Recently added articles from ACI Materials Journal:
Assessment of Damage Gradients Using Dynamic Modulus of Thin Concrete Disks
Sep 01, 2008; ... Thin circular disks sawn from cylinders or cores are widely used in the measurement of chloride or air permeability of concrete and water-soluble chloride penetration into concrete. Whereas these methods provide useful information on concrete properties with depth, the capability of measuring ...
Impact of Extremely Hot Weather and Mixing Method on Changes in Properties of Ready Mixed Concrete during Delivery
Sep 01, 2008; ... Changes in concrete temperature, slump, and compressive strength during delivery of ready mixed concrete (RMC) were investigated under the extremely hot, dry environment of Riyadh in central Saudi Arabia. A total of 80 delivery trucks were tested representing three plants using a central-mixing ...
Maturity Approach Applied to Concrete by Means of Vicat Tests
Sep 01, 2008; ... Better knowledge of the time of initial setting of concrete would aid contractors in planning the times of texturing and finishing a pavement. With this aim in mind, this paper presents a straightforward method for evaluating the temperature influence on setting time. This was accomplished using ...
Restored Strength of Cracked Concrete Beam Repaired by Epoxy and Polymethyl Methacrylate
Sep 01, 2008; ... This paper presents a research work on the bonding characteristics of epoxy mortar and polymethyl methacrylate (PMMA)-based mortar to repair concrete cracks. The feasibility of using both materials to repair various types of cracks of various widths in concrete is examined. The propagation path ...
Parameters Governing Corrosion Protection Efficacy of Fusion-Bonded Epoxy Coatings on Reinforcing Bar
Sep 01, 2008; ... The purpose of this study was to investigate the epoxy-coated reinforcing steel (ECR) corrosion abatement condition of specimens extracted from bridge decks in Virginia. The following parameters were investigated: coating thickness, coating residual adhesion by the peel test, holidays, coating ...
Shear Behavior of Fiber-Reinforced Self-Consolidating Concrete Slender Beams
Sep 01, 2008; ... A detailed investigation on the shear behavior of fiber-reinforced self-consolidating concrete (FR-SCC) beams was carried out. FR-SCC mixtures were designed to study the influence of: a) fiber type; b) fiber anchorage; c) fiber aspect ratio; and d) fiber content on the shear performance of ...
Performance of Shrinkage-Reducing Admixtures at Different Humidities and at Early Ages
Sep 01, 2008; ... Shrinkage-reducing admixtures (SRAs) have been developed to reduce the risk of early-age shrinkage cracking in concrete. While substantial results are available in the literature to illustrate how SRAs influence the free shrinkage of mixtures tested in accordance with ASTM C157, fewer results ...
Use of Ultra-Fine Sugar Cane Bagasse Ash as Mineral Admixture for Concrete
Sep 01, 2008; ... Sugar cane bagasse ash (SCBA) is generated as a combustion by-product from boilers of sugar and alcohol factories. Composed mainly of silica, this by-product can be used as a mineral admixture in concrete. In this investigation, conventional and high-performance concretes (CCs and HPCs, ...
Investigation of Air-Entraining Admixture Dosage in Fly Ash Concrete
Sep 01, 2008; ... The amount of air-entraining admixture (AEA) needed to achieve a target air content in fresh concrete can vary significantly with differences in the fly ash used in the concrete. The work presented in this paper evaluates the ability to predict the AEA dosage on the basis of tests on the fly ash ...
Crack Depth Estimation in Concrete Using Energy Transmission of Surface Waves
Sep 01, 2008; ... The self-calibrating surface wave transmission method is a promising nondestructive technique for surface-breaking crack depth inspection of concrete. Determination of crack depth using the cut-off frequency in the transmission function (TRF) is difficult, however, in part due to the variability ...
Effect of Mixture Composition on Restrained Shrinkage Cracking of Self-Consolidating Concrete Used in Repair
Sep 01, 2008; ... Given its mixture design, which often involves the incorporation of a relatively high content of cement paste and low volume of coarse aggregate, self-consolidating concrete (SCC) can inherently exhibit greater risk of drying shrinkage and restrained shrinkage cracking compared with conventional ...
High-Temperature Properties of Concrete for Fire Resistance Modeling of Structures
Sep 01, 2008; ... Fire represents one of the most severe environmental conditions to which structures may be subjected and, hence, the provision of appropriate fire safety measures for structural members is an important aspect of design. The recent introduction of performance-based codes has increased the focus ...
Advanced Assessment of Cracking due to Heat of Hydration and Internal Restraint
Jul 01, 2008; ... The control of temperature difference across a section is an effective strategy to minimize hydration-heat-induced cracking in structures where internal restraint is dominant. Some related provisions, however, tend to overestimate the probability of crack occurrence compared with construction ...
Properties of Concrete after High-Temperature Heating and Cooling
Jul 01, 2008; ... Previous experimental studies on concrete under high temperatures have mainly concentrated on the reduction of stiffness and strength properties. Various experimental parameters have been examined such as maximum temperature, heating rate, types of aggregates used, various binding materials, and ...
Methodology to Couple Time-Temperature Effects on Rheology of Mortar
Jul 01, 2008; ... The evolution of rheological properties of cement-based materials during the dormant period of cement hydration depends on the coupled effect of temperature and time. Highly flowable concrete is increasingly being used to facilitate construction. Such concrete should be optimized to account for ...
Measurement of Reinforcement Corrosion Rate Using Transient Galvanostatic Pulse Method
Jul 01, 2008; ... A galvanostatic pulse transient response technique was investigated to evaluate the corrosion rate of steel reinforcement in concrete structures. Galvanostatic pulse transient measurements were conducted on a number of short sections of steel bar embedded in concrete. The duration of an applied ...
Large-Scale Processing of Engineered Cementitious Composites
Jul 01, 2008; ... The design, processing, and evaluation of engineered cementitious composites (ECC) is investigated at large scales, up to 3 m^sup 3^ (4 yd^sup 3^). The design of ECC is undertaken to retain the pseudo-tensile strain-hardening properties characteristic of high-performance fiber-reinforced ...
Recycling Waste Latex Paint in Concrete with Added Value
Jul 01, 2008; ... With increasingly more stringent environmental regulations and the development of municipal waste collection programs, waste latex paint (WLP) has developed into the largest liquid waste material (by volume) being collected in North America. Thus, its disposal has become a major concern for ...
Validation of Probability-Based Chloride-Induced Corrosion Service-Life Model
Jul 01, 2008; ... The deterioration of bridge decks due to chloride-induced corrosion is a major problem in North America. Chlorides are primarily the result of deicing salt applications on the bridge deck surface. The ingress of chlorides into concrete is typically modeled using Fick's second law of diffusion ....
Prediction of Early-Age Cracking of Fiber-Reinforced Concrete due to Restrained Shrinkage
Jul 01, 2008; ... Fibers are increasingly being added to concrete mixtures enhance the cracking resistance of concrete. In this study, a method to predict cracking of fiber-reinforced concrete due to restrained drying shrinkage is proposed, and a comparison between test data and analysis results is made. In the ...