| 单词 | pit sand |
| 释义 | > as lemmaspit sand pit sand n. excavated sand, as opposed to sand from a river bed, the sea bed, or a beach. ΘΚΠ society > occupation and work > materials > raw material > sand > [noun] > types of river sand1579 callis sand1594 pit sand1700 greensand1831 1700 Moxon's Mech. Exercises: Bricklayers-wks. 6 You may put three parts of Sand that is digged (or pit Sand) and one part of Lime to make Morter. 1876 W. H. Preece & J. Sivewright Telegraphy 185 A cement composed of equal parts by weight of fine pit sand, Portland cement, and plaster of Paris. 1944 W. Morgan in R. Greenhalgh Pract. Builder ix. 28/1 The coarse aggregate usually consists of gravel and the fine aggregate of pit sand which is composed of hard siliceous grains (sea sand contains injurious salts). 2004 Weekly Times (Austral.) (Nexis) 25 Feb. (Country Living) 66 The best propagation medium or mix is one part each of coarse river or pit sand and coir (coco-peat). < as lemmas |
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