Penetrability of lightweight aggregate concrete
Numerical analysis of externally prestressed concrete beams part 2
... surface of cross section -118- 900 21 50 21 50 27 5 D2 D1 1700 25 0 P 325 P 1800 1700 100 520 0 Beam s A1 and A2 21 50 21 50 900 27 5 P D2 D1 1700 1800 375 325 P 1700 520 0 Beam s B1 21 50 21 50 900 27 5 D1 D2 ... e2θ ; * v1 = v1 ; * v2 = v2 ; θ 1* = θ ; * 2 = 2 ; where e1 and e2 are the eccentricities of cable at the deviators and 2, respectively -114- (6.7) u2*,v2*,θ 2* Cable v1 u1 e2 v2 θ 2* 2 u2 ... responses of beams A1-B1 120 Applied load [kN] 100 80 60 40 Beam A2 20 Calc Exp Calc Exp 0.08 0.1 Beam B2 -0. 02 0. 02 0.04 0.06 0. 12 Displacement [m] b) Load-displacement responses of beams A2-B2 Fig.6.14...
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Numerical analysis of externally prestressed concrete beams part 1
... [K 11 ] 1 ({ΔF1 } + {R1 } − [K 21 ]{ΔU }) (2.22) {ΔF2 } = [K 22 ]{ΔU } + [K12 ]{ΔU } − {R2 } (2.23) K 12 ⎤ K 22 ⎥ ⎦ ⎧ ΔU ⎫ ⎬ ⎨ ⎩ΔU ⎭ (1) ⎧ ΔF ⎫ ⎧ R ⎫ = ⎨ 1 +⎨ 1 ⎩ΔF2 ⎭ ⎩ R2 ⎭ ⎡ K 11 ⎢K ⎣ 21 Solving ... (3 .18 a) 12 K 6K 12 K 6K ⎤ ⎡ ⎢0; − L3 ; − L2 ; 0; L3 ; − L2 ⎥ ⎣ ⎦ 12 K 1+ L2 (3 .18 b) ⎡ 12 ⎛ 12 K ⎞ 6 12 ⎛ 12 K ⎞ ⎤ 0; − + x; ⎜ − − ⎟ + x; 0; − x; ⎜ − ⎟ + x⎥ ⎢ L⎠ L ⎦ 12 K L L L L ⎝ L ⎝ L L ⎠ L 1+ ... element of matrix [Kc] can be defined as below equations: M N K c 11 = ∑∑ j =1 k =1 K c12 = M N ∑∑ M N L2 i b jk E jk j =1 k =1 K c13 = ∑∑ b jk E jk TsL4 i b jk E jk j =1 k =1 TsLi (q k +1 − q k...
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Standard Method of Test for Slump Loss of Portland Cement Concrete ppsx
... 3.5.2 Isolate the concrete from vibration for the duration of the test 3.5.3 Obtain concrete from the simulated in-place concrete and perform slump every hour until slump has reached the ... in-place slump Recover the simulated in-place concrete with plastic after each slump test 3.6 Part B Mixer Truck 3.6.1 Discharge approximately cubic foot of test batch concrete and perform slump, ... SCDOT’s Slump Loss Report, OMR Form 712.1 Rev 9/4/09 South Carolina Department of Transportation Slump Loss Report Time Slump from Slump from mixer truck in-place % Air (if air entrained) Concrete...
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Báo cáo nghiên cứu khoa học: "Analysis of Early-age cracking in restrained ring specimens of high performance concrete using finite element method" pdf
... the two rings are constantly in contact and as the concrete ring dies, strain gages monitor the steel ring strain In the finite element analysis the strain information was used as input using the ... the ring specimens using ANSYS software were modeled by cubic threedimensional as shown in Fig The elements of steel ring and concrete ring are continuous at nodes because the inner surface of concrete ... strength of concrete (f’ t) The ring specimens The FEM of the ring test was performed using the software of ANSYS The dimensions of the ring setup and the boundary conditions are shown in Fig The ring...
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control of cracking in concrete structures
... restraint needed for shrinkage-compensating concrete To take full advantage of the expansive potential of shrinkage-compensating concrete in minimizing or preventing shrinkage cracking of exposed concrete ... use of shrinkage-compensating concrete are contained in ACI 223R CHAPTER 4 CONTROL OF CRACKING IN FLEXURAL MEMBERS 4.1—Introduction The control of cracking can be as important as the control of ... found in ACI 209R Cracking due to drying shrinkage can never be eliminated in most structures This chapter covers cracking of hardened concrete due to drying shrinkage, factors influencing shrinkage,...
