Yuav ua li cas RDP pab tiv thaiv kev nqus qhov rai nyob rau hauv chav sib sau

Paub txog kab ntsug rau hauv cement-based joint fillers

Yog vim dab tsi ces muaj kab ntsug rau hauv concrete thiab mortars?

Thaum cov khoom siv hluas tshuab tso kom sov ntawm 15 thiab 20 feem pua hli nyob rau hauv qhov kev sib thooj sib xwm thiab thaum lawm ntev, cov kab ntsug yuav tsim. Kev txheeb pom uas tau tso pub tseg los ntawm National Ready Mixed Concrete Association xyoo 2023 sau tias muaj ib yam dab neeg tshwm sim: tseem ceeb li 75 feem pua hli ntawm qhov tsis raug xyuas rau lub sijhawm dhau los ntawm kev sib tso tshuab tso kom sov tsis tu ncua. Muaj ntau yam cuab yeej tshwm sim qhov teeb meem no. Thaum kawg, cov kab ntsug me me muaj cheeb tsheb ntau dua rau hauv tus leej li cas, yog li ntawd tshuab yuav poob mus ntau heev. Tom qab ntawd yog qhov tshuab ntau npaum li cas. Cov siv tshuab uas muaj tshuab ntau dua 0.45 feem rau hauv hluas tshuab yuav tsim kev nyuaj siab hauv nws thaum nws ua tiav. Thiab tsi txhob saib tsis meej txog qhov chaw nres tseg tseem ceeb. Thaum cov chaw nres tseg tsis sib phim nyob rau hauv, qhov tshuab tso kom sov yuav tso kom sov ntau dua 30 thiab 40 feem pua hli dua li peb pom nyob rau hauv cov siv tshuab zoo tshaj.

Cov Ncauj Lus ntawm Tshuab Poob thiab Tus Nhiab Txias Hnub Hli rau hauv Qhov Tso Kom Sov

Txoj kev sib txuas tsis dhau 0.5 kg/m²/hour nyog hauv 72 teev thib ob, qhov sib txuas tseem ceeb no, yuav cuam tshuam siab dua li plaub zaug. Txoj kev sib txuas kheej kheej uas dhau 15°C hauv 24 teev yuav tso kom meej meej dua los ntawm kev sib txuas kheej kheej: cov kab ntsa yog 0.01% saum 10°C thaum cov sab nraud zoo tsha tsha, tsim kev sib tshuam uas ploj mus rau kev ploj.

Qhov tsis raug tshwm sim los ntawm kev tsim kho tsis raug thiab kev sib txuas

Kev Paub Txog Concrete (2022) tseg tias 62% ntawm cov kev ploj uas muaj feem cuam rau kev sib txuas muaj feem cuam rau:

Kev nthuav tawm ua ntej ua kev txiav txim siab ua ntej 7 hnub tuaj yeem tshwm sim rau 38% ntawm cov khaum hauv pem teb.

Txhawm nrhiav cov zej zog uas tshwm sim khaum los ntawm kev lag luam hauv qhov chaw muab tso

Soom xyuas cov lus nug no hauv 28 hnub thib ob:

1. Cov khaum me me (0.1–0.3 mm dav) uas tshwm tawm ntawm qhov chaw muab tso
2. Kev hlo li cas thiab tsis zoo sib xws, txhooj mus rau kev faus tsis zoo ntawm dej
3. Kev hla tshaj tawm ntau tshaj li kev kho los ntawm qhov cim (>125% qhov ntev dhau los)
4. Kev muab tawm ncig sib txawv (>3 mm kab siab tshaj tawm hauv 1m) nyob rau sab nraud ntawm slab

Kev pom tshwm sim ua ntej tuaj yeem pab tau rau kev kho los ntawm kev sau ntxiv epoxy, txhawj xeeb kom tsis txhob kho dua tag nrho lub joint nyiaj 89% thaum (Concrete Repair Institute, 2021).

