预填集料高强混凝土抗压强度影响因素研究

当前工程应用的预填集料混凝土其集料粒径大且组成单一,混凝土强度偏低,应用范围受限.为提高预填集料混凝土抗压强度,本文试验研究制备方式、浆体材料类型、粗集料级配组成等对预填集料混凝土抗压强度的影响.结果表明:分层填筑、振动灌浆比自填充灌浆更有利于提高预填集料混凝土抗压强度;粗集料堆积程度越紧密、空隙率越小,预填集料混凝土...

Influencing Factors of Compressive Strength of Preplaced Aggregated High Strength Concrete

The PAC used in the current project has large aggregate size and single composition, and concrete strength is low. Therefore, the engineering application of PAC is limited. In order to improve the compressive strength of prefilled aggregate concrete, the effects of preparation method, slurry material type and coarse aggregate gradation composition on the compressive strength of prefilled aggregate concrete were studied. The results show that vibration grouting and layered grouting contribute more to the strength of concrete than self-filling grouting. The closer the coarse aggregate accumulation degree is, the smaller the voidage is, and the higher the compressive strength of preplaced aggregate concrete is. The strength of PAC made with high fluidity mortar is higher than that made with clean slurry. Using discontinuous graded coarse aggregate (10 ~ 20 mm∶20 ~ 25 mm= 2∶8, voidage 37%) and high-strength and high-fluidity mortar (330 mm expansion, 28 d compressive strength of 72.2 MPa), the preplaced aggregate high-strength concrete with 28 d compressive strength of 69.4 MPa can be prepared by single vibration molding.