2014 English Special Provisions to Item 421 - HYDRAULIC CEMENT CONCRETE (All)
| SP421-010 | RTF | - changes mix design allowances for Class H concrete and requirements for calcium nitrite corrosion inhibitors. Required for all projects using Hydraulic Cement Concrete beginning with the July 2022 letting. Use of this special provision prior to the July 2022 letting is at the District's option. Will replace 421-009 effective July 2022 letting. Replaces SP421-009 . Statewide Use. | |
| SP421-009 | RTF | - VOID - DO NOT USE. This special provision is amended by revising allowance for Type IL cements, use of automated water and slump monitoring systems, and updates for mix design options. Required for all projects using hydraulic cement concrete beginning with the July 2020 letting. Replaces SP421-002 .Replaced by SP421-010 . Statewide Use. | |
| SP421-008 | RTF | - For project 0808-01-061 in Falls County. Item 421, ''Hydraulic Cement Concrete'' of the Standard Specifications is amended with respect to the clauses cited. One-Time Use. | |
| SP421-007 | RTF | - For project 0266-08-013, 0475-01-056 in Brazos, Colorado Counties. Item 421, ''Hydraulic Cement Concrete'' of the Standard Specifications is amended. One-Time Use. | |
| SP421-006 | RTF | - For project 0041-07-106, 0463-04-024 in Glasscock, Potter Counties. When lightweight aggregates are used for internally cured concrete, provide measures to uniformly saturate the material to achieve the target absorbed moisture content. One-Time Use. | |
| SP421-005 | RTF | - For project 2374-02-147 in Dallas County. Item 421, “Hydraulic Cement Concrete” of the Standard Specifications is amended with respect to the clauses cited below. No other clauses or requirements of this Item are waived or changed. One-Time Use. | |
| SP421-004 | RTF | - For project 0808-01-058 in Falls County. The following articles have been revised, ''Aggregates'', ''Mix Design Proportioning'', ''Slump'', ''Optimized Aggregate Gradation Concrete'', ''Final Trial Batches'', ''Delivering Concrete'', ''Testing of Fresh Concrete'', ''Job-Control Testing'' One-Time Use. | |
| SP421-003 | RTF | - For project 0912-70-103 in Harris County. Revises required materials & components. One-Time Use. | |
| SP421-002 | RTF | - VOID - DO NOT USE. Revises mix design options & exceptions for class SS & K, adds method to determine if aggregate combination sand equivalency requirements are met, revises references to Table 4 & 6, & removes all contractor job-control testing requirements. Required on all projects using hydraulic cement concrete beginning with the June 2016 letting. Replaced by SP421-009 . Statewide Use. | |
| SP421-001 | RTF | - For project 0920-30-077 in Orange County. Adds provisions for lightweight concrete. One-Time Use. | |
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