Experimental study on curing index of adhesives for retard⁃bonded prestressed steel strand

doi:10.19491/j.issn.1001-9278.2024.05.017

Abstract

Abstract:

In recent years， the retard⁃bonded pre⁃stressed technology has become popular in the pre⁃stressed structures thanks to its excellent characteristics. The key material for the retard⁃bonded pre⁃stressed technology is the retard⁃bonded pre⁃stressed steel strand， and the technical principle is to bond the steel strand with the surrounding concrete through an adhesive solidified in the steel strand. Therefore， the bonding and anchoring properties of the structure are improved. At present， there are few researches on the curing evaluation index of the adhesive in academic and engineering circles. In this paper， four common curing indexes of the cured adhesives were studied， including shore hardness， tensile shear strength， compressive strength， and bending strength. The results indicated that the corresponding curing time was close to each other when the four curing indexes of the adhesive reached maximum， indicating that the four curing indexes were consistent. The maximum values of shore hardness exhibited the smallest dispersion coefficient of 0.013， and the characteristic value at a shore hardness of 80 D presented the best curing evaluation index for the complete curing of adhesives.

Key words: retard?bonded prestressed technology, adhesive, shore hardness, tensile shear strength, compressive strength, bending strength, curing index

CLC Number:

TQ320.79

JIANG Fangxin, LI Xianhua, TIAN Qingtao, WANG Limin, LI Peixun, DU Jiangtao. Experimental study on curing index of adhesives for retard⁃bonded prestressed steel strand[J]. China Plastics, 2024, 38(5): 94-99.

Figures/Tables 10

References 18

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胶黏剂类型	25 ℃固化期/d	样品编号	初始锥入度/0.1 mm	pH值	固含量质量分数/%	密度/kg∙m^-3
SA	360±36	SA⁃1	300.3	7.6	99.6	1.57×10³
		SA⁃2	296.6	7.6	99.8
		SA⁃3	301.5	7.8	99.5
SB	540±60	SB⁃1	251.9	7.6	99.8	1.55×10³
		SB⁃2	295.5	7.8	99.6
		SB⁃3	307.8	7.8	99.8
SC	720±80	SC⁃1	337.7	7.8	99.5	1.53×10³
		SC⁃2	332.6	7.9	99.6
		SC⁃3	326.8	7.9	99.8

胶黏剂类型	25 ℃固化期/d	样品编号	初始锥入度/0.1 mm	pH值	固含量质量分数/%	密度/kg∙m^-3
SA	360±36	SA⁃1	300.3	7.6	99.6	1.57×10³
		SA⁃2	296.6	7.6	99.8
		SA⁃3	301.5	7.8	99.5
SB	540±60	SB⁃1	251.9	7.6	99.8	1.55×10³
		SB⁃2	295.5	7.8	99.6
		SB⁃3	307.8	7.8	99.8
SC	720±80	SC⁃1	337.7	7.8	99.5	1.53×10³
		SC⁃2	332.6	7.9	99.6
		SC⁃3	326.8	7.9	99.8

试样类型	试样制备及测试依据	每个编号试样数量/个	试验仪器
锥入度样品	ISO2137⁃1985	15	润滑脂和石油脂锥入度测定仪
邵氏硬度样品	ISO4587：2003	15	邵氏硬度计
拉伸剪切强度样品	ISO7619⁃1：2004	15	电子万能试验机
弯曲/抗压强度样品	ISO679：1989	9	微机电液伺服压力试验机
SA样品	—	—	SEM）

试样类型	试样制备及测试依据	每个编号试样数量/个	试验仪器
锥入度样品	ISO2137⁃1985	15	润滑脂和石油脂锥入度测定仪
邵氏硬度样品	ISO4587：2003	15	邵氏硬度计
拉伸剪切强度样品	ISO7619⁃1：2004	15	电子万能试验机
弯曲/抗压强度样品	ISO679：1989	9	微机电液伺服压力试验机
SA样品	—	—	SEM）

胶黏剂类型	固化期/d	最大邵氏硬度/D	最大拉伸剪切强度/MPa	最大抗压强度/MPa	最大弯曲强度/MPa
SA	200±20	86.18	15.14	93.65	30.46
		88.23	17.22	80.69	24.37
		88.01	13.12	75.31	22.92
SB	290±36	85.23	14.05	95.82	25.63
		87.19	20.11	81.59	23.96
		88.17	13.17	70.38	22.32
SC	380±50	86.03	12.01	89.12	28.56
		87.08	17.24	75.31	26.98
		89.14	15.13	67.11	25.65
离散系数	—	0.013	0.158	0.118	0.098