State inspectors in Shenzhen, China, have found at least 15 local plants producing concrete with unprocessed sea sand. Thirty-one companies have been cited for violations, and eight were ordered to suspend business for a year. Construction on multiple projects in Guangdong Province—including the 660-m Ping'an Finance Center—has been halted during the inspection. (Only 80 meters of the Ping'an building has been erected so far; China Construction First Building Group Corp. Ltd. is the primary contractor.)
Unprocessed sea sand is illegal to use as an aggregate in concrete because its chlorine and salt content are corrosive to steel, causing buildings to degrade and potentially collapse within a few decades. River sand, the preferred material, costs twice as much and is in short supply.
The scandal is currently confined to Shenzhen but could spread to other cities given the obvious financial incentives for using sea sand. Inspectors also found that two large sand pits were using seawater instead of fresh water to rinse sand, also a problematic practice.
Industry experts express particular concern because China currently has nine of the putative 20 tallest buildings in the world currently under construction, as well as many other skyscrapers.
(http://www.scmp.com/news/china/article/1191896/shenzhen-construction-hold-after-alert-over-cheap-sand-concrete)
Related Stories
| Oct 23, 2013
Some lesser-known benefits of metal buildings
While the durability of metal as a construction material is widely recognized, some of its other advantages are less commonly acknowledged and appreciated.
| Oct 23, 2013
Architecture Billings Index hits seven-month high in September
AIA's Architecture Billings Index was 54.3 in September, the highest level since February 2013
| Oct 18, 2013
Meet the winners of BD+C's $5,000 Vision U40 Competition
Fifteen teams competed last week in the first annual Vision U40 Competition at BD+C's Under 40 Leadership Summit in San Francisco. Here are the five winning teams, including the $3,000 grand prize honorees.
| Oct 18, 2013
A picture’s worth a thousand words… if you can find it
Photographs are becoming more essential to project communication and documentation. Recently, I sat in a local airport integration project meeting in which the owner outlined their expectation for construction documentation. One of the first requirements was to provide photographs throughout the building process.
| Oct 18, 2013
Researchers discover tension-fusing properties of metal
When a group of MIT researchers recently discovered that stress can cause metal alloy to fuse rather than break apart, they assumed it must be a mistake. It wasn't. The surprising finding could lead to self-healing materials that repair early damage before it has a chance to spread.
| Oct 18, 2013
Call for submissions: AIA Emerging Professionals Summit essays
The American Institute of Architects (AIA) is seeking essays that will address what role architects will play in society in 2033.
| Oct 16, 2013
5 secrets of successful entrepreneurs
If you’re on the outside looking in, successful entrepreneurship may seem mysterious. But it isn’t. Here are five patterns of behavior that are common to successful entrepreneurs.
| Oct 15, 2013
High-rise Art Deco courthouse gets a makeover in Amarillo, Texas
Recognized as one of the most significant Art Deco courthouses in Texas, the Potter County Courthouse is modernized and restored to its 1930s aesthetic.
| Oct 10, 2013
Behind the scenes at the U40 Summit: See the $5,000 U40 Vision competition in progress [slideshow]
Sixty-five up-and-coming AEC leaders are battling for $5,000 in prizes today at BD+C's Under 40 Leadership Summit in San Francisco.
| Oct 10, 2013
Arthur Gensler to architects: Don't give away your ideas
The founder of Gensler advises dozens of up-and-coming AEC professionals at BD+C's Under 40 Leadership Summit in San Francisco.
