五强两比复习资料Fivestrongtworatioreviewmaterial

1、五强两比复习资料（five strong two ratio review material）physical and mechanical properties of cementone, six big general cement1, portland cement: p.i (without mixing material) p.ii (mixed with 05% material)2, ordinary portland cement: p.o (mixed with 6%15% material)3, slag portland cement: p.s (20%70% granu

2、lated blast furnace slag)4, pozzolanic portland cement: p.p (mixed with 20%50% pozzolanic admixture)5, fly ash portland cement: p.f (20%40% fly ash)6, composite portland cement: p.c (mixed with 15%50% material)two, cement soft routine items: standard consistency, water consumption, fineness, stabili

3、ty, setting time, sand strengththree. determination of rejects and rejects:waste: mgo, so3, initial setting time, stability, any one does not meet the requirements, are waste productsunqualified products: fineness, final setting time, admixture content exceeding standard, strength is not enough, pac

4、king mark is unqualified, p.i, p.ii, p.o also include insoluble matter and loss of ignition, any of which is unqualified.four, test temperature and humidity: (20 + 2) relative humidity is greater than or equal to 50% deg c during the work every day at least oncetemperature and humidity curing box: (

5、20 + 1) = 95% deg relative humidity recorded every 4 hours, automatic control records two times a day.standard curing room temperature 20+2, relative humidity 95% or 20+2, non flow ca (oh) 2 saturated solutioncuring tank temperature: (20 + 1) deg, once every other day. each curing pool only maintain

6、s the same type of cement test piece. it is not allowed to change water during the maintenance period, and the distance from the surface of the water is not less than 5mmfive, fineness: ft= (rt/w) x100 (%) correction factor: c=fs/ft1, fineness should do two parallel tests, two to 0.5% fineness diffe

7、rence amounting to 5%, two to 1% poor fineness of >5%, exceeding tolerance for third trials, with no more than two times the average test error.2, sieve use 10 times, use special cleaning liquid cleaning, use 100 times should be calibrated. the correction of the sieve should be done in two parall

8、el tests, and the results can be used within 0.80-1.20.3, portland cement fineness to specific surface area, specific surface area >300m2/kg; ordinary cement to 80um square hole sieve more than that, screening shall not exceed 10%4, negative pressure sieve method (standard method) balance weighin

9、g 100g, graduation value is not greater than 0.01g, negative pressure range 40006000pa,sample 25g or 10g5, the test methods are: negative pressure sieve method, water sieve method, manual sieve method, arbitration test to negative pressure screening method shall prevail.six, the setting time: a mini

10、mum scale 0.1ml, accuracy of 1%.initial setting: six kinds of cement can not be earlier than 45min,determination of initial setting time: from bottom plate (4 + 1) mm;final setting: portland cement shall not be later than 6.5h, and other shall not later than 10h.final setting time determination: 0.5

11、mm no trace, near the initial coagulation once every 5min, near the final condensate every 15minmeasure once.seven, stability:boiling time: 30min + 5min, constant boiling time: 180min + 5min- clip method (standard method) qualification: (c-a) the average value is less than 5mm (c-a), the difference

12、is more than 4mmshould be redone, then again, that stability is not qualified.test cake method: qualification: no bending, crackseight. water consumption of standard consistency:test rod method (standard method) test cone method (substituting), test rod sink into the water separation floor (6 + 1) m

13、m cement paste water consumption.nine. strength of mortar:cement 450 + 2g standard sand, 1350 + 5g water, 225 + 1g; 1 pieces of cement, 3 parts of sand, 0.5 parts of water, water cement ratio0.5 (cement water ratio was 0.5), the test: first water cement, mixing 30s, second 30s before adding sand, ta

14、p 2 times feeding, each vibration 60 times, volcano ash cement water in addition to meet w/c =0.5, but also should satisfy the flow of more than 180mm, according to the 0.01 integer times of adjustment.ten, bending strength: rf=1.5ffl/b3, b=40mm, l=100mm (press three blocks average, ultra + 10%, eli

15、minate again average)charge velocity (50 + 10) n/scompressive strength: rc=fc/a (mpa) accurate to 0.1mpa loading speed (2400 + 200) n/s (press six flat)the test data of the test group is invalid when the average value of the block is 1 or 5, and the average value of the five blocks exceeds 10%.break

