RU1785573C - Method for water receptacles consumption determining - Google Patents

Abstract

Using the design of concrete compositions In construction and in non-enterprises: the construction industry Determine the density of water, cement and crushed stone. The normal density of the cement paste is tested. NTF Absolute volume. . The water requirements of sand and aggregate are determined by the formulas

Description

The invention relates to methods for determining the water demand of aggregates and can be used for the design of Concrete Compositions in construction and in the enterprise: construction industry

A known method for determining the water demand of aggregates by indirect indicators m and g fineness,

A disadvantage of the known method is the low accuracy of determining water demand, i.e. excluded form

The closest known t-application is the method for determining the need for aggregates, including determining the normal density of the cement paste, mixing cement with water corresponding to the normal density of the cement paste for 5 minutes, determining the control spread of yunus, cement cement of normal density on a standard shaking table, mixing cement with sand shutter

the resulting mixture with water until a cone spreading on the shaking table is equal to the control sprinkling of the yunus of the cement dough, determining the workability of the cement-mortar, selecting the water-cement ratio of the concrete mixture with workability. equal to the control workability of cement-sand mortar, calculation of water requirements of sand and coarse aggregate

The method has low accuracy, since the determination of the normal density of the cement paste, water consumption of fine and coarse aggregate is carried out with a varying absolute volume of mixtures for different aggregates, which leads to a decrease in the uniformity of concrete in the process of its manufacture.

The purpose of the invention is to increase the accuracy of determination of concrete compositions

The chain is achieved in that in a method for determining the water demand of aggregates, including the determination of normal

x eaten

Xi

s

with

cement dough mixes mixing cement with water corresponding to the normal density of the cement dough for 5 minutes, determining the control yunus test of cement paste and dough thickness on a standard shaking table, mixing the cement with sand, shutting the mixture with water until a spreading cone on the building total-ie, equal to the control spread of the cement cone cone, determination of workability of cement-sand mortar, selection of water-cement ratio of concrete mix with comfort | cladability equal to the maximum productivity, cement-sand of grout, calculation of water requirements of necia and coarse aggregate, determine the density of water, grains of cement, coarse and coarse aggregates and bulk density (rock aggregate, preparation of cement-sand mortar for different aggregates, a constant absolute volume of the mortar is equal to ntropic, the ratio of cement, nect a and i-aggregate aggregate is determined by non-DOP from the minimum water demand of the concrete mixture, when it is convenient || m equal to reference udobous padyveemosti cement-sand rastrora, a constant absolute volume of concrete mix, equal to the control, and water demand Cant and a large fill ratio of claims opredelpyut

Bn (W / c | p - | W / c | and 100 / P „Wc (W / u) b- (W / c | p-100 / Щ

where is the iodo-cement ratio of the absolute volume of water and cement of the cement-sand mortar with a control unpacking of yunus on a standard built-in stand,

(W / c | c - water-cement ratio by absolute volume of the guest of normal density,

П - РЗС ПД ПЕОА in additional absolute volume from cement consumption by absolute volume in a cement-sand rasgeore

(W / c | p is the water-cement ratio of concrete slab according to the absolute slump at a workability equal to the control cement-sand mortar;

Щ - crushed stone consumption in dolce of absolute volume from cement consumption in absorptive volume in concrete mix

The method is as follows

Determine the normal density of the cement tag: mix Cement with EUDA for 5 min. Determine the yuntrol test of the unouge cement paste of normal density on a standard shaking table, then mix the cement with sand and grind the resulting

the mixture with water until a spreading of the cone on the built-in stage is equal to the control spread of the tone of the cement paste.

The workability of the cement-sand pit is determined. The water-concrete ratio of the concrete mixture with the workability equal to the control fertilizer is selected || cement-sand mortar

water demand of sand and coarse aggregates

The density of BIRTH, grains of cement, small and coarse aggregates and the bulk density of coarse aggregate are determined

The preparation of a cement-sand mortar for a sample of substrates is carried out with a constant absolute volume of the solution equal to the control, and the ratio of cement, sand to large fill is determined by one of the minimum water requirements of the concrete mixture when it is easy to work. equal, ntropic readiness of cement-sand mortar, and constant absolute

volume of concrete mix equal to the control

The water demand of sand and coarse aggregate is determined from the ratio

Bp | B / c1p- | B / u | 1G-100P, Ps (W / c) b-1 B / c | p 100SC,

where (B / ujp is the ratio of the absolute water volume and the IPHTB of the cement-sand mortar in the case of the uncontrolled spraying of the cone on a standard built-in: -conciling CToniife,

 - water-cement ratio according to the absolute volume of the test of normal density.

P is the sand size in the absolute volume from the cement rate in the absolute volume E of the cement-sand mortar,

(, is the water-cement ratio of the concrete mixture by abgopnet volume with workability equal to the control cement-sand mortar,

Щ - crushed stone consumption and dol m - absolute volume from cement consumption by absolute volume in concrete mix

Formulation method The method for determining the water demand of aggregates is used. Determining the normal density of the cement dough. Mixing the cement with water. Corresponding to the normal density of the cement dough for 5 minutes. Determining the control dispersion of the cement density of the normal density test to standard shaking the table, mixing cement with sand, making the resulting water mixture until a cone is sprayed on the shaking table equal to the control test of the cement paste cone, the improvement of the workability of the cement-sand mortar, the selection of the water-cement ratio of the concrete mix with the workability equal to the control performance of the workability of the cement-sand mortar, the calculation of the water demand of sand and coarse aggregate, with the exception that with a chain for improving the accuracy of determining the composition of concrete., determine the density of water of the grains of cement, fine and coarse aggregates and the bulk density of coarse aggregate, the preparation of cement-sand mortar for different aggregates is carried out t at a constant absolute volume of the solution equal to 1 ntrol ratio of cement, sand and coarse aggregate Determine the outcome of the minimum water consumption of the concrete mixture when it is less wasteful, which is equal to the control workability rate sand mortar, constant absolute volume

the concrete mix is equal to the control, and the water demand of sand and aggregate is determined from the ratios Bn (B, C) P - (B / C) c 100 / P, Bsc () b - | B / U) p ШО / Щ,

where W / C) p is the water-cement ratio in terms of the absolute volume of water and cement of the cement-sand mortar with a control onus spread on a non standard shaking table,

(- water-cement ratio by the absolute volume of the test of normal density

P - races, od peo a, fractions of the absolute volume from p, ss.: Ode of cement in absolute

volume and in cement-sand mortar,

(W / C (and is the water-cement ratio of the concrete mix in absolute volume at a drop of net equal to the uncontrol of cement-sand mortar

Щ - crushed stone consumption in absolute volume from cement consumption in absolute volume in concrete mix.