Scientific Foundation of Modern Concrete - The Issues and Discussion of Modern Concrete Science - page 174

Chapter 15
Scienti c Foundation of Modern Concrete

In the rst 14 chapters of this topic, the author has proposed query even negate for

many viewpoints which are recognized by authority in current academia.
In order to guarantee veracity of query and negation, the author has undergone a
lengthy and tough process of verifying, checking, denying; checking again, denying
again. Some viewpoints have gone through more than 10 different construction sites
all over China, and it takes over 10 years to draw the conclusion eventually. For
purpose of examine in uence degree of environmental temperature and moisture on

drying shrinkage accurately in 2006, the author had organized a experimental group
and carried out observation and summary at

five airport construction simulta-

neously field in Urumchi of Xinjiang, Hohhot of Inner Mongolia, Guangzhou,

Beijing, Xi an. Especially for effect of mortar thickness on concrete surface on

drying shrinkage, conclusion was not

'

time
(from the year of 2000 to 2008) and using accurate datum of the three airport
parking aprons in Beijing, Kunming, and Urumchi.
The author would like to appreciate his engineer group: Xi Qing, Feng Zhong-tao,
Han Min-cang, Hou Jun-gang, Zheng He, Wang Zhao-yuan, Lin Xing-gang, Zhou
Yin, Tang Ya-qi, Huang Yu-guo, Du Jing-zhong, Yuan Xiao-juan, Li Jian-jun et al.,
and it is their long-term tireless working,

finally drawn until undergoing 9 years '

fighting at frontline of construction and
verifying every conclusion of the author repeatedly that makes the topic completed.
Since cement has been invent for a hundred of years, any description about
concrete principle and establishment of formula carry with experimental property
and have their applied range. .More speci cally, all having their timeliness. Over

the recent 20 years, development of concrete has stepped into a new era; great
changes have taken place whether from raw material production and construction
technology.
However, theoretical research and advancement are left behind signi

cantly. Our
concrete theories at present, especially some basic theories, is basically old theory
20 years ago, which certainly include famous mix proportion theory, W/C theory,
and utilization of water-reducing agent, fiber, and air-entraining agent. Deviation

and error will emerge when they are introduced in practice of modern concrete,
making lots of important technical decisions at engineering

field are conducted just
basing on experience of engineer. Many queries proposed by the author in this
topic, its essence just lies in this point.