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
Sponsored | | Apr 23, 2014
Ridgewood High satisfies privacy, daylight and code requirements with fire rated glass
For a recent renovation of a stairwell and exit corridors at Ridgewood High School in Norridge, Ill., the design team specified SuperLite II-XL 60 in GPX Framing for its optical clarity, storefront-like appearance, and high STC ratings.
| Apr 22, 2014
Transit-friendly apartment building now under construction
The new $44 million community is situated on eight acres, directly adjacent to the local Park-n-Ride, and a quick walk from a nearby light rail station.
| Apr 22, 2014
Bright and bustling: Grimshaw reveals plans for the Istanbul Grand Airport [slideshow]
In partnership with the Nordic Office of Architecture and Haptic Architects, Grimshaw Architects has revealed its plans for the terminal of what will be one of the world's busiest airports. The terminal is expected to serve 150 million passengers per year.
| Apr 21, 2014
10 design-build best practices
Design-build requires more than a good contract and appropriate risk allocation, says the DBIA. Everyone from the owner to the subcontractors must understand the process, the expectations, and fully engage in the collaboration.
| Apr 18, 2014
Multi-level design elevates Bulgarian Children's Museum [slideshow]
Embodying the theme “little mountains,” the 35,000-sf museum will be located in a former college laboratory building in the Studenski-grad university precinct.
| Apr 17, 2014
Online mapping tool helps teams determine multifamily project tax credit eligibility
Accounting and advisory firm Baker Tilly has launched a new, interactive online mapping tool that helps users determine if a business or development project may qualify for the New Markets Tax Credit or Low-Income Housing Tax Credit program.
Sponsored | | Apr 17, 2014
Technology enables state transportation agency to make the leap to digital design review
Earlier this month, my colleague and I presented a session to a group of civil engineers and transportation agencies about the tech trends in the AEC space. Along with advice on how to prepare your plan for controlled collaboration, we also talked through some practical use cases. One such use case was especially interesting, as it outlined a challenge not unfamiliar to government agencies who are contemplating the leap from paper to digital processes: how to securely migrate workflows.
| Apr 16, 2014
Upgrading windows: repair, refurbish, or retrofit [AIA course]
Building Teams must focus on a number of key decisions in order to arrive at the optimal solution: repair the windows in place, remove and refurbish them, or opt for full replacement.
| Apr 15, 2014
12 award-winning structural steel buildings
Zaha Hadid's Broad Art Museum and One World Trade Center are among the projects honored by the American Institute of Steel Construction for excellence in structural steel design.
| Apr 15, 2014
First look: Zaha Hadid reveals designs for dreamy sculptural hotel - CORRECTED
Hadid's design, which will become the fifth hotel tower in the City of Dreams entertainment hub, features a latticed exoskeleton enveloping the building's exterior. The 40-floor, 150,000-square-foot space is envisioned as a monolith with voids carved throughout.
