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The article focuses on a performance-based testing protocol to prevent pyrrhotite-related damage in concrete structures, emphasizing the need for early detection and assessment of sulfide-bearing rocks in quarries. It discusses the importance of incorporating geological factors, total sulfur content analysis, and petrographic examination to develop a comprehensive testing approach for identifying and mitigating the risk of pyrrhotite distress in concrete.

The article offers multiple news briefs including BeamerOne projects two-dimensional (2-D) or three-dimensional (3-D) digital plan onto construction surfaces (flat or curved) using an accurate laser from LightYX; and PMD 200 Jobsite Layout Tool from Hilti.

The article presents the discussion on concrete exhibiting deterioration resulting from contact with chemicals, minerals, or environmental conditions. Topics include common mechanisms of deterioration such as damage from freezing and thawing, salt attack, and carbonation; and high initial pH of new concrete providing a period of immunity to most bacterial growth.

The article offers information of Fiber-Reinforced Polymer Reinforcement for Concrete Members. Topics discussed include Fiber-reinforced polymer (FRP) offers new capabilities for structural and nonstructural applications in building construction; and FRP bars and meshes for use as concrete reinforcement have gained popularity by offering some distinct advantages such as resistance to corrosion, high stiffness-to-weight ratio, and relatively lower labor and handling costs.

The article offers information on the innovation in the formulation of alkali–silica reaction (ASR)-resistant mixtures. Topics discussed include determining alkali-silica aggregate reactivity by standardized testing procedures; mitigation evaluation of ASR using cements such as slag cement, fly ash and silica fume; and impact of threshold alkalinity-pore solution alkalinity relationship on mixture design .

The article presents answer to the question related to addressing shrinkage in hardened concrete and discusses the misconception that reducing the water-cement ratio effectively reduces shrinkage.

The article offers information on concrete sustainability to the elementary school classroom, as growing movement of advancing science, technology, engineering, arts, and math education in school curriculums. Topics discussed include presentation on basic concrete technology involving composition of concrete; opportunity in concrete and chemical admixtures to introduce the very relevant issue of sustainability in concrete construction; and sustainable use of leftover concrete by technology.

Copyright of Concrete International is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article reports on the concrete industry professionals attended the planning workshop for the Concrete Advancement Network (CAN), a proposed Industry-University Cooperative Research Center (IUCRC). It mentions that the workshop was made possible through a planning grant provided by the National Science Foundation (NSF).

The article presents the discussion on City of Phoenix Aviation Department extending the Phoenix Airport. Topics include construction of the beams requiring thermal control measures as well as highly workable concrete flowing easily around the dense reinforcement; and improving workability and reducing the heat of hydration in the mixture.

The article provides an answer to a question concerning the designing of concrete slab-on-ground for a commercial building installing a moisture-sensitive floor covering on the slab.

Copyright of Concrete International is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article discusses various aspects such as bulk freezing-and-thawing performance and hardened air void systems of concrete mixtures prepared from portland cement. It mentions that there was a difference in paste air contents in concrete mixtures made with wood rosin air-entraining admixture (AEA) and a lignosulfonates water-reducing admixture (MRWRA), and discusses the manufacturing of compressible microspheres to produce voids in concrete mixtures.

The article informs about designing baseplates that will be anchored using anchor rods embedded in a concrete pile cap as the strength of an anchor group is governed by concrete breakout. Topics include limited redistribution of forces between the highly stressed and less stressed anchors; and baseplate, assume a rigid baseplate from the assumed location of the compression reaction to the critical point on the baseplate.

The article discusses the factors that contribute to inadequate embedment that result in mortar flaking and aggregate shading. Damages are described which ranges from relatively small individual defects to limited craze cracking around a flake. Contributing factors are identified involving insufficient paste, insufficient or mistimed compactive effort, and movement of the screed bar. A challenging response is explained leading to a consistent, predictable concrete mixture.

The article focuses on concrete shrinkage. Causes of shrinkage cracking are identified including restraint of autogenous and chemical shrinkage strains, thermal strains, plastic shrinkage, and drying shrinkage. Evaluations of parameters are presented such as waste and paste contents, aggregates, and shrinkage-reducing admixtures (SRAs). The need for high-quality aggregates in the San Francisco Oakland Bay Bridge (SFOBB) projects is mentioned to produce the specified high-performance concrete.

The article discusses the use of recycled mixed glass powder (GP) as a supplementary cementitious material in concrete construction. Details related to field trials of GP concretes are included, including a slab and sidewalk at the Center for Sustainable Development in Montreal, Canada, recycling sorting center walls in Quebec, Canada, and sidewalks in the Museum District in Montreal, Canada. The trials evaluated the strength, volumetric change, and environmental durability of the material.

The article discusses the application of new concrete additive to aid concrete contractors avoid placing and finishing challenges in the U.S. It highlights the joint meeting of the Ohio Ready Mixed Concrete Association (ORMCA) and the American Society of Concrete Contractors (ASCC). The new additive called Elemix is a product consisting of lightweight synthetic particles (LSP) manufactured by SYNTHEON Inc.

The article evaluates products related to construction industry including the Powerblanket Pallet Warmers and the Sealants & Coatings Calculator Application from Pecora Corp. and also reviews the book "Science & Technology of Concrete Admixtures" edited by Pierre-Claude Aïtcin and others.

The article discusses the durability issue of lower water-cementitious material ratio (w/cm) concrete mixed with limestone fillers. It mentions that limestone fineness is important to avoid autogenous deformation that contributes to early-age cracking of concrete. It explains that coarser limestone cement replacements can reduce capillary stress and reactive particles which reduce the possibility of early-age cracking.

