GB/T 31387-2015Reactive powder concrete (English PDF)

Foreword

This Standard is drafted according to rules given by GB/T 1.1-2009.

1 Scope

This Standard specifies the terms, definitions, classification, performance grade, mark, raw materials, mix proportion design, preparation and transportation, conservation, test methods, and inspection rules of reactive powder concrete.

This Standard applies to reactive powder concrete of cast-in-situ or factory prefabrication.

2 Normative references

The following documents are indispensable for application of this document. For the dated documents so quoted, only dated versions apply to this document. For the undated documents so quoted, the latest versions (including all modification sheets) apply to this document.

GB 175 Common Portland cement

GB/T 1596 Fly ash used for cement and concrete

GB 8076 Concrete admixtures

GB/T 18046 Ground granulated blast furnace slag used for cement and concrete

GB/T 21120 Synthetic fibres for cement mortar and concrete

GB/T 26408 Concrete truck mixer

GB/T 27690 Silica fume for cement mortar and concrete

GB/T 28293 Ground iron and steel slag

GB/T 50080 Standard for test method of performance on ordinary fresh concrete

GB/T 50081 Standard for test method of mechanical properties on ordinary concrete

GB/T 50082 Standard for test methods of long-term performance and durability of ordinary concrete

GB 50119 Code for utility technical of concrete admixture

GB 50164 Standard foe quality control of concrete

GB 50204 Code for acceptance of constructional quality of concrete structures

JC/T 874 Methods of chemical analysis of silicious raw materials for cement industry

JGJ 52 Standard for technical requirements and test method of sand and crushed stone (or gravel) for ordinary concrete

JGJ 63 Standard of water for concrete

3 Terms and definitions

The following terms and definitions apply to the document.

4 Classification, performance grade and mark

6 Mix proportion design

6.2.4 Calculation of aggregate volume shall be obtained by that total cement volume subtracts the water volume, cementitious material and steel fiber volume, and the contained gas. The total consumption of aggregate shall be obtained by - aggregate volume multiplies the density of aggregate.

6.2.5 The relative proportions of the various size fractions of aggregate should follow the densest packing theory, go through the trial-match, and be determined after the working performance of mixture is confirmed to meet the requirements. If necessary, it can add the right amount of quartz powder to improve the solidity of the hardened concrete.

6.2.6 The trial-match and the mix proportion adjustment of RPC shall comply with the following provisions.

a) In trial-match of RPC, it shall use raw material that is actually used in engineering.

The minimum mixing amount of each disk of concrete shall be not less than 15 L;

b) In trail match, firstly mix them and check the workability of the mixture. When workability of the mixtures obtained through trial-mix cannot meet the requirements, it shall adjust the cementitious material consumption, admixture consumption or the volume fraction and others under the principle of unchanged water-cement ratio, reasonable cementitious materials consumption and admixture consumption until the workability meets workability. Propose the reference mix proportion for the strength test of RPC according to the mix result;

c) The strength test of RPC shall use at least three different mix proportions. When different mix proportions are used, one of it shall be the reference proportion determined in 6.2.6 b); the water-cement ratio of other two mix proportions shall be increased and decreased by 0.01 respectively by comparing with the reference mix proportion; the water consumption of other twos shall be the same as that of reference mix proportion; the volume percentage of sand can be increased and decreased by 1% respectively by comparing with that of reference mix proportion.

d) In producing strength specimen of RPC, the working performance of the mixture shall be verified whether it meets the design requirements or not. Use this verification result to represent the performance indicator of RPC mixture with corresponding proportion;

e) At least one group (three pieces) of specimens shall be produced for each proportion in the strength test of RPC; they shall be cured in accordance with specified conditions to the required age test pressure. If there are durability requirements, corresponding specimens shall be produced, and corresponding indicators shall be tested;

Static-stop shall be done to RP-type RPC after molding. In static-stop, the ambient temperature shall be more than 10°C, the relative humidity is above 60%, and the static-stop time shall not be less than 6 hours.

8 Curing