Experimental Study on Modification of Grouting Material for Joints of Prefabricated Buildings

IF 3.6 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-02-19 DOI:10.1186/s40069-023-00649-6

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Abstract

In order to apply grouting material to the joints of fabricated buildings and make it meet the performance demands of low shrinkage, strong bond, and high toughness of joint materials for prefabricated buildings, the expansion agent (EA), neoprene latex (NL), and rubber particles (RP) were used to modify the grouting material, and the effects of different dosages of the three components on the working performance, mechanical properties, and expansion or shrinkage properties of the grouting material were investigated. The results show that the EA decreases the flexural strength-to-compressive strength ratio (FCR) of the grouting material and enhances the vertical expansion rate and bond strength. The dosage of EA and the curing conditions have a significant effect on the expansion rate of the hardened grouting material. The grouting material can still maintain its 0.0022% free expansion rate with a 7% EA dosage at 120 d. The NL significantly inhibits the vertical expansion of the fresh mortar but inhibits the drying shrinkage of the grouting material after hardening, improves the FCR and bond strength; the 7 d bond strength under a 5% NL dosage can reach 4.27 MPa. The RP inhibits the vertical expansion of the fresh mortar and the drying shrinkage after mortar hardening; with the increase of its dosage, the bond strength of the grouting material increases first and then decreases, the 28 d FCS of the grouting material peaked at 0.173 at 10% dosage.

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预制建筑接缝灌浆材料改性实验研究

摘要为了将灌浆材料应用于预制建筑的接缝处，使其满足预制建筑接缝材料低收缩、强粘结、高韧性的性能要求，采用膨胀剂（EA）、氯丁橡胶胶乳（NL）和橡胶颗粒（RP）对灌浆材料进行改性，并研究了三种成分的不同用量对灌浆材料的工作性能、力学性能和膨胀或收缩性能的影响。结果表明，EA 降低了灌浆材料的抗弯强度与抗压强度比（FCR），提高了垂直膨胀率和粘结强度。EA 的用量和固化条件对硬化灌浆材料的膨胀率有显著影响。NL 能显著抑制新鲜砂浆的垂直膨胀，但能抑制硬化后灌浆材料的干燥收缩，提高 FCR 和粘结强度；5% NL 用量下 7 d 的粘结强度可达 4.27 MPa。RP 可抑制新拌砂浆的垂直膨胀和砂浆硬化后的干燥收缩；随着其掺量的增加，灌浆材料的粘结强度先增大后减小，在掺量为 10%时，灌浆材料 28 d 的 FCS 达到峰值 0.173。

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来源期刊

International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

6.30

自引率

5.90%

发文量

审稿时长

13 weeks

期刊介绍： The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.