earlyage behavior of lightweight aggregate concrete
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earlyage behavior of lightweight aggregate concrete.

Early-Age Behavior of Lightweight Aggregate Concrete

Early-age cracking can be a severe problem in concrete as it can reduce the service life of the structure. In this project the early-age behavior of concrete was measured, evaluated, and modeled. The early-age stress development of concrete was measured with rigid cracking frames. The free strain was measured with a

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Early-Age Behavior of Lightweight Aggregate Concrete

Nov 22, 2011  The B3 compliance model was modified to accurately model the early-age stress development, and the effect of lightweight aggregates on relaxation was examined. Increasing the amount of pre-wetted lightweight aggregate in the concrete systematically decreases the density, modulus of elasticity, coefficient of thermal expansion, and thermal ...

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Effect of Lightweight Aggregates on early-age behavior of ...

Jan 01, 2020  Laboratory experiments were conducted to investigate the effects of locally available natural lightweight aggregates (LWA’s) on volume changes and mechanical properties of highperformance concrete (HPC). The normal aggregates fraction of high-performance concrete was replaced with fine and coarse LWA’s at three different replacement levels, 5%, 10% and 20% by volume.

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Early-Age Cracking of Lightweight Mass Concrete

Jan 01, 2020  The development of early-age concrete stresses caused by autogenous and thermal shrinkage effects were measured from setting to cracking. The behavior of concretes containing lightweight aggregates was compared with normal-weight concrete placed under temperature conditions simulating fall placement in mass concrete applications.

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Early-age behavior of recycled aggregate concrete under ...

May 20, 2017  Pore characterization of manufactured aggregates: recycled concrete aggregates and lightweight aggregates Mater. Struct. , 45 ( 2011 ) , pp. 67 - 79 , 10.1617/s11527-011-9749-2

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Effect of lightweight aggregate type on early-age ...

Sep 01, 2016  1. Introduction. Shrinkage of normal concrete (NC) mainly takes place in two distinct stages: early-age and later age. The early age is commonly defined as the first day when the concrete is cast and starts to harden, while the later age refers to the concrete at an age of 24 h and beyond .Early-age shrinking, occurring immediately after casting, is an unfavorable phenomenon because the ...

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Effect of Lightweight Aggregates on early-age behavior of ...

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Tensile basic creep behavior of lightweight aggregate ...

Mar 10, 2019  The objective of this study is to investigate the effect of the steel fiber (STF) contents (0, 0.5%, 1% and 2%) on the tensile basic creep behavior of lightweight aggregate concrete (LWAC) during the early-age and the overall 14 d.

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Early-Age Cracking of Lightweight Mass Concrete - GCO Portal

Feb 19, 2020  The behavior of concretes containing lightweight aggregates was compared with normal-weight concrete placed under temperature conditions simulating fall placement in mass concrete applications. Increasing the amount of pre-wetted lightweight aggregates in concrete results in systematic decrease in density, reduced modulus of elasticity, and ...

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Influence of prewetted lightweight aggregates on the ...

Nov 30, 2015  The water-to-cement ratio of HPC is low, and self-desiccation and high temperature rise occur. Internal curing (IC) with prewetted lightweight aggregates (LWAs) is applied to enhance the early-age behavior of concrete structures in terms of temperature, shrinkage, creep deformation, and stress, thus resulting in low cracking potential.

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Effect of Lightweight Aggregates on early-age behavior of ...

Laboratory experiments were conducted to investigate the effects of locally available natural lightweight aggregates (LWA’s) on volume changes and mechanical properties of highperformance concrete (HPC). The normal aggregates fraction of high-performance concrete was replaced with fine and coarse LWA’s at three different replacement levels, 5%, 10% and 20% by volume.

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CRACKING TENDENCY OF LIGHTWEIGHT CONCRETE

autogenous stresses is due to internal curing, because water is desorbed from the lightweight aggregates to fill capillary voids formed by chemical shrinkage. When compared to a normalweight control concrete, the use of lightweight aggregates in concrete effectively delays

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Effect of lightweight aggregate type on early-age ...

Abstract The effect of lightweight aggregate (LWA) type on the early-age autogenous shrinkage of lightweight aggregate concrete (LWAC) was investigated based on a corrugated tube testing method. The study reveals that the early-age autogenous shrinkage includes liquid phase, skeleton-formational phase and hardening phase, and is also affected by cylinder compression strength and water ...

