CN1215321C - Fast strength test method of cementing material for PHC tube pile - Google Patents

Abstract

The present invention belongs to the field of measuring and testing, particularly to a method for fast testing the intensity of the gelled material of a PHC pipe pile. A test component is prepared from 20% of cement, 8.6% of ground admixtures, 71.4% of standard sand and mixing water as the rest which are stirred sufficiently and uniformly, and then, a test die is placed in a maintenance box so as to be maintained for 21 to 27 hours; the temperature of the maintenance box is controlled at 17 to 23 DEG C, relative moisture is larger than 90%, and after being maintained for 21 to 27 hours in the maintenance box, the test die is taken out to be demoulded, and demoulded test component is placed in a steam pressurizing pot for steam pressurizing and maintenance; time for rising temperature and pressure of the steam pressurizing pot is 2.5 hours, constant temperature is from 170 to 190 DEG C, constant pressure is maintained at 0.9 to 1.1MPa, and the time is 4 hours; then, the test component is cooled and decompressed for 1.5 hours, and the test component is taken out from the steam pressurizing pot so as to carry out a compressive strength test. The present invention can test the intensity of the gelled material of the PHC pipe pile fast and is favorable for the production and the use of the gelled material. The present invention satisfies the requirements of the gelled material of the PHC pipe pile for quality control.

Description

The method of inspection of PHC pile tube Binder Materials intensity

Technical field

The method of inspection of PHC pile tube Binder Materials intensity of the present invention belongs to measurement, field tests, particularly a kind of method for quickly detecting of PHC pile tube Binder Materials intensity.

Background technology

The quick test of the primary raw material in the PHC pile tube (prestressed high strength concrete pile tube)---Binder Materials intensity can't (ZBQ11004-86) be carried out with industry standard " strength of cement method for quickly detecting ", owing in PHC pile tube Binder Materials, contain levigate silica sand or levigate building sand about 30%, they just produce activity in the time of 140 ℃, adopt " strength of cement method for quickly detecting " can not correctly reflect the intensity of PHC pile tube Binder Materials, be unfavorable for the production and the use of Binder Materials, influential to the quality quality of PHC pile tube.

The objective of the invention is to avoid weak point of the prior art, and a kind of intensity that can check PHC pile tube Binder Materials apace is provided, help the method for inspection of the PHC pile tube Binder Materials intensity of the production of Binder Materials and use.

Summary of the invention

The objective of the invention is to reach by following measure, the amount (percentage by weight) of each composition of test specimen that is adopted is: cement 20%, levigate admixture 8.6%, normal sand 71.4%, require cement to sieve with the square hole screen of 0.9mm, levigate admixture sieves with the square hole screen of 0.9mm, normal sand meets the quality requirements of GB178-77 " Standard sand for cement strength test ", with cement, and levigate admixture, normal sand, add mixing water, after stirring, put into die trial and wipe off, die trial was put into the curing box maintenance 21-27 hour, the curing box temperature is controlled at 17-23 ℃, and relative humidity with die trial is taken out the demoulding after maintenance 21-27 hour greater than 90% in the curing box, test specimen after the demoulding is put into the still kettle steam press maintenance, and the increasing temperature and pressure time of still kettle is 2.5 hours; Constant temperature is at 170-190 ℃ of degree, keeping constant voltage pressure is 0.9-1.1Mpa, long 4 hours of time, decrease temperature and pressure is 1.5 hours then, maintenance finishes in still kettle, takes out test specimen and carry out compressive strength test from still kettle, and compressive strength test is carried out according to the regulation of GB177-85, adopt the resistance to compression anchor clamps, the loading speed of pressing machine is controlled in the scope of 5000 ± 500N/s.

28 days compressive strength of PHC pile tube Binder Materials is calculated as follows:

R28＝A*Rk+B

In the formula, the compressive strength of the PHC pile tube Binder Materials 28d of R28---prediction, the Mpa of unit

Rk---with the PHC pile tube Binder Materials compressive strength that this detection method is measured, the Mpa of unit

The constant that A, B----are undetermined

A, B undetermined constant value are determined by following formula:

$A=[\underset{i=1}{\overset{n}{\mathrm{\Σ}}}R28i*\mathrm{Rki}-\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}R28i\right)\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{Rki}\right)/n]/[\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{Rki}*\mathrm{Rki}-\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{Rki}\right)*($

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{Rki})/n]$

$B=\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}R28i\right)/n-A\left(\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{Rki}\right)/n$

R28i in the formula---i cement sample 28d compressive strength determination value (not adding admixture), the Mpa of unit;

Rki---i PHC pile tube Binder Materials sample strength detection value (adding admixture), the Mpa of unit;

N---test number (TN) is no less than 30 times.

