— lightweight aggregate concrete
guide for structural lightweight-aggregate concrete
... REPORT 1.2—Historical background 1.3—Terminology 1.4—Economy of lightweight concrete Chapter 2—Structural lightweight aggregates, p 213R-5 2.1—Internal structure of lightweight aggregates 2.2—Production ... 4.1—Scope 4.2—Method of presenting data 4.3—Compressive strength 4.4—Density of lightweight concrete 4.5—Specified-density concrete 4.6—Modulus of elasticity 4.7—Poisson’s ratio 4.8—Creep 4.9—Drying ... C 331 (See aggregate, structural -lightweight, and aggregate, masonry -lightweight. ) Aggregate, lightweight See aggregate, structural lightweight; aggregate, masonry lightweight; or aggregate, ...
Ngày tải lên: 24/10/2014, 15:47
Workability and stability of lightweight aggregate concrete from rheology perspective
... 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 are in the ... related to plastic viscosity LWA lightweight aggregate LWAC lightweight aggregate concrete MI Mass Deviation Index N rotational speed NWAC normalweight aggregate concrete Ri radius of inner cylinder ... also developed lightweight concrete by using pumice, a very lightweight rock, as an aggregate Aggregates, made of stone or sand, are the main raw material used in the making of concrete During...
Ngày tải lên: 16/09/2015, 08:30
Penetrability of lightweight aggregate concrete
... Abbreviations LWA Lightweight aggregate LWAC Lightweight aggregate concrete LWC Lightweight concrete NWA Normal weight aggregate NWC Normal weight concrete RCA Recycled concrete aggregate w/c water-cement ... in lightweight aggregate on properties of lightweight aggregate concrete was not obvious from this research When comparing trends for normal weight granite concrete and 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...
Ngày tải lên: 13/10/2015, 15:55
guide for the use of preplaced aggregate concrete for structural and mass concrete applications
... PA concrete resulting from the 5.3-Chilling aggregate before placement Because of the time delay between aggregate place- PREPLACED AGGREGATE CONCRETE ment and grout injection, cooling of the aggregate ... Fluidifier for Preplaced -Aggregate Concrete C 938 Practice for Proportioning Grout Mixtures for Preplaced -Aggregate Concrete C 939 Test Method for Flow of Grout for PreplacedAggregate Concrete (Flow Cone ... onto vibrating decks or revolving wash screens 4.5.2 Aggregate placement-Coarse aggregate is PREPLACED AGGREGATE CONCRETE Fig 14-Flow of coarse aggregate through tremie pipe for embedment of draft...
Ngày tải lên: 24/10/2014, 17:44
standard practice for selecting proportions for structural lightweight concrete
... structural grade, lightweight aggregates, and structural lightweight aggregate concretes Structural lightweight aggregate concrete is defined as concrete which: (a) is made with lightweight aggregates ... weight aggregate SELECTING PROPORTIONS FOR STRUCTURAL LIGHTWEIGHT CONCRETE 211.2-11 Fig 3.3.4(b)—Strength versus cement content Fig 3.3.4(a)—Design chart for uncombined aggregates for lightweight concrete ... factor of the lightweight coarse aggregate and the air content of the SELECTING PROPORTIONS FOR STRUCTURAL LIGHTWEIGHT CONCRETE Table 3.2.2.5—First estimate of weight of fresh lightweight concrete...
Ngày tải lên: 24/10/2014, 17:40
batching, mixing, and job control of lightweight concrete
... water-cement ratio or the slump of the concrete 2.2 Absolute volumes Lightweight concrete uses lightweight aggregate particles in place of normal weight aggregates to the extent necessary to ... chart for 7.0 yd3 of concrete Table 2.3.3(b) Batching chart for 5.0 m3 of concrete OVERHEAD LIGHTWEIGHT OVERHEAD LIGHTWEIGHT / NG H OVERHEAD OVERHEAD LIGHTWEIGHT HINGED RAFFLE LIGHTWEIGHT FIXED ... slump test for lightweight concrete is performed exactly the same as for normal weight concrete The slump of lightweight concrete should be about two-thirds that of normal weight concrete to produce...
Ngày tải lên: 24/10/2014, 17:44
Cracking mode and shear strength of lightweight concrete beams
... lightweight aggregate 12 concrete, lightweight aggregate- foamed concrete and foamed concrete Material strengths will range from 30 to 40 MPa for lightweight aggregate- foamed concrete and foamed concrete ... produced foamed concrete (Grutzeck 2005) Lightweight aggregate- 20 foamed concrete meanwhile has also been known to be referred to as hybrid concrete 2.3 Lightweight Aggregates Lightweight aggregates ... on lightweight concrete beams to examine the applicability of existing theories and design codes to lightweight concrete especially high-strength lightweight aggregate concrete and foamed concretes...
Ngày tải lên: 10/09/2015, 15:48
Mechanical and deformational properties, and shrinkage cracking behaviour of lightweight concretes
... investigations Lightweight Concretes (LWC) HSLWC Conventional LWC No-fines concrete Aerated concretes Lightweight aggregate concretes Aerated concrete # Chemical aeration Low density concretes: ρ ... of lightweight concretes The study reported in this thesis addresses the role of constituent materials of different lightweight concrete (LWC) – foamed concrete without aggregate (FC), foamed concrete ... *(#) Structural concretes: ρ: 1120 (1440) – 1920 (1850) kg/m3 and f’c > 17 (17.24) MPa Note: HSLWC- high strength lightweight concrete; Lightweight aggregate foamed concrete Foamed concrete ρ -...
