Report Recycled Content Plastic Bag and Soy Inks, Iowa Department of Transportation, 2003

Report to Margaret Thompson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Report Recycled Content Plastic Bag and Soy Inks, Iowa Department of Transportation, 2002

Report to Margaret Thompson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Recycled Content Plastic Bag and Soy Inks Report, 2004

Report to Margaret Thompson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Recycled Content Plastic Bag and Soy Inks Report, 2005

Report to Margaret Thomson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Recycled Content Plastic Bag and Soy Inks Report, FY 2006

Report to Margaret Thomson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Improving Transition Outcomes: Resource Mapping Workshop: Content Outline

Content outline used during the Improving Transition Outcomes Resource Mapping Workshops

FY 07 Recycled Content Plastic Bag and Soy Inks Report

As required in Iowa Code section 307.21, this is a summary of purchasing activity for soy-based inks and recycled content trash bags. The figures are for fiscal year 2007.

FY 08 Recycled Content Plastic Bags and Soy Inks Report

As required in Iowa Code section 307.21, the Iowa Department of Transportation submits the following summary of purchasing activity for soy based inks and recycled trash bags. The figures are for Fiscal Year 2008.

FY 09 Recycle Content Plastic Bag and Soy Inks Report

As required by Iowa Code section 307.21, figures for Fiscal Year 2009 for purchasing activity for soy-based inks and recycled content trash bags.

FY10 Recycled Content Plastic Bag and Soy Inks Report

As required by Iowa Code section 37.21, the following is a summary of purchasing activities for soy-based inks and recycled content plastic trash bags. The figures are for Fiscal Year 2010. The department currently has no equipment which will operate with soy ink. Iowa Code section 8A.315 required that a minimum of 50 percent of garbage can liner purchases shall be recycled content plastic garbage can liners. The department purchased $51.478.04 worth of recycled content plastic garbage can liners. The represents 93.9 percent of garbage can liners purchased.

FY 11 Recycled Content Plastic Bag and Soy Inks Report, January 30, 2012

As required by Iowa Code section 307.21, the following report was submitted related to the purchase of soy based inks and recycled content trash bags.

Optimizing Cementious Content in Concrete Mixtures for Required Performance Final Report, January 2012

This research investigated the effects of changing the cementitious content required at a given water-to-cement ratio (w/c) on workability, strength, and durability of a concrete mixture. An experimental program was conducted in which 64 concrete mixtures with w/c ranging between 0.35 and 0.50, cementitious content ranging from 400 to 700 per cubic yard (pcy), and containing four different supplementary cementitious material (SCM) combinations were tested. The fine-aggregate to total-aggregate ratio was fixed at 0.42 and the void content of combined aggregates was held constant for all the mixtures. Fresh (i.e., slump, unit weight, air content, and setting time) and hardened properties (i.e., compressive strength, chloride penetrability, and air permeability) were determined. The hypothesis behind this study is that when other parameters are kept constant, concrete properties such as strength, chloride penetration, and air permeability will not be improved significantly by increasing the cement after a minimum cement content is used. The study found that about 1.5 times more paste is required than voids between the aggregates to obtain a minimum workability. Below this value, water-reducing admixtures are of no benefit. Increasing paste thereafter increased workability. In addition, for a given w/c, increasing cementitious content does not significantly improve compressive strength once the critical minimum has been provided. The critical value is about twice the voids content of the aggregate system. Finally, for a given w/c, increasing paste content increases chloride penetrability and air permeability.

Optimizing Cementitious Content in Concrete Mixtures for Required Performance Final Report, January 2012

This research investigated the effects of changing the cementitious content required at a given water-to-cement ratio (w/c) on workability, strength, and durability of a concrete mixture. An experimental program was conducted in which 64 concrete mixtures with w/c ranging between 0.35 and 0.50, cementitious content ranging from 400 to 700 per cubic yard (pcy), and containing four different supplementary cementitious material (SCM) combinations were tested. The fine-aggregate to total-aggregate ratio was fixed at 0.42 and the void content of combined aggregates was held constant for all the mixtures. Fresh (i.e., slump, unit weight, air content, and setting time) and hardened properties (i.e., compressive strength, chloride penetrability, and air permeability) were determined. The hypothesis behind this study is that when other parameters are kept constant, concrete properties such as strength, chloride penetration, and air permeability will not be improved significantly by increasing the cement after a minimum cement content is used. The study found that about 1.5 times more paste is required than voids between the aggregates to obtain a minimum workability. Below this value, water-reducing admixtures are of no benefit. Increasing paste thereafter increased workability. In addition, for a given w/c, increasing cementitious content does not significantly improve compressive strength once the critical minimum has been provided. The critical value is about twice the voids content of the aggregate system. Finally, for a given w/c, increasing paste content increases chloride penetrability and air permeability.

FY12 Recycled Content Plastic Bag and Soy Inks report

This report summarizes the purchasing activity for soy based inks and recycled content trash bags for the Iowa DOT.

Determination of Asphalt Content and Characteristics of Bituminous Paving Mixtures, MLR-88-11, 1988

Due to the hazardous nature of chemical asphalt extraction agents, nuclear gauges have become an increasingly popular method of determining the asphalt content of a bituminous mix. This report details the results of comparisons made between intended, tank stick, extracted, and nuclear asphalt content determinations. A total of 315 sets of comparisons were made on samples that represented 110 individual mix designs and 99 paving projects. All samples were taken from 1987 construction projects. In addition to the comparisons made, seventeen asphalt cement samples were recovered for determination of penetration and viscosity. Results were compared to similar tests performed on the asphalt assurance samples in an attempt to determine the amount of asphalt hardening that can be expected due to the hot mix process. Conclusions of the report are: 1. Compared to the reflux extraction procedure, nuclear asphalt content gauges determine asphalt content of bituminous mixes with much greater accuracy and comparable precision. 2. As a means for determining asphalt content, the nuclear procedure should be used as an alternate to chemical extractions whenever possible. 3. Based on penetration and viscosity results, softer grade asphalts undergo a greater degree 'of hardening due to hot mix processing than do harder grades, and asphalt viscosity changes caused by the mixing process are subject to much more variability than are changes in penetration. 4. Based on changes in penetration and viscosity, the Thin Film Oven Test provides a reasonable means of estimating how much asphalt hardening can be anticipated due to exposure to the hot mix processing environment.