Lub teeb yuag qhob ntxiv | Kev Ua Haujlwm Siab Ua Foaming Cov Neeg Sawv Cev Rau Cov Khoom Siv Ntawm Tes
Polycarboxylate water-reducing agent yog ib hom graft copolymer uas muaj qauv molecular zoo li comb, lub saw loj yog ib lub saw carbon alkyl uas muaj ib pab pawg carboxyl function, thiab lub saw sab yog ua los ntawm polyoxyethylene (thiab/los yog polyoxypropylene) nrog cov qauv ntev sib txawv.
Pab carboxyl ntawm lub saw loj ntawm polycarboxylate superplasticizer raug nqus rau ntawm cov cement los ntawm kev rub electrostatic,Polyoxyethylene units uas ntev sib txawv hauv side chain tiv thaiv lwm cov cement los ze los ntawm steric thaiv, ua rau cement tawg mus. Yog piv rau naphthalene-based water reducers, polycarboxylate superplasticizers muaj peev xwm dispersing rau cement muaj zog dua thiab qhia tau tias muaj kev txo dej hauv pob zeb nplaum siab dua. Nws tus nqi txo dej ntau dua 40%, uas tuaj yeem txo tau dej sib xyaw pob zeb nplaum ntau heev.
Kev siv dej ntawm pob zeb nplaum tuaj yeem txiav txim siab qhov piv dej-rau-binder (dej-cement-ratio), thiab qhov piv dej-rau-binder (dej-cement-ratio) cuam tshuam ncaj qha rau cov yam ntxwv tshuab ntawm pob zeb. Qhov cai ntawm dej-cement piv txwv xav tias 28-hnub compressive zog ntawm pob zeb nplaum yog ncaj qha sib npaug rau qhov sib piv dej-cement. Txhawm rau kom ntseeg tau qhov muaj zog nias ntawm pob zeb nplaum, cov kws tsim khoom feem ntau siv qhov piv dej-rau-binder tsawg dua.
Txhawm rau txhim kho kev lag luam ntawm pob zeb nplaum, txo kev siv dej ntawm pob zeb nplaum yog txoj kev zoo tshaj plaws los txo qhov piv dej-rau-binder ntawm pob zeb nplaum.
Kev txo dej sib tov pob zeb nplaum yuav cuam tshuam rau kev ua haujlwm ntawm pob zeb tshiab, and the polycarboxylate water reducing agent can effectively ensure the workability of the concrete mixture.Furthermore, the organic unity of the polycarboxylic acid water reducing agent and the concrete water consumption is realized.
The change in the water consumption of concrete not only determines the concrete water-to-binder ratio, but also affects the concrete-to-slurry ratio of the concrete.As with the water-binder ratio, the slurry-to-bone ratio is also an important factor that must be considered in the design of the concrete mix ratio.The ratio of the slurry to the concrete mixture is the ratio of the total amount of the mixing water and the cementitious material to the total volume of the aggregate. The change of the ratio of the slurry to the concrete affects the workability and volume stability of the concrete.Compared with the density of the cementitious material (cement: about 3.0 g/cm3; fly ash: 1.9 rau 2.4 g/cm3; ntxhtxhia hmoov: about 2.6 g/cm3), the density of water (1.0 g/cm3) is Much smaller than them,
In the case of the same mass, the change in water consumption has the greatest effect on the total volume of the slurry.Under the condition that the total amount of the rubber material is kept constant, the reduction of the water consumption will inevitably lead to a decrease in the volume of the slurry of the mixture, which affects the workability of the fresh concrete.Therefore, when reducing the water-to-binder ratio by reducing the water consumption of the concrete, the total amount of the rubber should be adjusted to ensure that the ratio of the slurry to the concrete is constant.However, concrete production personnel often neglect the effect of water consumption on the ratio of slurry to bone, which causes the volume of the slurry to vary greatly with the change of water consumption.
In order to ensure the workability of concrete, concrete production personnel have put forward higher technical requirements for polycarboxylate water reducer.The polycarboxylate water reducing agent not only has strong cement dispersing ability, but also needs to have a good plasticizing ability for the concrete mixture, so that the workability of the concrete has a strong dependence on the performance of the polycarboxylate water reducing agent.
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 superplasticizer, thov koj xav tias dawb rau tiv tauj peb.