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Rockery Specifications <br /> A. Matcrials <br /> 1. Rock Qualrh� <br /> AIl rock shall be sound, �veathering resistant, angular ledge rock. '17ie <br /> longest dimensiou of any iiidividual rock sl�all not exceed Uuee times its <br /> slionest dimension. Acceptability of rock will be deternwiad by laboratory <br /> tests as hereinafter specified, geologic examination and lustorical usage <br /> records. <br /> All rock delivered to and incoq�orated in die project shall meet the <br /> following minimum specifications: <br /> a. Absoqrtion - Not more tl�an 2.0% for igneous and <br /> metamorphic rock types. Not more tUan 3.0% for <br /> sedimentary rock types. <br /> b. Accelerated Eapansion(IS days)(CRD-C- <br /> 143J*1,*2 Not more tlian l5%breakdown. <br /> c. Sow�dness(MgSO4 at 5 cycles)(CRD-C-37). Not <br /> greater tlian 5% loss. <br /> d. Unconfined Compressive Strengtl�ASTMD293S- <br /> 79. Intact strength of I5,000 psi, or greater for <br /> i�ieous and metamorpliic rocks, and 8,000 psi or <br /> greater for sedimentary rock. <br /> •l. The test sample will be prepared and iested in accordance with Corps o(Enginecrs <br /> Testing Procedure CRD-GIJ8, ",1/etl�od ojTesn��g Srone fa• Ez/�nnsive 13renkdo�rn <br /> a� Soaking in Glh�dei�e Glvcol." Test rcquirements of not more than 15% breakdo�am <br /> �vill be computed by dividing the number of individual pieces af initial sample sutTering <br /> breakdovm (that is, separating into hw or more pieces) by Uie total number o(initial <br /> pieces in the sampic. <br /> '2. Accelerated expansion tests should also include analyses of the Gactures and veins <br /> (ound in the rock. Many problems assaiat�d with rockery failures are related to the <br /> rock Gactures and veins found within the rock and not the rock itsel(. <br /> � GES, Inc. <br />