I-30 bridge

Dallas, Texas, May - June 2008
The IH-30 Bridge over Loop 12 west of Dallas, Texas contains approximately 1,000 cubic yards of TXI Hydromax internally cured concrete mix. In May and June of 2008, Austin Bridge and Road under the supervision of TxDOT Dallas District, pumped on three different occasions, a total of approximately 1,000 cubic yards of TXI’s internal curing concrete mix on the IH-30 bridge deck.

TXI Hydromax contains a medium gradation of ASTM C 330 rotary-kiln-produced expanded shale aggregate that replaces a portion of the coarse and fine aggregates in the concrete mix. Because of the well known properties of absorption, the expanded shale aggregate releases moisture back into the mix during the curing or setting period further enhancing the compressive strengths and durability of the concrete.

All the pours were started in the early morning hours before sunrise and finished by 8 AM or 9 AM.

The required flexural strength was obtained in 7 days.

TxDOT Lab compressive strengths for the trial mix design averaged 4,690 PSI in 7 days.

The required 4,000 PSI 28 day compressive strengths were met or surpassed by as much as 1,000 PSI in 7 days.

28 day strengths averaged over 6,000 PSI on one set of cylinders.

One cylinder broke over 7,000 PSI after 56 days.

Pour conditions at times experienced 25 mph to 35 mph winds on the elevated bridge deck. Ambient temperatures ranged from high 90’s to low 70’s that are typical of late spring and early summer for the North Texas Region. TXI’s Hydromax experienced very minimal cracking in the bridge deck pours observed both during and after pour events.

I-30 bridge

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