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(PDF) Early-Age Cracking of Lightweight Mass Concrete

Internal curing using fine lightweight aggregate is an effective method to address early-age cracking. This study focuses on the sustainability of using fine lightweight aggregates for internally ...

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The Influence of Lightweight Aggregate on Internal Curing ...

normal fine aggregate with an expanded fine lightweight aggregate (LWA). For this study, the free and restrained autogenous shrinkage behavior was quantified for two field mixtures: a high performance concrete (HPC) and an internally cured high performance concrete (IC-HPC).

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Early Age Cracking Risk of High-Strength Lightweight ...

Mar 22, 2006  Early age cracking may be what is commonly known as "plastic shrinkage cracking", which normally is cracking of horizontal surface before and during setting (initial phase), and "thermal cracking" which normally is in the period of cooling following the period of temperature rise

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BEHAVIOR OF LIGHTWEIGHT AGGREGATE CONCRETE

BEHAVIOR OF LIGHTWEIGHT AGGREGATE CONCRETE FILLED STEEL TUBULAR SLENDER COLUMNS UNDER AXIAL COMPRESSION Fu Zhong-qiu 1, Ji Bo-hai 2,*, Lv Lei 3 and Zhou Wen-jie 3 1 PhD Candidate, College of Civil and Transportation Engineering Hohai University,

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The Influence of Lightweight Aggregate on Internal Curing ...

In North America, internal curing is typically achieved by replacing a portion of the normal fine aggregate with an expanded fine lightweight aggregate (LWA). For this study, the free and restrained autogenous shrinkage behavior was quantified for two field mixtures: a high performance concrete (HPC) and an

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Modeling early-age stress development of restrained concrete

Oct 17, 2013  Byard BE (2011) Early-age behavior of lightweight aggregate concrete. Dissertation, Auburn University. 13. Byard BE, Schindler AK (2010) Cracking tendency of lightweight concrete. Research Report. Highway Research Center, Auburn, AL. 14. Carino NJ (2004) The maturity method.

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Effect of internal curing on behavior of high performance ...

Jun 01, 2019  Byard and Schindler [], Babcock and Taylor [], and Song et al. [] investigated the HPCIV and its effect on voids in the dense cement matrix to support IC.Francis et al. [] focused on the HPCII behavior of with different percentages of LWA.LW fine aggregates were obtained from a sandstone quarry with different percentage replacements 10%–50% with normal-weight aggregate.

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STRUCTURE magazine Improved Bridge Deck Performance with ...

The compressive strengths for the all-lightweight concretes were approximately 13% to 19% lower when compared to those of the normalweight control concrete. The modulus of elasticity results of some of these concretes are shown in Figure 1b. The modulus of elasticity of

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Bond Behavior of Deformed Bars in Self-Compacting ...

Self-compacting lightweight aggregate concrete (SCLC) has attracted growing attention because of its self-compacting performance and good workability, thus the mechanical properties of SCLC and the structural performances of RC components made of SCLC have been widely studied.

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Finite-Element Modeling of Early-Age Concrete Behavior

Aug 04, 2018  measures will reduce the risk of early-age cracking in cast-in-place concrete culverts: lower coefficient of thermal expansion concrete, contraction joints, sand-lightweight concrete or all-lightweight concrete, scheduling the casting of the culvert wall to minimize the difference in its

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(PDF) Shrinkage Behavior of Conventional and ...

Recycled aggregate concrete with a replacement of 20% had similar shrinkage to normal concrete at an early age and a 4% higher within the first 6 months. A 50% replacement resulted in around 10% higher shrinkage than that in normal concrete, while 100% replacement caused about 70% greater shrinkage compared to the control mixture concrete for ...

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Cracking Tendency of Lightweight Aggregate Bridge Deck ...

Cracking Tendency of Lightweight Aggregate Bridge Deck Concrete Early-age cracking in bridge decks is a severe problem that may reduce the functional life of the structure. In this project, the effect of using lightweight aggregate on the cracking tendency of bridge deck concrete was evaluated using testing frames that restrain movement due to ...