16、ing time: from water mixing, counting, minutes to record, breaking type should be recorded to minutes (breaking time: 24h + 15min, 48h + 30min, 72h + 15min, 7d + 2h, 28d + 8h)planetary cross mixer, check the time between the mixer blades and the bottom of the pot every month (3 + 1) mmeleven all tri

17、al arbitration shall be based on the standardtwo strength two ratio designa sand, clay content, clay content, clod contentthe mud content (<0.08mm sieve) and clay (>1.25mm sieve) flakiness content (%)(%) (%)the stone is larger than c30 = 1 = 0.5 = 15<c30 = 2 = 0.7 = 25the sand was c30 = 3 =

18、 1<c30 = 5 = 2two, sand acceptance batch:1, large transport: every 600t, 400m32, small transport: 300t per 200, m33, quality stability can be checked regularlythree, the conventional test items: gravel particle size distribution, fineness modulus, clay content, clay content, sand detection of chl

19、oride ion content (rc = 0.06%, prestressed concrete is less than or equal to 0.02%).according to the 0.630mm sieve, the accumulated sieve margin is divided into three grading areas, i. i. 85%71%; zone ii; 70%41%; section 3; 40%16%. sand by fineness modulus uf=(beta 2+ beta, 3+ beta, 4+ beta, 5+ beta

20、 6), -5 beta, 1/100- beta 1,coarse sand: uf =3.73.1; medium sand: uf =3.02.3; fine sand: uf =2.21.6.grade four, fly ash: an ash used in prestressed reinforced concrete and reinforced concrete span is less than 6.0m; two ash for concrete and reinforced concrete; three ash concrete for less than c30.f

21、ive, concrete curing: operating room temperature: (20 + 5) c; curing temperature and humidity (20 + 2) = 95% deg c, or in (20 + 2) ca saturated c does not flow (oh) 2 saturated solution.six, mortar: cement mortar curing: (20 + 3) c > 90%; mixed mortar: (20 + 3) c, 60%80%.the interval is not less

22、than 10mm.seven, concrete mixing properties:1, consistency: indicated by the slump, accurate to 1mm, the slump is 10mm: dry concrete; 1090mm: plastic concrete;the fluidity of 100150mm: concrete; high fluidity concrete is more than 160mm:, more than 220mm to do the slump test, using the ruler measuri

23、ng the maximum and minimum diameter, with the mean value of said, such as two with a diameter of less than 50mm, the test is invalid. the slump is 10mm need to do vebe consistency test.2, density: 20002800kg/m3, <2000 kg/m3 called lightweight concrete (with lightweight aggregate configuration, su

24、ch as ceramsite, cinder, peng zhangzhenbead rock) >2000 kg/m3 weighing concrete.3, weighing accuracy: cement, fly ash, admixture: + 0.5%; gravel, gravel and other coarse aggregate: + 1%.4, the slump of >70mm: manual vibrating mechanical vibration is less than or equal to 70mm.eight, special co

25、ncrete:1, high strength concrete cement dosage: mc less than 550 kg/m3, cementitious materials content less than 600 kg/m3 mc+f;2, impermeability of concrete: cement sand ratio mc = 320 kg/m3, p 3:35%45%;3, the amount of cement concrete pump: mc = 300 kg/m3, water cement ratio is less than 0.60 w/c4

26、, reinforced concrete in normal and dry environment: w/c = 0.65, mc = 260, kg/m3;5, under the moist environment (no damage): w/c = 0.60, mc = 280, kg/m3nine, mortar mixing properties:1, consistency: with test cone subsidence depth, accurate to 1mm. the difference between the two test values, such as

27、 greater than 20mm, is re stirreddetermination。 tamping rod diameter 10mm, length 350mm, end grinding circle.2, the degree of stratification of mortar mixture stability, not more than 30mm, take two times the average value, two value difference over 20mmredo;3, mixing time: cement mortar and mix mor

28、tar may not be less than 120s; fly ash and admixture mortar shall not be less than 180s.test block strength:i. sampling of concrete:1, on-site sampling frequency for the same concrete mix, each 100 or each 100m3, each work team at least once; engineering units, each project acceptance, each floor, a

