水温碎石（Water temperature macadam）.docVIP

水温碎石（Water temperature macadam） Discussion on design and construction of water stabilized granular aggregate -|BB published in 2005-6-14 9:52:00 Zhuyue The cement stabilized aggregate as road base, has high early strength, the impact of the rainy season of construction is relatively small, the degree of mechanization of construction features, which are conducive to ensure the progress and quality, so it is more and more widely used in Highway Engineering in recent years, our company has conducted several construction projects of water stable aggregates, such as Tang Jin expressway, riverbanks engineering, 106 National Highway, the highway reconstruction project and the present in the construction of 307 National Highway, the composition design and construction experiences. I. characteristics of water stabilized aggregate 1, advantages: (1) early strength, short time (5~7 days) can be more than 2.0Mpa intensity. (2) the stability is good, the structural layer itself has certain permeability, and is less affected by water. (3) according to the design requirement, the required strength is adjusted by changing the composition design, while the strength of other structural layers is restricted by the material itself. (4) mechanized construction, good quality, rapid progress, small section of sporadic projects, you can use simple machinery or manual mixing, paving, flexible and economic. 2, shortcomings: (1) strength after the formation of easy to produce shrinkage crack, the crack is one of the major diseases of water stable aggregates, can cause cracking of the upper layer, resulting in the rainy season when water caused the early damage of roadbed, road embankment, shorten the service life. (2) segregation is easy during construction. (3) after the strength is formed, the surface of the wheel is easily peeled off and worn under the action of external force such as wheel. (4) short delay time, from mixing to rolling molding, should be completed in a relatively short per