Workers unload cement bags from a truck near the construction site of residential buildings in New Delhi, India, March 10, 2016. REUTERS/Anindito Mukherjee 

A labourer moves sacks of cement from one truck to another bound for Afghanistan at a transit depot in Peshawar, Pakistan September 16, 2015. Pakistan and Afghanistan have shelved a raft of agreements that promised to more than triple cross-border trade, officials said, as economic ties seen as key to regional stability fall victim to rivalry and suspicion. REUTERS/Fayaz Aziz 

A man works on a concrete mixer vehicle at a construction site in Tokyo, September 9, 2015. Japan's core machinery orders unexpectedly fell 3.6 percent in July from the previous month, Cabinet Office data showed on Thursday, down for a second straight month and casting doubt about the strength of capital expenditures. Picture taken September 9, 2015. REUTERS/Toru Hanai 

North Korean workers unload bags of cement from a truck on the banks of Yalu River, near the North Korean town of Sinuiju, opposite to the Chinese border city of Dandong, November 6, 2014. Picture taken November 6, 2014. REUTERS/Jacky Chen (NORTH KOREA - Tags: BUSINESS SOCIETY) 

Protesters throw stones during clashes with police in Kiev February 18, 2014. Anti-government protesters clashed violently with police in central Kiev on Tuesday, a day after Moscow moved to cement its influence over Ukraine with $2 billion in cash to shore up the former Soviet state's heavily indebted economy. A parliamentary deputy said on Facebook that three demonstrators had been killed, and Ukrainian television said five protesters had been hurt in the clashes. Neither report could immediately be confirmed. REUTERS/Konstantin Chernichkin (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)

An labourer unloads cement from a truck in Kabul August 21, 2013. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: SOCIETY EMPLOYMENT) 

A worker cleans a cement truck at a ready mixed concrete plant of Siam Cement in Nonthaburi province, on the outskirts of Bangkok July 30, 2013. Siam Cement Pcl, Thailand's largest industrial conglomerate, is finally catching up with the capacity it overbuilt before the Asian financial crisis as it feeds demand from frontier markets including Myanmar and Cambodia. Picture taken July 30, 2013. REUTERS/Kerek Wongsa (THAILAND - Tags: BUSINESS) 

Engineers and workers work at the tunnels of Kishanganga power project in Gurez, 160 km (99 miles) north of Srinagar June 21, 2012. A U.S. intelligence report in February warned fresh water supplies are unlikely to keep up with global demand by 2040, increasing political instability, hobbling economic growth and endangering world food markets. A "water war" is unlikely in the next decade, it said, but beyond that rising demand and scarcities due to climate change and poor management will increase the risk of conflict. That threat is possibly nowhere more apparent than in South Asia, home to a fifth of humanity and rife with historical tensions, mistrust and regional rivalries. Picture taken June 21, 2012. To match Feature WATER-SOUTHASIA/ REUTERS/Fayaz Kabli (INDIAN-ADMINISTERED KASHMIR - Tags: ENVIRONMENT ENERGY BUSINESS CIVIL UNREST) 

A 1948 Ford Sedan car modified into a pick-up truck carrying sacks of cement is driven on a road on the outskirts of Havana April 14, 2012. REUTERS/Desmond Boylan (CUBA - Tags: SOCIETY TRANSPORT) 

A worker wears a respirator as he unloads sacks of cement from a lorry at a construction site in Nanjing, Jiangsu province October 28, 2011. REUTERS/Sean Yong (CHINA - Tags: BUSINESS CONSTRUCTION SOCIETY) 

A Kashmiri man loads cabbages onto a truck at a wholesale vegetable market on the outskirts of Jammu January 10, 2011. India's annual food inflation accelerated for the fifth straight week in late December to the highest in more than a year, reinforcing fears it has spilt over to broader prices and cementing expectations of a January interest rate hike. REUTERS/Mukesh Gupta (INDIAN-ADMINISTERED KASHMIR - Tags: AGRICULTURE BUSINESS FOOD) 

Labourers prepare a loaded truck at the Dangote Cement factory in Obajana village in Nigeria's central state of Kogi November 8, 2010. REUTERS/Akintunde Akinleye(NIGERIA - Tags: BUSINESS) 