The following formula of definite usefulness of PHC pile tube Binder Materials check strength control value calculates:

[Rk]＝(RC-B)/A

In the formula, RC---cement mark, Mpa;

[Rk]---PHC pile tube Binder Materials check strength control value, Mpa;

A, B----constant.

As Rk 〉=[Rk], judge that PHC pile tube Binder Materials compressive strength is qualified; As Rk＜[Rk], judge that PHC pile tube Binder Materials compressive strength is defective.

The amount (percentage by weight) of each composition of test specimen that is adopted is formed also can adopt cement 12-31.5%, and levigate admixture 3.5-12% is in the scope of normal sand 65-76%.

The present invention can the fast intensity of checking PHC pile tube Binder Materials apace, helps the production and the use of Binder Materials, satisfies the needs of PHC pile tube Binder Materials quality control.

Embodiment

Three test specimens of moulding need the material of weighing: cement 378g, levigate admixture 162g, normal sand 1350g, water 238g.According to the regulation of GB177-85, cement, levigate admixture, normal sand are poured in the agitated kettle, start stirring machine, mix and stir water filling slowly after 5 seconds, mixing time is 3 minutes.Reaching die trial down, funnel is clamped on the vibration table surface center, packing into the material for test that stirs down, funnel flows in the die trial, the blanking time is controlled at 20-40 in second, vibrates parking in 120 seconds, takes off die trial, floating with flexible spatulas, die trial was put into the curing box maintenance 24 hours, and the curing box temperature is controlled at 20 ℃, and relative humidity is greater than 90%, maintenance was taken out the demoulding with die trial after 24 hours in the curing box, and the test specimen after the demoulding is put into the still kettle steam press maintenance.The increasing temperature and pressure time of still kettle is 2.5 hours; Constant temperature is at 170-190 ℃ of degree, and keeping constant voltage pressure is 0.9-1.1Mpa, and long 4 hours of time, decrease temperature and pressure is 1.5 hours then, and maintenance finishes in still kettle, takes out from still kettle and carries out compressive strength test.Compressive strength test is carried out according to the regulation of GB177-85, adopts the resistance to compression anchor clamps, and the loading speed of pressing machine is controlled in the scope of 5000 ± 500N/s.

Claims (2)

1, a kind of method of inspection of PHC pile tube Binder Materials intensity, the amount that it is characterized in that each composition of test specimen of being adopted is: cement 12-31.5%, levigate admixture 3.5-12%, normal sand 65-76%, cement sieves with the square hole screen of 0.9mm, levigate admixture sieves with the square hole screen of 0.9mm, add mixing water, after stirring, put into die trial and wipe off, die trial was put into the curing box maintenance 21-27 hour, the curing box temperature is controlled at 17-23 ℃, and relative humidity with die trial is taken out the demoulding after maintenance 21-27 hour greater than 90% in the curing box, test specimen after the demoulding is put into the still kettle steam press maintenance, and the increasing temperature and pressure time of still kettle is 2.5 hours; Constant temperature is at 170-190 ℃ of degree, keeping constant voltage pressure is 0.9-1.1Mpa, long 4 hours of time, decrease temperature and pressure is 1.5 hours then, from still kettle, take out and carry out compressive strength test, compressive strength test is carried out according to the regulation of GB177-85, and 28 days 28d compressive strength of PHC pile tube Binder Materials is calculated as follows:

R28＝A*Rk+B

In the formula, R28---the compressive strength of prediction PHC pile tube Binder Materials 28d, the Mpa of unit;

Rk---with the PHC pile tube Binder Materials compressive strength that this detection method is measured, the Mpa of unit;

The constant that A, B----are undetermined,

The following formula of definite usefulness of PHC pile tube Binder Materials check strength control value calculates,

[Rk]＝(RC-B)/A

In the formula, RC---cement mark,

[Rk]---PHC pile tube Binder Materials check strength control value,

A, B---constant.

2, the method of inspection of PHC pile tube Binder Materials intensity according to claim 1, the amount that it is characterized in that each composition of test specimen of being adopted is: cement 20%, levigate admixture 8.6%, normal sand 71.4%, cement sieves with the square hole screen of 0.9mm, levigate admixture sieves with the square hole screen of 0.9mm, add mixing water, after stirring, put into die trial and wipe off, die trial was put into the curing box maintenance 21-27 hour, the curing box temperature is controlled at 17-23 ℃, and relative humidity with die trial is taken out the demoulding after maintenance 21-27 hour greater than 90% in the curing box, test specimen after the demoulding is put into the still kettle steam press maintenance, and the increasing temperature and pressure time of still kettle is 2.5 hours; Constant temperature is at 170-190 ℃ of degree, and keeping constant voltage pressure is 0.9-1.1Mpa, and long 4 hours of time, decrease temperature and pressure is 1.5 hours then, takes out from still kettle and carries out compressive strength test, and compressive strength test is carried out according to the regulation of GB177-85.