AS 3583.6 pdf download

AS 3583.6 pdf download.Methods of test for supplementary cementitious materials
1 SCOPE
This Standard sets out the reference method for determining the relative water requirement and two methods, one the standard test and the other an accelerated test, for determining the strength index of fly ash and slag only. Both properties are determined by comparing results for a test sample mortar with results for a General Purpose cement mortar. The methods do not provide a basis for comparison between different types of supplementary cementitious materials because of the differing total binder volumes used with each. Also, since the performance of these materials is affected by interaction with the cement, the test results for a given sample are dependent upon the properties of the cement used. The results for relative water requirement and strength index should not be used to infer potential concrete performance. Relative water requirement and strength index for amorphous silica should be performed according to the appropriate method given in ASTM C1 240 Standard Specification for Silica Fume Used in Cementitious Mixtures.
3 DEFINITIONS
For the purpose of this Standard the definitions given below apply. 3.1 Control mortar A mortar prepared using a selected General Purpose cement without addition of supplementary cementitious material. 3.2 Test mortar A mortar prepared using a mixture of the test material and the General Purpose cement used for the control mortar.
4 PRINCIPLE
4.1 Relative water requirement A control mortar is prepared using the amount of water required to give a specified flow. A test mortar having the same flow is prepared and the relative water requirement is calculated from the ratio of the water additions for the respective mixes. 4.2 Strength index Compressive strength determinations are performed on prismatic specimens made from control and test mortars prepared in the same manner as for the determination of the relative water requirement. The strength index of the test sample is calculated by expressing the test mortar strength as a . percentage (%) of the control mortar strength.
7 PREPARATION
7.1 General In the determination of relative water requirement and strength index, results for the test mortar are related to results for the control mortar. It is therefore necessary to prepare a control mortar on each day that one or more test mortars are prepared. 7.2 Control mortar A batch of control mortar shall consist of 450+2 g of cement，1350 +2 g of sand and sufficient water to achieve a flow of 110+5% when determined in accordance with AS 2701 (nominally 210 g water). 7.3 Test mortar Slag and fly ash shall be prepared in accordance with Table 1. A batch of test mortar shall consist of the quantities of Type GP cement and a test sample of slag or fly ash as shown in Table 1, 1350+2 g of standard sand, and sufficient water to achieve a flow within+3 units of the flow recorded for the control mix.
8.3 Test mortar The procedure shall be as follows: (a) Mix the batch of mortar as described in AS 2350.12. (b) Measure the flow of the mortar as described in AS 2701. If the flow is not within three units of the flow recorded for the control mortar, the mortar shall be discarded and a new batch prepared with an adjusted water content. (c) Provided the flow is within three units of the figure recorded for the control mortar, record the mass of water used and the flow. (d) Discard the mortar batch used to determine the flow. 8.4 Strength index specimens The procedure shall be as follows: (a) Prepare, mix and cure each set of three specimens as described in AS/NZ 2350.11 and AS 2350.12, using the water contents determined in Clauses 8.2 and 8.3 above. (b) Demould each set of specimens as described in AS/NZ 2350.11. . (c) For a standard test, cure the specimens in lime saturated water at 23 +2°C, as described in AS/NZ 2350.11, before testing at an age of 28 days (see Note 1). . (d) For an accelerated test, after initial 24 h curing in the humidity cabinet, cure the specimens in lime saturated water at 23 +2°C, as described in AS/NZS 2350.11 for 4 days士1 h. Remove and immerse the specimens in a water bath at 50土1°C for 46 h +0.5 h. Remove and condition the specimen in water at 23士2°C for 2 h +0.25 h before testing at age seven days (see Note 2). NOTES: 1 Caution should be exercised when attempting to correlate results between 28 day and 7 day (accelerated) results. Where possible, 28 day results should be used – they are more reliable. 2 Specimens from both the control mortar and the test mortar should be subjected to the same curing regime.