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guide for structural lightweight-aggregate concrete
... involvement before design Concrete, structural lightweight aggregate—See concrete, structural lightweight Concrete, structural lightweight (SLC) Structural lightweight-aggregate concrete made with structural ... kg/m3) (4-2) GUIDE FOR STRUCTURAL LIGHTWEIGHT-AGGREGATE CONCRETE 213R-13 Fig 4.2—Modulus of elasticity 1.5 Fig 4.1 Concrete density versus time of drying for structural lightweight concrete (Holm ... heavily reinforced normalweight concrete ) -( heavily reinforced lightweight concrete ) GUIDE FOR STRUCTURAL LIGHTWEIGHT-AGGREGATE CONCRETE 213R-33...
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protection of metals in concrete against corrosion
... factors that influence corrosion of reinforcing steel in concrete, measures for protecting em- PROTECTION OF METALS IN CONCRETE AGAINST CORROSION 222R-3 bedded reinforcing steel in new construction, ... Mehta, P K., “Effect of Cement Composition on Corrosion of Reinforcing Steel in Concrete, ” Chloride Corro- PROTECTION OF METALS IN CONCRETE AGAINST CORROSION sion of Steel in Concrete, STP 629, ... ACTIVE CORROSION IN CONCRETE 4.1—Introduction Corrosion- induced damage in reinforced concrete structures such as bridges, parking garages, and buildings, and the related cost for maintaining them in...
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standard practice for the use of shrinkage- compensating concrete
... counterbalanced by the dead weight of the slab itself STANDARD PRACTICE FOR SHRINKAGE -COMPENSATING CONCRETE The function of the top reinforcement is to balance the restraint of the subgrade, in ... relieves the expansive strains caused by the initial expansion of the shrinkage -compensating concrete 1.3—Scope and limits This standard practice is directed mainly toward the use of shrinkage -compensating ... effective for shrinkage -compensating concrete Because of the possibly greater slump loss, more liberal use and stricter enforcement of these controls is recommended when shrinkage -compensating concretes...
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control of deflection in concrete structures
... strain in the extreme compression fiber of a concrete element (0.003 in. /in. ) strain at first cracking load strain in prestressed reinforcement at ultimate flexure unit shrinkage strain in concrete ... nonprestressed reinforcement overall thickness of member depth of flange moment of inertia of cracked section transformed to concrete effective moment of inertia for computation of deflection moment of inertia ... evaluating the long-term deflection of a twoway reinforced concrete slab Chapter 5, “Reducing Deflection of Concrete Members,” gives practical and remedial guidelines for improving and controlling...
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control of deflection in concrete structuresstate-of-the-art report on fiber reinforced plastic (frp) reinforceme
... to unbonded FRP tendons 4.5.2 Deflections—Deflections of an uncracked concrete section reinforced with an unbonded FRP tendons may be computed using the guidelines of ACI 318 Once the section cracks, ... composite sections with in (25 mm) of concrete deck, failure occurred as a result of combined concrete spalling in the compression zone and shear between concrete inside the grating and concrete above ... strength of FRP reinforcing bar 2) splitting tensile strength of concrete 3) area of concrete cross section in tension 4) number of reinforcing bars in tension 5) size of reinforcing bar 6) effective...
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batching, mixing, and job control of lightweight concrete
... Gravity and Absorption of Fine Aggregate BATCHING, MIXING, AND JOB CONTROL OF LIGHTWEIGHT CONCRETE C 138 C 143 C 172 C 173 C 231 C 330 C 567 Standard Test Method for Unit Weight, Yield, and Air ... changes in the amount of water needed to produce the desired slump 3.2.1 Transportation and waiting time Construction BATCHING, MIXING, AND JOB CONTROL OF LIGHTWEIGHT CONCRETE jobs at different ... the possible range of full hopper weights is listed in the first or left-hand column BATCHING, MIXING, AND JOB CONTROL OF LIGHTWEIGHT CONCRETE 304.5R-5 Fig 2.3.2 Overhead bin and weighing hopper...
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guide for the use of preplaced aggregate concrete for structural and mass concrete applications
... view of the lack of any performance history, the use of PA concrete was limited to the repair of bridges and tunnel linings to extend their usefulness After extensive laboratory testing, the Bureau ... requirements limit the amount of fine aggregate (sand) that can be used in the grout For PA concrete for use in beams, columns, and thin sections, the ratio of cementitious material to sand 304.1R-8 ... reveal the weakening effect of excessive bleeding of the grout within the preplaced aggregate, nor does it account for the restraining effect on the expansion of the gas bubbles The next step is the...
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Cracking mode and shear strength of lightweight concrete beams
... CRACKING MODE AND SHEAR STRENGTH OF LIGHTWEIGHT CONCRETE BEAMS KUM YUNG JUAN (B.Eng (Hons.) Malaya) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL AND ENVIRONMENTAL ... Properties of Lightweight Concrete 23 2.4.1 Compressive Strength of Lightweight Concrete 23 2.4.2 Modulus of Elasticity and Poisson’s Ratio 25 2.4.3 Tensile Strength of Lightweight Concrete ... Lightweight Concrete Shear .45 2.8.3 2.9 ACI 318 Treatment of Lightweight Concrete Shear 43 Eurocode Treatment of Lightweight Concrete Shear 45 Conclusion .46 Chapter Cracking Modes of...
