On the Aggregate Effects of Individual Risks

1992 ◽  
Keyword(s):  
Aggregate Effects

Coarse Aggregate Effects on Elastic Moduli of Concrete

1996 ◽  
Vol 1547 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Bouzid Choubane ◽  
Chung-Lung Wu ◽  
Mang Tia
Keyword(s):  
Elastic Modulus ◽  
Dynamic Modulus ◽  
Laboratory Testing ◽  
Elastic Moduli ◽  
Coarse Aggregate ◽  
Textured Surface ◽  
Test Program ◽  
Static Modulus ◽  
Aggregate Effects ◽  
Strength And Stiffness

The results of a laboratory testing program carried out to investigate the effect of coarse aggregate types on the elastic modulus of typical pavement concretes are presented. The elastic modulus was determined in both flexure and compression using static and dynamic means. Three different mixes, made using three different aggregates, were compared. The water-cement ratio was kept at 0.53 throughout the test program. The results showed that within the tested range, the aggregate type significantly affected the studied properties of concrete. Calera aggregate (a dense limestone) with its rough-textured surface and angular shape produced a concrete with higher strength and stiffness than those of concretes made with Brooksville aggregate (a porous limestone) and river gravel. In addition, the measured dynamic modulus in compression was significantly different from that in flexure. Also, in flexure, the dynamic modulus was higher than the static modulus by an average of 23 percent, whereas in compression, the dynamic modulus appeared to be in the same range as the static modulus. The change in frequency from 1 to 7 Hz did not have a significant influence on the dynamic modulus.

Aggregate effects and measuring regional dynamics

2019 ◽  
Vol 98 (5) ◽  
pp. 1955-1991 ◽  
Author(s):  
Ryan Greenaway‐McGrevy ◽  
Kyle Hood
Keyword(s):  
Regional Dynamics ◽  
Aggregate Effects

The Effects of Local Economic Conditions on Confidence in Key Institutions and Interpersonal Trust after the Great Recession

2013 ◽  
Vol 650 (1) ◽  
pp. 274-298 ◽  
Author(s):  
Lindsay A. Owens ◽  
Karen S. Cook
Keyword(s):  
Great Recession ◽  
Political Attitudes ◽  
Interpersonal Trust ◽  
Social Institutions ◽  
Organized Labor ◽  
Economic Conditions ◽  
County Level ◽  
The Great Recession ◽  
Data Source ◽  
Aggregate Effects

The effects of recessions on social and political attitudes are likely smaller than the effects on employment, income, and wealth, but relatively modest aggregate effects may be masking differences in attitudes between individuals who live in areas most and least affected by recessions. To investigate social and political attitudes in geographical context, we exploit a new data source that matches individuals to their county of residence to analyze whether changing economic conditions at the county level are associated with changing confidence in major social institutions and with changing levels of interpersonal trust. We find that individuals in particularly affected counties are more likely to decrease their support for organized labor and the federal government. County-level hardship does not appear to be associated with changes in interpersonal measures of trust, however, suggesting that two very different processes may be at play.

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