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Through parameter analysis, spectrum analysis, and pattern recognition techniques, the influence of the concrete aggregate particle size on AE wave propagation and attenuation was revealed. The
The results show a wide variation in concrete performance amongst the different aggregates, with the range/average value for 28d compressive strength being
Coarse recycled concrete aggregates, obtained by crushing waste concrete debris collected from different construction and demolition waste sources, were
5.4.. Experiment designFour different kinds of coarse aggregate were used in the new concrete. These kinds included: (a) aggregates from natural origin, (b)
The first concrete mixture was based on a 100 % ordinary Type I/II portland cement (OPC), while the second consisted of a ternary 60:30:10 volumetric
This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce highworkability concrete substituting 0100%
15.3.4.1 Design of Processing Plants. The objective of any concrete aggregate processing operation should be the production of goodquality, ‘clean’ coarse
The mean value of cement pastefine aggregate interfacial transition zones (ITZs) is 30 μm [[49], [50], [51]]. As shown in Fig. 12, the microscopic examination of
The compressive strength of the concrete made with the granulated aggregate reached 16.0 MPa after 28 d, whereas that of the concrete made with crushed
The first concrete mixture was based on a 100 % ASTM Type I/II ordinary portland cement, while the second consisted of a volumetric blend of 60 % of this cement, 30 % of a Class C fly ash and
Through parameter analysis, spectrum analysis, and pattern recognition techniques, the influence of the concrete aggregate particle size on AE wave propagation and attenuation was revealed. The
Abstract and Figures. Aggregates form 60% to 75% of concrete volume and thus influence its mechanical properties. The strength of (normal or highstrength) concrete is affected by the maximum size
Thus, in the study [7], the effect on durability of lightweight concrete aggregate such as expanded clay with different grades 25, 15, 5 mm at different water to cement ratios has been studied. Along with the water to cement ratio, properties of aggregates and binder, the porosity influences the strength of concrete. K. S. Pann and others
Yu et al. [92] analyzed the influences of concrete strength and concrete cover thickness on the service life of CAC under different island reef environments, Compared with normal aggregate concrete (NAC), CAC has a faster strength growth and a higher splitting tensile strength originating from the existence of high salt content in seawater
The influences of different continuous gradation RCA on the workability of the fresh concrete are very remarkable with the increase of the mass proportion of the 5.020.0 mm single grain class
Surface texture of aggregate influences the bond between the aggregate and cement. Smooth surface such as that found on gravels will have a poor bond. Crushed aggregates have a rough texture and
郭帅成，博士，副教授，硕士生导师。主要从事混凝土材料与结构构件耐久性，新材料在结构和岩土工程中应用，无损检测和混凝土断裂力学研究。目前已在Cement and Concrete Research等水泥基材料权威期刊，Composites Part BEngineering等
VARIATIONS IN MIXING WATER REQUIREMENT AND STRENGTH WERE MEASURED IN 51/2SACK, 3 TO 4IN. SLUMP CONCRETE CONTAINING AGGREGATES FROM NINE SOURCES, ALL OF WHICH WERE GRADED TO A 1IN. MAXIMUM SIZE. TESTS FOR THE VOID CONTENT OF BULK AGGREGATE AND THE RATE OF FLOW
Creep of Concrete 1Gambali.Ajay Kumar, 2Shanagam.Naveen the aggregate influences the creep of concrete through a restraining effect on the magnitude of creep. The paste which is creeping under load is restrained by aggregate which do not creep. The stronger the aggregate the more is the restraining effect and hence the less is
Surface texture of aggregate influences the bond between the aggregate and cement. Smooth surface such as that found on gravels will have a poor bond. Crushed aggregates have a rough texture and give a good mechanical bond with cement. Hence, for a given aggregatecement ratio in a concrete mix, workability will be higher, if rounded
Thus, in the study [7], the effect on durability of lightweight concrete aggregate such as expanded clay with different grades 25, 15, 5 mm at different water to cement ratios has been studied. Along with the water to cement ratio, properties of aggregates and binder, the porosity influences the strength of concrete. K. S. Pann and others
Abstract and Figures. Aggregates form 60% to 75% of concrete volume and thus influence its mechanical properties. The strength of (normal or highstrength) concrete is affected by the maximum size
Yu et al. [92] analyzed the influences of concrete strength and concrete cover thickness on the service life of CAC under different island reef environments, Compared with normal aggregate concrete (NAC), CAC has a faster strength growth and a higher splitting tensile strength originating from the existence of high salt content in seawater
High carbon emissions, shortages of natural aggregates and environmental pollution of waste concrete powder (WCP) have become open issues for the traditional concrete industry. Aggregates prepared by crushing and screening waste concrete usually possess poor mechanical properties. Meanwhile, the WCP cannot be
Concrete can be recycled after certain processing technologies for use in pavement engineering but the flexural strength (FS) is difficult to predict accurately in the design process. This study proposes a novel systematic and evolved approach to estimate the FS of recycled concrete. The proposed methods are conducted based on the random
Surface texture of aggregate influences the bond between the aggregate and cement. Smooth surface such as that found on gravels will have a poor bond. Crushed aggregates have a rough texture and
🕑 Reading time: 1 minuteContents:Factors Affecting Strength of ConcreteQuality of Raw MaterialsWater / Cement RatioCoarse / fine aggregate ratioAggregate / Cement RatioAge of concreteCompaction of
Creep of Concrete 1Gambali.Ajay Kumar, 2Shanagam.Naveen the aggregate influences the creep of concrete through a restraining effect on the magnitude of creep. The paste which is creeping under load is restrained by aggregate which do not creep. The stronger the aggregate the more is the restraining effect and hence the less is
摘要： This article system research concrete mechanics performance in same watercement ratio situation and different recycled coarse aggregate replacement percentage.The test result indicated that along with mixes increasing again in the recycled aggregate
Pores with less than 4 µm size affects the aggregate durability as it is subjected to thawing and freezing (Neville, 1995). The volume of concrete is represented by threequarters of aggregate hence, the porosity of concrete is largely represented by porosity of aggregate. The surface pores affects bonding between aggregate and cement paste.
