Written in EnglishRead online
|Statement||interim report by T. D. Larson [and others.|
|Series||National Cooperative Highway Research Program. Report, 15, NAS-NRC publication 1214., Report (National Cooperative Highway Research Program) ;, 15., Publication (National Research Council (U.S.)) ;, 1214.|
|Contributions||National Research Council (U.S.). Highway Research Board.|
|LC Classifications||TE7 .N25 no. 15|
|The Physical Object|
|Number of Pages||66|
|LC Control Number||65060085|
Download Identification of concrete aggregates exhibiting frost susceptibility
Get this from a library. Identification of concrete aggregates exhibiting frost susceptibility. [Thomas D Larson; National Research Council (U.S.). Highway Research Board.] -- A search was made for a test or tests that would rapidly and reliably identify aggregate particles subject to destructive volume change when frozen in concrete.
The test methods investigated were 1. four test methods for identifying aggregates susceptible to damage from cycles of freezing and thawing. These were (a) the Powers slow freeze-thaw of concrete specimens, (b) aggregate pore system studies, (c) aggregate particle expansion studies, and (d) petrographic examination.
Aggregates of known frost resistance. This study deals with reliable identification of frost susceptibility of recycled concrete aggregates. An unbound frost durability test with a mild pre-drying procedure (at 50 °C) was performed on recycled concrete aggregates originated from both air-entrained and non-air-entrained type of source by: Recommended Citation Salcedo, M.
Identification of Frost Susceptible Aggregate and Their Use in Concrete or Bituminous ation FHWA/IN/JHRP/ Joint Highway Research Project, Indiana Department of Transportation and Purdue University, West Lafayette, Indiana, Cited by: 5.
This study deals with reliable identification of frost susceptibility of recycled concrete aggregates. An unbound frost durability test with a mild pre-drying procedure (at 50°C) was performed on. Concrete on the basis of crushed brick aggregate has satisfactory compressive and tensile strength and thermal insulating properties but shows weaker resistance to water and frost action and has greater shrinkage by % than ordinary concrete [1,6,7,8,14,15].
thawing. Concrete with sand lime brick aggregates was found to have better frost resistance compared to concrete with gravel aggregate with negligible loss in dynamic modulus in spite of some expansion. The behavior of concrete with engineering brick aggregates was found to be almost similar to gravel concrete control.
Figure 1. Norwegian frost susceptibility criteria. In roadway aggregates, frost-susceptibility criteria based on the grain size need to be evaluated with respect to the stability of compacted material and associated raveling and dusting potential.
Current state of the practice for maintaining and upgrading unpaved aggregate roads. This is illustrated by the results obtained beneath a concrete pavement (Fig.
Even when the material in the upper part of the road is susceptible to frost heave, the rapid movement of the zero isotherm is unlikely to permit any significant upwa d movement of water. Identification of Frost-Susceptible Soils. Frost-susceptible soils have been classified into four general groups.
Table provides a summary of the typical soils in each of these four groups based on the amount of fines (material passing the mm (No.
) sieve. Coarse aggregates (Fig. ) consist of one or a com-CHAPTER 5 Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm ( in.) and generally between mm and mm (3⁄ 8 in.
and 11⁄ 2 in.). Some natural aggregate deposits, called. Identification of frost-susceptible aggregates Published in Durability of concrete and cement composites A key step in designing durable concrete in cold weather applications is to identify whether an aggregate of interest may be susceptible to frost damage, which may manifest itself as internal distress within concrete or surface damage, such as D-cracking (especially for pavements) and pop.
The frost susceptibility of aggregates was examined by the developed frost heave test arrangements. In certain crushed rock aggregate the frost susceptibility at under 15 % fines content was found to be directly proportional to the fines content of the material.
Correla- tion of the test data with a measure of frost susceptibility (average dilation per cycle in the slow-cooling test) revealed that vacuum saturated absorption values of less than 1 percent indicate highly durable aggregates; values greater than 5 percent indicate highly susceptible Size: 6MB.
Get this from a library. Identification of frost-susceptible particles in concrete aggregates. [Thomas D Larson; P D Cady; Pennsylvania State University.] -- Aggregate test methods to identify frost-susceptible particles in concrete aggregates are evaluated.
Two approaches to the problem of identifying frost-susceptible aggregate particles were followed. Limestone was classed as not frost susceptible, whereas demolition debris needed further testing at other laboratories to confirm its frost susceptibility.
Although the frost heave of crushed concrete appeared to be directly influenced by the initial moisture content of the specimens, the increase in volume of the material due to the expansion of this water on freezing was found to be relatively insignificant.
Frost susceptibility of concrete in near-saturated states Kian Sin Soo Iowa State University Follow this and additional works at: Part of theCivil Engineering Commons This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University.
Damaging Formula of the Frost Resistant Concrete with Poor Quality of Coarse Limestone Aggregate the concrete damaging is explained. Poor quality of limestone is described with sufficiently low percent of lime (CaO), high content of magnesium oxide (MgO) and aluminium oxide (Al2O3) with a considerably high percent of water absorption.
ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL. The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete by: 6.
These laboratory test methods cover the frost heave and thaw weakening susceptibilities of soil that is tested in the laboratory by comparing the heave rate and thawed bearing ratio 2 with values in an established classification system.
This test was developed to classify the frost susceptibility of soils used in pavements. It should be used for soils where frost-susceptibility.
ping projects, the kinetics of cement hydration, the identification of concrete aggregates exhibiting frost susceptibility, and teaching in a tough, three-term course in mineralogy and crystal chemistry.
