CN100387965C

CN100387965C - Method for testing flexual property of warming plate made from extruded plastic foam of polystyrene

Info

Publication number: CN100387965C
Application number: CNB200510043267XA
Authority: CN
Inventors: 肖绪文; 谢刚奎; 王桂玲; 周洪涛; 万成梅
Original assignee: China Construction Eighth Engineering Division Co Ltd
Current assignee: China Construction Eighth Engineering Division Co Ltd
Priority date: 2005-04-25
Filing date: 2005-04-25
Publication date: 2008-05-14
Anticipated expiration: 2025-04-25
Also published as: CN1687738A

Abstract

The present invention discloses a method for testing the bending performance of a heat preservation plate of plastic extruding polystyrene foam plastic. A test sample is taken from environment that room temperature is from 10 DEG C to 30 DEG C and relative moisture is from 45% to 80%, and is measured, and a hydraulic pressure universal testing machine or a bending tester with a loaded pressing head and supporting seat are adopted. The minimal indicating value is 10N, precision is 1%, two supporting seats are arranged, and span length is 600mm +/-10mm; the test sample is placed on the two supporting seats, and the loaded pressing head is positioned in the center of the test sample, so that the height of the test sample is consistent with the direction of a load; the loaded pressing head comes into contact with the test sample with the minimum stress and records the position, the position is used as a zero position point of the deformation of the test sample, and the loaded pressing head exerts loads to the test sample at the rate of 10 mm/min +/-2 mm/min until the test sample is broken; a breaking load, bending stress, the damaged condition of the surface of the test sample, a testing result and an arithmetic average value are measured. The present invention causes an XPS heat preservation plate which accords with requirements to improve building quality for the application of a heat preservation system of buildings so as to reduce building costs. The present invention simplified construction and ensures the smoothness, etc. of wall surfaces easily.

Description

Method for testing flexual property of warming plate made from extruded plastic foam of polystyrene

Technical field

The present invention relates to product testing method for building, is a kind of method for testing flexual property of warming plate made from extruded plastic foam of polystyrene.

Background technology

The applicant has designed a whole set of building heat preservation system under construction, wherein adopt extrusion molding polystyrene polyfoam for heat insulation (being called for short XPS) to manufacture warming plate and template, owing in this building heat preservation system, heat insulation formwork is had higher requirement, particularly the performance of bending strength directly influences multiple indexs such as construction quality, so the selection to warming plate then seems extremely important, existing plate test method all can not detect the XPS warming plate, makes the application under construction of XPS warming plate be subjected to certain restriction.

Summary of the invention

The objective of the invention is, a kind of method for testing flexual property of warming plate made from extruded plastic foam of polystyrene is provided, it can solve the deficiency that prior art exists, make satisfactory XPS warming plate in the building heat preservation system is used, improve construction quality, and then reduction building cost, working procedure is simplified, and easily guaranteed degree of plainness for wall surface etc.

The present invention for achieving the above object, be achieved through the following technical solutions: method for testing flexual property of warming plate made from extruded plastic foam of polystyrene, 10 ℃-30 ℃ of room temperatures, materials in the environment of relative humidity 45%-80% to its measurement, adopt universal hydraulic testing machine or have the Apparatus for Bending at low-temp of loading pressure head and bearing, minimum indicating value is 10N, precision is 1%, two bearings are set, 600 ± 10 millimeters of the spans of two bearings, sample places on two bearings, the loading pressure head is positioned at the central authorities of sample, make the height of sample consistent with the loading direction, the loading pressure head contacts with sample with the stress of minimum, writes down this position and as the zero-bit point of sample deformation, the loading pressure head applies load with the speed of 10 ± 2mm/min to sample, till sample fracture, measure breaking load, the fracture bending stress, specimen surface damage situations, test findings and arithmetic mean.Materials when it is measured, measure its width and thickness, be accurate to 0.1mm, measure respectively on 3 points along the span center line and average at span centre.Technical specification and parameter are: maximum test force 300KN, measurement range and scale minimum scale value 0-30KN, 0-60KN, 0-150KN, 0-300KN, ultimate range comprises throw of poston 550mm between the stretching jaw, flat sample maximum grip width 70mm, flat sample holder thickness 0-15mm, round specimen clamping diameter phi 10-φ 32mm, between compressing surface apart from 0-300mm, on, lower platen size φ 120mm, apart from 100-1000mm, crooked was rolled width 140mm-200mm, allows flexibility 100mm between bending test was propped up and rolled, shear specimen finish φ 10mm, the effective spacing 590mm of stretching space two pillars, the effective spacing 380mm of compression stroke two tie-bars, the about 5mm-175mm/min of examination platform ascending velocity, the about 5mm-150mm/min of lower jaw rising or falling speed, oil pump motor power 1.5KW, lower jaw motor power (output) 0.6kw, testing machine physical dimension length * wide * height, main frame comprises piston range 1250 * 560 * 2987mm, dynamometer 1050 * 770 * 1778mm.