The article offers information on the 2-hour poster session titled "ACI 123 Concrete Research Student Poster Session" that will take place on March 30, 2020, at the ACI Concrete Convention.

The article discusses the role of fly ash and other supplementary cementitious materials in reducing carbon dioxide emissions. Low-calcium fly ash is available for use in concrete. High-volume fly ash is one of the major developments in the area of fly ash use. Ways that the cement and concrete industry can contribute toward reducing carbon dioxide emissions and the methods where high-range water-reducing admixtures can be used to reduce cement content proportioning are also described.

The article introduces products of interest to the concrete construction industry and for end users of concrete. The Conquest concrete imaging system from Sensors & Software Inc. locates reinforcing steel, embedded conduits and post-tensioning cables in concrete surfaces. The EUCO QWIKjoint from Euclid Chemical Co. is a polyurea floor joint filler with a fast cure time and long shave window.

Examines the usefulness of metakaolin as an addition to the sawdust-ash concrete. Function of metakaolin in improving concrete quality and by enhancing strength and reducing setting time; Detection of the decline in the workability of concrete as the percentage of sawdust ash replacement increased; Discovery of the ability of metakaolin in increasing the early strength of the concrete due to the slow process of hydration when sawdust ash alone was incorporated.

The article announces several personnel changes including promotion of Dan Bentz to Vice President of Sales and Marketing, in CHRYSO Inc.; promotion of promoted Erik Varnadoe to Vice President of Precast Operations in Spancrete; and appointment of Melissa Frierson Sales Representative in PROSOCO.

A letter to the editor is presented in response to the article "Complex Admixture Combinations," by Hugh Wang and colleagues in the January 2009, vol. 31, No. 1 issue.

The article features Durapoz F from Ash Grove Cement Co. which is designed to enhance reactivity and overcome setting time and strength issues of concretes in the U.S. The Durapoz is an enhancement of the Class F fly ash product and used by construction authorities as a replacement for cement to test aggregate reactivity. Moreover, it is also used to test for concrete permeability and Ash Grove Technical center shows that concrete mixtures produced using Durapoz has very good test values.

The article offers information on the Thirteenth International Conference on Superplasticizers and Other Chemical Admixtures in Concrete that will take place on November 1-3, 2021 in Milan, Italy.

The article focuses on the measurement of minimum air contents for concrete to resist damage from freezing and thawing. It states that for an air-entrained concrete, air content measurements are specified in the mixture design submittal, and air content is measured in the field to ensure compliance. However, air content measurements are generally not specified for non-air-entrained concrete.

Copyright of Concrete International is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article evaluates the various products including the concrete additives from Master Builders Solutions; HYDRAPEL Mortar Admixture from Euclid; QC-Pak from fritzpak;.

The article presents abstracts of several article including the "Chemical Admixtures for Concrete (ACI 212.3R-16)", "Specifications for Structural Concrete (ACI 301-16)", and "Guide to Portland Cement-Based Plaster (ACI 524R-16)".

The article evaluates several concrete products including the Kalmatron KF-A concrete admixture, the Krystol Repair Grout crystalline repair system from Kryton International Inc. and the Plasma crack-resistant tile from Laticrete.

An introduction to the periodical is presented in which the editor discusses on topics including concrete structures, visceral understandings of material, and workability of fresh concrete.

The article profiles four American Concrete Institute (ACI) Sustaining Members and provides a list of all Sustaining Member organizations as of December 2013. ACS Manufacturing Corporation is described as a market leader in manufacturing and supplying concrete admixtures in the Philippines. FIBERCON International is deemed a leading manufacturer of steel fiber reinforcement for the U.S. concrete industry. Headwaters Resources is said to be the U.S. leading marketer of coal combustion products.

Presents several abstracts on concrete design published in the November 2004 issue of the journal "Concrete International." "Report on Bridge Decks Free of Steel Reinforcement (ACI ITG 304); "Quality Management System for Concrete Construction (ACI-121R-04)"; "Guide for the Use of High-Range Water-Reducing Admixtures (Superplasticizers) in Concrete (ACI 212.4R-04)."

A calendar of events for the concrete industry in October 2009 is presented which includes the 51st Brazilian Concrete Congress, the 9th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete in Spain and the International Concrete Repair Institute 2009 Fall Convention in Arizona.

The article evaluates the Rheocolor® L liquid coloring admixtures from BASF Construction Chemicals.

The article evaluates the Davis Colors™ color admixtures from Davis Colors.

The article reports that Lafarge has secured two new contracts to market Class C fly ash from Oklaunion power stations in Vernon, Texas and American Electric Power's Welsh in Cason, Texas, expanding its product offerings. Lafarge also market fly ash to I-20 corridor between Shreveport, Louisiana and Odessa, Texas. The agreements will also position the company to better serve customers throughout the Dallas-Forth Worth area. The article also discusses the environmental benefits of using fly ash such as reduction in carbon footprint and embodied energy of concrete. It also states that fly ash is a by-product material from an industrial process that is recycled as a supplementary cementitious material in concrete.

The article evaluates the new Plastol 6000 polycarboxylate admixture from the Euclid Chemical Co.

The article evaluates ADVA® 405 and 408 water-reducing admixtures from Grace Construction Products.

The article evaluates Rheocolor® L liquid coloring admixtures from BASF Construction Chemicals.

The article evaluates Fritz-Pak Corp.'s concrete admixtures and additives.

The article evaluates the Supremes resistance concrete repair.