Development of a fast-hardening retarding high-early-strength concrete with low-alkalinity sulphoaluminate cement and practical application

Abstract

To widen bridges, a usual method is to cast joint connections between new and old bridge decks without traffic interruption. The traffic vibrations have negative influence on the quality of joint connections. Shortening the construction time can alleviate the impact on the traffics, a fast-hardening retarding high-early-strength concrete (FRHC) for the connections is in need. In this study, low-alkalinity sulphoaluminate cement (LASC) concrete was modified to gain these characteristics. Based on FRHC concrete, four slab specimens including a monolithic concrete slab and three joint FRHC slabs were cast to investigate their flexural behaviors. With proper splicing details in joint connections, the joint FRHC specimens behaved approximately similar to the monolithic specimen. Combing the laboratory tests and engineering practice, the newly developed FRHC mixture succeeded in fast-hardening, retarding and high-early strength and the joint connections filled with FRHC have a good flexural performance.

The Effect of Low-Modulus Plastic Fiber on the Physical and Technical Characteristics of Modified Heavy Concretes Based on Polycarboxylates and Microsilica

“…In global practice, the production of high-strength quick-hardening concretes is increasing, which allows the development of structural elements and technologies, significantly expanding the assortment of concrete products and structures [ 1 , 2 ]. From the analysis of the literature [ 3 , 4 ] on this subject, it follows that little attention is paid to the issue of reducing the proportion of cement in the composition of concrete.…”

“…Effective heavy concretes of various functional purposes with improved building and operating properties are produced using multicomponent compositions [ 11 ]. The creation of such concretes is based on the principle of purposeful management of technology at all of its stages: the use of active components [ 1 ]; the development of optimal compositions [ 12 ]; the use of chemical modifiers; and reducing macroporosity and increasing cracking resistance by strengthening the contact zones of the cement stone and coarse aggregate [ 13 ]. Previously published papers [ 14 ] show that with the introduction of ultradispersed silica waste to the quick-hardening concrete, in combination with a hyperplasticizer, it is possible to obtain concrete with strength of up to 100 MPa after 1 day of normal curing, and with the use of hardening accelerators up to 20 MPa after 4 h and 130 MPa after 7 days of curing.…”