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
| Dec 7, 2012
Structural glazing sealant protects solar-rooftop stadium in Taiwan
Designers of the Kaohsiung World Games Main Stadium in Gaoxiong, Taiwan, powered by almost 9,000 rooftop solar panels, required an effective panel fixing design offering optimum energy transfer rate, plus thermal and weathertight performance. Dow Corning specialists recommended a four-sided structural sealant solution featuring Dow Corning 983 Structural Glazing Sealant.
| Dec 6, 2012
Ziegler Cooper names Soto as Director of Design, Broadens Design Capabilities
Soto will oversee design efforts, bringing a high level of quality and problem solving capabilities through active engagement with clients and studios firm wide.
| Dec 5, 2012
Gilbane publishes Winter 2012 construction economic report
Report outlines impact of recent events; predicts continued movement, while slow, toward recovery.
| Dec 5, 2012
Gehry-designed New York City tower receives Emporis Skyscraper Award
8 Spruce Street is now the third New York tower to win the Emporis Skyscraper Award.
| Dec 4, 2012
MKK’s Denver Human Services Eastside Building wins ACEC Excellence Award
MKK provided mechanical, plumbing and fire protection consulting services on this LEED-NC Gold project.
| Dec 4, 2012
Thornton Tomasetti opens new office in São Paulo, Brazil
The move to São Paulo is strategic and timely, as the country continues preparations for the 2014 World Cup and 2016 Olympic Games in Rio de Janeiro.
| Dec 4, 2012
Greenhorne & O’Mara signs letter of intent to join Stantec
Acquisitions of C3TS and Architecture 2000 also completed.
| Dec 4, 2012
Sto Corp. announces new distributor in the Carolinas
Company will now have coverage in several parts of North Carolina.
| Dec 4, 2012
Wirtz Beverage Illinois’ corporate headquarters completed
WBI Center, a new state-of-the-art facility, is designed by Ware Malcomb.
| Dec 4, 2012
Wagner joins Ghafari as Manager of Structural Engineering
Wagner comes to Ghafari from Walter P Moore, where he served as a principal, chaired the construction administration task force and led the design of numerous projects ranging in size from $10 million to $70 million.
