Transport and Main Roads Specifications MRTS70 Concrete

1 Technical Specification Transport and Main Roads Specifications MRTS70 Concrete November 2018 Transport and Main Roads Specifications , November 2018 Copyright The State of Queensland (Department of Transport and Main Roads ) 2018. Licence This work is licensed by the State of Queensland (Department of Transport and Main Roads ) under a Creative Commons Attribution (CC BY) International licence. CC BY licence summary statement In essence, you are free to copy, communicate and adapt this work, as long as you attribute the work to the State of Queensland (Department of Transport and Main Roads ). To view a copy of this licence, visit: Translating and interpreting assistance The Queensland Government is committed to providing accessible services to Queenslanders from all cultural and linguistic backgrounds. If you have difficulty understanding this publication and need a translator, please call the Translating and Interpreting Service (TIS National) on 13 14 50 and ask them to telephone the Queensland Department of Transport and Main Roads on 13 74 68.

2 Disclaimer While every care has been taken in preparing this publication, the State of Queensland accepts no responsibility for decisions or actions taken as a result of any data, information, statement or advice, expressed or implied, contained within. To the best of our knowledge, the content was correct at the time of publishing. Feedback Please send your feedback regarding this document to: Transport and Main Roads Specifications , November 2018 i Contents 1 Introduction ..1 Registered Products and Suppliers .. 1 2 Definition of terms ..2 3 Referenced documents ..4 4 Standard test methods ..6 5 Quality system requirements ..7 Hold points, Witness Points and Milestones .. 7 Construction procedures .. 8 Conformance requirements .. 9 Testing Frequency .. 9 6 Concrete class ..9 Designation .. 9 Normal class Concrete .. 10 Special class Concrete .. 10 7 Materials .. 10 General .. 10 Cementitious materials .. 10 Cement .. 10 Fly ash .. 11 Slag ground granulated iron blast-furnace.

3 11 Amorphous silica .. 11 Cementitious blends .. 11 Water .. 12 Chemical admixtures .. 12 Concrete aggregate .. 13 General .. 13 Fine aggregate .. 13 Coarse aggregate .. 13 Aggregate assessment source rock .. 13 Aggregate assessment products .. 15 Aggregate conformance .. 15 Curing compounds .. 16 8 Storage of materials .. 16 Cementitious materials .. 16 Aggregates .. 16 9 Concrete mix design and acceptance .. 16 General .. 16 Proposed mix design .. 16 Target 17 Nominated slump and spread .. 18 Constituent materials .. 18 Transport and Main Roads Specifications , November 2018 ii Cementitious content and maximum water-cement ratio .. 18 Combined aggregate grading .. 19 Water Retention Testing .. 20 Specific exposure class requirements .. 20 Exposure Class B2 or less .. 20 Exposure Class C mixes .. 20 Chloride content testing .. 21 Testing of hardened Concrete .. 21 Individual components and calculation .. 21 Super-workable Concrete (SWC).

4 21 High workability Concrete .. 22 Mix design acceptance .. 22 10 Batching, mixing and Transport .. 23 General .. 23 Batching .. 23 Mixing .. 23 Transport and delivery .. 24 Long distance travel and extended placement times .. 24 11 Acceptance and rejection of plastic Concrete .. 25 Rejection of plastic Concrete .. 26 Slump or spread below tolerance .. 26 Slump, or spread, above tolerance .. 26 Addition of admixtures .. 27 Reduced rates of testing .. 27 12 Acceptance and rejection of hardened Concrete .. 27 General .. 27 Sampling .. 27 Acceptance testing of specimen cylinders .. 28 Monitoring of Concrete strength .. 29 Acceptance or rejection of hardened Concrete on the basis of strength .. 30 13 Environmental limits for concreting operations .. 30 Temperature limits .. 30 Evaporation Limits .. 31 General .. 31 Application of evaporation retarding compound .. 31 Method for calculation of evaporation rates .. 31 Protection from rain.

5 32 14 Defects and rectification .. 33 15 Requirements for insitu Concrete .. 33 Mix designs .. 33 Trial mixes .. 33 Trial mix conformance .. 34 Testing procedures (compressive strength) .. 35 Transport and Main Roads Specifications , November 2018 iii General .. 35 Curing of specimen cylinders .. 36 Early stripping and / or loading .. 36 Further construction prior to 28 day testing .. 36 Falsework .. 36 Formwork, bar chairs and spacers .. 37 Formwork .. 37 Supports (bar chairs and spacers) .. 38 Concrete temperatures .. 39 High cementitious contents .. 40 Large elements .. 40 Placing and compacting Concrete .. 41 General .. 41 Compaction of Concrete (excluding cast-in-place piles) .. 42 Placement under water .. 43 Use of spalls .. 44 Further construction prior to 28 day testing .. 44 Dimensional tolerances .. 45 General .. 45 Dimensional tolerances .. 45 Positional tolerances .. 45 Relative position .. 45 Removal of formwork.