Dab tsi yog Pawg Txheej Xwm Kawg RDP Nyob Rau Saum Qhov Chaw Ntawv Tsis Muaj

Yuav Ua Li Cas Polymer Dispersions Thay Tsawv Lub Chaw Sib Txuas

Thaum muab sib ntxig rau hauv cov khoom siv los pab tshuab ntawm cement, Redispersible Polymer Powder tsim tau cov roj polymer nyob hauv qhov chaw uas muaj zog. Cov roj no txhais tes ua li cas yog ib txoj kev xaiv cov kab ntsug ntub uas tsim thaum cov khoom hluv hluv hauv khib, thiab faib tawm qhov siab tshaj plua plav mus rau hauv cov polymer thiab cement thiaj li tsis pub tso tawm qhov siab tshaj plua plav rau hauv qhov chaw tseem ceeb. Cov kev sim uas tau muab them rau hauv lub tsev sim kom pom tias cov mortar uas muaj RDP tuaj yeem tiv thaiv qhov siab tshaj plua plav dua li 30% dhaws li cov khoom siv tsis muaj RDP. Qhov no txhais tau tias cov joint uas tsim los ntawm cov khoom no tuaj yeem tiv thaiv kev hla hauv hla ntawm kev hlawv thiab tsis hlo plam, uas tsim qhov yooj yim loj rau lub sijhawm nyob ntawm cov khoom no ua tus nqi kho.

RDP's kev tswj hwm rau Pore Structure thiab kev tiv thaiv dej

Kev sim ua kev siv qhov muag hla tshuab tau qhia tias cov duab nram no txhaws qhov muag hla tawm los ntawm li cas li 45%. Qhov no txhais li cas nyob hauv kev paub? Vim tias thaum muaj qhov muag hla tsawg dua, tus dej tsis tshav tawm ntau lawm hauv qhov chaw kho. Qhov no txhais tau tias lub concrete tuaj yeem nyob ruaj khov dua rau ntau xyoob, txhim kho qhov uas peb hu ua qhov sib txig sib luag tshiab tshiab los ntawm li cas li peb hnub mus rau tag li tsis pub ntev li hnub tsib hauv kev cai tshwj xeeb. Lub sijhawm ntxiv no pab rau dej kom raug sib ntxiv zoo dua nrog cov duab ntawm cement, tsim ib qhov chaw ruaj ntau ntawm calcium silicate hydrate gels. Txog tam sim no, kev kho tshuab tau tshwm sim hauv International Cement Review xyoo ntawm, qhov no tsim qhov chaw tshav tawm tsawg dua tshwj tsis pub ntev li 22% mus rau 28%.

Txhaws Kev Ruaj Khov Nyob Rau Hauv RDP-Modified Mortars Under ASTM Testing

Kev them ntsuas ASTM C157/C157M pom tseem ceeb tau muab RDP-enhanced mortars txo li 60–80% qhov tsis muaj kev pom tseem ceeb tom qab 90 lub hlis pom tseem ceeb. Kev sim nyob rau hauv kev sib txawv ntawm teb nthab (−5°C mus rau 40°C) sau tau RDP tus cwj pwm nyob rau hauv kev tiv thaiv kev sib txuam dua li 500 teb nthab—nyob rau sab thiaj li 3 dua li SRAs tsuas.

Daim ntawv qhia RDP Dosage rau Shrinkage Reduction Thauv Plaws

Daim ntawv qhia ntawm 2.5–3.5% RDP los ntawm siment muaj feem ntau tuaj yeem muab kev kho kom zoo tshaj plaws rau kev txhim kho tseem ceeb nyob rau hauv yam joint fillers, tab sis kev sib txawv ntawm kev sib txawv yog xav tau kev hloov pauv:

• Zoo sib txawv ntawm dej sov thiab dej npuag : 3% RDP nrog cov chaw nres dej nres
• Sib txuam ntau tshaj : 4% RDP ntxiv nrog cellulose ethers rau kev pab txhim kho kev ua haujlwm zoo dua

Txog 5% RDP tuaj yeem txo kev nyhuv siab los li 12–15%, xav tau kev raug zoo tshaj plaws ntawm kev ua haujlwm zoo thiab kev ua haujlwm.

