So called white cementsare now being manufactured.
Some cements set and harden more rapidly than others, and concrete hardens more and more slowly as the temperature falls.
These fabrics and cements are in most cases superior in toughness, flexibility, ease of application, etc.
It takes away the soluble cements of rocks; it widens fissures and joints and opens winding passages along the bedding planes; it may even remove whole beds of soluble rocks, such as rock salt, limestone, or gypsum.
These cements are deposited between the fragments of shells and corals, the grains of sand and the particles of mud, binding them together into firm rock.
The term Natural Cements is applied to cements made by burning mixtures of clay and carbonate of lime naturally occurring in approximately suitable proportions.
Under this term are comprehended all cements whose setting properties primarily depend on the hydration of calcium sulphate.
These irregular cements of the Portland class are good building materials for ordinary purposes, but are not so suitable as good artificial Portland cement for heavy and important undertakings.
It was a natural transition to utilize these cements not merely for jointing masonry but also for making concrete, and the only reason why hydraulic cements, as distinct from cements which are not hydraulic (e.
The earliest forms of cements of the Portland class were the hydraulic limes.
We have here the two classes into which hydraulic cements are divided.
American "natural" cements are of a somewhat different class.
This may be almost chemically pure, when it is generally used for Keene's cement; or it may contain smaller or greater quantities of impurities, in which case it is suitable for the preparation of cements of the plaster of Paris class.
The simplest of all pozzuolanic cements would be a mixture of pure lime and hydrated silica, but though the latter is prepared artificially for various purposes, it is too expensive to be used as a cement material.
It might be supposed that hydraulic cements from their nature would be indifferent to the action of water, but this is only true if the structures of which they form part are sufficiently compact.
All of these early cements are called natural cements by engineers nowadays, because they were made from natural rock.
Cements made with lime and blood, scraped cheese, or curd, may be regarded as inferior varieties of it.
The general principles that ought always to be borne in mind having been mentioned, the manufacture and uses of some of the more useful cements may be described.
This cement being nearly colourless, possesses advantages which liquid glue and other cementsdo not.
It is a matter of simple and direct observation, about which there is no controversy, that many minerals are deposited as cements in the openings in rocks or replacing rocks.
Limestone cements well, but in other qualities it is not desirable for heavy traffic.
The principal cements used in the manufacture of emery wheels are as follows, each representing the cement for one make of wheel:-- 1.
Cements used in the manufacture of emery wheels, ii, 38.
For this reason some very rightly never make use of cements containing these things, because brick dust and salt alone, especially rock salt, are able to extract all the silver and copper from the gold and to attract it to themselves.
His Raillery always puts the Company into little Divisions and separate Interests, while that of Callisthenes cements it, and makes every Man not only better pleased with himself, but also with all the rest in the Conversation.
We are made for the Cements of Society, and came into the World to create Relations among Mankind; and Solitude is an unnatural Being to us.
The friendships of the world can exist no longer than interest cements them.
The buds become independent corallites and secrete an excess of calcareous matter at their bases, which cementsthem to the parent stock and increases the thickness of the branch.
Solutions of shell-lac, gum, and various other cements and glues are employed by microscopic manipulators.
The hardening of the common mortars and cements is in a great measure due to the gradual absorption of carbonic acid; but even after a very great length of time this conversion into carbonate is not complete.
Water gas tars and asphalts are sometimes mixed to produce road materials, and likewise native asphalts and residues obtained from petroleum are sometimes mixed to produce asphalt cements for paving mixtures.
Asphalt cements are used for sheet asphalt and asphaltic concrete construction and for hot-mixed bituminous macadam.
Oil asphalts are used for dust layers, for binders for macadam roads, for asphalt cements for sheet pavement surfaces, and for fillers for block pavements and expansion joints.
In bricklaying with quick-setting cements an ample use of water is of even more importance.
Of the various cements used in building, it is necessary only to mention three as being applicable to use for mortar.
It cementsthem together in their tent-home, creating a sweet concord of hearts and hopes and joys; and then elevates them unitedly in fond anticipation of reunion in their eternal home.
When we are drawn to each other, it should be by a true cord, and by an influence which binds and cements for life.
Over this he cements a sheet of glass as thin as paper, so that he can look through this tiny window into the egg, and see the chick grow.
Now if a man is building a house out of bricks, he piles the bricks near where the house is going to be; and then he takes them, a few at a time, and cements them into his wall.
In various processes, cements of different descriptions are required for a variety of purposes.
Limes and cements are far too wide a subject to be dealt with as part of an evening's lecture on another topic, and no doubt they will hereafter form the subject of a lecture or lectures.
A good many cements made from natural stones used to be employed, such as Medina, Harwich, Atkinson's, or Roman cement.
At the end of twelve months, however, practically all the cements set in fresh water showed greater strength than those set in sea- water.
Cements from representative firms in different countries were obtained for use in making the blocks, which had coloured glass beads and coloured crushed glass incorporated to facilitate identification.
As little gypsum as possible should be added for regulating the time of setting to cements which are to be used in sea- water.
For leather, nothing less than 100 should be used, and special cements are better still.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cements" in a variety of sentences. We hope that you will now be able to make sentences using this word.