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Workability and stability of lightweight aggregate concrete from rheology perspective
... study on workability and stability of fresh lightweight aggregate concrete (LWAC) from rheology perspective It involves using rheological parameters of Bingham model, which are yield stress and plastic ... particles (Du and Folliard, 2005) and aggregate in normal-weight aggregate concrete In lightweight aggregate concrete (LWAC), however, the floatation forces of the air bubbles and lightweight aggregates ... 150 7.3 EFFECT OF FREQUENCY AND AMPLITUDE ON STABILITY OF CONCRETE .155 7.4 EFFECT OF VIBRATORY ACCELERATION ON STABILITY OF CONCRETE 162 7.5 INTRODUCTION 150 SUMMARY AND CONCLUSIONS...
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Penetrability of lightweight aggregate concrete
... ratio, size of lightweight aggregate, density of lightweight aggregate and volume of lightweight aggregate has reasonable effects on penetrability properties of lightweight aggregate concrete The ... penetrability of concrete for three different types of concretes: normal weight granite concrete (NWC), lightweight aggregate concrete (LWAC) and recycled aggregates concrete (RAC) The penetrability of concrete ... strength of recycled aggregate concrete 82 Table 4.3: Summary of recycled concrete aggregate penetrability properties 86 Table 4.4: Summary of R2 Values 87 Table 4.5: Summary of Penetrability of concrete...
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Từ khóa: 4—physical and mechanical properties of structural lightweight aggregate concrete p 213r 125—design of structural lightweight aggregate concrete— lightweight aggregate concrete2—lightweight aggregate concrete in joints5—consolidation of preplaced aggregate concrete4—economy of lightweight concrete4—density of lightweight concrete2—structural efficiency of lightweight concretecontent of concrete for various sizes of coarse aggregate5—compressive strength of original concrete and recycled aggregate concrete4—compressive strength of original and recycled aggregate concrete bernier et al 1978—volume of coarse lightweight aggregate peproperties of autoclaved aerated concreteinfluence of zeolite additive on properties of autoclaved aerated concretehygric thermal and durability properties of autoclaved aerated concreteBáo cáo thực tập tại nhà thuốc tại Thành phố Hồ Chí Minh năm 2018Nghiên cứu sự biến đổi một số cytokin ở bệnh nhân xơ cứng bì hệ thốngBáo cáo quy trình mua hàng CT CP Công Nghệ NPVNghiên cứu tổ hợp chất chỉ điểm sinh học vWF, VCAM 1, MCP 1, d dimer trong chẩn đoán và tiên lượng nhồi máu não cấpNghiên cứu vật liệu biến hóa (metamaterials) hấp thụ sóng điện tử ở vùng tần số THzGiáo án Sinh học 11 bài 13: Thực hành phát hiện diệp lục và carôtenôitĐỒ ÁN NGHIÊN CỨU CÔNG NGHỆ KẾT NỐI VÔ TUYẾN CỰ LY XA, CÔNG SUẤT THẤP LPWANTrả hồ sơ điều tra bổ sung đối với các tội xâm phạm sở hữu có tính chất chiếm đoạt theo pháp luật Tố tụng hình sự Việt Nam từ thực tiễn thành phố Hồ Chí Minh (Luận văn thạc sĩ)Nghiên cứu khả năng đo năng lượng điện bằng hệ thu thập dữ liệu 16 kênh DEWE 5000Thiết kế và chế tạo mô hình biến tần (inverter) cho máy điều hòa không khíChuong 2 nhận dạng rui roKiểm sát việc giải quyết tố giác, tin báo về tội phạm và kiến nghị khởi tố theo pháp luật tố tụng hình sự Việt Nam từ thực tiễn tỉnh Bình Định (Luận văn thạc sĩ)Quản lý nợ xấu tại Agribank chi nhánh huyện Phù Yên, tỉnh Sơn La (Luận văn thạc sĩ)Tăng trưởng tín dụng hộ sản xuất nông nghiệp tại Ngân hàng Nông nghiệp và Phát triển nông thôn Việt Nam chi nhánh tỉnh Bắc Giang (Luận văn thạc sĩ)Tranh tụng tại phiên tòa hình sự sơ thẩm theo pháp luật tố tụng hình sự Việt Nam từ thực tiễn xét xử của các Tòa án quân sự Quân khu (Luận văn thạc sĩ)chuong 1 tong quan quan tri rui roNguyên tắc phân hóa trách nhiệm hình sự đối với người dưới 18 tuổi phạm tội trong pháp luật hình sự Việt Nam (Luận văn thạc sĩ)Giáo án Sinh học 11 bài 14: Thực hành phát hiện hô hấp ở thực vậtGiáo án Sinh học 11 bài 14: Thực hành phát hiện hô hấp ở thực vậtBÀI HOÀN CHỈNH TỔNG QUAN VỀ MẠNG XÃ HỘI