Ngày tải lên: 11/09/2015, 09:07
Lightweight Remote Procedure Call
... between abstract and concrete threads The programmer’s view is one of a single, abstract thread crossing protection domains, while the underlying control transfer mechanism involves concrete threads ... linkage, and dispatches the client’s concrete thread directly to the server domain The client provides the server with an argument stack as well as its own concrete thread of execution When the ... trademark of AT&T Bell Laboratories ACM Transactions on Computer Systems, Vol 8, No 1, February 1990 Lightweight Remote Procedure Call Table I Operating l 41 Frequency of Remote Activity system Percentage...
Ngày tải lên: 12/09/2012, 14:40
Numerical analysis of externally prestressed concrete beams part 2
... of the lack of bond between the concrete and the cable -110- External Cable Imaginary concrete strain at cable level Deviator Concrete beam Fig.6.1 Imaginary concrete strain at the cable level ... show the general behavior of prestressed concrete beams with external cables Crushing of concrete Typical beam Beam with large eccentricities Crushing of concrete Fig.6.10 Ultimate state of beams ... cross section, the concrete, therefore, does not exist at the cable level Therefore, it is difficult to say, however, that the global compatibility requirement between the concrete and the cable,...
Ngày tải lên: 07/11/2012, 11:04
Numerical analysis of externally prestressed concrete beams part 1
... prestressed concrete bridges consisting of concrete flanges and folded steel web or extradosed bridges with a short tower In this chapter, the definition of post-tensioned prestressed concrete beams ... post-tensioned prestressed concrete beams An initial distinction is helpful when dealing with definition of prestressed concrete structures A post-tensioned prestressed concrete beams may be classified ... prestressing cables in the tension zone Prestressed Concrete Beams Bonded Prestressed Concrete Beams Perfectly Bonded Unbonded Prestressed Concrete Beams Partially Bonded Internally Unbonded...
Ngày tải lên: 07/11/2012, 11:04
BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE (ACI 318-99) AND COMMENTARY
... 10.16—Composite compression members 10.17—Bearing strength CHAPTER 11—SHEAR AND TORSION 318-133 11.0—Notation 11.1—Shear strength 11.2 Lightweight concrete 11.3—Shear strength provided by concrete ... 17.3—Shoring CHAPTER 18—PRESTRESSED CONCRETE 318-257 18.0 18.1 18.2 18.3 18.4 —Notation —Scope —General —Design assumptions —Permissible stresses in concrete Flexural members 18.5 —Permissible stresses ... the fine aggregate consists of normal weight sand is termed “sand -lightweight concrete. ” Concrete, lightweight — By code definition, sand -lightweight concrete is structural lightweight concrete...
Ngày tải lên: 03/08/2013, 11:24
ACI structural engineering handbook 04 structural concrete design
... 1—Interior panels Negative moment at: Continuous edge Discontinuous edge Positive moment at midspan 0.033 — 0.025 0.040 — 0.030 0.048 — 0.036 0.055 — 0.041 0.063 — 0.047 0.083 — 0.062 0.033 — ... Structural Concrete Design 4.1 4.2 4.3 4.4 4.5 Properties of Concrete and Reinforcing Steel Properties of Concrete • Lightweight Concrete • Heavyweight Concrete • High-Strength Concrete • Reinforcing ... Case 5—Four edges discontinuous Negative moment at: Continuous edge Discontinuous edge Positive moment at midspan — 0.033 0.050 — 0.038 0.057 — 0.043 0.064 — 0.047 0.072 — 0.053 0.080 — 0.055...
Ngày tải lên: 17/08/2013, 12:06
Tài liệu Bài viết học thuật cho ABC Method Abstract Concreteness doc
... -Thông qua hai toán trên, có đầy đủ kết cần thiết (background) để bước vào giới ABC, Abstract Concreteness J Định lý 1: Nếu f (abc, ab + bc + ca, a + b + c ) hàm đơn điệu R theo abc cực đại ... a + b + c đạt giá trị nhỏ hai ba biến a, b, c Các bạn thấy tư tưởng trừu tượng cụ thể (abstract concreteness) rõ rang chứng minh Chúng ta không cần biết giá trị nhỏ ab + bc + ca hay a + b + c...
Ngày tải lên: 15/12/2013, 14:15
aggregate demand and supply analysis
... primary source of changes in aggregate spending and thus shifts the AD curve Aggregate Demand Curve Behaviour of Aggregate Demand’s Component Parts YAD = C + I + G + NX The aggregate demand curve ... shift AD to the right Factors That Shift the Aggregate Demand Curve I Factors That Shift the Aggregate Demand Curve II Aggregate Supply • Long-run aggregate supply curve (LRAS) – Determined by ... Aggregate Demand • Aggregate Demand - The relationship between the quantity of aggregate output demanded and the price level when all other...
Ngày tải lên: 05/01/2014, 17:01
