Nonresidential fixed investment fell by 0.6 percent during the second quarter of 2015, according to the Associated Builders and Contractors’ (ABC) analysis of the real gross domestic product (GDP) report by the Bureau of Economic Analysis (BEA).

The dip comes after a 1.6-percent increase in the first quarter. Real GDP on the whole expanded by 2.3 percent (seasonally adjusted annual rate) during the second quarter, following a 0.6-percent increase the previous quarter.

ABC notes that the first quarter estimate for nonresidential fixed investment was revised upward from -3.4 percent annualized growth.

“In the first half of 2015, both the broader economy and nonresidential investment lost the momentum they had coming into the year,” says ABC chief economist Anirban Basu. “Rather than indicating renewed progress in terms of achieving a more robust recovery, today’s GDP release indicates that a variety of factors helped to stall investment in nonresidential structures.

“There are many viable explanations, including a weaker overall U.S. economy, a stronger U.S. dollar, decreased investment in structures related to the nation’s energy sector, soft public spending, and uncertainty regarding monetary policy and other abstracts of public policy. While the expectation is that the second half of the year will be better, unfortunately not much momentum is being delivered by the year’s initial six months.”

Investment in nonresidential structures decreased at a 1.6 percent rate after decreasing at a 7.4 percent rate in the first quarter, and personal consumption expenditures added 1.99 percent to GDP after contributing 1.19 percent in the first quarter.

Spending on goods grew 1.1 percent from the first quarter, while real final sales of domestically produced output—minus changes in private inventories—increased 2.5 percent for the second quarter after a 2.5 percent increase in the first quarter.

Federal government spending decreased 1.1 percent in the second quarter after increasing by 1.1 percent in the first quarter, and nondefense spending decreased 0.5 percent after expanding by 1.2 percent in the previous quarter.

National defense spending, meanwhile, fell 1.5 percent after growing 1 percent in the first quarter.

Finally, state and local government spending grew 2 percent during the second quarter after a decrease of 0.8 percent in the first.