Application of Maturity Concept in Concrete with RHA Addition

Title: Application of Maturity Concept in Concrete with RHA Addition
Author(s): da Silva
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 705 - 714
Total Pages: 10
Nb references: 5
Language: English

Abstract: Steam curing is used to accelerate cement hydration reactions with the purpose to enhance
mechanical strength of concrete at early ages, since hydration reactions are temperature
dependent. In order to evaluate the influence of temperature on the development of mechanical
properties of concrete, the maturity concept is used. This method estimates the development of
these properties according to the temperature history of concrete along the curing process.
The temperature influence can be indicated by the Apparent Activation Energy (Ea) value. The
higher is the Ea value, the more energy will be necessary to start the reactions, and thus the
velocity of these reactions will be affected by temperature.This work is based on an experimental study of steam-cured concrete made with 5% and 10% ofrice husk ash (RHA) addition in which the development of some mechanical properties was
investigated. The rice husk ash used was obtained from uncontrolled autocombustion of rice
husk, in an open chamber, without any control of temperature and burning time. The mechanical
properties investigated were the compressive strength, the tensile strength, and the modulus of
elasticity. The results indicate the influence of RHA addition and its dosage on the hydration
reactions of cement and the mechanical properties of steam-cured concrete.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.078