Recently added articles from ACI Materials Journal:
Geopolymer Extruded Composites with Incorporated Fly Ash and Polyvinyl Alcohol Short Fiber
Jan 01, 2009; ... A polyvinyl alcohol (PVA) short-fiber-reinforced fly ash geopolymer composite manufactured by extrusion technique (SFRFGC) was developed in this study. The effects of fly ash content and fiber volume fraction on the rheological and flexural behaviors of SFRFGC were systematically investigated ....
Effect of Embedded Steel on Electrical Resistivity Measurements on Concrete Structures
Jan 01, 2009; ... For corrosion of embedded steel in concrete structures, the electrical resistivity of the concrete is a very important controlling factor for the rate of corrosion. Therefore, measurements of electrical resistivity of the concrete are normally an important and integrated part of the measurements ...
Experimental Study of Wave Propagation through Grouted Concrete
Jan 01, 2009; ... The injection of cementitious grout into deteriorated civil structures is a common application for strengthening or repair purposes. The nondestructive estimation of the repair effect, which is always desirable, is not an easy task because geometry, constituent materials' property mismatch, and ...
Self-Consolidating Mortars Using Various Secondary Raw Materials
Jan 01, 2009; ... A study made on 15 series of self-consolidating mortars (SCMs) using different types of secondary raw materials (SRMs) at high replacement levels of cement is reported. SRM particle characterization and the flow behavior, strength development, microstructure, and early volume stability of SCMs ...
Shear Resistance of Lightweight Concrete Core of Fiber-Reinforced Polymer Concrete Sandwich Structure
Jan 01, 2009; ... This paper presents a model to predict the shear resistance of the unreinforced lightweight concrete core of a recently developed hybrid sandwich concept for bridge decks. The sandwich skins consist of a fiber-reinforced polymer (FRP) composite sheet for the tensile skin and a thin layer of ...
Effects of Cement and Water Contents on Adiabatic Temperature Rise of Concrete
Jan 01, 2009; ... The temperature rise of concrete during curing is dependent on the mixture composition and proportions, among which the cement content should be the major factor. If the water content is relatively low, however, the cement would not fully hydrate and the water content should also have ...
Flow and Compressive Strength of Alkali-Activated Mortars
Jan 01, 2009; ... Test results of 36 slag-based mortars and 18 fly ash (FA)-based mortars activated by sodium silicate and/or sodium hydroxide powders are presented. The main variables investigated were the mixing ratio of sodium oxide (Na^sub 2^O) of the activators to source materials, water-binder ratio (w/b), ...
Numerical Simulation of Wave Propagation in Mortar with Inhomogeneities
Jan 01, 2009; ... In this paper, wave propagation in concrete with inhomogeneity is examined using numerical simulations. Simulated damage is film-shaped to resemble the actual shape of cracks. Results of pulse velocity and wave distortion are compared with experimental ones, showing good agreement. It is ...
Evaluation of Coefficient of Thermal Expansion Test Protocol and Its Impact on Jointed Concrete Pavement Performance
Jan 01, 2009; ... A laboratory investigation was conducted to determine the coefficient of thermal expansion (CTE^sub PCC^) of typical concrete paving mixtures made with coarse aggregate from eight different sources in Michigan. The primary aggregate class included limestone, dolomite, slag, gravel, and trap ...
Influence of Concrete Material Ductility on Headed Anchor Pullout Performance
Jan 01, 2009; ... While steel anchors are widely used in the construction industry, the fracture failure problem of anchor/concrete connections associated with the inherent brittleness of concrete has not been fully resolved. In this paper, the influence of material ductility on the anchor pullout performance is ...
Concrete and Steel Type Influence on Probabilistic Corrosion Service Life
Jan 01, 2009; ... The deterioration of bridge decks due to chloride-induced corrosion remains a major proportion of the high rehabilitation costs of bridges in the U.S. The ingress of chloride through the cover concrete may be modeled as a Fickian diffusion process. A validated chloride-induced corrosion ...
Dynamic Properties of Plain Concrete in Triaxial Stress State
Jan 01, 2009; ... In this study, the dynamic behavior of plain concrete at high strain rates was experimentally investigated with over 60 cubic specimens using a custom-designed, triaxial, servo-hydraulic controlled testing machine. Each specimen was axially loaded by a gradually increasing force at a constant ...
Electrical Resistivity Measurements for Quality Control During Concrete Construction
Nov 01, 2008; ... For the production of new concrete structures in severe environments, requirements to chloride diffusivity are increasingly being used as a performance-based specification for concrete durability. As a basis for the concrete quality control during concrete construction, however, the testing of ...
Behavior of High-Performance Concrete under Uniaxial and Biaxial Loading
Nov 01, 2008; ... A systematic experimental research was carried out to investigate the mechanical properties of high-performance concrete (HPC). A total of 91 plate specimens were tested in four different loading conditions including uniaxial tension, uniaxial compression, biaxial compression, and tension ...
Identifying Viscosity of Cement Paste from Mini-Slump-Flow Test
Nov 01, 2008; ... Quality control of rheological properties is proving to be critical for the success of high-performance concretes such as self-consolidating concrete (SCC). Yet, there are no widely accepted tests that can quickly and accurately determine these properties. Currently, the slump-flow test is used ...
Design of Green Engineered Cementitious Composites for Improved Sustainability
Nov 01, 2008; ... The sustainability of the built environment is increasingly coming to the forefront of infrastructure design and maintenance decisions. To address this, development of a new class of more sustainable cement-based materials is needed. These materials should be developed with respect to the final ...
Loading Rate Effect on Pullout Behavior of Deformed Steel Fibers
Nov 01, 2008; ... This paper describes the results of single-fiber pullout tests under various loading rates ranging from the static to the seismic level. Investigation of the loading rate effect on single-fiber pullout behavior provides a basis to better understand the effect of strain rate on the tensile ...
Effect of Supplementary Cementitious Materials on Rheological Properties, Bleeding, and Strength of Structural Grout
Nov 01, 2008; ... Cement grouts used for crack injection, anchorage sealing, and post-tensioning applications are proportioned to exhibit high flowability to facilitate casting and adequate cohesion to prevent phase separation and bleeding. An experimental investigation was carried out to evaluate the effect of ...
Long-Term Durability of Blended Cement Against Sulfate Attack
Nov 01, 2008; ... Five different supplementary cementing materials (SCM) were investigated for their resistance to sodium sulfate attack using ASTM C1012. The results showed high-calcium fly ash (HCFA) to have the lowest resistance, which was attributable to its calcium-aluminate glass. The performance of HCFA ...
Cylinder or Cube: Strength Testing of 80 to 200 MPa (11.6 to 29 ksi) Ultra-High-Performance Fiber-Reinforced Concrete
Nov 01, 2008; ... Accurate determination of the compressive strength of very high strength concrete is currently a difficult proposition due to large testing machine capacity requirements and the need for cylinder end preparation. An experimental program was conducted to determine whether alternate specimen types ...