Experimental Study On C40 Precast Concrete Early Strength Agent

Prefabricated concrete structure is hot. But the precast concrete early strength is low, resulting in mold turnover rate is not high, affecting production efficiency and economic benefits, restrict the practical application of precast concrete. In such circumstances, strong research precast concrete early strength of technology, especially the study of precast concrete early strength agent, can improve the efficiency of industrial construction, greatly reducing the energy consumption of the process of industrialization, for the establishment of a harmonious society is of great significance.During the study of raw materials adequate screening and analysis of each material in addition to the best content is preferably also determined to play the role of the best matching content. Also pay special attention to the problem of compatibility tests of each single early strength materials and cement, and the incorporation of concrete impact on its durability. In addition to strictly control the test conditions and standards, making it comparable scientific test results to ensure that research is accurate, true and credible.In order to meet the concrete’s good workability, high early strength, no retraction late strength, good durability requirements, according to the early strength after a single state of C40 concrete mixture and hardened 1d,3d,7d,28d,56d and 84d compressive strength data, select the best four single integrated early strength agent, which combined into the HD composite precast concrete early strength agent, give full play to their respective characteristics and superimposed effect, in order to meet project requirements. Through a large number of orthogonal experiment and its methods of data processing, the HD compound early strength agent component to study the complex ratio was four single choice early strength agent. By adding this compound in the early strength of the concrete to produce a series of concrete specimens, with the reference concrete specimens were verified by comparing adding the HD compound early strength of C40 precast concrete to meet precast concrete indicators.