Karuppasamy Narayanan Faculty Department of Civil EngineeringSona College of TechnologySalemTamil NaduIndia

Excessive construction activities generate huge quantities of waste that are disposed of in nearby sites,leading to environmental *** the concrete fractions of construction wastes for their utilization as aggregates has been predominant among industrialists and researchers in recent ***,the smearance of cement mortar on the recycled aggregates affects the concrete *** treatments were developed to remove the weak cement mortar or seal the micro-pores on the adhered cement mortar of recycled *** paper investigates the comparative efficiency of acid and carbonation treatment on recycled coarse aggregate(RCA)properties and its behaviour on recycled aggregate concrete(RAC).The RCA was treated with HCl acid at 0.1 mol/L,0.5 mol/L,and 0.8 mol/L and CO_(2) at 0.1 bar,0.2 bar,and 0.4 bar and tested for their physical properties,and the concrete mixtures with treated recycled aggregates were tested for fresh and hardened *** could be observed that the properties of RAC were affected owing to the smearance of weak mortar,whereas for the concrete with carbonated(RACc)and chemically treated aggregates(RACa),the concrete properties tended to *** strength of RAC was 28.59%less than that of normal aggregate concrete(NAC),whereas the strength of RACc and RACa was enhanced by 16.44%and 9.7%compared to that of RAC at 28 *** water absorption of RAC was 47.51%more than that of NAC,whereas the water absorption of RACa and RACc was 28.67%and 33.75%lesser than ***-soaking the RCA with acids removes the adhered mortar due to its acidic *** contrast,in carbonation,the CO_(2) reacts with the Ca(OH)_(2) on the cement mortar to form CaCO_(3),filling the micro-cracks in the cement mortar on the RCA.

关键词： recycled aggregates Chemical Carbonation Adhered mortar recycled aggregate concrete Strength Water absorption

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A STUDY ON THE MIX DESIGN AND FUNDAMENTAL PROPERTIES OF CONCRETE PERFORATED BRICKS MADE OF recycled aggregates

A STUDY ON THE MIX DESIGN AND FUNDAMENTAL PROPERTIES OF CONC...

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The International Symposium on Innovation & Sustainability of Structures in Civil Engineering

作者： Tong Hao Lixin Liu and Lili Xie School of Civil Engineering Zhengzhou University Zhengzhou 450002 China

＜正＞In China, a huge quantity of construction and demolition （C＆D） wastes are produced every year, the wastes are mainly composed of concrete rubbles or bricks. The disposal of the wastes has become a severe social and environmental trouble in the territory. The possibility of reuse these wastes in construction industry is thus of increasing importance. In this paper, the test results of mixture ratio of the concrete made of recycled aggregates （crushed concrete rubbles or crushed bricks） are givea The fundamental properties such as the compressive strength, the shrinkage ratio and the freezing-thawing characteristics of concrete perforated brick made of the recycled aggregates are tested and discussed in detail. The technological requirements to produce the concrete perforated bricks made of recycled aggregates molded with extrusion method are also discussed. It is indicated that the grade of concrete perforated bricks made of waste crushed concrete aggregates can reach MU15 or MU20, the grade concrete perforated bricks made of waste crushed brick aggregates can reach MU10 or MU15 according to the specifications of Chinese Code-"Code for design of masonry structure GB50003 - 2001". These concrete perforated bricks made of recycled aggregates may be used in the building of masonry structure.

关键词： Concrete perforated brick recycled aggregates mixture ratio shrinkage ratio masonry structure.

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EFFECTS OF FLY ASH ON MECHANICAL PROPERTIES OF 10-YEAR-OLD CONCRETE PREPARED WITH recycled CONCRETE aggregates

EFFECTS OF FLY ASH ON MECHANICAL PROPERTIES OF 10-YEAR-OLD C...

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2nd International Conference on Waste Engineering and Management

作者： Chisun POON Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong KongChina

＜正＞This paper presents the findings of a long-term study on the mechanical properties of recycled aggregate concrete（RAC） containing 25%,35%and 55%Class-F fly ash,as cement replacement,after curing in water and an outdoor exposure condition for 10 *** in compressive strength,splitting tensile strength,modulus of elasticity with time are determined and *** was found that after 10 years,the compressive strength and modulus of elasticity of the concrete mixture with 100%recycled aggregate was still lower than that of the control *** this period,the highest gain of compressive strength and modulus of elasticity was recorded for the concrete mixture prepared with 55%fly ash RAC followed by 35%fly ash RAC and 25%fly ash *** though the 55%fly ash RAC at the age of 28 days had lower compressive strength than other concretes,it attained the highest strength gain of more than 105%between 28 days and 10 *** general,the compressive and splitting tensile strengths of the water cured concrete were higher than that of outdoor cured *** the modulus of elasticity of the water cured and outdoor exposure concrete were *** study results show the optimal mix proportions for preparing RAC mixtures is by using 50%RA as a replacement of natural aggregates and using 25%FA as a replacement of OPC.

关键词： Concrete Fly ash Long-term properties recycled aggregates

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Experimental Study of Waste Tire Rubber,Wood-Plastic Particles and Shale Ceramsite on the Performance of Self-Compacting Concrete

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Journal of Renewable Materials 2020年第2期8卷 153-170页

作者： Lei Tian Liuchao Qiu Jingjun Li Yongsen Yang College of Water Resources&Civil Engineering China Agricultural UniversityBeijing100083China

In recent decades,the utilization of waste tires,plastic and artificial shale ceramsite as alternative fine aggregate to make self-compacting concrete(SCC)has been recognized as an eco-friendly and sustainable method to manufacture renewable construction *** this study,three kinds of recycled aggregates:recycled tire rubber particles,wood-plastic particles,artificial shale ceramsite were used to replace the sand by different volume(5%,10%,20%and 30%),and their effects on the fresh and hardened properties of SCC were *** slump flow and V-funnel tests were conducted to evaluate the fresh properties of modified-SCC *** hardened properties include 3,7 and 28-day compressive strengths,axial compressive strength,static elastic modulus,and compressive stress-strain behavior at 28 *** test results showed that the incorporation of these three kinds of alternative aggregates had a negative impact on the fresh properties of ***,the 28-day compressive strength and axial compressive strength decreased with the increase of rubber and wood-plastic particles *** this experiment,all the three kinds of recycled aggregates can improve the ductility and deformability of SCC,and the most excellent performance comes from SCC with recycled rubber particles.

关键词： Self-compacting concrete recycled aggregates lightweight aggregates waste management

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