HISTORY
Commitment through the Years
From its humble beginnings as a sand and gravel producer in Austin, Texas, Capitol Aggregates has grown into a strong regional supplier of construction materials. With the capacity to produce a wide variety of aggregates and cement, Capitol Aggregates has truly been a Texas tradition since 1957.
Our Legacy
In 1963, H.B. Zachry purchased a former lithium plant and its surrounding land, spending less than two years converting it into a cement plant using limestone from the existing quarry. By 1965, Capitol’s cement plant was fully operational in San Antonio, with the capacity to produce one million barrels—approximately 188,000 tons—of cement annually. It was the least expensive “new” cement plant built in the United States at the time.
Capitol Executes a Long-Term Contract with Chemical Lime, LTD
Capitol executes a long-term contract with Chemical Lime, Ltd. to mine aggregate materials on its property in Marble Falls.
2004
Completion of the Marble Falls Quarry
The company’s expansion efforts continued with the completion of the Marble Falls Quarry and the launch of a new dredging operation at the Austin River Plant.
2007
Capitol Introduces Eco-Ment Endure®
2009
ECO-MENT ENDURE is the first blended cement marketed in Texas.
Capitol Introduces Eco-Ment Spec
ECO-MENT SPEC® was the first Portland Limestone Cement marketed in Texas.
2012
Expansion into South Texas
2014
Capitol Aggregates purchased 1,100 acres in New Braunfels, Texas, enabling the company to focus on its core South Texas markets. The company also completed the divestiture of its Marble Falls quarry, along with the supporting Seward Junction and Manor distribution terminals.
Capitol Cement Acquires the First Environmental Product Declaration
2015
Capitol Cement became the first in North America to acquire an Environmental Product Declaration (EPD) for cement.
2017
H.B. Zachry Company received a contract from the United States Air Force to rebuild runways at Bergstrom Air Force Base in Austin, Texas. Rather than purchase materials from another supplier, the company determined it would be more efficient to establish its own sand, gravel, and ready-mix operations. As a result, Zachry purchased Austin Sand and Gravel, which subsequently became Capitol Aggregates.
Perfect Safety Record
The cement operation received its first of 17 Portland Cement Association Safety trophies for a perfect safety record.
1968
1981
1983
Dry Kiln Addition
The cement plant's dry kiln addition becomes a reality when the first clinker is produced in December.
Capitol Purchases Delta Materials
1988
Capitol purchases Delta Materials which produces high-quality sandstone used to build safe, durable Texas highways.
Capitol Aggregates is incorporated on March 27, 1957
Capitol's Cement Plant goes online in San Antonio
Expansion in Georgetown
Construction began on a new crushed stone operation in Georgetown.
Zachry purchases Trans-Pecos Valley Southern Railroad/Hoban Plant
On February 28, 1968, Zachry Company interests incorporated Trans-Pecos Materials and the Pecos Valley Southern Railroad.
Henry Bartell Zachry passes
Henry Bartell Zachry, Jr., passed away on June 10, 2020. He believed in the goodness of people and considered it both a duty and a privilege to serve others—ranging from his family and employees to his fellow citizens.
2020
1957
1959
1965
Capitol begins dredging the Colorado River in Austin to increase the river's depth and width. The huge endeavor took 12 years to complete.
Capitol begins dredging the Colorado River
Rio Medina Plant
Capitol Aggregates built the Rio Medina Plant in 2017 and began operations for production and loadout in January 2018. This facility serves the west and north sides of San Antonio, supporting growth in new residential and business developments expanding westward.
New Finish Mill
A new finish mill was constructed at the cement plant increasing cement production and expanding the ability to create Eco-Ment® blended cement.
2022
Austin River Plant closes
The Austin River Plant closed in December 2022 after exhausting its sand and gravel reserves. It had been in operation for 15 years.