29、t least once.2, ready mixed concrete sampling: take in the same car, in the amount of discharge between 1/43/4 take, each sample quantity should meet the test items required quantity of 1.5 times, and should not be less than 20l.3, test block should be with mold, surface covering film maintenance fo

30、r one to two days and nights.two 、 allowable size deviation of concrete test block and test block:1, test mode: regular three months from school once, internal size deviation: not greater than the nominal size of + 0.2%, adjacent surface clampangle 90 + 0.3 degrees; test internal surface roughness:

31、every 100mm is not greater than 0.04mm.2, block: bearing surface flatness tolerance is less than or equal to 0.0005d (d side). the angle of the adjacent faces is 90 + 0.5 degrees, each side length,the tolerance of diameter and height shall not be greater than 1mm.three, test block making:1, accordin

32、g to the concrete thickness determine the molding method, the slump is less than 70mm with mechanical vibration;2, slump of >70mm with artificial ramming: concrete is divided into two layers, each layer into the mold, filling thickness of roughly equal, pound should be according to the direction

33、of spiral from the edge to the center, vibrating bottom concrete, rod reaches the bottom mold, the upper vibrating rod should be run through the upper lower insertion 2030mm. the number of tamping 10000mm2 on each floor shall not be less than 12 times (150mm * 150mm test block, 27 times per layer).3

34、, mortar test block: 70.7mm * 70.7mm * 70.7mm; measured size and nominal size of not more than 1mm, can be calculated according to nominal size. application of mortar bottom mold, common clay brick rate greater than 10% with the water content below 20%, the water bottom brick.four 、 loading speed of

35、 test block:1, concrete test block: press measuring accuracy + 1%, the damage load should be in the range of 20%80%strength test of concrete block, compression test, bending test<c30 0.30.5mpa/s 0.020.05 mpa/s<c60 0.50.8mpa/s 0.050.08 mpa/s more than c30.c60 0.81.0mpa/s 0.080.10 mpa/s2, mortar

36、 block: 0.5kn/s >m5.0: = m5.0: 1.5 kn/sthe measuring accuracy of the press is + 2%. there should be a load speed indicating device and a loading speed control device, and the failure load should be within the range of 20%80%.five, concrete cube compressive strength:1, calculation formula: fce=f/a

37、, the calculation results accurate to 0.1mpa;2, three specimens of the arithmetic mean as the specimens of intensity values (accurate to 0.1mpa), three measurements in the maximum or minimum value if there is a middle value difference is more than 15% of the median, the median value as the compressi

38、ve strength of the specimens of value, if the maximum and minimum value difference and intermediate values are more than 15% of the median, the test result is invalid.3, <c60 of concrete, non-standard test piece strength value should be multiplied by the size conversion factor, the value of:200mm

39、 * 200mm * 200mm test piece: 1.05; 100mm * 100mm * 100mm test piece: 0.95;more than c60 concrete should adopt the standard specimen, the use of non standard specimen, determine the test size conversion coefficient should be.six, mortar test block1, sampling: every floor or every 250m3 masonry, each

40、grade, each mixer take a group, ground (floor) surface 1000m2 no less than 1 groups.2, the compressive strength of the specimens of intensity values of six specimens of the arithmetic average (accurate to 0.1mpa), the maximum or minimum value and the difference of average value exceeds the average v

41、alue of 20%, while excluding the maximum and minimum values, the remaining 4 specimens as the arithmetic mean group of specimen strength value (accurate to 0.1mpa).seven 、 acceptance batch qualification:1, acceptance batch structure: should be the same strength, grade, age and the same process condi

42、tions and the same proportion of concrete composition.2 、 inspection and evaluation of concrete strength:statistical method evaluation (more than 10 groups):the sigma known: mfcu > fcu, k+0.7 a o, fcu, min fcu, k-0.7 o;<c20:fcu, min = 0.85, fcu, k; >c20:fcu, min = 0.90, fcu, kthe sigma is u

43、nknown, mfcu = 0.9fcu, fcumin = k + 1sfcu lambda, lambda 2fcu, k.* when sfcu is less than 0.06 fcu, k, take fcu, k = 0.06fcu, knon statistical evaluation method (group 10 below): the <10 group specimen consisting of a batch acceptance, its strength should also meet the following formula: mfcu = 1

44、.15fcu, k fcu, min = 0.95fcu, k.3, inspection and assessment of the strength of mortar: acceptance of each test block group average strength is not less than the design strength: mfm = fm, k; any single group of test block strength is not less than 0.75 of design strength: fm, min = 0.75fm, keight.

