Wang and Davies [11] investigated the effects of a rotational restraint on the response of CFST columns with connected beams exposed to fire and they showed that the local buckling of the steel tube influenced the effective length of a restrained concrete filled tests conducted by Pires et al [12] showed that axial restraint on CFST columns
Abstract Read online To improve the wear resistance and mineral crushing performance of grinding rollers in cement mining and other engineering fields a striped groove morphology was designed on the normal grinding roller surface in this study
The influence of coarse aggregate crushing on concrete deformation and failure characteristics is explored at the mesoscopic level Effects of maximum particle size of coarse aggregates and steel fiber contents on the mechanical properties and impact resistance of recycled aggregate concrete Advanced in Structure Engineering 24 13 2021
Seven electric resistance wire strain gages were placed on each of the concrete rings tested at points where cracks appeared according to the layout of bending moments section of the test objects In each case the concrete was subject only to cracking in tension areas Fig 9 ; no concrete crushing was observed in any compression area
There is an increasing concern on the vulnerability of concrete gravity dams under blast loads To a better evaluation of the blast resistance the effect of the initial stress field is taken into consideration herein Firstly a fluid solid coupling numerical model is established to investigate the blast resistance of concrete gravity dams
The features of concrete cracking crushing steel plate shear yielding and local buckling and the failure model of C PSW/CE were experimentally investigated The extended finite element method XFEM was employed in the finite element model FEM to simulate the concrete cracking in shear Introducing the shear resistance of concrete panel
Design values of concrete material properties according to EN1992 1 1 Unit weight γ The unit weight of concrete γ is specified in EN1991 1 1 Annex plain unreinforced concrete γ = 24 kN/m concrete with normal percentage of reinforcement or prestressing steel γ = 25 kN/m Characteristic compressive strength f ck The characteristic compressive
Besides concrete crack resistance frost resistance and fatigue resistance were tested to ensure the road performance of sandstone using the stabilized gravel stratum and then local raw material utilization was enlarged and project costs were reduced 2 Materials and Methods Consistent with the smaller crushing value of aggregates
Mixture Compositions Nine different concrete mixtures with varying water/cement ratios cement contents cement types and aggregates were tested The tested mixtures are given in Table 4 shows the grading curves of the used aggregates and the different combined aggregate mixtures The standard aggregate mixture of river sand and
Therefore DEM is suitable for investigating the influence of coarse aggregate crushing on concrete mechanical properties The fragment replacement method FRM [38] [39] and bonded particle model BPM [40] [41] [42] are two strategies used in DEM to simulate particle breakage Breakable particles are replaced by a succession of sub
The compressive strength of a hollow concrete block is mainly determined by its composition especially the binder content in the mixture compaction level aggregates used and the curing method Dawood et al 2010 Ganeshan & Ramamurthy 1992 recommended a rational method to test the system under compressive loads while the shear strength was
Web crushing strength of I shaped concrete beams with FRP shear reinforcement Sergey Usanov; Sergey Usanov a 1 Kuban State Technological University 350072 Russian Federation This paper presents the results of research on specific kind of shear resistance of basalt fiber reinforced polymer BFRP reinforced concrete beams associated
The fine aggregate used was artificial sand resulting from the crushing of gneiss stone The maximum aggregate size of the fine aggregate was mm and it had a According to Shah and Bishnoi [63] the carbonation resistance for cement containing mineral additions is lower when compared to OPC due to the lower amount of calcium
where H m and H c a are the measured hardness values of mortar and coarse aggregate respectively; l m and l c a are the equivalent lengths of mortar and aggregate respectively; V m and V c a are the volume fractions of mortar and coarse aggregate respectively More details regarding the effective hardness can be found in Wang et al
The frictional properties of the coarse aggregate used in asphalt concrete are a major contributor to the friction of the surface mixes Selecting an aggregate that is not only polish and crush resistant to withstand the mechanical degradation and grinding under traffic loading but also has a low friction loss rate and reasonable friction life is vital A laboratory aggregate test
Web crushing failure is an undesirable beam failure as it typically occurs suddenly without warning This paper aims to investigate the reliability and safety performance of prestressed concrete
concrete Part 4 Mechanical properties [CED 2 Cement and Concrete] Gr 7 IS 2366 Part IV 1963 Reaffirmed 1990 Indian Standard NOTE 1 The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load With aggre gate of aggregate crushing
This indicates that such crushing method might be suitable for composites that demand high workability and has a resistance characteristic not strongly dependent on the interlocking between particles such as Portland cement concrete
Abrasion resistance is one of the most important durability properties of concrete Especially highway airport and industrial floor pavements should be resistant to abrasion The investigation is directed to define the suitable aggregate of mortar to be used in
The impact resistance of cement composites 300 × 170 × 150 mm 3 with a thickness of 150 mm is investigated using a 60° conical nosed projectile with a diameter of mm and a mass of g which is fabricated from ASSAB XW 42 steel and hardened to 60 62 HRC at velocities of approximately 400 m/s The extent of localized damage in
The progressive collapse resistance of reinforced concrete RC and precast concrete PC buildings has become a rising concern in recent years Extensive research has been conducted to investigate the structural response of framed concrete structures after the local damage of single or multiple structural components
When crushing index changes from 9% to 37% 28d strength 7d strength and 3d strength decreased respectively from MPa MPa and MPa to MPa MPa and MPa and decrease amplitudes are 28% 26% and 35% respectively Meanwhile when crushing index is greater than 24% downward trend of strength is more obvious
However the carbonation resistance of concrete was not improved to the level of natural aggregates due to the remaining tiny cement paste and mortar on the surface of the new recycled aggregate Therefore it is deemed necessary to further research and experiment such as device improvement or binder development to reduce durability degradation
