Recently added articles from ACI Materials Journal:

Ultrasonic Transmission to Monitor Setting and Hardening of Fly Ash Concrete

May 01, 2008; De Belie, Nele; Grosse, Christian; Baert, Gert ... The effect of high replacement levels of cement by fly ash on the microstructural development of concrete was measured through nondestructive ultrasonic transmission measurements. Two different devices, equipped with an ultrasound impactor and ultrasound generator, respectively, were compared ....

Creep, Shrinkage, and Anisotropic Damage in Alkali-Aggregate Reaction Swelling Mechanism-Part I: A Constitutive Model

May 01, 2008; Grimal, Etienne; Sellier, Alain; Pape, Yann Le; Bourdarot, Eric ... Modeling the behavior of alkali aggregate reaction (AAR)-damaged concrete is made complex by the large number of elementary physical phenomena to be taken into account (concrete reactivity, thermal activation, moisture dependence, concrete rheology, and damage interaction). This paper presents ...

Creep, Shrinkage, and Anisotropic Damage in Alkali-Aggregate Reaction Swelling Mechanism-Part II: Identification of Model Parameters and Application

May 01, 2008; Grimal, Etienne; Sellier, Alain; Pape, Yann Le; Bourdarot, Eric ... This paper deals with parameter identification and model application of a finite element procedure developed for analysis of concrete structures affected by alkali-aggregate reaction (AAR). Theoretical aspects of the model (constitutive laws and underlying assumptions) have been presented and ...

Corrosion Resistance Performance of Steel-Reinforced Engineered Cementitious Composite Beams

May 01, 2008; Sahmaran, Mustafa; Li, Victor C; Andrade, Carmen ... This paper presents the results of an experimental investigation on steel-reinforced engineered cementitious composite (ECC) beams subjected to accelerated corrosion by an electrochemical method. ECC is a micromechanically-based designed, high-performance, fiber-reinforced cementitious composite ...

Correlating Flexural and Shear Toughness of Lightweight Fiber-Reinforced Concrete

May 01, 2008; Higashiyama, Hiroshi; Banthia, Nemkumar ... The purpose of this study was to assess the correlation between flexural toughness and shear toughness of normalweight and lightweight fiber-reinforced concretes (FRC). A crimped steel fiber with a crescent geometry was used throughout. For flexure, third-point loading tests were preformed as ...

Sugar Cane Wastes as Pozzolanic Materials: Application of Mathematical Model

May 01, 2008; Villar-Cociña, Ernesto; Rojas, Moisés Frías; Morales, Eduardo Valencia ... This paper proposes a kinetic-diffusive model that allows for determination of pozzolanic activity as related to optimum calcining temperature on the activation of wastes from sugar cane industries and their use as pozzolanic material. Research based on the reaction kinetics between lime ...

Effect of Internally Stored Water on Creep of High-Performance Concrete

May 01, 2008; Lopez, Mauricio; Kahn, Lawrence F; Kurtis, Kimberly E ... The effects of internally stored water on long-term deformations of high-performance concrete (HPC) were examined on 130 creep and shrinkage specimens and 150 compressive strength specimens. Creep and shrinkage were monitored for 500 days on sealed and unsealed concrete specimens using either ...

Effect of Moisture on Piezoresistivity of Carbon Fiber-Reinforced Cement Paste

May 01, 2008; Wen, Sihai; Chung, D D L ... Piezoresistivity, as exhibited by carbon fiber-reinforced cement-based material, allows a structural material to sense its strain or stress through electrical resistance measurement. This paper addresses the worst scenario associated with the effect of moisture on the piezoresistivity of carbon ...

Correlation between Paste and Concrete Flow Behavior

May 01, 2008; Hidalgo, Julissa; Chen, Chun-Tao; Struble, Leslie J ... The correlation between cement paste rheology and concrete workability in mixtures containing a polycarboxylated acrylate ester was initially seen as poor, in that the admixture dosage required to produce full dispersion in cement paste, as determined using dynamic rheology, was approximately ...

Influence of Type and Replacement Level of Recycled Aggregates on Concrete Properties

May 01, 2008; Yang, Keun-Hyeok; Chung, Heon-Soo; Ashour, Ashraf F ... Test results of nine recycled aggregate concretes and a control concrete using only natural aggregates are reported. The recycled aggregates used were classified into three different types according to their measured specific gravity and water absorption, namely, RG I for recycled coarse ...

Virtual Pervious Concrete: Microstructure, Percolation, and Permeability

May 01, 2008; Bentz, Dale P ... As the usage of pervious concrete continues to increase dramatically, a better understanding of the linkages between microstructure, transport properties, and durability will assist suppliers in mixture proportioning and design. This paper presents various virtual pervious concrete ...

Modeling Shrinkage of Portland Cement Paste

May 01, 2008; Lin, Feng; Meyer, Christian ... A multi-scale constitutive model that simulates the shrinkage of hardening cement paste is developed based on the theories of poromechanics and mechanics of composites. Capillary stress is considered the driving force of autogenous shrinkage. The applied pressure, which can be another driving ...