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(1 中國建筑科學(xué)研究院有限公司, 北京 100013; 2 中國建筑技術(shù)集團(tuán)有限公司, 北京 100013;3 北京寶維森新材料科技發(fā)展有限公司, 北京 101112)

摘要: 緩粘結(jié)預(yù)應(yīng)力混凝土梁由無粘結(jié)預(yù)應(yīng)力混凝土梁轉(zhuǎn)變?yōu)橛姓辰Y(jié)預(yù)應(yīng)力混凝土梁的判定標(biāo)準(zhǔn)是結(jié)構(gòu)投入正常使用狀態(tài)的重要依據(jù). 在緩凝粘合劑不同錐入度和不同邵氏硬度條件下,對(duì) 15 根緩粘結(jié)預(yù)應(yīng)力混凝土梁進(jìn)行抗彎性能試驗(yàn),建立緩粘結(jié)預(yù)應(yīng)力混凝土梁開裂荷載、裂縫數(shù)量和極限承載力與錐入度、邵氏硬度的關(guān)系. 同時(shí),與 2 根有粘結(jié)預(yù)應(yīng)力混凝土梁和 2 根無粘結(jié)預(yù)應(yīng)力混凝土梁的抗彎性能試驗(yàn)作對(duì)比. 結(jié)果表明:當(dāng)緩凝粘合劑邵氏硬度達(dá)到 50D 時(shí),緩粘結(jié)預(yù)應(yīng)力混凝土梁達(dá)到有粘結(jié)預(yù)應(yīng)力混凝土梁的抗彎性能,即緩粘結(jié)預(yù)應(yīng)力混凝土梁轉(zhuǎn)變?yōu)橛姓辰Y(jié)預(yù)應(yīng)力混凝土梁. 據(jù)此定義緩凝粘合劑邵氏硬度 50D 為有效硬度. 在以上試驗(yàn)的基礎(chǔ)上,制作 3 組緩凝粘合劑抗壓試件,測(cè)得抗壓試件邵氏硬度達(dá)到 50D 時(shí),緩凝粘合劑抗壓強(qiáng)度為 10MPa,并定義此為有效強(qiáng)度.

關(guān)鍵詞: 預(yù)應(yīng)力混凝土梁; 緩凝粘合劑; 抗彎性能; 有效硬度; 有效強(qiáng)度

中圖分類號(hào):TU378. 2 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)08-0113-06

DOI:10. 19701 / j. jzjg. 20210863

Experimental study on effective strength of retarded adhesive for prestressed concrete beams

JIANG Fangxin1,2, CHEN Shangzhi1,2, LI Peixun1,2,3, LI Xianhua1,2, WANG Bo3

(1 China Academy of Building Research, Beijing 100013, China; 2 China Building Technique Group Co. , Ltd. ,Beijing 100013, China; 3 Broad Vision Technology and Materials Co. , Ltd. , Beijing 101112, China)

Abstract: The criterion for the transition of unbonded prestressed concrete beam to bonded prestressed concrete beam is animportant basis for the normal use of the retard-bonded prestressed concrete beams. Under the conditions of different conepenetration and Shore hardness of retarded adhesive, the flexural performance test of 15 retard-bonded prestressed concretebeams was carried out, and the relationship between the cone penetration, Shore hardness, and the cracking load, thenumber of cracks and the ultimate bearing capacity of the retard-bonded prestressed concrete beams was established. At thesame time, it was compared with the flexural performance test of two bonded prestressed concrete beams and two unbondedprestressed concrete beams. The results show that when the Shore hardness of the retarded adhesive reaches 50D, theflexural performance of the retard-bonded prestressed concrete beam can be achieved, that is, the retard-bonded prestressedconcrete beam can be transformed into bonded prestressed concrete beam. It is defined as: the Shore hardness of retardingadhesive 50D is the effective hardness. Based on the above tests, three groups of compressive specimens of retarderadhesive were made. When the Shore hardness of the compressive specimens reaches 50D, the compressive strength of theretarder adhesive is 10MPa, which was defined as the effective strength.

Keywords:prestressed concrete beam; retarded adhesive; flexural performance; effective hardness; effective strength

∗中國建筑科學(xué)研究院有限公司科研基金項(xiàng)目(20181802330730041).

第一作者:蔣方新,碩士,高級(jí)工程師,主要從事預(yù)應(yīng)力結(jié)構(gòu)工程研究,Email:316271991@ qq. com.

[引用本文] 蔣方新,陳尚志,李佩勛,等. 預(yù)應(yīng)力混凝土梁緩凝粘合劑有效強(qiáng)度試驗(yàn)研究[J]. 建筑結(jié)構(gòu),2023,53(8):113-118. JIANG Fangxin,CHEN Shangzhi,LI Peixun, et al. Experimental study on effective strength of retardedadhesive for prestressed concrete beams[J]. Building Structure,2023,53(8):113-118.