RDP vs. Cov Ntaub NTawv Txhim Kho Pom Tseem Ceeb (SRAs): Tus Cwj Pwm Thiab Qhov Sim

Tus cwj pwm ntawm SRAs nyob rau hauv kev txhim kho pom tseem ceeb

Cov khoom siv txhawb kom hla tawm ntawm kev lag luam (SRAs) tuaj yeem txo kev lag luam los ntawm kev ntxuav qhov chaw nyob ntawm dej hauv cov khoom siv tsheb, yog li ntawd tuaj yeem txo kev puag ncig siab. Kev test tau pib ntxiv rau SRAs tuaj yeem txo qhov kev lag luam tsis muaj kev xwm txheej los ntawm 25% thiab txo qhov kev lag luam muaj kev xwm txheej los ntawm 50% hauv concrete siv zoo. Tab sis, lawv tus cwj pwm nyob ntawm kev sib hloov ntawm dej thiab cov khoom siv.

Qhov yooj yim ntawm SRAs hauv kev siv rau lub chaw ntxig

Thaum SRA muaj qee yam kev phom tshua zoo, lawv feem ntau ua rau muaj kev pheej hmoo nyob rau hauv qhov chaw sib xyaw. Thaum sau nrog rau ib qho tshwj xeej nyob rau hauv qhov 3.7 liters per cubic meter, cov khoom siv no tuaj yeem txo qis dua li 10% nyob rau hauv 28 hnub ntawm qhov siab tshaj plaws. Ntawd tseem ua rau sijhawm ntxiv dhau los li 45 feeb thaum sib xyaw nrog rau lus txhawb dej. Rau qhov chaw uas muaj neeg nres tsheb ntau lossis tau txais kev hloov pauv ntawm teeb liab, SRA tso caij ntau dua rau qhov chaw uas tsis txaus siab. Qhov tsha tsha tso caij no txhais tau hais tias cov kab ntsug yuav tshwm sim ntau dua li xav nyob rau qhov chaw uas yuav tsum rov qhov chaw.

Yog vim li cas RDP muaj kev sib cuag zoo tshaj thiab kev tiv thaiv kab ntsug

Duab ntaub polymer rov qab los siv (RDP) ua haujlwm nyhuv dua li SRAs uas tsuas yog siv ib txoj hauv kev. Thaum muab RDP rau hauv mortar systems, nws ua tau peb yam hnav li cas li: tsim duab ntaub polymer zoo sib txuas, txhim kho lub tseem ceeb ntawm pores kom dhau dej hauv khoom, thiab txhim kho kev sib txuas ntawm cov khoom sib txawv hauv daim duab. Vim tias cov cuab yeej no sib txuas nrog tib siab, joint filler uas tsim los ntawm RDP tuaj yeem tiv thaiv dua ib plhaus dua feem ntau ntawm kev hloov khib nyiab ua rau crack tas li SRAs tsis muaj lwm yam. Qhov kev soj ntsuam saib pom tias thaum tus neeg xaiv muab RDP tshuab li 6 mus 8 percent rau hauv mortar, yuav muaj feem ntau hnub crack tom qab ib xyoo siv nyob rau hauv kev siv theej thaj.

Kev tsim kho Joint Filler Muaj Kev Llub Ntawm Kev Shrinking nrog RDP: Txoj Cai Dab Neeg

Sib piv kev siv hauv kev tsim kho daim duab thiab kev shrinking

Feem RDP Thaum Muaj Qhov Sib Txawv Ntawm KeV Hloov Khib Nyiab

Cov ntaub ntawv saum field pom tias cov theem no tiv thaiv 85% ntawm cov kev puas tsob uas muaj kev hla siab yog tias siv nrog kev siv kho tswj yim raws ACI 548.3R-21 guidelines.

Kev Siv RDP-Enhanced Joint Fillers Nyob Rau Hauv Cheeb Tsam

Cov kev kho tshiab dhau los ntawm cov chaw nyob nuj nqis muaj txij hauv kev pab RDP zoo, thiab siv cov filler kho tshiab uas tuaj sau lub joint dua 10 lossis ntau tshaj li thawj zaug. Cov neeg tsim khoom nug tau 40% ntev dua los ntawm kev siv mortar zoo dua, kom tsis txhob muaj kev lag hauv qab twg.

