文档介绍：“第一届混凝土耐久性测试技术及实验室建设”学术交流会
北京
2011 年
自密实混凝土工作性评价方法与两个主要的技术指标
黄智山
1,2
杜卓铮
2
摘要:本文根据Ⅰ类碎石、Ⅱ类碎石、强度等级,划分为“5-31”和“5-3-1”两种类型,“5-3”是核心性能;
SCC工作性不划分等级,由三根螺纹钢组成的、钢筋最大净间距 41mm保持不变的强化型L的评价指标
测方法苛刻、测试点明确、量化清晰,工作性的综合检验指标;新增了泌水检测项目;将
.8
a,t
=0
视为评价方法中两个主要的技术指标,研制进程;提出了稳定流动、浇筑工作性、假性离析、水粉比
的概念,工作性具有高敏感特性,给出了模型化表征;对给定的原材料,,其工作性通
常是唯一的或在极为狭窄的区域内变化,都应是相对独立的研究工作;工作性评价
技术指标的参数范围,并以浇筑工作性作为检测验收的依据,它适用于Ⅰ类碎石、Ⅱ类碎石配制的“5-3-1”型与“5-31”
。
关键词:自密实混凝土强化型L-仪泌水浇筑工作性假性离析水粉比高敏感特性精细化
Evaluation methods for workability of paction
Concrete and two key parameters
Huang Zhishan1,2
Du Zhuozheng2
(School of civil engineering, School of material science, Harbin institute of technology, 150006)
Abstract: paction concrete (SCC) was classified into two types of 5-31 and 5-3-1 in this paper according to grade
Ⅰ crushing stone, grade Ⅱ crushing stone and strength grade. “5-3” is the key performance and there is no classification
for workability of SCC. One type of improved L shape device was developed by using three deformed steel bars, with the
distance of 41 mm between every two bars, and the evaluation parameter was h中2, t / h1 2,t > for SCC workability.
This is prehensive evaluation parameter for SCC workability, with characteristics of strict experiment, accurate test
result and clear quantization. Bleeding test is also included in this method,
h中2, t / h1 2,t >
and B a,t =0 are two important
technical parameters. Therefore, the development period of SCC can be reduced. Concepts of stable flowability, casting
workability, pseudo segregation and water to powder ratio were advanced. SCC workability is thought highly sensitive and it
is characterized by one type of model. For different strength grades of SCC prepared with the same raw materials, their
workability are normally the same value or changes within a very narrow range, so independent research should be done for
every strength grade of SCC. The parameter scopes are found for evalu