Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Water Reducing Admixtures in PCCP Mixes
The purpose of this investigation was to determine the potential benefits and cost savings of adding a Type A water reducer and lowering the cement content in MoDOT's PCCP mixes. As a result of adding a water reducer to PCC paving mixes, it is proposed that the cement content can be decreased along with a reduction of mixing water. It is also proposed that adding a water reducer will promote complete hydration of the cement particles resulting in an improved hardened concrete product in terms of strength, durability, and performance. This research investigation was a two-part study that included both laboratory and field results of PCCP mixes containing a Type A water reducer with cement reductions ('water reducer mixes') and standard PCCP mixes ('control mixes'). The concrete specimens fabricated in the laboratory and the field were tested to determine the following characteristics of the PCCP mixes: 7-day compressive strength (AASHTO T22); 28-day compressive strength (AASHTO T22); 7-day flexural strength (AASHTO T97 or T177); 28-day flexural strength (AASHTO T97 or T177); Freeze-thaw durability (AASHTO T161): Air void analysis (ASTM C457); and rapid chloride permeability (AASHTO T277). This report presents the findings from both the laboratory and field study by comparing concrete characteristics of PCCP mixes containing a Type A water reducer and reduced cement contents to a conventional mix.
Water Reducing Admixtures in PCCP Mixes
The purpose of this investigation was to determine the potential benefits and cost savings of adding a Type A water reducer and lowering the cement content in MoDOT's PCCP mixes. As a result of adding a water reducer to PCC paving mixes, it is proposed that the cement content can be decreased along with a reduction of mixing water. It is also proposed that adding a water reducer will promote complete hydration of the cement particles resulting in an improved hardened concrete product in terms of strength, durability, and performance. This research investigation was a two-part study that included both laboratory and field results of PCCP mixes containing a Type A water reducer with cement reductions ('water reducer mixes') and standard PCCP mixes ('control mixes'). The concrete specimens fabricated in the laboratory and the field were tested to determine the following characteristics of the PCCP mixes: 7-day compressive strength (AASHTO T22); 28-day compressive strength (AASHTO T22); 7-day flexural strength (AASHTO T97 or T177); 28-day flexural strength (AASHTO T97 or T177); Freeze-thaw durability (AASHTO T161): Air void analysis (ASTM C457); and rapid chloride permeability (AASHTO T277). This report presents the findings from both the laboratory and field study by comparing concrete characteristics of PCCP mixes containing a Type A water reducer and reduced cement contents to a conventional mix.
Water Reducing Admixtures in PCCP Mixes
J. M. Blomberg (Autor:in)
2001
91 pages
Report
Keine Angabe
Englisch
Water-reducing admixtures for concrete
| Engineering Index Backfile | 1963
| British Library Conference Proceedings | 2005
| Online Contents | 1998
Material Selections Guide: Water-reducing Admixtures
Online Contents | 2006