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Lightweight Aggregate Concrete - MDPI

Dec 19, 2019  Materials 2020, 13, 20 4 of 13 where Mis the maximum bending moment, Ig is the moment of inertia of the non-cracked gross section, and Elc is the modulus of elasticity of lightweight aggregate concrete calculated by the following formula: E lc = 0.043ˆ1.5 p fc, (6) where fc is the compressive strength (in MPa). The e ective moment of inertia of the cracked cross section is calculated by ...

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Industry News - America's Leader in Lightweight Aggregate

Study: Effect of Lightweight Aggregate on Early-Age Cracking of Mass Concrete Published. The January 2020 issue of the American Concrete Institute's ACI Materials Journal features an important study on the behavior of concrete containing lightweight aggregates in mass concrete applications. Continue Reading.

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STRUCTURE magazine Improved Bridge Deck Performance with ...

The compressive strengths for the all-lightweight concretes were approximately 13% to 19% lower when compared to those of the normalweight control concrete. The modulus of elasticity results of some of these concretes are shown in Figure 1b. The modulus of elasticity of

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"Shrinkage and shrinkage cracking behavior of cement ...

Low water-to-cement (w/c) ratio concrete with a high paste content experiences significant autogenous shrinkage that may amplify the risk of earlyage cracking in restrained elements. Further, the high cement content of these materials increases the carbon-footprint and environmental impact of these materials due to energy consumption and CO2 emissions associated with cement production.

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Modeling early-age stress development of restrained concrete

Oct 17, 2013  Byard BE (2011) Early-age behavior of lightweight aggregate concrete. Dissertation, Auburn University. 13. Byard BE, Schindler AK (2010) Cracking tendency of lightweight concrete. Research Report. Highway Research Center, Auburn, AL. 14. Carino NJ (2004) The maturity method.

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CHAPTER 5 ENGINEERING PROPERTIES OF STRUCTURAL LOW

lightweight aggregate, there will be essentially no increase in strength. Figure 7.1 demonstrates that the compressive strength ceiling for the particular 3/4 in. (20.0-mm) maximum size lightweight aggregate tested was about 8,000 psi (55 MPa) at a concrete age of 75 days (Holm 1980a). When the maximum size of this

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Lightweight Aggregate Concrete (LWAC) Scientific.Net

Abstract: High performance lightweight aggregate concrete is a kind of lightweight environment-protected building material with high strength, good workability, volume stability and durability, which is widely used in large scale engineering and some important engineering.

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The Effect of Elevated Temperature on the Lightweight ...

Lightweight aggregate concrete was first presented by the Romans in the Mediterranean region 2000 years ago where ‘The Roman temple Pantheon, Port of Cosa and the Coliseom have been built using lightweight aggregate [1]. From there on, the use of lightweight concrete has been widely spread across other countries such as USA, United Kingdom ...

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Incorporation of Phase Change Materials in Lightweight ...

aggregates and lightweight coarse aggregates that functioned as PCM carriers. The concrete specimens were tested and compared to reference compositions against properties of fresh and hardened concrete, thermal behavior, heat capacity, hydration heat and products, as well as their flammability. Finally, to determine the correlation of PCM

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Lightweight Aggregates Lightweight concrete aggregates typically absorb, retain, and release significantly more water than normal weight aggregates. In fact, lightweight aggregates have been shown to contribute to the curing process by slowly releasing water over time as shown by Ben Byard and others.i Although a desirable behavior in many ...

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Effect of lightweight aggregate type on early-age ...

Abstract The effect of lightweight aggregate (LWA) type on the early-age autogenous shrinkage of lightweight aggregate concrete (LWAC) was investigated based on a corrugated tube testing method. The study reveals that the early-age autogenous shrinkage includes liquid phase, skeleton-formational phase and hardening phase, and is also affected by cylinder compression strength and water ...

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Experimental and Numerical Studies of Impact Behavior of ...

report on impact behavior of fiber reinforced lightweight aggregate concrete. In this research, cylindrical fiber lightweight aggregate concrete samples with 150 mm diameter and 60 mm thickness are exposed to low velocity impact load (according to the

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A STUDY ON THE CREEP AND SHRINKAGE OF HIGH

lightweight aggregate concrete with low water absorption and high strength made from Huang River clay deposits in China to apply to the prestressed concrete structures, such as superstructures of bridges (Photo-1). Hereinafter “high performance lightweight aggregate” and “high performance lightweight concrete” are

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