Equivalent maintenance mode and characteristics of the early strength of grouting material - Superfine grouting material usage

grouting material using method grouting material used for the size of grouting material model through in recent years earlier grouting material test and the engineering application practice, the experience of mass early strength greater difference between grouting material mixture ratio test and engineering practice. Common early strength grouting material is relatively close, try to match and the engineering actual situation and the big volume early strength of grouting material to try match due to the small size of specimen, not well on behalf of the early strength grouting material hydration exothermic situation of engineering structure entity; The development of the solid strength of large volume early strength of grouting material is under the condition of high temperature, high humidity, and the intensity of big volume early strength of grouting material try match is produced in standard curing condition. According to the massive construction of the early strength of grouting material test, the general 3 d before the hydration heat release quantity accounted for about 50% of the total quantity of heat, 3 ~ 5 d secondary grouting materials early strength grouting materials center temperature can reach the highest peak. Therefore, 28 d entities large volume early strength of grouting material temperature change trend of smooth, strength development tend to be stable.               Therefore, marking a 28 d the match strength does not represent a real big volume early strength the strength of the grouting material, only for reference. Large volume early strength of grouting material with timing, competition should be based on early strength grouting engineering structure in thickness and early strength of grouting material strength grade is different, extend standard curing age, or by high curing ages ( ℃ d） Design, that is, according to the different of the early strength of grouting material level, the early strength grouting material thickness, the highest temperature is expected early strength grouting material center to determine the early strength grouting material with a race with age, each 1 m & sup3; Early strength of grouting material minimum total dosage of cement or cement materials.             Building materials summarizing the experiment, put forward the early strength of grouting material equivalent curing experience reference index early strength of grouting material level & amp; Nb is concrete grouting material sp; Every 1 m & sup3; Early strength of grouting material of cement grouting material thickness is expected as early as the early grouting materials center is the highest temperature of grouting materials try to match or acceptance equivalent curing age entity early strength grouting material structure to meet the design strength (dC20 C30160 ~ ~ 2001 ~ 235 ~ 4528600 ~ 80020 c30 ~ C40200 ~ 2202 ~ 345 ~ 55421000 ~ 120024 c40 ~ C50220 ~ 2603 ~ 455 ~ 65601200 ~ 180028 c50 above 260 ~ 3004 above 64 ~ 75901800 ~ 200032 & # 8195;           Note: 1, the early strength grouting material, the higher the grade, per cubic metre of high early strength cement grouting material usage will accordingly, early strength grouting material center temperature and the hydration heat will also increase, also should improve cooperation with the competition to raise ( Or acceptance) Age.             2, early strength, the thicker the grouting material, early strength grouting material center relative is the highest temperature is higher, also should improve cooperation with competition ( Or acceptance of h40 grouting material ratio) Age.             Large volume early strength of grouting material for underground raft foundation, hydration heat emission concentration, early strength grouting material for high temperature in the center, there is biggish difference with normal early strength grouting material mixture ratio. In the design of mix proportion, therefore, should be in accordance with the requirements of early strength grouting material durability, reduce the dosage of cement, improve the dosage of admixture, extend standard curing age is 56 d and 90 d, also can use the equivalent curing for adaptation.