Lub teeb yuag qhob ntxiv | Kev Ua Haujlwm Siab Ua Foaming Cov Neeg Sawv Cev Rau Cov Khoom Siv Ntawm Tes
Kev faib tawm ntawm cov khoom ua kom tawv pob zeb thiab cov khoom ua kom tawv cement sai
Dab tsi yog tshuaj ua kom tawv pob zeb?
Khoom ua kom tawv pob zeb yog ib hom khoom sib xyaw tseem ceeb uas siv thaum pib hauv keeb kwm kev tsim khoom sib xyaw pob zeb. Txog tam sim no, kev lag luam tau tsim tau ntau hom tshuaj ua kom tawv pob zeb, xws li chloride thiab sulfate. Raws li qhov no, kev tshawb fawb tau tsim ntau hom khoom sib xyaw pob zeb sib xyaw, xws li tshuaj txo dej muaj zog thaum ntxov, hom antifreeze muaj zog thaum ntxov, thiab tshuaj nqus dej muaj zog thaum ntxov, thiab lwm yam. Raws li lawv cov tshuaj muaj tshuaj, cov tshuaj muaj zog thaum ntxov tuaj yeem faib ua cov tshuaj inorganic muaj zog thaum ntxov, cov tshuaj organic muaj zog thaum ntxov, thiab cov khoom sib xyaw ua ke.
Dab tsi yog tshuaj ua kom pob zeb nplaum sai?
Cement quick-setting agent is a concrete admixture that makes cement concrete set and hardens quickly. The cement quick-setting agent only accounts for 2% rau 3% of the amount of cement in the concrete. Tseem, it can make the concrete initially set within 5 feeb. The accelerator sets within 12 minutes to achieve the purpose of emergency repair or the rapid setting of concrete in the shaft. Cement quick-setting agent is mainly used in sprayed concrete and sprayed mortar engineering. It is widely used in underground engineering, tunnel engineering, dyke slope reinforcement, water plugging engineering, slip form construction, road repair, spray anchor support, thiab lwm yam. Fast hardening technology. Cement quick-setting agent can be divided into powder cement quick-setting agent and liquid cement quick-setting agent according to the status; according to its alkali metal ion content, it can be divided into alkaline cement quick-setting agent and low alkali cement quick-setting agent and alkali-free cement quick-setting agent three categories; according to the main chemical substances, it can be divided into aluminum oxide clinker plus carbonate system, sulfoaluminate system, water glass system and low Alkali or alkali-free cement quick-setting agent, thiab lwm yam. Besides, there are reports that organic-inorganic composite cement quick-setting agents are used to develop organic-inorganic blended cement quick-setting agents. Its compressive strength proliferates and can significantly reduce the amount of dust and rebound during construction. However, organic cement The introduction of a quick-setting agent often affects the quick-setting effect of the cement slurry.
Txoj kev ua haujlwm ntawm concrete hardening agent thiab cement quick-setting agent
Txawm yog concrete hardening agent lossis cement quick-setting agent, cov hom sib txawv, thiab txoj kev ua haujlwm kuj txawv, thiab kev ua kom muaj zog thaum ntxov lossis coagulation ntawm concrete hardening agent lossis cement quick-setting agent feem ntau yuav tsum tau ua los ntawm ntau txoj kev ua haujlwm.
Concrete hardening agent ua haujlwm li cas?
Txoj kev ua haujlwm ntawm concrete hardening agent thiab cement quick-setting agent zoo ib yam, ob leeg ua tau zog ntxov lossis ua kom muaj zog sai los ntawm kev txhawb hydration ntawm tricalcium aluminate thiab tricalcium silicate hauv Portland cement. Qhov txawv yog tias qhov muaj zog thaum ntxov ntawm cement agent feem ntau pom tau hauv ntau yam. It will not only promote the hydration of tricalcium aluminate but also promote the hydration of tricalcium silicate so that the concrete hardening agent can be used in the early stage of hydration. Continue to play the role of initial strength to not affect the later power of concrete too much.
How does cement quick-setting agent work?
The coagulation acceleration of cement quick-setting agent is often highly targeted. A series of chemical reactions destroy the retarding effect of gypsum in cement and rapidly and massively form calcium aluminate hydrate, and calcium sulfoaluminate hydrate Such as insoluble matter shortens the induction period of cement and promotes the rapid setting of cement paste, but at the same time, it will inevitably lead to problems such as insufficient strength of cement mortar (or sprayed concrete) in the later stage.
The purpose of concrete hardening agent and cement quick-setting agent
There are significant differences between concrete hardening agent and cement quick-setting agent in type, kev ua tau zoo, effect and mechanism, and their applications are also quite different.
In the concrete process, adding a concrete hardening agent can significantly increase the early strength of concrete without affecting its later strength, and can dramatically shorten the curing time. Yog li ntawd, first strength agents are mostly used in winter construction and concrete component production. In winter construction, the concrete with early strength requirements generally needs to add an early strength agent to shorten the demoulding and curing time, speed up the construction progress, and effectively avoid freezing damage, thereby effectively improving construction efficiency and saving concrete construction costs. In the production of concrete components, the application of concrete hardening agents is even more common to stretch steel bars as soon as possible, speed up formwork turnover and pedestal utilization.
Because the setting time of the cement quick-setting agent is short, it is not possible to ensure that the concrete is well mixed and poured within a short period before the initial setting. It is not suitable for the general formwork method of pouring concrete. Yog li ntawd, accelerators should not be used in general engineering. Cement quick-setting agent is mostly used for sprayed concrete construction or as a quick plugging material.
Cie-China.org yog tus thawj coj ua npuas ncauj qhob ntxiv muab cov pob zeb ua npuas ncauj ua npuas ncauj, superplasticizer,Ua npuas ncauj qhob lub zog enhancer rau lub teeb yuag pob zeb, CLC blocks. Yog tias koj tab tom nrhiav tshuaj ua kom tawv pob zeb thov koj xav tias dawb rau tiv tauj peb.