Details:

Creators:
Garana, Edward
Corporate Creators:
Texas. Highway Department
Subject/TRT Terms:
[+]
Carbonate Rocks Evaluation Hydrochloric Acid Leaching Limestone Aggregates Polishing (Aggregates) Skid Resistance Test Procedures Texture
Publication/ Report Number:
Research Report SS 11.7
Resource Type:
Tech Report
Geographical Coverage:
United States ; Texas
United States ; Texas Less -
Corporate Publisher:
Texas. Highway Department
Abstract:
In the past several years the National Crushed stone Association

has been conducting a research study into the skid resistance of carbonate

aggregate. The aim of the study has been the establishment of a relationship

between the skid resistance exhibited and the physical characteristics

of a carbonate aggregate.

The study conducted. at the National Crushed Stone Association's

laboratory was based on a concept that attributes the skid resistance of a

carbonate aggregate to the differential hardness of the minerals that

comprise the structure of the carbonate aggregate. According to this concept,

when a carbonate aggregate is subjected to a polishing action, the softer

minerals will wear away at a faster rate than the harder minerals. This

differential wearing away of the constituent minerals will leave the

Hearing surface of the aggregate with a rough, uneven texture which should

hopefully increase the skid resistance of the carbonate aggregate.

In order that the minerals could be examined and analyzed, a

method had to be developed which would separate the minerals from the matrix

"that held them together in the carbonate aggregate. The method would

have to act only on the cementing agent since it was imperative that the

minerals not be destroyed or altered in any manner.

Once the minerals were separated from the matrix of the carbonate

aggregate, t.hey could then be thoroughly examined and analyzed. The analysis

of the minerals involved a determination of the amount of carbonate present

in the total aggregate and a grain size distribution analysis of the constituent minerals. The minerals were also given a petrographical examination

to determine the mineral composition of the carbonate aggregate. To analyze

the contributions of the physical characteristics of the individual grains

to the over--all skid resistance of the aggregate, a microscopic examination

was made of the shape and surface texture of the mineral grains.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:657ececaa15cd88820a0d38683e26597f5342ae447be95d3c4b98b1490da45c1
Download URL:
https://rosap.ntl.bts.gov/view/dot/31459/dot_31459_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +