3—proportioning mixing and handling
guide for structural lightweight-aggregate concrete
Ngày tải lên :
24/10/2014, 15:47
... properties Chapter 3—Proportioning, mixing, and handling, p 213R-8 3.1—Scope 3.2—Mixture proportioning criteria 3.3—Materials 3.4—Proportioning and adjusting mixtures 3.5 Mixing and delivery 3.6—Placing ... between 7.5 and 12 lb/ft3 (120 and 192 kg/m3), Vermiculite with a bulk density between 5.5 and 10 lb/ft3 (88 and 160 kg/m3), and group II aggregate that meets the requirements of ASTM C 330 and ASTM ... available to the cement and should not be counted as mixing water Nearly all moisture in the natural sand, on the other hand, may be surface moisture and, therefore, part of the mixing water 2.3.8...
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recent approaches to shear design of structural concrete
Ngày tải lên :
24/10/2014, 17:26
... conducted by Aoyagi and Yamada (1983), Vecchio and Collins (1986), Kollegger and Mehlhorn (1988), Schlaich et al (1987), Kirschner and Collins (1986), Bhide and Collins (1989), Shirai and Noguchi (1989), ... (1987): (a) strut -and- tie model; and (b) tension tie reinforcement Fig 6.11—Strut -and- tie models and truss idealizations for deep beams (Cook and Mitchell 1988) Fig 6.9—Strut -and- tie model idealizations ... both shear and moment are accounted for simultaneously and directly in the design; and 3) the design of Band D-type regions and the transitions between them can be conducted in a unified and consistent...
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Workability and stability of lightweight aggregate concrete from rheology perspective
Ngày tải lên :
16/09/2015, 08:30
... the sand content as the value of plastic viscosity increases when superplasticizer is added to a 35%-sand concrete mix and decreases when added to the 45%-sand concrete mix, using the 40%-sand ... 6.6 – Properties of non-air and air entrained concretes with F6.5 aggregate and slumps greater than 120 mm in Series I and II 145 Table 7.1 – Properties of concrete and Mass Deviation Index ... needed to initiate and maintain flow This depends on the rheological property of the cement paste and the internal friction between the aggregate particles on the one hand, and the external friction...
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Penetrability of lightweight aggregate concrete
Ngày tải lên :
13/10/2015, 15:55
... Complex, Bristol; the South Stand at Rugby Football Union Ground, Twickenham, UK; the grandstand for the exhibition and stampede at Calgary, Canada and the West stand of Newcastle United Football ... Portland cement and Portland blast furnace slag cement The Portland blast furnace slag cement contained about 70% ground granulated slag The aggregates used were river sand, crushed limestone and ... hardened cement confirmed and accumulation of magnesium and sulphates in the concrete (Dement‟ev, 1934 and Ivanov, 1980 )and recently even the formation of films of CaCO3 and Mg(OH)2 (Buenfeld, 1986)...
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analysis and design of reinforced and prestressed-concrete guideway structures
Ngày tải lên :
24/10/2014, 21:58
... live and dead loads, without load factors Standard vehicle-The maximum weight of the vehicle used for design; the standard vehicle weight should allow for the maximum number of seated and standing ... (780 N) each and should comprise those occupying all the seats (the seated ones) and those who are standing in the rest of the space that does not have seats (standees) The number of standees shall ... deflection, cracking and fatigue control under specified loading combinations Type of Steel Prestressing Stage Stress-relieved strand and wire, fpu = 0.85 fP” Low relaxation strand and wire, fpu =...
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Design of modern highrise reinforced concrete structures hiroyuki aoyama
Ngày tải lên :
27/04/2016, 23:02
... organizations and the outline of expected results are mentioned Chapter is entitled "high strength materials", and describes the development of high strength concrete and reinforcement and their ... walls, and so on, subjected to simulated seismic loading, and the evaluation methods of structural performance of New RC members and assemblies Chapter is entitled "finite element analysis", and ... structures, and method of numerical analysis are presented In Chapter 8, outline of a full-scale construction test and the New RC Construction Standard are presented The construction standard is...
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guide for the use of preplaced aggregate concrete for structural and mass concrete applications
Ngày tải lên :
24/10/2014, 17:44
... water-cementitious material ratio to provide a given fluidity, and retards stiffening to provide added handling time in the mixing- pumping cycle and in the penetration of the voids in the coarse aggregate ... 3.1-Aggregate handling Coarse aggregate may be handled and placed by any type of equipment that will not cause the aggregate to degrade or segregate excessively as it is moved and deposited Means ... slightly higher and the drying shrinkage less than half that of conventional concrete.5,6,7 4-Strength The strength of PA concrete depends on the quality, proportioning, and handling of the materials...
