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（1 上海煙草集團(tuán)有限責(zé)任公司， 上海 200082； 2 上海建科預(yù)應(yīng)力技術(shù)工程有限公司， 上海 200032）
［摘要］通過采用補(bǔ)償收縮混凝土無縫設(shè)計(jì)和施工新方法，可以實(shí)現(xiàn)超長混凝土結(jié)構(gòu)取消后澆帶或不設(shè)縫的目的，不但可有效縮短工期，且防水性能好,是解決超長混凝土結(jié)構(gòu)裂滲問題的有效技術(shù)途徑。通過混凝土坍落度試驗(yàn)、限制膨脹率試驗(yàn)以及抗壓強(qiáng)度試驗(yàn)，研究了膨脹劑摻量對三種強(qiáng)度等級(jí)補(bǔ)償收縮混凝土的坍落度以及各齡期限制膨脹率和抗壓強(qiáng)度的影響。根據(jù)試驗(yàn)結(jié)果，得出各強(qiáng)度等級(jí)補(bǔ)償收縮混凝土膨脹劑的最優(yōu)摻量，優(yōu)化了混凝土配合比以實(shí)現(xiàn)實(shí)際超長混凝土結(jié)構(gòu)工程對補(bǔ)償收縮混凝土各方面性能的要求。
［關(guān)鍵詞］補(bǔ)償收縮混凝土； 膨脹劑； 坍落度； 限制膨脹率； 抗壓強(qiáng)度
中圖分類號(hào)：TU528-55文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)13-0103-04
Mix proportion design and experimental study on shrinkage compensating concrete
Gu Zhengyu1, Zhang Defeng2, Feng Weimin1, Yang Yichao1
(1 Shanghai Tobacco Group Co., Ltd., Shanghai 200082, China; 2 Shanghai Jianke Prestress Engineering Co., Ltd., Shanghai 200032, China)
Abstract:By using shrinkage compensating concrete in seamless design and new construction method, the post casting belts or joints can be cancelled in super-long concrete structures. This method can not only effectively shorten construction period but also obtain good effects on waterproof property. Therefore, shrinkage compensating concrete is an effective technical way to solve the problem of cracks and infiltration in super-long concrete structures. The influences of amount of expansive agent on slump, limited expansion ratio and compressive strength of shrinkage compensating concrete with three strength grades and different ages were studied through slump test, limited expansion ratio test and compressive strength test. Based on the test results, the optimal amount of expansive agent in shrinkage compensating concrete was determined for each strength grade for concrete and the mix proportion of concrete was optimized, so that the performance requirements on shrinkage compensating concrete in practical super-long concrete structures could be met.
Keywords:shrinkage compensating concrete; expansive agent; slump; limited expansion ratio; compressive strength
*上海煙草集團(tuán)有限責(zé)任公司科技項(xiàng)目（SZBCW201500462）。
作者簡介: 顧征宇，本科，高級(jí)工程師，Email：guzy@sh.tobacco.com.cn。
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