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تلفن: ۰۹۲۱۶۴۲۶۳۸۴

دانلود رایگان مقاله انگلیسی تاثیر فشارهای ارگانیک بر هیدراتاسیون و سخت شدن سیمان پرتلند – هینداوی ۲۰۱۸

عنوان فارسی: تاثیر فشارهای ارگانیک بر هیدراتاسیون و سخت شدن سیمان پرتلند
عنوان انگلیسی: Influence of Organic Esters on Portland Cement Hydration and Hardening
تعداد صفحات مقاله انگلیسی : 11 تعداد صفحات ترجمه فارسی : ترجمه نشده
سال انتشار : 2018 نشریه : هینداوی - Hindawi
فرمت مقاله انگلیسی : PDF کد محصول : E8481
محتوای فایل : PDF حجم فایل : mb 3
رشته های مرتبط با این مقاله: عمران، شیمی
گرایش های مرتبط با این مقاله: مدیریت ساخت، شیمی پلیمر
مجله: پیشرفت در علوم و مهندسی مواد - Advances in Materials Science and Engineering
دانشگاه: School of Chemical and Environmental Engineering - China University of Mining and Technology - China
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چکیده

0is paper investigated the effect of organic compounds with ester groups on the hydration and hardening of cement. 0e effects of five kinds of organic compounds with ester groups (ethyl acetate, dimethyl oxalate, glyceryl triacetate, trimethyl phosphate, and triethanolamine borate) on hydration heat, hydration degree, setting time, mechanical properties, microstructure, and pore structure of hardened cement slurry were studied. 0e test results showed that esters can make the end time of cement hydration induction longer and delay the occurrence of the second exothermic peak. Also, the effect of five kinds of esters on the hydration and hardening of cement was basically followed by TG> TB> DMO> EAC> TMP. In terms of molecular structure, for organic compounds containing only ester groups, the higher the number of ester groups, the greater the effect on the hydration of cement. 0e introduction of other functional groups (such as phosphate or borate) will influence the effect of the esters.

نتیجه گیری

4. Conclusions

Based on the experimental results, the following conclusions can be drawn:

(1) Ester can make the end time of cement hydration induction longer and delay the occurrence of the second exothermic peak, indicating that it has a delayed effect on the hydration reaction rate of cement at early stage (hydration induction period and acceleration period).

(2) TG, TB, DMO, and EAC increased the second exothermic peak and hydration degree of cement and promoted the formation of hydration products and the optimization of the pore structure. Macroscopic performance is that mechanical properties of cement at 3 d and 28 d improved significantly. TMP has a retarding effect on cement and reduces the second exothermic peak of cement and inhibits the formation of early hydration products, which reduces the strength of cement at 3 d, but it improves the strength of cement at 28 d.

(3) 0e effect of five kinds esters on the hydration and hardening of cement was basically followed by TG> TB> DMO> EAC> TMP. In terms of the molecular structure, for organic compounds containing only ester groups, the higher the number of ester groups, the greater the effect on the hydration of cement. 0e introduction of other functional groups (such as phosphate or borate) will influence the effect of the esters.