钙矾石

低碱度硫铝酸盐水泥水化产物主要为钙矾石、水化硅酸钙凝胶以及水化碳铝酸钙。

Hydration products of low alkalinity sulphate aluminium cement were Aft , hydration calcium silicate gel and hydration carbon calcium aluminates .

制备贝利特硫铝酸盐水泥的锂渣掺加量可达16%，低品位铝矾土掺量为28%；贝利特硫铝酸盐水泥水化产物为钙矾石和水化硅酸钙凝胶。

The content of calcium and aluminum residue and low grade bauxite were up to16 % and28 % respectively in preparing belite sulphate aluminium cement . Hydration products of belite sulphate aluminium cement were Aft , hydration calcium silicate gel .

管状钙矾石是近年来在SEM中首次被观测到。

The pipe ettringite was first observed by SEM in recent years .

煅烧高岭石中Al的溶出活性决定了硬化体中钙矾石的生成量。

The activity of Al from calcined kaolinite affects the forming ettringite of hardening system .

钙矾石膨胀机理的SEM研究

SEM Investigation on the Expansion Mechanism of Ettringite

结果表明，水化产物主要是C-S-H、钙矾石、Ca（OH）2。

The results show that the hydrated products include mainly C-S-H , ettringite .

人工合成硫酸型钙矾石和铬酸型钙矾石晶体的X射线衍射谱显示，铬酸型钙矾石的晶格比硫酸型钙矾石的稍大一些。

The lattice of chromate ettringite appears a little bigger than that of ettringite according to their X-ray diffraction patterns .

采用XRD分析了自燃煤矸石胶凝材料中活性Al2O3在不同因素影响下水化形成钙矾石的情况。

The ettringite formation of active Al_2O_3 in the spontaneous combustion coal gangue cementitious material is analyzed by XRD .

水泥基复合材料中SO3与Al2O3含量对钙矾石及膨胀性能影响的研究

The study of influence of SO_3 and Al_2O_3 content in cement group complex materials on ettringite and concrete expansion property

尽管如此，双铬钙矾石的成功合成对同时含有Cr（Ⅲ）和CrO2-4的废水进行S/S处理提供了新的思路。

However the successful synthesis of the double chromium ettringite provides an innovative treatment of the wastewater which contains both Cr (ⅲ) and Cr (ⅵ) .

同时发现，硬化体中钙矾石和CSH凝胶粒子等的生成，对固化稳定Cr（Ⅵ）离子和防止其溶出作用。

It is also indicated that the formation of ettringite and C S H gel in hardened fly ashes contributes significantly to the fixation and stabilization of Cr (ⅵ) .

实验结果表明，公路粉煤灰水泥的主要水化产物为C-S-H凝胶、钙矾石及少量的Ca（OH）2。

The experimental results showed that C S H gel and Aft were the main hydrated products in the fly ash cements for high road .

用压汞仪（MIP）分别测定了掺钙矾石型和氧化镁膨胀剂水泥净浆及砂浆的孔结构，分析二者对水泥石孔结构的影响。

The pore structure of cement paste and mortar added with the two agents was characterized using mercury intrusion porosimeter .

钙矾石表面碳化反应对pco＿2，pH＿2O均为一级反应，反应的表观活化能为&39907J·mol￣（－1）。

Carbonation on the surface of ettringite for both pco_2 and pH_O is the first-order stage , and the apparent activated energy is 39907J / mol.

通过DTA，SEM观察和大量X射线衍射分析，给出了钙矾石稳定存在和结构脱水变异的温度范围以及变异后的结构特征；

By means of DTA , SEM and XRD , the range of temperature for the stability of crystal and the variation of structure due to dehydration of ettringite is studied .

首先，采用微观实验方法对砂浆中的钙矾石的生长规律进行了研究，通过定量X衍射分析测定了钙矾石含量随侵蚀时间的演化规律。

Firstly , the growth law of ettringite in mortar was studied by using of micro-experiments , and the quantity evolution of ettringite vs. erosion time was measured with the method of quantitative XRD ( X-Radial Diffraction ) .

H表面吸附的SO4~（2-）离子，可以成为混凝土中钙矾石晶体延迟生成的硫酸盐来源，钙矾石晶体也可以在C-S-H凝胶中生成。

SO_4 ~ ( 2 - ) ions adsorbed on C-S-H surface canbecome sulphate source of delayed ettringite in concrete , the ettringite crystal may be alsoformed in C-S-H gel .