Txoj Kev Xaiv Mus Rau Lub Tsev Ua Haujlwm Zoo, Repair Mortars Ua Ntej Tsheb

Sai hauv kev tsim khoom tam sim no muaj feem ntau yog siv cov mortar RDP-uas kho tshiab uas muaj drying shrinkage tsawg dua 12% thiab muaj zog tso caij ntau npaum li 25 MPa. Cov khoom no txhawj xeeb rau EN 1504-3 standards rau kev kho tsev, thiab tshem tawm 70% ntawm cov kev kho kho tawm tom qab siv uas feem ntau pom nyob rau cov filler cement-based feem ntau.

Ua Siab Loj Txog Qhov Yeej Zoo: RDP, Curing, thiab Joint Design

Qhov Ceev Ntawm Kev Curing Nyob Rau Hauv Kev Pab RDP Zoo

Yog xav kom cov duab ntoo sib thooj tshuaj (RDP) li cas los ceev meem rov qab siab, nws yuav tsum tau txhawb nqa raws standards ASTM. Sauv kom muaj dej zoo rau peb hnub thiaj li RDP-modified mortars tuaj yeem tsim kho tus kheej polymer network peb xav tau. Qhov no tuaj yeem txo qhov capillary pressure li 30 mus 40% kom compared to regular uncured materials. Qhov kev paub txhawb ntawm cheebtsam pom tias - cov neeg ua haujlwm uas siv fog curing techniques lossis siv breathable membranes thaum chiv ua haujlwm feem ntau, lawv pom tias muaj microcracks tsawg dua li ib pliag rau lawv joint fillers thaum ua haujlwm nyob rau hauv 90 degree Fahrenheit conditions uas yeej nyuaj.

Txhim kho Control Joints nrog RDP-Modified Materials

Puas tuaj yeem siv RDP thinstead of Mechanical Crack Control Measures?

RDP tshaj tshav kom sov tsis ntau li, tab sis nws pab zoo tshaj yog tias siv nrog lwm txoj hkeem. Rau qhov chaw uas neeg mus dag zog thiab cov kab roj muaj zog siab dua 500 psi, ces yuav tsum tau siv cov cuab yeej hlau los pab. Qhov zoo tshaj plaws yog tias RDP pab rau tus khev tshav tso cai kom siv rebar tsawg dua li 30% nyob rau hauv sab nraud tsev nrog tsis tuaj yeem ua rau ACI 224R-01 yuam kev rau qhov ntau ntawm kev sov. Yog mloog rau qhov chaw sib txawv, qhov sib txawv ntawm kev siv khoom sib txawv. Xaum rau qhov chaw ntub, yog tias ntxiv ib leeg li 4.2% RDP nrog cellulose fibers, ces tuaj yeem tshem tsov rau saum paus nyob rau hauv tsev kho vaj tse no tsis tas tau rau lub teb chaws twg muaj neeg nrawm. Qhov no pab txawm ntau dua thiab tsawg nqi ntau dua nyob rau ntau qhov chaw.

FAQ Qeb

Qhov sov los ntawm kev lag lag yog dab tsi rau hauv khoom siv cement?

Qhov sov los ntawm kev lag lag feem ntau yog los ntawm kev lag lag thaum khoom siv cement lag thiab ua kom sov, feem ntau yog 15-20%.

Yuav ua li cas kom sov los ntawm kev lag lag?

Kev siv Redispersible Polymer Powder (RDP) hauv kev xaum tseem ceeb tuaj yeem pab kom txo qhov chaw nqus los ntawm kev tsim cov duv polymer uas tuaj yeem nrhiav kev nyuaj siab.

Yog twg yog SRAs, thiab lawv sib piv li cas rau RDP?

Cov khoom siv xaum tseem ceeb (SRAs) tuaj yeem rov qib qhov zog ntawm kab ruaj ruaj thiab kev nyuaj siab, tab sis lawv tuaj yeem ua rau cov chaw xaum tseem ceeb muaj zog dua li RDP, uas muaj kev sib txuas zoo dua thiab kev tiv thaiv tsis pub hloov pauv.

Yuav ua li cas kev kho kom raug rau kev pab RDP zoo dua?

Kev kho kom raug rau tuaj yeem pab RDP hloov tiam rau kev tsim ib qhov kev sib cuag duv zoo, kom txo qhov zog ruaj ruaj thiab kev tsim cov duv nqaij ntsuab.