Book Description. The EURO-C conference series (SplitZell am SeeInnsbruckBadgasteinSt. Johann im PongauMayrhofenSchladmingSt. Anton am Arlbergand Bad Hofgastein ) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete.
Petrographic tests. Petrographic testing is the use of microscopes to examine samples of rock or concrete to determine their mineralogical and chemical characteristics. Samples for petrographic examination can be taken from lump samples or cores.
They are impregnated with resin. Further steps appear to be needed to make cryogenic concrete, and these steps will also be discussed in the paper. Air entrainment is not necessary. Cube samples of 10 cm side of cryogenic concrete, made according to the formula, suffered no frost damage under Cited by: 3.
This paper presents recent study on the moisture susceptibility of asphalt mixtures under various water and frost conditioning. Moisture susceptibility of asphalt mixture is a very important property influencing significantly pavement durability.
In particular, asphalt layers are subjected to a deterioration factor which is traffic independent Author: Maciej Maliszewski, Adam Zofka, Dominika Maliszewska, Dariusz Sybilski. susceptibility of concrete to frost gelivite du beton. the investigation will deal with the following: comparison of overall test results obtained with old and new equipment; - frost behaviour of preheated concrete; - influence of the dimension of samples; - study of new categories of cement; - behaviour of lightweight aggregate concrete.
Frost-susceptibility is related to size distribution of soil particles. In general, coarse-grained soils such as sands and gravels do not heave, whereas clays, silts and very fine sands will support the growth of ice lenses even when present in small proportions in coarse soils.
Frost susceptible borrow materials cannot be used in the design. If the subgrade is frost susceptible, determine the frost group and soil support index from Tables and STEP 4.
The EURO-C conference series (SplitZell am SeeInnsbruckBadgasteinSt. Johann im PongauMayrhofenSchladmingSt. Anton am Arlbergand Bad Hofgastein ) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete and concrete Cited by: 1.
The ability of aggregate to withstand the stresses induced during the mixing of HCC is very important and, therefore, aggregates must be able to conform to the abrasion resistance requirements specified in ASTM C 33 (specification for concrete aggregates) as tested in accordance with ASTM C (resistance to degradation of small-size coarse.
Note. FROST – Frost Protection of Roads and Railways. “Frost Protection of Roads and Railways” is an international research project, Frost susceptibility of construction materials. Laboratory frost heave tests are the most reliable method for assessment of frostFile Size: KB.
Frost resistant concrete Page 2 av 6 - higher temperature of the ready mixed concrete (i.e. warm concrete), by heating the aggregates, by hot water, by steam in the mixer etc.
It should be used for soils where frost-susceptibility considerations, based on particle size such as the limit of 3 % finer than 20 mm in Specification Dare uncertain.
This is most important for frost-susceptibility criteria such as those used by the Corps of Engineers, that require a freezing test for aggregates of inconclusive frost. Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors.
The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. Corrosion of reinforcing steel is the most common cause of concrete.
Foundation Damage Due to Composition or Inclusions Foundation Cracks, Spalling, Stains caused by composition, inclusions, steel, rust. Defects in concrete mix (too much water, for example), or defects in placement of steel or iron reinforcement (too close to surface, for example), as well as use of problem materials in concrete such as high levels of cinders, coal ash, or Iron sulfide mineral.
Frost Resistance of Concrete (Rilem Proceedings) 1st Edition by R Auberg (Author), M.J. Setzer (Author) ISBN Format: Hardcover. Properties of recycled aggregates used in unbound base and subbase pavement layers that affect pavement per- formance include shear strength, stiffness, toughness, dura- bility, frost susceptibility.
Test Methods. Crushing value of aggregates was determined according to JTG E .Compressive strength of concrete was tested on mm cubes in accordance with JTG E .Water absorption of concrete was measured on mm cubes in compliance with ASTM C .Frost durability of concrete was tested on × × mm prisms following “the rapid FT Cited by: 1.
Washington, DC: The National Academies Press. doi: / Recycled Concrete aggregate Kuo et al. () investigated the feasibility of using RCA as a base course material in asphalt pavements.
Properties that influenced the per- formance of RCA base materials for pavements included aggregate toughness, frost susceptibility. FROST-INDUCED DETERIORATION OF CONCRETE IN HYDRAULIC STRUCTURES 3 Foreword Hydropower concrete constructions in Sweden have a high average age, some power stations have even passed their th anniversary.
An efficient asset management is required to keep the constructions safe and ensure a long service life. Geotechnical materials for the career development, information, and resources for Geotechnical Engineers. Geotechnical materials resources for download includes geotechnical software, geotechnical publications, geotechnical technical guidance, soils, concrete, engineering materials, structural fill, asphalt, quality control, quality assurance, QC, QA, geotechnical inspection, backfill, USACE.Research Article Frost Durability and Strength of Concrete Prepared with Crushed Sand of Different Characteristics Ming-kaiZhou, 1 Zhan-aoLiu, 1,2 andXiaoChen 1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, ChinaCited by: 1.Introduction.
Streptococcus suis, a Gram-positive encapsulated coccus, is considered to be an important swine pathogen, which not only causes septicemia but also affects the central nervous system (CNS) and other tissues, leading to meningitis, endocarditis, pneumonia and arthritis.Although 33 serotypes have been recognized on the basis of capsular antigens, serotype 2 is still the most Cited by: 9.