采用扫描电镜（SEM）照片及能谱分析（EDS）对石灰改良土的组成和结构进行微观分析，在石灰土中首次发现了连结成空间网状结构的钙矾石结晶体。

The structure and components of fillings are microscopically analyzed by electron microscopy ( SEM ) and energy spectrum ( EDS ), and reticular ettringite crystals were discovered at the first time .

原因是由于硅灰的稀释作用和火山灰效应减少了水泥净浆中Ca（OH）2的量，从而降低了水泥净浆试件在硫酸盐溶液侵蚀下形成的膨胀性钙矾石的量。

The factor is that the Ca ( OH ) 2 in the cement paste is reduced and the formation of expansive ettringite against sulfate attack is decreased yet by the dilute effect and the pozzolanic reaction of silica fume .

通过对水泥水化初期浆体中钙矾石生成量的测定、水泥浆体液相组成的分析及XRD，DTA，SEM分析，对这种新型缓凝剂的作用机理进行了系统研究。

The action mechanism of the retarder was studied by XRD , SEM , DTA with the measurements of ettringite formed and the analyses of the liquid composition of cement pastes at the initial hydration stage .

从微观角度分析，将TSA侵蚀过程分为四个阶段：离子迁移期，钙矾石生成期，石膏生成期和碳硫硅酸钙生成期.评价的形成性问题；

According to the microstructure development of mortar , TSA includes the following four procedures : diffusion of ions , ettringite formation , gypsum formation and thaumasite formation .

X射线衍射分析表明高掺量CLS促进硬化水泥中生成钙矾石，抑制水化硅酸钙（CSH）的早期生成，但对CSH的后期生成无影响。

X-ray diffraction analysis shows that CLS can promote the growth of ettringite and restrain the growth of CSH at early-age , while the long-term growth of CSH is not be affected .

含锶钙矾石中Sr的键级和SrO共价键级大于钙矾石中的Ca和CaO键.由此可以认为这是含锶硫铝酸钙水化强度高于硫铝酸酸钙的主要原因之一。

What the bond order of Sr and the covalent bond order of Sr-O in ettringite with strontium are higher than these of ettringite is the main reason , that the strength of ettringite with strontium is higher than that of ettringite .

早期水化形成的钙矾石，起到填充空隙作用，和C-S-H凝胶一起构成硬化浆体的骨架，有利于促进水泥凝结和提高早期强度。

Ettringite formed during early hydration filled the porous space , which contributed together with C-S-H gel to shorten the setting time and to improve the early strength of cement .

在硫酸盐外加剂的作用下，粘土中的活性氧化铝与Ca（OH）2反应生成针状的钙矾石晶体，从而使土团与水化产物相互联接，大大提高稳定土的强度和水稳性；

The sulphate admixture can promote the reaction of the active alumina of soil with Ca ( OH ) 2 to form more aciculate AFt ( 3CaO · Al 2O 3 · 3CaSO4 · 32H 2O ) crystal and increase greatly the strength and water stabilizing property of stabilized soil .

最后，通过BET、XRD、SEM对补偿收缩石屑砂浆的微观机理进行了研究，并应用分形理论与粘弹性力学模型，结合试验结果对水镁石和钙矾石的膨胀规律进行了解释。

At last , microcosmic mechanism has been studied on shrinkage-compensating crushed stone mortar by BET , XRD and SEM methods . Conjuncted with the experiment results , the expansion discipline of Ettringite and Brucite was studied by using the theory of fractal geometry and viscoelastic mechanism model .

石膏基复合胶凝材料硬化体结构为二水石膏、钙矾石晶体和硬硅钙石交叉共生，C-S-H凝胶包围在其周围及接触点，未反应完全的矿渣颗粒填充孔隙。

The structure of hardening gypsum-based cementing composite body is Calcium sulfate dehydrate , Ettringite and Xonotlite crosswise symbiotic crystallization , C-S-H ( gel ) around them with unreacted slag particles fill the pore .

通过SEM分析，得出BFS固化体高温条件下强度衰退主要原因是由于硅钙石和钙矾石两种水化产物结晶发育不一致，固化体后期处于高应力状态而产生的。

Through SEM analysis the main reason of strength regression of BFS solid state under high temperature is due to the uneven growth of crystallization of hydrates of silicon calcic rock and calcium alumna rock and finally occurs under the high stress condition at the later period of solid state .

轻烧氧化镁和钙矾石的膨胀性能对比研究

Comparative Study on Expansion of Undercalcined Magnesia and Ettringite Expansive Agents

铬酸型钙矾石与硫酸型钙矾石的差异性研究

The differences between the characters of chromate ettringite and of ettringite