AS 3583.6:2018 pdf free.Methods of test for supplementary cementitious materials Method 6: Determination of relative water requirement and strength index.
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.
5 APPARATUS
The following apparatus is required:
(a) All apparatus as specified in AS/NZS 2350.11 and AS 2350.12.
(b) Flow table, callipers and tamping rod, as specified in AS 2701.
(c) Water bath for accelerated test. A water bath capable of being maintained at 50±1°C for a minimum time period of 46 ±0.5 h.
6 1ATERIALS
Standard sand and water as specified in AS 2350.12. The cement used shall be General Purpose (Type GP) cement conforming with AS 3972. The same sample of cement shall be used for control and test mortars.
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 sufflcient 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 I.
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.AS 3583.6 pdf download.