Labourers unload packages of cement from trucks at a port in Wuhu, Anhui province July 24, 2010. REUTERS/Stringer (CHINA - Tags: BUSINESS EMPLOYMENT) 

Cranes at Beirut's downtown construction site, developed by Lebanon's biggest company and real estate firm, Solidere, operate in Beirut, September 25, 2009. Shares in Lebanese real estate firm Solidere rallied for a second day on Friday, boosted by expectations of progress towards the formation of a new goverment, traders said. REUTERS/Jamal Saidi (LEBANON BUSINESS) 

A concrete mixing carrier truck is pictured in front of the remains of the collapsed building of the town archive of the German city of Cologne, March 3, 2009. A multi-storey building containing thousands of historical records collapsed into a heap of rubble in the city of Cologne on Tuesday, injuring at least one person and possibly trapping others. Local fire services in Germany's fourth biggest city said that nine people had been reported missing after the collapse of the historical town archive and two neighbouring buildings. Sniffer dogs were out in search for those missing, they said.
REUTERS/Ina Fassbender (GERMANY) 

Members of the emergency services gather near to the collapsed building of the town archive of the German city of Cologne, March 3, 2009. More than 200 rescue workers rushed to the scene in the south of the city after the collapse of the multi-storey building, which German media said may have been sparked by work on an underground train line. At least one person was injured and possibly others are trapped inside, a Cologne police spokesman said, adding the cause for the collapse was still unclear. In background is Cologne Cathedral. REUTERS/Ina Fassbender (GERMANY) 

A cement truck is reflected in an office building's windows as it drives down a freeway in Sydney December 9, 2008. REUTERS/Tim Wimborne (AUSTRALIA) 

Customs officers check sacks with cement on a truck after its arrival from Afghanistan to Panji Poyon border outpost, some 150km (94 miles) south of capital Dushanbe, May 31, 2008. Picture taken May 31, 2008. To match feature TAJIKISTAN-DRUGS/ REUTERS/Shamil Zhumatov (TAJIKISTAN) 

A supporter of Kenya's Orange Democratic Movement presidential candidate Raila Odinga shouts slogans during an electoral campaign in Kisumu, 350km (218 miles) west of the capital Nairobi, November 29, 2007. Supporters say an Odinga victory would be justice for a man whose common touch helped cement Mwai Kibaki's 2002 win and who, they say, was promised the position of prime minister but betrayed. Picture taken November 29, 2007. To match feature KENYA-ELECTION/OPPOSITION REUTERS/Thomas Mukoya (KENYA) 

Labourers work on a road project in Falluja, 50 km (30 miles) west of Baghdad November 22, 2007. Falluja, once the heart of Iraq's bloody insurgency, is hoping to trade mortar bombs for brick and mortar construction as the city seeks to repair war wounds and renew frayed public works. Picture taken November 22, 2007. To match feature IRAQ/FALLUJA. REUTERS/Mohanned Faisal (IRAQ) 

A clean-up crew works around a toppled cement mixing truck that lies amidst the wreckage of the collapsed Interstate 35W bridge that spans the Mississippi River near Minneapolis August 6, 2007. REUTERS/Eric Miller (UNITED STATES) 

A labourer transports limestone for making cement at a stone pit on the outskirts of Wuhu, east China's Anhui province March 30, 2007. China's central bank expects the economy to slow a little in 2007, but to maintain double-digit growth for the fifth year in a row, according to a report by its research division published on Friday. REUTERS/Jianan Yu (CHINA) 

Indian labourers work at a construction site of an upcoming large shopping mall in Mumbai March 19, 2007. REUTERS/Arko Datta (INDIA) 

A vehicle travels past the Mochovce Nuclear Power Plant cooling towers in Mochovce March 15, 2007. Slovakia's main power producer Slovenske Elektrarne (SE), owned by Italy's Enel, is considering borrowing 840 million euros ($1.1 billion) to finance construction of the third and fourth blocks of Slovakia's Mochovce nuclear power plant, Giancarlo Aquilanti, Director of Mochovce 3-4, said. REUTERS/David W Cerny (SLOVAKIA)