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(1 中國(guó)建筑科學(xué)研究院有限公司, 北京 100013; 2 中國(guó)建筑技術(shù)集團(tuán)有限公司, 北京 100013)

摘要: 緩粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)中,熱固型緩凝粘合劑的實(shí)際張拉適用期和實(shí)際有效強(qiáng)度期是決定緩粘結(jié)鋼絞線的張拉時(shí)間和結(jié)構(gòu)正常使用時(shí)間的重要條件。 分析了影響熱固型緩凝粘合劑實(shí)際張拉適用期和實(shí)際有效強(qiáng)度期的主要因素,選定了三個(gè)不同標(biāo)準(zhǔn)固化期的熱固型緩凝粘合劑作為試驗(yàn)材料,制作一定數(shù)量的錐入度和邵氏硬度試件。 通過(guò)試驗(yàn),得到了相同溫度條件下,熱固型緩凝粘合劑固化期與實(shí)際張拉適用期和實(shí)際有效強(qiáng)度期的比例關(guān)系,建立起錐入度、邵氏硬度與時(shí)間關(guān)系曲線,以及實(shí)際張拉適用期、實(shí)際有效強(qiáng)度期與溫度關(guān)系曲線。 據(jù)此,提出了實(shí)際張拉試用期和實(shí)際有效強(qiáng)度期與溫度關(guān)系的計(jì)算公式,并進(jìn)行了工程實(shí)例驗(yàn)證。 結(jié)果表明,計(jì)算公式可對(duì)緩粘結(jié)鋼絞線的實(shí)際張拉適用期和實(shí)際有效強(qiáng)度期進(jìn)行較準(zhǔn)確的預(yù)測(cè),對(duì)于工程應(yīng)用具有一定的實(shí)用價(jià)值。

關(guān)鍵詞: 緩粘結(jié)預(yù)應(yīng)力; 熱固型緩凝粘合劑; 實(shí)際張拉適用期; 實(shí)際有效強(qiáng)度期; 估算方法

中圖分類號(hào):TU58+9 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)13-0133-07

DOI:10. 19701 / j. jzjg. 20211044

Method for estimating actual tensile pot life and actual effective strength period of thermosetting retarding adhesives

LI Peixun1,2, JIANG Fangxin1,2, SUN Yue1,2, LIU Yun1,2, YAO Zhangting1,2, LI Mengyan2

(1 China Academy of Building Research, Beijing 100013, China; 2 China Building Technique Group, Beijing 100013, China)

Abstract: In the slowly bonded prestressed concrete structure, the actual tensile pot life and actual effective strength period of thermosetting retarding adhesive are important conditions to determine the tensioning time of slowly bonded steel strand and the normal service time of the structure. The main factors affecting the actual tensile pot life and actual effective strength period of thermosetting retarding adhesive were analyzed. Three thermosetting retarding adhesives with different standard curing periods were selected as test materials to make a certain number of cone penetration and shore hardness specimens. Through the test, the proportional relationship between the curing period of thermosetting retarding adhesive and the actual tensile pot life and actual effective strength period under the same temperature was obtained. The relationship curve between penetration, shore hardness and time, as well as the relationship curve between the actual tensile pot life, actual effective strength period and temperature were established. Based on this, the calculation formulas of the relationship between the actual tensile pot life, the actual effective strength period and temperature were put forward, and verified by an engineering example. The results show that the calculation formula can accurately predict the actual tensile pot life and actual effective strength period of slowly bonded steel strand, and has some practical value for engineering application.

Keywords:slow bond prestress; thermosetting retarding adhesive; actual tensile pot life; actual effective strength period;estimation method