Test method of the present invention is applicable to determines the square-section insulation material XPS plate bending strength when horizontal loading puts on surperficial resistibility and material bending usually.Extrusion molding polystyrene polyfoam of the present invention is a Main Ingredients and Appearance with polystyrene resin or its multipolymer, adds a small amount of additive, makes the rigid foam with hole-closing structure by the heating extruding moulding.

Test method of the present invention has solved the XPS warming plate can do the root problem that template is used in the construction of building heat preservation system, it provides better quality assurance for the XPS warming plate in the building heat preservation construction, thereby building cost is reduced, working procedure is simplified, easier assurance wall leveling degree, various technical parameters have guaranteed that the XPS warming plate is as the various quality requirementss of template in the construction of building heat preservation system etc.

Description of drawings

Accompanying drawing 1 is a loading synoptic diagram of the present invention; Among the figure, the 1st, seaming chuck, arc diameter are 30 ± 1mm, the 2nd, the XPS warming plate, the 3rd, push-down head, arc diameter are 30 ± 1mm.

Embodiment

Test method of the present invention adopts universal hydraulic testing machine or has the Apparatus for Bending at low-temp of loading pressure head and bearing, and minimum indicating value is 10N, and precision is 1%.For avoiding sample to produce excessive impression, loading pressure head and bearing end face should be the column type surfaces, and arc diameter is 30 ± 1mm, and the length of cylinder should be no less than the width of sample at least, two bearing spans, 600 ± 10mm, and the loading pressure head is positioned at the central authorities of sample.The minimum indicating value of the vernier caliper that adopts is 0.01mm, each one of ruler 100cm and 30cm, minimum indicating value 1mm.Sample is a rectangular parallelepiped, length 700 ± 10mm, width 150 ± 1mm, thickness 40-60mm ± 1mm.Should not make the foam structure distortion of sample during sample preparation.Sample needs the two sides band epidermis, and the length of its sample is to should be along the length direction of sheet material when cutting out sample.Every kind of sample is tested 4 samples at least.Experimental enviroment is indoor temperature 10-30 ℃, relative humidity 45%-80%.

Carry out the dimensional measurement of test specimen before the test, measure its width and thickness, be accurate to 0.1mm at span centre.Preferably on three points, measure respectively, average, so that not exclusively on the beam limit can obtain accurate more numerical value when parallel along the span center line.Determine bearing and span length, actual span length and definite span length's error should three point measurement span lengths, be accurate to 1mm in 1%, carry out record.Sample is placed in the middle of the bearing, make the height of sample consistent with the loading direction, the loading pressure head contacts with sample with the stress of minimum, writes down this position and as the zero-bit point of sample deformation.The loading pressure head applies load with the speed of 10 ± 2mm/min to sample, till sample fracture.The disruptive force and the fracture mode of record sample are if fracture position, should write down the distance of fracture position apart from nearest strong point place at non-span centre.

Basic specification and parameter are as follows:

Maximum test force 300KN, measurement range and scale minimum scale value 0-30KN, 0-60KN, 0-150KN, 0-300KN, ultimate range comprises throw of poston 550mm between the stretching jaw, flat sample maximum grip width 70mm, flat sample holder thickness 0-15mm, round specimen clamping diameter phi 10-φ 32mm, between compressing surface apart from 0-300mm, on, lower platen size φ 120mm, apart from 100-1000mm, crooked was rolled width 140mm-200mm, allows flexibility 100mm between bending test was propped up and rolled, shear specimen finish φ 10mm, the effective spacing 590mm of stretching space two pillars, the effective spacing 380mm of compression stroke two tie-bars, the about 5mm-175mm/min of examination platform ascending velocity, the about 5mm-150mm/min of lower jaw rising or falling speed, oil pump motor power 1.5KW, lower jaw motor power (output) 0.6kw, testing machine physical dimension length * wide * height, main frame comprises piston range 1250 * 560 * 2987mm, dynamometer 1050 * 770 * 1778mm.

Claims

1. method for testing flexual property of warming plate made from extruded plastic foam of polystyrene, it is characterized in that: 10 ℃-30 ℃ of room temperatures, materials in the environment of relative humidity 45%-80% to its measurement, adopt universal hydraulic testing machine or have the Apparatus for Bending at low-temp of loading pressure head and bearing, minimum indicating value is 10N, precision is 1%, two bearings are set, 600 ± 10 millimeters of the spans of two bearings, sample places on two bearings, and the loading pressure head is positioned at the central authorities of sample, makes the height of sample consistent with the loading direction, the loading pressure head contacts with sample with the stress of minimum, write down this position and as the zero-bit point of sample deformation, the loading pressure head applies load with the speed of 10 ± 2mm/min to sample, till sample fracture, measure breaking load, the fracture bending stress, specimen surface damage situations, test findings and arithmetic mean.

2. method for testing flexual property of warming plate made from extruded plastic foam of polystyrene according to claim 1, it is characterized in that: materials when it is measured, measure its width and thickness at span centre, be accurate to 0.1mm, measure respectively on 3 points along the span center line and average.