Abstract
Some simple and rapid tests were tried out, which were the tests to get water absorption of rock fragments (WSL) and of the commuted and desiccated powder of the same rock (WA). The extent of slaking (rapid disintegration of soft rock in process of water absorption) is observed during the WSL-test.The extent of slaking is ranked in 5 grades (A-E) in observation and closely related to the following index of slaking (ISL).ISL= (WSL-WSAT) / (WA-WSAT) WSAT means saturated moisture content of intact rock before slaking or swelling.The maximum swelling strain (or expantion: ΔV/V0) or pressure (PSW) is sufficiently estimated from the values of WA and γd (dry density) or WSAT which are able to measure simply. WA represents the latent possibility of expantion of the constituent particles upon removal of the cementation of rock fragments regardless of the clay mineral composition.The maximum value of ΔV/V0 in an intact rock is corresponded to the ΔV/V0 of the artificially compacted rock after commuting, and the ΔV/V0 of the intact rock in any drying and wetting process can be estimated from this maximum ΔV/V0 multiplied by the ISL. ΔV/V0-WA-γd diagram and the photographs illustrating the typical features of slaking in each grade are prepared in this paper to estimate ΔV/V0 and ISL easily.
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