Influence of using slag cement on the microstructure and durability related properties of cement grouts for micropiles

Today, the use of micropiles for different applications has become very common. In Spain, the cement grouts for micropiles are prepared using ordinary Portland cement and w:c ratio 0.5, although the micropiles standards do not restrict the cement type to use, provided that it reaches a certain compressive strength. In this study, the influence of using slag cement on the microstructure and durability related properties of cement grouts for micropiles have been studied until 90 hardening days, compared to an ordinary Portland cement. Finally, slag cement grouts showed good service properties, better than ordinary Portland cement ones.

Impedance spectroscopy study of the effect of environmental conditions in the microstructure development of OPC and slag cement mortars

In this work, the microstructure of mortars made with an ordinary Portland cement and slag cement has been studied. These mortars were exposed to four different constant temperature and relative humidity environments during a 180-day period. The microstructure has been studied using impedance spectroscopy, and mercury intrusion porosimetry as a contrast technique. The impedance spectroscopy parameters make it possible to analyze the evolution of the solid fraction formation for the studied mortars and their results are confirmed with those obtained using mercury intrusion porosimetry. The development of the pore network of mortars is affected by the environment. However, slag cement mortars are more influenced by temperature while the relative humidity has a greater influence on the OPC mortars. The results show that slag cement mortars hardened under non-optimal environments have a more refined microstructure than OPC mortars for the studied environmental conditions.

Pittsburgh, Pennsylvania, ca. 1879 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Map of Pittsburgh : showing the location of its furnaces, rolling mills & steel works. It was published by Chilton Co., etc., ca. 1879. Scale [ca.1:33,800]. Covers a portion of Pittsburgh, Pennsylvania. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Pennsylvania South State Plane NAD 1983 coordinate system (in Feet) (Fipszone 3702). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as roads, railroads and stations, drainage, selected buildings, and more. Includes inset map covering Pittsburgh area as far as McKeesport. Below map: List of Blast Furnaces -- List of Rolling Mills -- List of Steel Works. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection as part of the Imaging the Urban Environment project. Maps selected for this project represent major urban areas and cities of the world, at various time periods. These maps typically portray both natural and manmade features at a large scale. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.

Shock tube studies of the effects of sharp-rising, long-duration overpressures on biological systems /

Shock tubes have been used successfully by a number of investigators to study the biological effects of variations in environmental pressures (1,2,3). Recently an unusually versatile laboratory pressurization source became available with the capability of consistently reproducing a wide variety of pressure-time phenomena of durations equal to and well beyond those associated with the detonation of nuclear devices (4). Thus it became possible to supplement costly full-scale field research in blast biology carried out at the Nevada Test Site (5,6) by using an economical yet realistic laboratory tool. In one exploratory study employing pressure pulses of 5 to 10 sec duration wherein the times to max overpressure and the magnitudes of the overpressures were varied, a relatively high tolerance of biological media to pressures well over 150 psi was demonstrated (7). In contrast, the present paper will describe the relatively high biological susceptibility to long duration overpressures in which the pressure rises occurred in single and double fast-rising steps.

Base surge analysis /

"September 1, 1963"--Title page.

Earth deformation from a nuclear detonation in salt : final report /

"U.S. Atomic Energy Commission. Plowshare Program"--Cover.

Earth deformation from a nuclear detonation in salt : preliminary report /

"Preliminary report"--Cover.

Particle motion near a nuclear detonation in halite : final report/

"Issued: September 5, 1963"--Cover ; "February 1963"--Title page.

Particle motion near a nuclear detonation in halite : preliminary report /

"U.S. Atomic Energy Commission, Plowshare Program ; Project Gnome, Carlsbad, New Mexico, December 10, 1961"--Cover.

46th Shock and Vibration Symposium, Royal Inn at the Wharf, San Diego, California, 21-23 October 1975 /

Called Symposium on Shock and Vibration in vols. 2-5.

The English scholar's library of old and modern works /

Description based on: no. 1

The interaction of non-nuclear munitions with structures : symposium proceedings, U.S. Air Force Academy, Colorado, May 10-13, 1983 /

Mode of access: Internet.

Certain tractates; together with the book of four score three questions, & a translation of Vincentius Lirinensis;

V.1. Introduction: Life of Winzet. List of Winzet's works, biographies, mss. [etc.] Appendix to Introduction.- Certane tractatis for reformation of doctryne and maneris set furth at the desyre and in the name of the afflictit Catholikis, in Scotland. 1562. The last blast of the trompet of Godis vvorde aganis the vsurpit auctoritie of Iohne Knox and his Caluiniane brether intrudit Precheouris &c. 1562. The buke of four scoir thre questions, tueching doctrine, ordour, and maneris, proponit to the precheouris of the Protestants in Scotland ... 1563. An exhortation to mature and godly deliberation in the premisses. To John Knox, written 27 oct. 1563. -- v. 2. Introduction. Vincentivs Lirinensis ... for the antiquitie and veritie of the Catholik fayth ... tr. in Scottis.

Poketown people, or, parables in black /

Advertisements on p. 4 at front and p. [2]-[12] at end.

The works of John Knox /

Includes indexes.