Resistance of self compacting concrete to internal sulphates attack

الملخص EN

The objective of this work is to study the resistance of SCC concrete to internal sulphates attack.

The self-compacting concrete is made by using a local filler (pigment and metakaolin).

A mix of selfcompacting concrete was designed according to special specifications and trials.

This mix was tested by various fresh concrete workability tests as Slump-flow, T 50cm, L.box, U.box, and V.funnel tests.

Five levels of SO3 content in (fine aggregate) sand were investigated , these levels were about [0.24 %, 0.5 5, 1 5, 2 % and 3%].

Which yield [3.05 %, 3.47 %, 4.28 %, 5.9 %, and 7.52 %] total SO3 content by weight of cement respectively for SCC mixes with pigment powder filler and [3.08 %, 3.5 %, [4.31 %, 5.94 % and 7.56%] for SCC mixes with metakaolin powder.

The experimental results show that there is an optimum gypsum content in sand (SO3 = 1.0 %) by wt.

of sand which gives the highest results in compressive strength, flexural strength and ultrasonic pulse velocity of SCC.

As gypsum content increases beyond this limit the above mechanical properties will be decreased.