8—laboratory and field control

... 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 ... proportioning, batching, and control The rate of absorption in lightweight aggregates is a factor that also has a bearing on mixture proportioning, handling, and control of concrete, and depends on the ... replacement of the sand fraction with expanded fine aggregate GUIDE FOR STRUCTURAL LIGHTWEIGHT-AGGREGATE CONCRETE CHAPTER 7—REFERENCES 7.1—Referenced standards and reports The standards and reports...

Ngày tải lên: 24/10/2014, 15:47

... 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...

Ngày tải lên: 24/10/2014, 17:26

... is added to a 35%-sand concrete mix and decreases when added to the 45%-sand concrete mix, using the 40%-sand mix as the control His explanation is, when concrete of low sand content flows, it ... in the field of concrete rheology Since then, numerous researches and modifications to the two-point test were done (Tattersall and Bloomer, 1979; Cabrera and Hopkins, 1984; Wallevik and Gjørv, ... 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...

Ngày tải lên: 16/09/2015, 08:30

... 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)...

Ngày tải lên: 13/10/2015, 15:55

... 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 = ... hardware and appurtenances and their grounding Construction quality control is essential to ensure that the design intent and the durability considerations are properly implemented Such quality -control ... signaling, command and control wiring, or supplemental traction and power devices The specialty transit supplier should provide the engineer with explicit specifications of special equipments and their...

Ngày tải lên: 24/10/2014, 21:58

... construct in the field, and most contractors build floor slabs as single level flat plate Space around the entrance hall and bath room are built with raised floor finishing, and living and bed rooms ... 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...

Ngày tải lên: 27/04/2016, 23:02

... quality control is being exercised during the course of the work 6.2-Quality control Quality control of both materials and workmanship should be exercised in accordance with appropriate ACI and ASTM ... aggregate in a form and later injecting a portland cement-sand grout, usually with admixtures, to fill the voids.” Other terms describing the method, used both in America and internationally, ... the grout Work and materials in this field are described by Tirpak,12 Davis,6 and Narrow.13 See also ACI 304.3R PREPLACED AGGREGATE CONCRETE 304.1R-5 Table - Grading limits coarse and fine aggregates...

Ngày tải lên: 24/10/2014, 17:44

... 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...

Ngày tải lên: 23/10/2013, 22:15

Ngày tải lên: 07/11/2013, 09:15

... 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...

Ngày tải lên: 18/02/2014, 18:20

... 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 ... support loads and maintain them in equilibrium without excessive deformation Large deflections and distortions in structures are controlled by the use of bracing which stiffens the structure and can ... 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...

Ngày tải lên: 14/03/2014, 13:20

... 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...

Ngày tải lên: 17/03/2014, 10:20

... 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...

Ngày tải lên: 23/03/2014, 13:20

Ngày tải lên: 23/03/2014, 20:34

Ngày tải lên: 01/05/2014, 21:25

Ngày tải lên: 12/05/2014, 23:57

Ngày tải lên: 13/05/2014, 03:01

... 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...

Ngày tải lên: 28/05/2014, 20:09