کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
261262 503690 2017 6 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
Study on early-age cracking of cement-based materials with superplasticizers
ترجمه فارسی عنوان
بررسی ایجاد ترک اوایل سن از مواد مبتنی بر سیمان با superplasticizers
کلمات کلیدی
Superplasticizers؛ اوایل سن ایجاد ترک؛ ثبات حجم. حلقه بیضی؛ زمان ایجاد ترک اولیه
Superplasticizers; Early-age cracking; Volume stability; Ellipse ring; Initial cracking time
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی

The addition of superplasticizers is an important approach to prepare high performance cement-based materials. The effect of polynaphthalene series superplasticizer (PNS) and polycarboxylate type superplasticizer (PC) on early-age cracking and volume stability of cement-based materials was investigated by means of multi-channel ellipse ring shrinkage cracking test, free shrinkage and strength test. The general effect of PNS and PC is to increase initial cracking time of mortars, and decrease cracking sensitivity of mortars. As for decreasing cracking sensitivity of mortars, PC > H-UNF (high-thickness-type PNS) > C-UNF (common-thickness-type PNS). To incorporate superplasticizers is apparently to increases free shrinkage of mortars when keeping the constant W/B ratio and the content of cement pastes. As for the effect of controlling volume stability of mortars, PC > C-UNF > H-UNF. Maximum crack width of mortars with PC is lower, but the development rate of maximum crack width of mortars with H-UNF is faster in comparison with control mortars. Flexural and compressive strength of mortars and concretes at 28 days increased with increasing superplasticizer dosages under drying conditions. C-UNF was approximate to H-UNF, but PC was superior to PNS in the aspect of increasing strength of cement-based materials.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 21, Issue 11, November 2007, Pages 2017–2022
نویسندگان
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