混凝土与水泥制品
混凝土與水泥製品
혼응토여수니제품
CHINA CONCRETE AND CEMENT PRODUCTS
2015年
1期
27-32
,共6页
超缓凝混凝土%砂率%水灰比%凝结时间
超緩凝混凝土%砂率%水灰比%凝結時間
초완응혼응토%사솔%수회비%응결시간
Super-retarding concrete%Sand ratio%Water-cement ratio%Setting time
超缓凝混凝土是一种凝结时间较长、早期强度较低、后期强度发展较快的新型混凝土。本文探讨了水灰比、砂率、矿物掺合料掺量对超缓凝混凝土性能的影响，以水灰比、砂率、矿物掺合料掺量为单一变量，利用聚羧酸和蔗糖为减水剂和缓凝剂，分别测定了混凝土流动性能、凝结性能及抗压强度。结果表明，超缓凝混凝土的砂率宜选择35%~45%；水灰比在0.30~0.80范围，混凝土28d抗压强度随水灰比增加而降低，凝结时间随水灰比增加而增加；粉煤灰和矿粉的掺入可以改善超缓凝混凝土的工作性能，超缓凝混凝土后期强度随粉煤灰或矿粉取代量增加而降低。
超緩凝混凝土是一種凝結時間較長、早期彊度較低、後期彊度髮展較快的新型混凝土。本文探討瞭水灰比、砂率、礦物摻閤料摻量對超緩凝混凝土性能的影響，以水灰比、砂率、礦物摻閤料摻量為單一變量，利用聚羧痠和蔗糖為減水劑和緩凝劑，分彆測定瞭混凝土流動性能、凝結性能及抗壓彊度。結果錶明，超緩凝混凝土的砂率宜選擇35%~45%；水灰比在0.30~0.80範圍，混凝土28d抗壓彊度隨水灰比增加而降低，凝結時間隨水灰比增加而增加；粉煤灰和礦粉的摻入可以改善超緩凝混凝土的工作性能，超緩凝混凝土後期彊度隨粉煤灰或礦粉取代量增加而降低。
초완응혼응토시일충응결시간교장、조기강도교저、후기강도발전교쾌적신형혼응토。본문탐토료수회비、사솔、광물참합료참량대초완응혼응토성능적영향，이수회비、사솔、광물참합료참량위단일변량，이용취최산화자당위감수제화완응제，분별측정료혼응토류동성능、응결성능급항압강도。결과표명，초완응혼응토적사솔의선택35%~45%；수회비재0.30~0.80범위，혼응토28d항압강도수수회비증가이강저，응결시간수수회비증가이증가；분매회화광분적참입가이개선초완응혼응토적공작성능，초완응혼응토후기강도수분매회혹광분취대량증가이강저。
Super-retarding concrete is a new concrete, which has longer setting time, lower early strength, later strength rapid development. The effects of water-cement ratio, sand ratio, mineral admixture content on the property of the super-retarding concrete are discussed in this paper, using water-cement ratio, sand ratio, mineral admixture content as the single variable, using polycarboxylic acid and sucrose as the water reducer and setting retarder, the flow properties, coagulation properties and compressive strength of concrete are determined. The results show that sand ratio of super-re-tarding concrete should be 35%~45%, water-cement ratio in the range of 0.3~0.8, 28d compressive strength of the con-crete decrease with water-cement ratio increasing, the setting time increase with water-cement ratio increasing, fly ash and slag can improve the workability of super-retarding concrete, the later strength of super-retarding concrete decrease with the substituted amount of fly ash or slag increasing.
