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首頁> 美國衛(wèi)生研究院文獻(xiàn)>Materials >Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators
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Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

機(jī)譯：不同的高效減水劑和緩凝劑對不同活化劑的單份粉煤灰-礦渣共混地質(zhì)聚合物性能的影響

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Currently, there are a very limited number of studies on the effect of admixtures on properties of ‘one-part’ geopolymers. This paper reports the effects of different superplasticizers and retarders on fresh and hardened properties of one-part fly ash-slag blended geopolymers made by different solid activators. Two different grades of sodium silicate, namely anhydrous sodium metasilicate powder (nSiO Na O = 0.9) and GD Grade sodium silicate powder (nSiO Na O = 2.0) were used as the solid activators. Five different commercially available superplasticizers, including three modified polycarboxylate-based superplasticizers (denoted as PC1, PC2, and PC3) and two naphthalene-based superplasticizers (denoted as N1 and N2), as well as three different retarders, including sucrose, anhydrous borax and a commercially available retarder, were investigated. Workability, setting time and compressive strength of the mixtures without and with addition of each ‘individual’ admixture were measured. The results showed the effect of admixtures on the properties of the one-part geopolymers significantly depended on the type of solid activator and the type of admixture used. When GD Grade sodium silicate powder was used as the solid activator, all investigated admixtures not only had no positive effect on the workability and setting time, but also significantly reduced the compressive strength of the mixture. However, when anhydrous sodium metasilicate powder was used as the solid activator, the PC1 and sucrose were the best performing superplasticizer and retarder, respectively, causing no reduction in the compressive strength, but significant increase in the workability (up to + 72%) and setting time (up to + 111%), respectively as compared to the mixture with no admixture. In addition, the results also showed that addition of ‘ ’ admixtures (i.e., PC1 in the presence of sucrose) significantly increased the workability (up to + 39%) and setting time (up to + 141%), but slightly reduced the compressive strength (?16%) of the mixture activated by anhydrous sodium metasilicate powder, as compared to the mixture with no admixture.
機(jī)譯：目前，關(guān)于摻合料對“單一”地質(zhì)聚合物性能影響的研究非常有限。本文報(bào)道了不同的??高效減水劑和緩凝劑對由不同的固體活化劑制成的粉煤灰-礦渣摻混地質(zhì)聚合物的一部分的新鮮和硬化性能的影響。兩種不同級別的硅酸鈉，即無水偏硅酸鈉粉末（nSiO / nNa O = 0.9）和GD級硅酸鈉粉末（nSiO / nNa O = 2.0）被用作固體活化劑。五種不同的市售高效減水劑，包括三種改性的基于聚羧酸鹽的高效減水劑（分別表示為PC1，PC2和PC3）和兩種基于萘的高效減水劑（分別表示為N1和N2），以及三種不同的緩凝劑，包括蔗糖，無水硼砂和對市售的緩凝劑進(jìn)行了研究。測量了不添加和添加每種“單獨(dú)”混合物的混合物的可加工性，凝結(jié)時(shí)間和抗壓強(qiáng)度。結(jié)果表明，混合物對單組分地質(zhì)聚合物性能的影響明顯取決于固體活化劑的類型和所用混合物的類型。當(dāng)使用GD級硅酸鈉粉末作為固體活化劑時(shí)，所有研究的混合物不僅對可加工性和凝固時(shí)間沒有積極影響，而且顯著降低了混合物的抗壓強(qiáng)度。但是，當(dāng)使用無水偏硅酸鈉粉末作為固體活化劑時(shí)，PC1和蔗糖分別是性能最好的高效減水劑和緩凝劑，其抗壓強(qiáng)度沒有降低，但可加工性顯著提高（最高+ 72％）和與沒有摻合料的混合物相比，固化時(shí)間（最多為+ 111％）。此外，結(jié)果還表明，添加''混合物（即，存在蔗糖的PC1）顯著提高了可加工性（最高+ 39％）和凝固時(shí)間（最高+ 141％），但略微降低了壓縮性與無混合物的混合物相比，無水偏硅酸鈉粉末活化的混合物的強(qiáng)度（?16％）。

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