Author
Jason Weiss
Other affiliations: Ben-Gurion University of the Negev, Clemson University, Purdue University ...read more
Bio: Jason Weiss is an academic researcher from Oregon State University. The author has contributed to research in topics: Shrinkage & Cementitious. The author has an hindex of 50, co-authored 205 publications receiving 7631 citations. Previous affiliations of Jason Weiss include Ben-Gurion University of the Negev & Clemson University.
Topics: Shrinkage, Cementitious, Cement, Mortar, Cracking
Papers published on a yearly basis
Papers
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TL;DR: In this paper, an analytical stress formulation is presented to compute the actual residual stress level in the concrete using only the measured strain from the steel ring, and a comparison of the residual and theoretical elastic stress levels provides information about the extent of stress relaxation in a material.
Abstract: Recently, the American Association of State Highway and Transportation Officials implemented a provisional standard that uses the `ring test' to help quantify a materials' propensity for cracking. While this test may provide qualitative information that enables different mixtures to be compared, it does not provide quantitative information to describe how close a specimen is to failure. This paper will describe how the ring test may be used to provide quantitative information about stress development that may be used to assess the potential for cracking in concrete. An analytical stress formulation is presented to compute the actual residual stress level in the concrete using only the measured strain from the steel ring. The theoretical elastic stress is computed using the free shrinkage, ring deformation, and elastic modulus of the concrete. A comparison of the residual and theoretical elastic stress levels provides information about the extent of stress relaxation in a material. Continuously monitoring the strain that develops in the steel ring from the time of casting enables the effects of autogenous shrinkage to be determined as well as the effects of drying shrinkage.
266 citations
TL;DR: In this article, the influence of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage cracking behavior of concrete was examined under sealed and unsealed conditions, and the performance of each system was related to the cavitation of vapor-filled space in the paste, the SLWA spacing, and pore structure of the paste in relation to the LWA.
Abstract: Low water to cement ratio (w/c) concrete exhibits increased occurrences of early-age shrinkage cracking. These occurrences have spawned innovative developments in concrete mixture design that reduce the risk of cracking. One such development is internal curing, which utilizes the inclusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to cement paste as it hydrates thereby counteracting the effects of self-desiccation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed conditions. Specifically, the results indicate the influence of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage cracking behavior. The performance of each system is shown to be related to the cavitation of vapor-filled space in the paste, the SLWA spacing, and the pore structure of the paste in relation to the LWA.
253 citations
TL;DR: In this article, the porosity and physical features of the pore network were characterized using Electrical Impedance Spectroscopy (EIS), which was found to be an inaccurate indicator of the electrical conductivity of the sample.
234 citations
TL;DR: In this article, the influence of entrained air content on the rate of water absorption, the degree of saturation, and the relationship between the saturation level and freeze-thaw damage was examined.
Abstract: Fluid ingress is a primary factor that influences freeze-thaw damage in concrete. This paper discusses the influence of fluid ingress on freeze-thaw damage development. Specifically, this paper examines the influence of entrained air content on the rate of water absorption, the degree of saturation, and the relationship between the saturation level and freeze-thaw damage. The results indicate that whereas air content delays the time it takes for concrete to reach a critical degree of saturation it will not prevent the freeze-thaw damage from occurring. The results of the experiments show that when the degree of saturation exceeds 86–88%, freeze-thaw damage is inevitable with or without entrained air even with very few freeze-thaw cycles.
228 citations
TL;DR: Shrinkage reducing admixtures (SRA) have been developed to combat shrinkage cracking in concrete elements as discussed by the authors, which has been shown to have significant benefits in reducing the magnitude of drying and autogenous shrinkage, however, SRA may cause a negative side effect as it reduces the rate of cement hydration and strength development.
211 citations
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TL;DR: The Merck Index of Chemicals and Drugs is an encyclopedia for the Chemist, Pharmacist, Physician and Allied Professions and thumb-indexed, 8 dollars.
Abstract: The Merck Index of Chemicals and Drugs An Encyclopedia for the Chemist, Pharmacist, Physician and Allied Professions Sixth edition Pp xiv + 1167 (Rahway, NJ: Merck and Company, Inc, 1952) 750 dollars; thumb-indexed, 8 dollars
972 citations
TL;DR: In this paper, the growth of C-S-H is the principal factor controlling the main heat evolution peak and after several days space becomes the major factor controlling hydration, but deceleration cannot be attributed to diffusion control.
705 citations
TL;DR: In this article, the authors report recent advances in the knowledge base relevant to the durability of steel reinforced concrete in chloride environments, including: the role of mineral admixtures in concrete durability, the methods of measuring the chloride ingress into concrete, the challenges in assessing concrete durability from its chloride diffusivity, and the service life modeling of reinforced concrete.
643 citations
Journal Article•
TL;DR: In this paper, the authors examined the reactions of various concretes on steel reinforcement and concluded that the most significant influences on the corrosion of prestressing wire in concrete are: the presence of chloride, presence of nitrates, the composition of concrete, the degree of carbonation of the concrete; concrete compaction and chlorides and sulphates should be used as far as possible when steel is embedded.
Abstract: The author details the reactions of various concretes on steel reinforcement. Although portland cements, slag cements and high alumina cements are all hydraulic binders, each possess special properties which are examined. The discussion of causes and methods of preventing the corrosion of steel reinforcement covers such aspects as galvanised steel reinforcement, effects of concrete composition, corrosion of steel reinforcments in concrete and prestressed reinforcement. It is concluded that the most significant influences on the corrosion of prestressing wire in concrete are: the presence of chloride; the presence of nitrates; the composition of the concrete; the degree of carbonation of the concrete; concrete compaction and, chlorides and sulphates should be used as far as possible when steel is embedded. (TRRL)
621 citations
TL;DR: Nanocelluloses are natural materials with at least one dimension in the nano-scale as discussed by the authors, which combine important cellulose properties with the features of nanomaterials and open new horizons for materials science and its applications.
567 citations