Hydraulic Cement Grout Testing, MLR-89-14, 1990

Currently, hydraulic cement grouts are approved for Iowa Department of Transportation projects on the basis of a pullout test. However, other properties of the grouts should be evaluated. Therefore, this research was initiated to develop criteria to better evaluate hydraulic cement grouts. Fourteen grouts were tested for compressive strength, time of set, durability, consistency and shrinkage. Tested grouts all yielded compressive strengths higher than 3000 psi at 7 days and durability factors were well above 70. Time of set and consistency was adequate. The testing showed most grouts tested shrank, even though tested grouts were labeled non-shrink grouts. For many applications of grouts such as setting in anchor bolts and as a filler, minor shrinkage is not a problem. However, for some critical applications, shrinkage cannot be tolerated. The proposed Instructional Memorandum will identify those grouts which do not excessively shrink or expand in the tests used. Based on test results, criteria for evaluation of hydraulic cement grouts have been recommended. Evaluation consists of tests for compressive strength, time of set, durability, consistency, shrinkage and pullout test.

Floods of June 17, 1990 and July 9, 1993, Along Squaw Creek and the South Skunk River in Ames, Iowa, and Vicinity, HR-140, 1996

Water-surface-elevation profiles and peak discharges for the floods of June 17, 1990, and July 9, 1993, along Squaw Creek and the South Skunk River, in Ames, Iowa, are presented in this report. The maximum flood-peak discharge of 24,300 cubic feet per second for the streamflow-gaging station on Squaw Creek at Ames, Iowa (station number 05470500) occurred on July 9, 1993. This discharge was 80 percent larger than the 100-year recurrence-interval discharge and exceeded the previous record flood-peak discharge of June 17, 1990, by 94 percent. The July 9, 1993, flood-peak discharge of 26,500 cubic feet per second on the South Skunk River below Squaw Creek (station number 05471000) was also a peak of record, exceeding the previous record flood-peak discharge of June 27,1975, by 80 percent, and the 100-year recurrence-interval discharge by 60 percent. A flood history describes rainfall conditions for floods that occurred during 1990 and 1993.

Similituds i diferències entre l'actual crisi financera i la japonesa de 1990

L'estudi de la reacció d'una societat després de l'esclat d'una bombolla financera és l'aspecte que motiva l'inici d'aquesta recerca. En l'actualitat l'estat espanyol es troba immers en una situació financera compromesa, però aquesta situació és comparable amb altres economies. L'objectiu principal d'aquesta recerca és la comparació de l'experiència japonesa amb l'actual crisi del sistema financer espanyol.

Summary of Legislation: Iowa General Assembly, 1990

This summary of legislation enacted by the General Assembly has been prepared for the use of legislators and other interested parties. The summary of each legislative enactment has been assigned to a major subject category. This compilation provides interested persons with quick reference to legislation enacted in specific areas and generally informs persons of the contents and effective date of the legislation. NOTE: This is a large file and may take a few minutes to load.

Análisis de convergencia de las regiones de la zona euro (1990-2010)

Since the birth of Economic and Monetary Union (EMU), policies have been implemented in the Member States of the European Union (EU) to lead them towards economic convergence. This article analyses the convergence of the 174 regions that exist in the 17 euro-zone countries in the years from 1990 to 2010. The article specifies a space-time econometric model using the hypotheses of conditioned beta-convergence and sigmaconvergence. The dependent variables of the model are per capita GDP and productivity and the explanatory variables are real economic variables. Beta-convergence is found to exist between the countries of the euro-zone in terms of per capita GDP, but there is divergence in terms of productivity, though only at country level. In other words, the hypothesis is confirmed that it is guidelines at country level that lead to hypothetical convergence and that the unfavourable performance of productivity is due, without doubt, to differences in behaviour between the active populations of the different euro zone countries

Constructability in the Bridge Design Process, Progress Report, HR-320, 1990

Information concerning standard design practices and details for the Iowa Department of Transportation (IDOT) was provided to the research team. This was reviewed in detail so that the researchers would be familiar with the terminology and standard construction details. A comprehensive literature review was completed to gather information concerning constructability concepts applicable to bridges. It was determined that most of the literature deals with constructability as a general topic with only a limited amount of literature with specific concepts for bridge design and construction. Literature was also examined concerning the development of appropriate microcomputer databases. These activities represent completion of Task 1 as identified in the study.