45、same condition maintenance:1, the equivalent age: daily average temperature reached 600 degrees daily,.d, the corresponding age, 0 years of age below the age of not included, should not be less than 14d, should not be greater than 60d.2, the number of sampling: the same strength level of the same co

46、ndition maintenance specimens should not be less than 10 groups, and should not be less than 3 groups.3, maintenance conditions: specimens should be close to the appropriate parts of the structure or structure of the appropriate location, and should take the same conservation methods.mechanical prop

47、erties of steel bars:concepts and definitions:original gauge distance: the gauge distance of the sample before applying forcelower yield strength: the minimum stress in the yield period, irrespective of the initial transient effect.elongation: after standard residual elongation distance (l0-ln) and

48、original gauge (l0) percentage ratio.two, common reinforcement mechanical properties, process performance indicators:rel (mpa) rm (mpa) a (%) bending core diameter (mm) bending angle sampling quantity (root) acceptance lothrb335 335490 3a 4a, delta 5=16 (diameter = 28) 180 2 pull 2 bend 60tr235 2353

49、70, delta, 5=25, a, 180, 2, pull, 2 bend, 60tq235 235410, delta, 10=23, 0.5a, 180, 1, pull, 2 bend, 60tcrb550 550, delta, 10=8, sub 3a, 180, 1, pull, 2 bend, 60tthree sample length:cold bending test l:l=0.5a pi (d+a) +140 (mm)support roll spacing: l= (d+3a) + 0.5a (mm);test length of welded joint of

50、 steel bar: l= (d+2.5a) +150 (mm) d+2.5a, inside distance of supporting rollerd is the diameter of the bent core; a is the diameter of the steel bar; the value of pi is 3.1.four, steel lap length:a: one side welding steel is larger than 8d, more than double welding 4d;level two: one side welding ste

51、el is larger than 10d, more than double welding 5d test at room temperature 10 to 35 deg cfive, the tensile test result is invalid judgment:1, the sample is broken in the gauge or mechanical characterizations of the gauge mark, and the elongation is less than the specified minimum value.2, equipment

52、 failure during the test, affecting the test results.six 、 direct measurement and shift method1, steel tensile test, tensile to gauge the nearest endpoint distance >1/3l0, after using direct measurement measuring gauge.2, to the nearest snap gauge from the endpoint of less than 1/3l0, after a shi

53、ft method measuring gauge.3, the measurement accuracy of measuring distance should be better than 0.1mm, accurate to + 0.25mmsix, welding sampling frequency:on the same day, completed by the same welder 300 grades, with the same diameter of welded steel joints should be as a group. when the number o

54、f the same number of welding joint less, can be accumulated in the same week. when there are still less than 300 connections, one batch shall be counted.nine. determination of tensile test results of welded joints (flash butt welding, arc welding, electroslag pressure welding, pneumatic welding):1,

55、qualified: 3 steel joints, tensile strength of specimens shall not be less than the tensile strength specified by this brand steel bar, at leastthere are 2 specimens broken apart from the weld and should be ductile fracture.2, unqualified: 2 specimens tensile strength is less than the tensile streng

56、th stipulated by the steel bar, or 3 specimens are in the weld or heat affectedbrittle fracture occurred in the area.3 、 retest: the tensile strength of 1 specimens is less than the specified value, or 2 specimens are brittle fracture in the weld or heat affected zone,its tensile strength is less th

57、an 1.10 times the tensile strength specified by the steel bar. the reinspection, cut into 6 specimens, while still having tensile strength of 1 specimens is less than the specified value, or 3 specimen fracture in the weld or the heat affected zone, brittle fracture, the tensile strength is less than 1.10 times the tensile strength of the reinforced provisions when. the batch shall be disqualified.ten 、 bend test of welding head (flash butt welding, air pressure welding)1, qualifi