4—physical and mechanical properties of structural lightweightaggregate concrete
guide for structural lightweight-aggregate concrete
Ngày tải lên :
24/10/2014, 15:47
... durability CHAPTER 4—PHYSICAL AND MECHANICAL PROPERTIES OF STRUCTURAL LIGHTWEIGHTAGGREGATE CONCRETE 4.1—Scope This chapter presents a summary of the properties of lightweight concrete The information ... laboratories of the National Bureau of Standards (Kluge, Sparks, and Tuma 1949) and the U.S Bureau of Reclamation (Price and Cordon 1949) to determine properties of concrete made with a broad range of ... M.; and Hoff, G C., 1995, Mechanical Properties, Durability and Fire Resistance of High-Strength Lightweight Concrete, ” International Symposium on Structural Lightweight-Aggregate Concrete, Sandefjord,...
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recent approaches to shear design of structural concrete
Ngày tải lên :
24/10/2014, 17:26
... struts and the strain softening of diagonally cracked concrete The compressive strength f2max of the diagonally cracked concrete is given as 445R-42 MANUAL OF CONCRETE PRACTICE Fig 6.7—Strut -and- tie ... the flow of internal forces in structural- concrete members and provide structural systems made out of concrete and reinforcement that ensure equilibrium The original 45 degree truss model of Ritter ... American Concrete Institute 318M Building Code Requirements for Structural Concrete and Commentary 446 Fracture Mechanics of Concrete: Concepts, Models, and Determination of Material Properties...
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Workability and stability of lightweight aggregate concrete from rheology perspective
Ngày tải lên :
16/09/2015, 08:30
... resistance of the concrete and is a measure of the force necessary to start the movement of the concrete The h-value is the relative viscosity and is a measure of the resistance of the concrete ... of gravitational acceleration (g) .68 Table 4.1 – Properties of non-air entrained concrete with a w/c of 0.35 (Series I) .80 Table 4.2 – Properties of non-air entrained concrete with a w/c of ... II) 81 Table 4.3 – Properties of non-air entrained concrete with a w/c of 0.45 (Series I) .85 Table 4.4 – Properties of air entrained concrete with F6.5 aggregate and a w/c of 0.35 in Series I...
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Penetrability of lightweight aggregate concrete
Ngày tải lên :
13/10/2015, 15:55
... Physical properties of Leca aggregate 51 Table 3.4: Summary of comparison of physical properties of RCA and NA 53 Table 3.5: Mix Proportions of concrete samples 54 Table 4.1: Summary of penetrability ... penetrability of LWAC to water and chloride in relation to physical and geometrical properties of lightweight aggregate and different types of concrete c) To investigate the effect of chloride ingress and ... analyses of 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...
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analysis and design of reinforced and prestressed-concrete guideway structures
Ngày tải lên :
24/10/2014, 21:58
... shortening of concrete d creep of concrete e shrinkage of concrete f relaxation of steel The amount of prestress loss due to these causes depends on a number of factors that include, properties of the ... the benefits of standardizing the structural elements, in terms of ease and time of construction and maintenance, should be examined and the effective options implemented 2.8.2 -Standardization ... derailment, kip (kN) Base of Napierian logarithms Modulus of elasticity of concrete, psi (Pa) 358.1R-3 Section 5.6.3 Eci = Modulus of elasticity of concrete at Es = Modulus of elasticity of reinforcement,...
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Design of modern highrise reinforced concrete structures hiroyuki aoyama
Ngày tải lên :
27/04/2016, 23:02
... reports of laboratory structural tests of RC members, laboratory and field tests of high strength concrete, and operation tests of various stages of construction The structural design and construction ... definition of high durability concrete A concrete bucket is commonly used for the placement of column concrete, and placement of concrete not more than about 50 cm deep and compaction by means of an ... responsibility of contractor in the quality control of concrete and form works, separate concreting for columns and floor framing, proper use of concrete buckets, concrete pumps, vibrators, and so on...