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Real-Time Digital Signal Processing - Chapter 5: Design and Implementation of FIR Filters
Ngày tải lên :
23/10/2013, 22:15
... non-causal and hence not physically realizable Instead we must compromise and accept a more gradual cutoff between passband and stopband, as well as specify a transition band between the passband and ... illustrated in Figure 5.1(a) The regions ! !c and ! > !c are referred to as the passband and stopband, respectively The frequency that separates the passband and stopband is called the cut-off frequency ... passband, the magnitude response has a peak deviation dp and in the stopband, it has a maximum deviation ds The frequencies !p and !s are the passband edge (cut-off) frequency and the stopband...
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Tài liệu The Design of Prestressed Concrete Bridges ppt
Ngày tải lên :
18/02/2014, 18:20
... Lutyens, and built posthumously It appears to be a stone and concrete arch with brick spandrels, Figure 1.12 (a) In fact the spandrels conceal a steel portal structure, and the brick and Portland ... best use of standard bar lengths and minimise waste What an engineering designer cannot and retain the integrity of his design is to fly in the face of rationality and economy, and design a heavily ... part on his talent and in part on his training and experience In the UK, prospective engineers concentrate on mathematics and science from the age of 16, and the appreciation and creation of beauty...
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Structural design of steel work
Ngày tải lên :
14/03/2014, 13:20
... that is safe and which conforms to the requirements of the local bye-laws and building regulations Information and methods of design are obtained from Standards and Codes of Practice and these are ... hardness but reduces ductility and toughness Carbon content therefore is restricted to between 0,25% and 0,2% to produce a steel that is weldable and not brittle The niobium and vanadium are introduced ... loads and spans are large and therefore is not often used for domestic architecture Steel structures include low-rise and high-rise buildings, bridges, towers, pylons, floors, oil rigs, etc and...
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Báo cáo Y học: Monitoring the structural consequences of Phe12 fi D-Phe and Leu15 fi Aib substitution in human/rat corticotropin releasing hormone Implications for design of CRH antagonists pdf
Ngày tải lên :
17/03/2014, 10:20
... direction and are relatively close The Oe1 and Oe2 atoms of Glu20 are 3.726 ˚ and 1.983 A, respectively, from the imine He proton and ˚ 3.644 and 5.121 A from the proximal guanidyl Hg11 and Hg12 ... helical and b-sheet conformation [28] and they exhibited a smaller deviation from a-helical rather than b-strand values (see Fig 2C) Tertiary structure An overall evaluation of NOE, 3JHNHa and Ha ... spectra were recorded on Bruker’s 500 and 600-MHz spectrometers in 298K and 310K One- and two-dimensional double-quantum-filtered-COSY [16], TOCSY [17,18] and time-proportional phase incrementation-NOESY...
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Báo cáo khoa học: The structural comparison of the bacterial PepX and human DPP-IV reveals sites for the design of inhibitors of PepX activity pot
Ngày tải lên :
23/03/2014, 13:20
... site (Stb1 and Stb2); those forming the oxyanion hole (Oxa1 and Oxa2); and those responsible for the exopeptidase specificity ˚ (Exo1 and Exo2) For each subsite, residues with main chains and side ... bound to an N-terminus and a C-terminal b-sandwiched domain (respectively in red and blue in Fig 1A) [9], whereas DPP-IV consists of an eight-blade b propeller domain and a C-terminal a ⁄ b hydrolase ... Val470 and Asn471 in PepX that superimpose with residues Val710 and Asn711, respectively, in DPP-IV (Stb1 subsite and the next residue) To a lesser extent this is also the case for Tyr210 in PepX and...
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Principles of structural design
Ngày tải lên :
28/05/2014, 20:09
... study: the textbook and the handbook CRC Press is best known for its handbooks, a tradition dating back to 1913 with publication of the first edition of the Handbook of Chemistry and Physics In recent ... popular 1995 Civil Engineering Handbook, the 1997 Structural Engineering Handbook, the 1999 Bridge Engineering Handbook, and the 2002 Earthquake Engineering Handbook He currently serves as the ... computations, and computer-aided analysis and design of building and bridge structures He has authored and coauthored numerous journal papers, conference proceedings, special publications, and research...
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