6 46 Early loading .. 46 Finishing operations .. 46 General .. 46 Prevention of cracking .. 47 Top surface of decks and relieving slabs .. 47 Other cast-in-place surfaces .. 47 Special finishes .. 47 Curing .. 47 General .. 47 Water curing .. 47 Membrane curing (compounds) .. 47 Membrane curing (sheeting) .. 48 Surface dressing of Concrete .. 48 Formed surfaces .. 48 Rectification of non-compliant 49 Construction joints .. 49 Construction Joints in Marine and Other Aggressive Environments .. 50 16 Requirements for precast and precast prestressed Concrete .. 50 Mix designs .. 50 Trial mixes .. 50 Trial mix conformance .. 51 Testing procedures (compressive strength) .. 51 Normal rate of testing .. 51 Reduced rate of testing .. 51 Formwork, bar chairs and spacers .. 52 Formwork .. 52 Supports (bar chairs and spacers) .. 52 Concrete temperatures .. 53 Transport and Main Roads Specifications , November 2018 iv High cementitious contents.

7 54 Large elements .. 54 Placing and compacting Concrete .. 55 General .. 55 Compaction of Concrete .. 56 Finishing operations .. 57 General .. 57 Prevention of cracking .. 57 Degrees of finish .. 57 Curing .. 57 General .. 57 Water curing .. 58 Membrane curing (compounds) .. 58 Heat accelerated curing .. 58 Surface dressing of Concrete .. 63 Formed surfaces .. 63 Rectification of non-compliant 64 Construction joints .. 64 Construction Joints in Marine and Other Aggressive Environments .. 65 17 Normal Class Concrete .. 65 Concrete class .. 65 Materials .. 65 Cementitious Materials .. 65 Chemical admixtures .. 65 Concrete aggregate .. 65 Alkali reactive materials .. 66 Curing compounds .. 66 Storage of materials .. 66 Concrete mix .. 66 Batching, mixing and Transport .. 66 Long distance travel and extended placement times.. 66 Acceptance and rejection of plastic Concrete .. 67 Acceptance and rejection of hardened Concrete .

8 67 Defects and rectification .. 67 Falsework .. 67 Formwork .. 68 Supports (bar chairs and spacers) .. 68 Placing and compacting Concrete .. 68 General .. 68 Compaction of Concrete .. 68 Tolerances .. 68 General .. 68 Dimensional tolerances .. 68 Positional tolerances .. 69 Relative position .. 69 Finishing operations .. 69 General .. 69 Prevention of cracking .. 69 Other cast-in-place surfaces .. 70 Transport and Main Roads Specifications , November 2018 v Special finishes .. 70 Curing .. 70 General .. 70 Water curing .. 70 Membrane curing .. 70 Early loading .. 70 Removal of formwork .. 70 Surface dressing of Concrete .. 70 Formed surfaces exposed to view .. 70 Construction joints .. 71 Requirements for no-fines Concrete .. 71 Cementitious content .. 71 Aggregate grading .. 71 Compaction of no fines Concrete .. 71 Kerb and channel Concrete .. 72 General .. 72 Compressive strength and cementitious content .. 72 Appendix A: Tracking of Concrete strengths.

9 73 Technical Specifications , MRTS70 Concrete Transport and Main Roads Specifications , November 2018 1 1 Introduction This Technical Specification applies to the construction of Concrete road and bridge structures and may also be applied to other specified Concrete elements. For Concrete pavements refer to MRTS39 Lean Mix Concrete Sub-base for Pavements and MRTS40 Concrete Pavement Base and for Concrete for machine-manufactured Concrete drainage pipes refer to MRTS25 Steel Reinforced precast Concrete Pipes and MRTS26 Manufacture of Fibre Reinforced Concrete Drainage Pipes. The aim of this Technical Specification is to achieve Concrete of the required strength, durability and appearance. It describes the materials, supply, placing, compacting, finishing, curing and measurement of Concrete . All Concrete shall be manufactured and supplied in accordance with the requirements of AS 1379, where covered by its scope, and the additional requirements of this Technical Specification. This Technical Specification shall be read in conjunction with MRTS01 Introduction to Technical Specifications and other Technical Specifications as appropriate.

10 The use of commentary text, such as this, is covered by MRTS01 Clause 16. For clarity, this Technical Specification is divided into sections which identify the requirements for the various Concrete types and elements. Table 1 Clause applicability of MRTS70 Clauses Insitu Concrete precast and Prestressed Concrete Special Class Normal Class Special Class Normal Class 1 6 X X X X 7 14 X X 15 X 16 X 17 X X Registered Products and Suppliers The requirements for the construction of Concrete elements include the use of registered products and suppliers. For information regarding these products and suppliers refer to the Transport and Main Roads website, , or email Structures Construction Materials Technical Specifications , MRTS70 Concrete Transport and Main Roads Specifications , November 2018 2 Note the differing submission requirements throughout this Technical Specification. Some approvals ( procedures) are wholly dealt with by registration, some submissions ( mix designs, Hold Points) are assessed by Structures Construction Materials but signed off by the Administrator after receipt of a certificate or similar, and others ( niche project specific requirements) are assessed by the Administrator.