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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
... conventional concrete showed a modulus of rupture of over 80 percent of that of a monolithic beam of the older concrete, and numerous cores taken from one concrete bonded to another and tested ... 13 -Concrete of an arch rib ready for erection of forms and placement of coarse aggregate, McArthur Bridge, Detroit, Michigan 4.2-Preparation of concrete surfaces Fig 12 -Concrete preparation of ... Aggregate Concrete, ” Department of the Army Corps of Engineers, Office of the Chief of Engineers 12 Tirpak, Edward G., “ORNL-1739, Report on Design and Placement Techniques of Barite Concrete...
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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
... 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 stopband The design is based on magnitude ... Magnitude response of bandpass filter with narrow bandwidth 188 DESIGN AND IMPLEMENTATION OF FIR FILTERS where !a and !b are the lower and upper cut-off frequencies, respectively The bandwidth is the ... the center frequency and the bandwidth of the passband A narrow bandpass filter may be called a resonator (or peaking) filter The magnitude response of an ideal bandstop (or band-reject) filter...
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Tài liệu The Design of Prestressed Concrete Bridges ppt
Ngày tải lên :
18/02/2014, 18:20
... ductility of reinforced concrete Imposed loads and imposed deflections Creep and relaxation of concrete Truss analogy Strut -and- tie analogy Continuity between the concepts of bending and arching ... an intuitive understanding of the behaviour of structures, a thorough understanding of the nature of the various building materials, and an appreciation of the appearance of their structures ... rest with the combined response of public and profession The choice of a solution that is expressive of the flow of forces applies to the design of members and details of a bridge as well as to the...
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Structural design of steel work
Ngày tải lên :
14/03/2014, 13:20
... manufacture and types of steel Structural design Fabrication of steelwork 1 12 CHAPTER Mechanical Properties of Structural Steel 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 Variation of material properties ... forces The structural behaviour of a steel element depends on the nature of the forces, the length and shape of the cross section of the member, the elastic properties and the magnitude of the yield ... 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...
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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
... extended side chains of Arg16 and Glu20, as well as those of His13 and Glu17, are oriented towards the same direction and are relatively close The Oe1 and Oe2 atoms of Glu20 are 3.726 ˚ and 1.983 A, ... proton and ˚ 3.644 and 5.121 A from the proximal guanidyl Hg11 and Hg12 protons of Arg16 (Fig 3B) On the other hand, the ˚ Oe2 atom of Glu17 is found at 5.485 A, far from the Hd2 proton of the ... in disallowed regions of Ramachandran plot (Table and Fig S2) According to the PROCHECK-NMR [37] program, the average of the 40 models and the mean minimized structure of the synthetic analogue...
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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
... comparison of the active and specificity sites of the two X-PDAP enzymes, the bacterial PepX (green) and the human DPP-IV (orange) (B) Superposition of the active and specificity sites of the S9 ... in Table and Fig 4A For the cluster of lowest energy, both the position and the conformation of the ligand are close to those observed in the 3D structure of the complex between DPP-IV and valine-pyrrolidide ... site of the crystalline structure of PepX from L lactis; and 4, docked into the active site of the modeled structure of PepX from S gordonii c B C D 2055 Sites for the design of inhibitors of PepX...
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Principles of structural design
Ngày tải lên :
28/05/2014, 20:09
... first edition of the Handbook of Chemistry and Physics In recent years, we have had an increasing number of requests for reprintings of portions of our handbooks to fit a narrower scope of interest ... in the areas of structural stability, structural dynamics, structural materials, numerical modeling, engineering computations, and computer-aided analysis and design of building and bridge structures ... engineering monographs and handbooks, and is the coauthor of two books on the subject of structural stability In addition to conducting research, Dr Lui teaches a variety of undergraduate and graduate...
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Báo cáo hóa học: " Research Article Design and Implementation of a Lightweight Security Model to Prevent IEEE 802.11 Wireless DoS Attacks" pdf
Ngày tải lên :
21/06/2014, 05:20
... to the attacks and also to obtain the average of round trip response time The properties of the ICMP packets are set as the default in real world with 56 bytes length and interval of every second ... Comparison The impact of the ACFNC model on delay of the TCP and UDP packets are presented in Figures 9(a) and 9(b), respectively As the above results show, regardless of the type of traffic or the models, ... disabled throughout the communications The TCP and UDP results show that delay of the ACFNC model and standard model have the same pattern and level of variations This proves that the four bytes...
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