Back to Basics - How raw material properties can impact concrete performance

For details on upcoming Concrete Institute of Australia events, please see the CIA website:  or contact the Queensland Branch Office on (07) 3227 5208 or [email protected].

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Wednesday, 15 August 2018
5:30 PM - 7:30 PM


Douglas Campus Room, James Cook University
Building 134 (Education Central), Room 021 , Townsville QLD 4810


Although concrete can be a relatively simple material to both design and produce, the properties of its primary constituent materials - that is, cement and SCM’s, aggregates and admixtures - can have a massive impact on the performance of a concrete mix, both in the plastic and/or the hardened states. The seminar will draw on the experiences of speakers from the raw materials supply industry who will explain how each of the 3 constituent materials can affect critical concrete performances. 
Aspects such as the impact of cement fineness on setting times, the effect of an optimised overall aggregate grading on pumpability and the benefits of minute bubbles of air on workability will all be explained in detail - along with many other key aspects. 
The seminar will have a strong focus on technology and will aim to provide the audience with an opportunity to go "back to basics" in terms of concrete technology and will be of benefit to both seasoned practitioners as well as newcomers to the world of concrete technology who want to understand the root causes of why concrete behaves the way it does.


CIA Members $33.00 CIA Student Members $20.00 CIA Retired Members $20.00 Non-members $44.00


Bruce Perry
Cement Australia Pty Ltd

Justin Matson
Technical Manager Aggregates - Lafarge Holcim


The properties of cement and SCM's and how they impact concrete performance
Bruce Perry, Cement Australia
Portland Cement was invented by Joseph Aspdin way back in 1824 and although not much has changed in the way of its composition, modern General Purpose cements are now manufactured in very efficient and complex facilities where QC and QA systems are highly evolved.  The properties of cements can, however, be controlled to impact the way that concrete behaves.  Aspects such as fineness will affect both shrinkage and ultimate strength. The addition of gypsum during the milling of clinker can also control the setting characteristics of concrete - including undesirable false and flash setting. The ratio of the different silicates in clinker give rise to different strength gain characteristics.  All of the above - and much more - will be discussed in detail.
Supplementary Cementitious Materials (SCM's) are now a key part of a modern concrete mix design but their properties can have a massive influence on how concrete behaves. Although fly ash is the predominant SCM in North Qld., the use of binary slag binders are soon to be permitted in MRTS70. The presentation will cover the key differences between fly ash & slag in both the plastic and hardened concrete states.

Aggregates and their effect on concrete
Justin Matson, Technology Manager Aggregates - Lafarge Holcim
Concrete Aggregates Coarse and fine typically form up to 75% of the total concrete mix. In the modern era concrete coarse aggregates are now sourced primarily from hard rock crushed quarry operations, sands are now increasingly being sourced from hard rock quarry operations eg Manufactured Sands as access to good quality alluvial deposits continues to diminish. The properties of Coarse and fine aggregates each have a unique and significant contribution to concrete in its plastic and hardened state. The shape and mineralogy of the Coarse Aggregates primarily impact water demand, workability, drying shrinkage and bond strength. Whilst the Fine aggregates also impact on the mentioned factors the fine aggregate has a unique contribution to bleed and plastic shrinkage, and the overall finishability of the mix. This presentation will also look at deleterious materials and minerals to avoid or minimise and recent innovations in the processing of aggregates to ensure a consistent and high quality concrete mix.

Concrete Admixtures: Basics and advances in technology
Bruce Perry, Cement Australia 
Admixtures provide certain beneficial effects to concrete, including reduced water demand, increased workability, controlled setting and hardening, improved strength and better durability.
Proper selection of admixtures however, is necessary to achieve the desired fresh and hardened properties of concrete. One needs to carefully evaluate not only factors such as the compatibility of the admixture combination but also their interaction with other ingredients in a mix design.
It is therefore important to understand the mode of action and effects of both, conventional admixtures and those based on advanced and new technologies. 


5.00 pm Registration Commences
5.30 pm Welcome & Introduction
5.35 pm Commencement of Speaker Presentations
7.30 pm Question time to panel of Speakers
 Light refreshments served after conclusion of event
8.00 pm Seminar closes

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