问题描述：
英语翻译
Guthrie,Young,Blankenagel,and Cooley 2
INTRODUCTION
Cement-stabilized roadbed materials have been successfully used in pavements for over 85 years
(1).In particular,cement is increasingly used in conjunction with full-depth recycling (FDR),
where the cement-treated base (CTB) is constructed using reclaimed material from a deteriorated
asphalt pavement.The addition of Portland cement to the pulverized reclaimed asphalt
pavement (RAP) and aggregate base material increases the strength and stiffness of the base
layer,improving its bridging capacity over lower layers (2).This process thus creates a very
attractive cement-based product when considering economic,environmental,and engineering
perspectives.
In order to avoid early-age damage to CTB materials,the cement must be allowed to cure
for a period of time before the pavement can be opened to traffic.Trafficking of a cement-
treated material before sufficient strength gain has occurred can lead to marring and permanent
deformation of the layer.For this reason,many transportation agencies require a 7-day curing
period before a cement-treated layer may be opened to traffic (3).While this conservative
approach avoids damage to the newly constructed CTB,it can delay construction,increase
construction costs,and cause greater inconvenience to the traveling public.Consequently,a
reliable method is needed for determining when a newly constructed cement-treated roadway has
achieved sufficient strength to prevent damage under early trafficking.
The purpose of this research was therefore to evaluate the utility of selected equipment
available to pavement engineers and contractors for assessing susceptibility to bearing-capacity
failure or excessive permanent deformation in cement-stabilized materials under traffic loading.
In particular,the utility of individual devices for monitoring the strength gain of cement-
stabilized materials immediately following construction was investigated.
This paper describes four types of equipment that have the potential for evaluating the in-
situ strength or stiffness of cement-treated materials and provides details of the laboratory and
field testing conducted in connection with a pavement reconstruction project along Interstate 84
(I-84) in Morgan,Utah.The results are then discussed together with statistical techniques used
to quantify the repeatability and the sensitivity of the SSG and CIST data to CTB curing time.
The conclusion summarizes the research findings and offers recommendations for future work
Guthrie,Young,Blankenagel,and Cooley 2
INTRODUCTION
Cement-stabilized roadbed materials have been successfully used in pavements for over 85 years
(1).In particular,cement is increasingly used in conjunction with full-depth recycling (FDR),
where the cement-treated base (CTB) is constructed using reclaimed material from a deteriorated
asphalt pavement.The addition of Portland cement to the pulverized reclaimed asphalt
pavement (RAP) and aggregate base material increases the strength and stiffness of the base
layer,improving its bridging capacity over lower layers (2).This process thus creates a very
attractive cement-based product when considering economic,environmental,and engineering
perspectives.
In order to avoid early-age damage to CTB materials,the cement must be allowed to cure
for a period of time before the pavement can be opened to traffic.Trafficking of a cement-
treated material before sufficient strength gain has occurred can lead to marring and permanent
deformation of the layer.For this reason,many transportation agencies require a 7-day curing
period before a cement-treated layer may be opened to traffic (3).While this conservative
approach avoids damage to the newly constructed CTB,it can delay construction,increase
construction costs,and cause greater inconvenience to the traveling public.Consequently,a
reliable method is needed for determining when a newly constructed cement-treated roadway has
achieved sufficient strength to prevent damage under early trafficking.
The purpose of this research was therefore to evaluate the utility of selected equipment
available to pavement engineers and contractors for assessing susceptibility to bearing-capacity
failure or excessive permanent deformation in cement-stabilized materials under traffic loading.
In particular,the utility of individual devices for monitoring the strength gain of cement-
stabilized materials immediately following construction was investigated.
This paper describes four types of equipment that have the potential for evaluating the in-
situ strength or stiffness of cement-treated materials and provides details of the laboratory and
field testing conducted in connection with a pavement reconstruction project along Interstate 84
(I-84) in Morgan,Utah.The results are then discussed together with statistical techniques used
to quantify the repeatability and the sensitivity of the SSG and CIST data to CTB curing time.
The conclusion summarizes the research findings and offers recommendations for future work
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