A smart initial curing procedure based on pore water under pressure measurement

Title: A smart initial curing procedure based on pore water under pressure measurement
Author(s): Qian Tian, Yujiang Wang, Fei Guo, Jiaping Liu, Changwen Miao
Paper category : conference
Book title: International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
Editor(s): O.M. Jensen, M.T. Hasholt and S. Laustsen
Print-ISBN: 978-2-35158-104-9
e-ISBN: 978-2-35158-105-6
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 273 - 284
Total Pages: 12
Nb references: 13
Language: English

Abstract: This paper illustrated a smart initial curing procedure based on the pore water under pressure (PWP) development of the surface layer of fresh concrete. A mini-type ceramic sensor head was introduced and a wireless monitoring system based on GSM technology was developed, which realized the automatic long-range real-time monitoring of the PWP within the surface layer (5mm from the surface) of fresh concrete. The start of the surface drying of fresh concrete could be judged accurately according to the monitored PWP signal. Using 2kPa of PWP as the threshold of initial curing, several initial curing methods were employed for typical high performance concrete incorporated with 10% silica fume and exposed to extreme conditions with evaporation rate of 1.3-2.6 kg/m2/h. Experimental results indicates that the proposed initial curing procedures not only avoid plastic shrinkage cracking under severe evaporation condition but also improve the surface durability of high performance concrete.

Online publication: 2010-10-04
Publication type : full_text
Public price (Euros): 0.00